pcb_io_pads.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2025 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */
 
#include "pcb_io_pads.h"
#include "pads_layer_mapper.h"
 
#include <algorithm>
#include <climits>
#include <cmath>
#include <fstream>
#include <functional>
 
#include <board.h>
#include <pcb_track.h>
#include <pcb_text.h>
#include <footprint.h>
#include <zone.h>
 
#include "pads_parser.h"
#include <io/pads/pads_unit_converter.h>
#include <io/pads/pads_common.h>
 
#include <netinfo.h>
#include <wx/log.h>
#include <wx/file.h>
#include <wx/filename.h>
#include <core/mirror.h>
#include <pad.h>
#include <pcb_shape.h>
#include <pcb_dimension.h>
#include <board_design_settings.h>
#include <project/net_settings.h>
#include <board_stackup_manager/board_stackup.h>
#include <netclass.h>
#include <geometry/eda_angle.h>
#include <geometry/shape_arc.h>
#include <pcb_group.h>
#include <string_utils.h>
#include <progress_reporter.h>
#include <reporter.h>
#include <advanced_config.h>
#include <locale_io.h>
 
PCB_IO_PADS::PCB_IO_PADS() : PCB_IO( "PADS ASCII" )
{
    LAYER_MAPPABLE_PLUGIN::RegisterCallback(
            std::bind( &PCB_IO_PADS::DefaultLayerMappingCallback, this, std::placeholders::_1 ) );
}
 
 
PCB_IO_PADS::~PCB_IO_PADS()
{
}
 
 
const IO_BASE::IO_FILE_DESC PCB_IO_PADS::GetBoardFileDesc() const
{
    IO_FILE_DESC desc;
    desc.m_FileExtensions.push_back( "asc" );
    desc.m_Description = "PADS ASCII";
    return desc;
}
 
 
const IO_BASE::IO_FILE_DESC PCB_IO_PADS::GetLibraryDesc() const
{
    // PADS ASCII doesn't really support libraries in the KiCad sense,
    // but we must implement this.
    return IO_FILE_DESC( "PADS ASCII Library", { "asc" } );
}
 
 
long long PCB_IO_PADS::GetLibraryTimestamp( const wxString& aLibraryPath ) const
{
    return 0;
}
 
 
bool PCB_IO_PADS::CanReadBoard( const wxString& aFileName ) const
{
    if( !PCB_IO::CanReadBoard( aFileName ) )
        return false;
 
    std::ifstream file( aFileName.fn_str() );
 
    if( !file.is_open() )
        return false;
 
    std::string line;
 
    if( std::getline( file, line ) )
    {
        if( line.find( "!PADS-" ) != std::string::npos )
            return true;
    }
 
    return false;
}
 
 
BOARD* PCB_IO_PADS::LoadBoard( const wxString& aFileName, BOARD* aAppendToMe,
                               const std::map<std::string, UTF8>* aProperties, PROJECT* aProject )
{
    LOCALE_IO setlocale;
 
    std::unique_ptr<BOARD> board( aAppendToMe ? aAppendToMe : new BOARD() );
 
    if( m_reporter )
        m_reporter->Report( _( "Starting PADS PCB import" ), RPT_SEVERITY_INFO );
 
    if( m_progressReporter )
        m_progressReporter->SetNumPhases( 4 );
 
    PADS_IO::PARSER parser;
 
    try
    {
        parser.Parse( aFileName );
    }
    catch( const std::exception& e )
    {
        THROW_IO_ERROR( wxString::Format( "Error parsing PADS file: %s", e.what() ) );
    }
 
    m_loadBoard = board.get();
    m_parser = &parser;
    m_testPointIndex = 1;
    m_minObjectSize = ADVANCED_CFG::GetCfg().m_PcbImportMinObjectSizeNm;
 
    try
    {
        if( m_progressReporter )
            m_progressReporter->BeginPhase( 1 );
 
        loadBoardSetup();
        loadNets();
 
        if( m_progressReporter )
            m_progressReporter->BeginPhase( 2 );
 
        loadFootprints();
        loadReuseBlockGroups();
        loadTestPoints();
        loadTexts();
 
        if( m_progressReporter )
            m_progressReporter->BeginPhase( 3 );
 
        loadTracksAndVias();
        loadCopperShapes();
        loadClusterGroups();
        loadZones();
        loadBoardOutline();
        loadDimensions();
        loadKeepouts();
        loadGraphicLines();
        generateDrcRules( aFileName );
        reportStatistics();
    }
    catch( ... )
    {
        clearLoadingState();
        throw;
    }
 
    clearLoadingState();
    return board.release();
}
 
 
void PCB_IO_PADS::loadNets()
{
    const auto& nets = m_parser->GetNets();
 
    for( const auto& pads_net : nets )
        ensureNet( pads_net.name );
 
    for( const auto& pads_net : nets )
    {
        for( const auto& pin : pads_net.pins )
        {
            std::string key = pin.ref_des + "." + pin.pin_name;
            m_pinToNetMap[key] = pads_net.name;
        }
    }
 
    const auto& route_nets = m_parser->GetRoutes();
 
    for( const auto& route : route_nets )
    {
        for( const auto& pin : route.pins )
        {
            std::string key = pin.ref_des + "." + pin.pin_name;
 
            if( m_pinToNetMap.find( key ) == m_pinToNetMap.end() )
                m_pinToNetMap[key] = route.net_name;
        }
    }
 
    for( const auto& route : route_nets )
        ensureNet( route.net_name );
 
    for( const auto& pour_def : m_parser->GetPours() )
        ensureNet( pour_def.net_name );
 
    for( const auto& copper : m_parser->GetCopperShapes() )
    {
        if( !copper.net_name.empty() && IsCopperLayer( getMappedLayer( copper.layer ) ) )
            ensureNet( copper.net_name );
    }
 
    const auto& reuse_blocks = m_parser->GetReuseBlocks();
 
    for( const auto& [blockName, block] : reuse_blocks )
    {
        for( const std::string& partName : block.part_names )
        {
            m_partToBlockMap[partName] = blockName;
        }
    }
}
 
 
void PCB_IO_PADS::loadFootprints()
{
    const auto& decals = m_parser->GetPartDecals();
    const auto& part_types = m_parser->GetPartTypes();
    const auto& partInstanceAttrs = m_parser->GetPartInstanceAttrs();
    const auto& parts = m_parser->GetParts();
 
    for( const auto& pads_part : parts )
    {
        FOOTPRINT* footprint = new FOOTPRINT( m_loadBoard );
        footprint->SetReference( pads_part.name );
 
        // Generate deterministic UUID for cross-probe linking between schematic and PCB.
        // The schematic importer uses the same algorithm, enabling selection sync.
        KIID symbolUuid = PADS_COMMON::GenerateDeterministicUuid( pads_part.name );
        KIID_PATH path;
        path.push_back( symbolUuid );
        footprint->SetPath( path );
 
        // Resolve Decal Name
        std::string decal_name = pads_part.decal;
 
        // Always resolve through part types to get the full alternate decal
        // list. A name like "MTHOLE" can be both a decal and a part type, and
        // the part type entry carries the colon-separated alternate list that
        // alt_decal_index indexes into.
        if( !pads_part.explicit_decal )
        {
            auto part_type_it = part_types.find( decal_name );
 
            if( part_type_it != part_types.end() )
                decal_name = part_type_it->second.decal_name;
        }
 
        // Handle Alternate Decals (separated by :)
        // The part's alt_decal_index specifies which alternate to use (0-based).
        std::stringstream ss( decal_name );
        std::string segment;
        std::vector<std::string> decal_list;
 
        while( std::getline( ss, segment, ':' ) )
        {
            decal_list.push_back( segment );
        }
 
        std::string actual_decal_name;
        bool found_valid_decal = false;
 
        if( pads_part.alt_decal_index >= 0
            && static_cast<size_t>( pads_part.alt_decal_index ) < decal_list.size() )
        {
            const std::string& alt_decal = decal_list[pads_part.alt_decal_index];
 
            if( decals.find( alt_decal ) != decals.end() )
            {
                actual_decal_name = alt_decal;
                found_valid_decal = true;
            }
        }
 
        if( !found_valid_decal )
        {
            for( const std::string& decal : decal_list )
            {
                if( decals.find( decal ) != decals.end() )
                {
                    actual_decal_name = decal;
                    found_valid_decal = true;
                    break;
                }
            }
        }
 
        if( found_valid_decal )
        {
            decal_name = actual_decal_name;
        }
 
        LIB_ID fpid;
        fpid.SetLibItemName( wxString::FromUTF8( decal_name ) );
        footprint->SetFPID( fpid );
 
        footprint->SetValue( pads_part.decal );
 
        if( !pads_part.alternate_decals.empty() )
        {
            wxString alternates;
 
            for( size_t i = 0; i < pads_part.alternate_decals.size(); ++i )
            {
                if( i > 0 )
                    alternates += wxT( ", " );
 
                alternates += wxString::FromUTF8( pads_part.alternate_decals[i] );
            }
 
            PCB_FIELD* field = new PCB_FIELD( footprint, FIELD_T::USER, wxT( "PADS_Alternate_Decals" ) );
            field->SetLayer( Cmts_User );
            field->SetVisible( false );
            field->SetText( alternates );
            footprint->Add( field );
        }
 
        auto partCoordScaler = [&]( double val, bool is_x ) {
            double origin = is_x ? m_originX : m_originY;
 
            double part_factor = m_scaleFactor;
 
            if( !m_parser->IsBasicUnits() )
            {
                if( pads_part.units == "M" ) part_factor = PADS_UNIT_CONVERTER::MILS_TO_NM;
                else if( pads_part.units == "MM" ) part_factor = PADS_UNIT_CONVERTER::MM_TO_NM;
                else if( pads_part.units == "I" ) part_factor = PADS_UNIT_CONVERTER::INCHES_TO_NM;
                else if( pads_part.units == "D" ) part_factor = PADS_UNIT_CONVERTER::MILS_TO_NM;
            }
 
            long long origin_nm = static_cast<long long>( std::round( origin * m_scaleFactor ) );
            long long val_nm = static_cast<long long>( std::round( val * part_factor ) );
 
            long long res_nm = val_nm - origin_nm;
 
            if( !is_x )
                res_nm = -res_nm;
 
            return static_cast<int>( std::clamp<long long>( res_nm, INT_MIN, INT_MAX ) );
        };
 
        footprint->SetPosition( VECTOR2I( partCoordScaler( pads_part.location.x, true ),
                                           partCoordScaler( pads_part.location.y, false ) ) );
 
        // Both PADS and KiCad use counter-clockwise positive rotation convention.
        // The Y-axis flip (PADS Y-up vs KiCad Y-down) does not affect rotation direction,
        // so we use the PADS rotation value directly for both top and bottom layer parts.
        // For bottom-layer parts, the subsequent Flip() call handles the layer change and
        // adjusts the orientation appropriately.
        footprint->SetOrientation( EDA_ANGLE( pads_part.rotation, DEGREES_T ) );
 
        footprint->SetLayer( F_Cu );
 
        // Look up custom attribute values from part type and per-instance overrides.
        // Per-instance attributes (from PART <refdes> {...} in *PARTTYPE*) take priority.
        const PADS_IO::PART_TYPE* partType = nullptr;
        auto ptIt = part_types.find( pads_part.decal );
 
        if( ptIt != part_types.end() )
            partType = &ptIt->second;
 
        const std::map<std::string, std::string>* instanceAttrs = nullptr;
        auto iaIt = partInstanceAttrs.find( pads_part.name );
 
        if( iaIt != partInstanceAttrs.end() )
            instanceAttrs = &iaIt->second;
 
        auto applyAttributes = [&]( const std::vector<PADS_IO::ATTRIBUTE>& attrs,
                                    std::function<int(double)> scaler )
        {
            for( const auto& attr : attrs )
            {
                PCB_FIELD* field = nullptr;
                bool ownsField = false;
 
                if( attr.name == "Ref.Des." )
                {
                    field = &footprint->Reference();
                }
                else if( attr.name == "Part Type" || attr.name == "VALUE" )
                {
                    field = &footprint->Value();
                }
                else
                {
                    std::string attrValue;
 
                    if( instanceAttrs )
                    {
                        auto valIt = instanceAttrs->find( attr.name );
 
                        if( valIt != instanceAttrs->end() )
                            attrValue = valIt->second;
                    }
 
                    if( attrValue.empty() && partType )
                    {
                        auto valIt = partType->attributes.find( attr.name );
 
                        if( valIt != partType->attributes.end() )
                            attrValue = valIt->second;
                    }
 
                    if( !attrValue.empty() )
                    {
                        field = new PCB_FIELD( footprint, FIELD_T::USER,
                                               wxString::FromUTF8( attr.name ) );
                        field->SetText( wxString::FromUTF8( attrValue ) );
 
                        // Footprint text fields on copper layers are almost always documentation
                        // labels. Redirect to the corresponding silkscreen layer.
                        PCB_LAYER_ID fieldLayer = getMappedLayer( attr.level );
 
                        if( fieldLayer == UNDEFINED_LAYER )
                            fieldLayer = Cmts_User;
                        else if( IsCopperLayer( fieldLayer ) )
                            fieldLayer = IsBackLayer( fieldLayer ) ? B_SilkS : F_SilkS;
 
                        field->SetLayer( fieldLayer );
                        ownsField = true;
                    }
                }
 
                if( !field )
                    continue;
 
                int scaledSize = scaler( attr.height );
                int charHeight =
                        static_cast<int>( scaledSize * ADVANCED_CFG::GetCfg().m_PadsPcbTextHeightScale );
                int charWidth =
                        static_cast<int>( scaledSize * ADVANCED_CFG::GetCfg().m_PadsPcbTextWidthScale );
                field->SetTextSize( VECTOR2I( charWidth, charHeight ) );
 
                if( attr.width > 0 )
                    field->SetTextThickness( scaler( attr.width ) );
 
                // Position is relative to part origin, rotated by part orientation.
                // Y is negated for coordinate system conversion.
                VECTOR2I offset( scaler( attr.x ), -scaler( attr.y ) );
                EDA_ANGLE part_orient( pads_part.rotation, DEGREES_T );
                RotatePoint( offset, part_orient );
 
                // PADS text anchor differs from KiCad by a small offset along the
                // reading direction. Shift left (toward text start) to compensate.
                EDA_ANGLE textAngle = EDA_ANGLE( attr.orientation, DEGREES_T ) + part_orient;
                VECTOR2I textShift( -ADVANCED_CFG::GetCfg().m_PadsTextAnchorOffsetNm, 0 );
                RotatePoint( textShift, textAngle );
                offset += textShift;
 
                field->SetPosition( footprint->GetPosition() + offset );
                field->SetTextAngle( textAngle );
                field->SetKeepUpright( false );
                field->SetVisible( attr.visible );
 
                if( attr.hjust == "LEFT" )
                    field->SetHorizJustify( GR_TEXT_H_ALIGN_LEFT );
                else if( attr.hjust == "RIGHT" )
                    field->SetHorizJustify( GR_TEXT_H_ALIGN_RIGHT );
                else
                    field->SetHorizJustify( GR_TEXT_H_ALIGN_CENTER );
 
                if( attr.vjust == "UP" )
                    field->SetVertJustify( GR_TEXT_V_ALIGN_BOTTOM );
                else if( attr.vjust == "DOWN" )
                    field->SetVertJustify( GR_TEXT_V_ALIGN_TOP );
                else
                    field->SetVertJustify( GR_TEXT_V_ALIGN_CENTER );
 
                if( ownsField )
                    footprint->Add( field );
            }
        };
 
        auto decal_it = decals.find( decal_name );
 
        double decalScale = ( decal_it != decals.end() )
                                    ? decalUnitScale( decal_it->second.units )
                                    : 0.0;
 
        auto decalScaler = [&, decalScale]( double val ) {
            return decalScale > 0.0 ? KiROUND( val * decalScale ) : scaleSize( val );
        };
 
        if( decal_it != decals.end() )
            applyAttributes( decal_it->second.attributes, decalScaler );
        else
        {
             if( m_reporter )
             {
                 m_reporter->Report(
                         wxString::Format( _( "Footprint '%s' not found in decal list, part skipped" ),
                                           decal_name ),
                         RPT_SEVERITY_WARNING );
             }
        }
 
        auto partScaler = [&]( double val ) {
            if( !m_parser->IsBasicUnits() )
            {
                if( pads_part.units == "M" ) return KiROUND( val * PADS_UNIT_CONVERTER::MILS_TO_NM );
            }
 
            if( pads_part.units == "M" ) return KiROUND( val );
 
            return scaleSize( val );
        };
 
        applyAttributes( pads_part.attributes, partScaler );
 
        // PADS "Part Type" maps to KiCad Value field. Hide it since it typically
        // shows the part type name which is not useful on fabrication layers.
        footprint->Value().SetVisible( false );
 
        m_loadBoard->Add( footprint );
 
        auto blockIt = m_partToBlockMap.find( pads_part.name );
 
        if( blockIt != m_partToBlockMap.end() )
        {
            PCB_FIELD* blockField =
                    new PCB_FIELD( footprint, FIELD_T::USER, wxT( "PADS_Reuse_Block" ) );
            blockField->SetLayer( Cmts_User );
            blockField->SetVisible( false );
            blockField->SetText( wxString::FromUTF8( blockIt->second ) );
            footprint->Add( blockField );
        }
 
        if( decal_it == decals.end() )
        {
            continue;
        }
 
        // Add Pads and Graphics from Decal
        {
            const PADS_IO::PART_DECAL& decal = decal_it->second;
 
            auto convertPadShape = [&]( const PADS_IO::PAD_STACK_LAYER& layer_def,
                                        PAD* pad, PCB_LAYER_ID kicad_layer,
                                        const EDA_ANGLE& part_orient ) {
                const std::string& shape = layer_def.shape;
                // In PADS, sizeA is height (Y) and sizeB is width (X), opposite of KiCad convention
                VECTOR2I size( std::max( decalScaler( layer_def.sizeB ), m_minObjectSize ),
                               std::max( decalScaler( layer_def.sizeA ), m_minObjectSize ) );
 
                if( shape == "R" || shape == "C" || shape == "A" || shape == "RT" )
                {
                    pad->SetShape( kicad_layer, PAD_SHAPE::CIRCLE );
                    pad->SetSize( kicad_layer, VECTOR2I( size.x, size.x ) );
                }
                else if( shape == "S" || shape == "ST" )
                {
                    pad->SetShape( kicad_layer, PAD_SHAPE::RECTANGLE );
                    pad->SetSize( kicad_layer, VECTOR2I( size.x, size.x ) );
                }
                else if( shape == "O" || shape == "OT" )
                {
                    pad->SetShape( kicad_layer, PAD_SHAPE::OVAL );
                    pad->SetSize( kicad_layer, size );
                }
                else if( shape == "RF" )
                {
                    pad->SetShape( kicad_layer, PAD_SHAPE::RECTANGLE );
                    pad->SetSize( kicad_layer, size );
                }
                else if( shape == "OF" )
                {
                    pad->SetShape( kicad_layer, PAD_SHAPE::OVAL );
                    pad->SetSize( kicad_layer, size );
                }
                else if( shape == "RC" || shape == "OC" )
                {
                    pad->SetShape( kicad_layer, PAD_SHAPE::ROUNDRECT );
                    pad->SetSize( kicad_layer, size );
 
                    if( layer_def.corner_radius > 0 && size.x > 0 )
                    {
                        double min_dim = std::min( size.x, size.y );
                        double radius = decalScaler( layer_def.corner_radius );
                        double ratio = ( min_dim > 0 ) ? ( radius / min_dim ) : 0.25;
                        ratio = std::min( ratio, 0.5 );
                        pad->SetRoundRectRadiusRatio( kicad_layer, ratio );
                    }
                    else
                    {
                        pad->SetRoundRectRadiusRatio( kicad_layer, 0.25 );
                    }
                }
                else
                {
                    pad->SetShape( kicad_layer, PAD_SHAPE::CIRCLE );
                    pad->SetSize( kicad_layer, VECTOR2I( size.x, size.x ) );
                }
 
                if( layer_def.finger_offset != 0 )
                {
                    // finger_offset runs along the finger's long axis (pad-local X before
                    // rotation).  PAD::ShapePos() rotates the offset by GetOrientation(), so
                    // store it unrotated; pre-rotating by layer_def.rotation here would
                    // double-apply the rotation.
                    pad->SetOffset( kicad_layer,
                                    VECTOR2I( decalScaler( layer_def.finger_offset ), 0 ) );
                }
 
                pad->SetOrientation( part_orient + EDA_ANGLE( layer_def.rotation, DEGREES_T ) );
            };
 
            EDA_ANGLE part_orient( pads_part.rotation, DEGREES_T );
 
            for( size_t term_idx = 0; term_idx < decal.terminals.size(); ++term_idx )
            {
                const auto& term = decal.terminals[term_idx];
                PAD* pad = new PAD( footprint );
                footprint->Add( pad );
 
                pad->SetNumber( term.name );
 
                VECTOR2I pad_pos( decalScaler( term.x ), -decalScaler( term.y ) );
                RotatePoint( pad_pos, part_orient );
                pad->SetPosition( footprint->GetPosition() + pad_pos );
 
                // Look up pad stack by terminal index (1-based). PAD 0 is the default for
                // terminals without explicit definitions. PAD N is for terminal index N.
                int pin_num = static_cast<int>( term_idx + 1 );
 
                auto stack_it = decal.pad_stacks.find( pin_num );
 
                if( stack_it == decal.pad_stacks.end() )
                    stack_it = decal.pad_stacks.find( 0 );
 
                if( stack_it != decal.pad_stacks.end() && !stack_it->second.empty() )
                {
                    const std::vector<PADS_IO::PAD_STACK_LAYER>& stack = stack_it->second;
 
                    double drill = 0.0;
                    bool plated = true;
                    double slot_length = 0.0;
                    double slot_orientation = 0.0;
                    double pad_rotation = 0.0;
 
                    for( const auto& layer_def : stack )
                    {
                        if( layer_def.drill > 0 )
                        {
                            drill = layer_def.drill;
                            plated = layer_def.plated;
                            slot_length = layer_def.slot_length;
                            slot_orientation = layer_def.slot_orientation;
                            pad_rotation = layer_def.rotation;
                            break;
                        }
                    }
 
                    LSET layer_set;
 
                    auto mapPadsLayer = [&]( int pads_layer ) -> PCB_LAYER_ID {
                        if( pads_layer == -2 || pads_layer == 1 )
                            return F_Cu;
                        else if( pads_layer == -1
                                 || pads_layer == m_parser->GetParameters().layer_count )
                            return B_Cu;
                        else if( pads_layer > 1
                                 && pads_layer < m_parser->GetParameters().layer_count )
                        {
                            int inner_idx = pads_layer - 2;
 
                            if( inner_idx >= 0 && inner_idx < 30 )
                                return static_cast<PCB_LAYER_ID>( In1_Cu + inner_idx * 2 );
                        }
 
                        return UNDEFINED_LAYER;
                    };
 
                    bool has_explicit_layers = false;
 
                    for( const auto& layer_def : stack )
                    {
                        if( layer_def.layer == -2 || layer_def.layer == -1
                            || layer_def.layer == 1
                            || layer_def.layer == m_parser->GetParameters().layer_count )
                        {
                            has_explicit_layers = true;
                            break;
                        }
                    }
 
                    // Track mask/paste layers explicitly present in the stack regardless
                    // of size. A zero-size entry means "intentionally no pad on this layer"
                    // and must suppress the SMD fallback for that layer.
                    LSET explicitly_seen_tech;
 
                    for( const auto& layer_def : stack )
                    {
                        if( layer_def.layer > 0 )
                        {
                            PCB_LAYER_ID check = getMappedLayer( layer_def.layer );
 
                            if( check == F_Mask || check == B_Mask
                                || check == F_Paste || check == B_Paste )
                            {
                                explicitly_seen_tech.set( check );
                            }
                        }
                    }
 
                    // Pre-scan copper layers to detect whether the pad needs
                    // per-layer shapes.  In PADS, layer -2 is top copper and
                    // layer -1 is bottom copper, and they can have different
                    // shapes (e.g. square on top, round on bottom).  KiCad's
                    // PADSTACK in NORMAL mode stores a single shape for all
                    // layers, so we must switch to FRONT_INNER_BACK when the
                    // front and back shapes differ.
                    if( has_explicit_layers )
                    {
                        std::string front_shape;
                        std::string back_shape;
 
                        for( const auto& layer_def : stack )
                        {
                            if( layer_def.sizeA <= 0 )
                                continue;
 
                            if( layer_def.shape == "RT" || layer_def.shape == "ST"
                                || layer_def.shape == "RA" || layer_def.shape == "SA" )
                            {
                                continue;
                            }
 
                            PCB_LAYER_ID mapped = mapPadsLayer( layer_def.layer );
 
                            if( mapped == F_Cu && front_shape.empty() )
                                front_shape = layer_def.shape;
                            else if( mapped == B_Cu && back_shape.empty() )
                                back_shape = layer_def.shape;
                        }
 
                        // Only switch to FRONT_INNER_BACK when the pad shape itself
                        // differs between front and back copper.  Size-only differences
                        // (e.g. different annular ring diameters) are represented in
                        // NORMAL mode using the primary (front/component-side) shape, which
                        // keeps mirrored placements visually consistent with the original.
                        if( !front_shape.empty() && !back_shape.empty()
                            && front_shape != back_shape )
                        {
                            pad->Padstack().SetMode( PADSTACK::MODE::FRONT_INNER_BACK );
                        }
                    }
 
                    // Tracks whether convertPadShape has already been called for a copper
                    // layer in NORMAL mode.  In NORMAL mode all copper layers map to the
                    // same ALL_LAYERS slot, so a second call would overwrite the first.
                    // The primary (layer -2, component-side) entry must win.
                    bool normal_copper_set = false;
 
                    for( const auto& layer_def : stack )
                    {
                        if( layer_def.layer == 0 )
                        {
                            if( !has_explicit_layers )
                            {
                                layer_set = ( drill > 0 ) ? LSET::AllCuMask()
                                                          : LSET( { F_Cu, B_Cu } );
                                convertPadShape( layer_def, pad, F_Cu, part_orient );
 
                                if( drill == 0 )
                                {
                                    pad->SetShape( B_Cu, pad->GetShape( F_Cu ) );
                                    pad->SetSize( B_Cu, pad->GetSize( F_Cu ) );
                                }
                            }
 
                            continue;
                        }
 
                        // Skip layers with size 0 - "no pad on this layer" in PADS.
                        // We must not call SetSize with 0 since in PADSTACK NORMAL mode all
                        // layers write to the same ALL_LAYERS slot, overwriting valid sizes.
                        if( layer_def.sizeA <= 0 )
                            continue;
 
                        // RT/ST are thermal relief spoke patterns for plane layers.
                        // RA/SA are anti-pad (clearance) shapes for plane layers.
                        // KiCad computes thermal reliefs from zone settings, so skip
                        // these to avoid overwriting the actual pad shape.  However,
                        // the presence of RT/ST indicates this pad should have thermal
                        // relief rather than a solid connection to copper pours.
                        if( layer_def.shape == "RT" || layer_def.shape == "ST" )
                        {
                            pad->SetLocalZoneConnection( ZONE_CONNECTION::THERMAL );
 
                            if( layer_def.thermal_spoke_width > 0 )
                            {
                                pad->SetLocalThermalSpokeWidthOverride(
                                        decalScaler( layer_def.thermal_spoke_width ) );
                            }
 
                            if( layer_def.thermal_spoke_orientation != 0.0 )
                            {
                                pad->SetThermalSpokeAngleDegrees(
                                        layer_def.thermal_spoke_orientation );
                            }
 
                            continue;
                        }
 
                        if( layer_def.shape == "RA" || layer_def.shape == "SA" )
                        {
                            continue;
                        }
 
                        PCB_LAYER_ID kicad_layer = mapPadsLayer( layer_def.layer );
 
                        if( kicad_layer == UNDEFINED_LAYER && layer_def.layer > 0 )
                        {
                            // For non-copper layers, check if they're mask/paste layers.
                            // PADS pad stacks can include explicit solder mask and paste
                            // mask entries that must be preserved in KiCad.
                            // layer_def.layer > 0 skips the copper sentinels -2 (top)
                            // and -1 (bottom), which mapPadsLayer already resolved above.
                            PCB_LAYER_ID tech_layer = getMappedLayer( layer_def.layer );
 
                            if( tech_layer == F_Mask || tech_layer == B_Mask
                                || tech_layer == F_Paste || tech_layer == B_Paste )
                            {
                                layer_set.set( tech_layer );
                            }
                        }
                        else if( kicad_layer != UNDEFINED_LAYER )
                        {
                            layer_set.set( kicad_layer );
 
                            // In NORMAL mode, all copper entries map to the same ALL_LAYERS
                            // slot.  Only the first (primary/component-side) entry sets the
                            // shape; later entries for secondary copper are skipped so they
                            // do not overwrite the primary size.
                            bool is_copper = IsCopperLayer( kicad_layer );
 
                            if( is_copper
                                && normal_copper_set
                                && pad->Padstack().Mode() == PADSTACK::MODE::NORMAL )
                            {
                                continue;
                            }
 
                            convertPadShape( layer_def, pad, kicad_layer, part_orient );
 
                            if( is_copper )
                                normal_copper_set = true;
                        }
                    }
 
                    if( layer_set.none() )
                    {
                        layer_set.set( F_Cu );
                        convertPadShape( stack[0], pad, F_Cu, part_orient );
                    }
 
                    // For SMD pads, enable mask/paste layers that the stack did not
                    // explicitly mention. A zero-size stack entry for a mask/paste layer
                    // means "intentionally disabled" and is tracked in explicitly_seen_tech,
                    // so only layers absent from the stack entirely get the fallback.
                    if( drill == 0 )
                    {
                        if( layer_set.test( F_Cu ) && !layer_set.test( F_Mask )
                            && !explicitly_seen_tech.test( F_Mask ) )
                        {
                            layer_set.set( F_Mask );
                        }
 
                        if( layer_set.test( F_Cu ) && !layer_set.test( F_Paste )
                            && !explicitly_seen_tech.test( F_Paste ) )
                        {
                            layer_set.set( F_Paste );
                        }
 
                        if( layer_set.test( B_Cu ) && !layer_set.test( B_Mask )
                            && !explicitly_seen_tech.test( B_Mask ) )
                        {
                            layer_set.set( B_Mask );
                        }
 
                        if( layer_set.test( B_Cu ) && !layer_set.test( B_Paste )
                            && !explicitly_seen_tech.test( B_Paste ) )
                        {
                            layer_set.set( B_Paste );
                        }
                    }
 
                    if( slot_length > 0 && slot_length != drill )
                    {
                        pad->SetDrillShape( PAD_DRILL_SHAPE::OBLONG );
 
                        int drillMinor = decalScaler( drill );
                        int drillMajor = decalScaler( slot_length );
 
                        // Slot orientation is in the decal's local frame.
                        // Subtract the pad shape rotation to get the slot
                        // angle in the pad's own local frame.
                        double relAngle = slot_orientation - pad_rotation;
 
                        relAngle = fmod( relAngle, 360.0 );
 
                        if( relAngle < 0 )
                            relAngle += 360.0;
 
                        bool vertical = ( relAngle > 45.0 && relAngle < 135.0 )
                                        || ( relAngle > 225.0 && relAngle < 315.0 );
 
                        if( vertical )
                            pad->SetDrillSize( VECTOR2I( drillMinor, drillMajor ) );
                        else
                            pad->SetDrillSize( VECTOR2I( drillMajor, drillMinor ) );
                    }
                    else
                    {
                        pad->SetDrillSize( VECTOR2I( decalScaler( drill ),
                                                     decalScaler( drill ) ) );
                    }
 
                    if( drill == 0 )
                    {
                        pad->SetAttribute( PAD_ATTRIB::SMD );
                    }
                    else
                    {
                        if( plated )
                            pad->SetAttribute( PAD_ATTRIB::PTH );
                        else
                            pad->SetAttribute( PAD_ATTRIB::NPTH );
 
                        // Preserve any explicit mask/paste layer bits accumulated
                        // during stack iteration before expanding to all copper layers.
                        LSET mask_paste_bits =
                                layer_set & LSET( { F_Mask, B_Mask, F_Paste, B_Paste } );
                        layer_set = LSET::AllCuMask() | mask_paste_bits;
                    }
 
                    pad->SetLayerSet( layer_set );
                }
                else
                {
                    int fallbackSize = std::max( decalScaler( 1.5 ), m_minObjectSize );
                    pad->SetSize( F_Cu, VECTOR2I( fallbackSize, fallbackSize ) );
                    pad->SetShape( F_Cu, PAD_SHAPE::CIRCLE );
                    pad->SetAttribute( PAD_ATTRIB::PTH );
                    pad->SetLayerSet( LSET::AllCuMask() );
                }
 
                std::string pinKey = pads_part.name + "." + term.name;
                auto netIt = m_pinToNetMap.find( pinKey );
 
                if( netIt != m_pinToNetMap.end() )
                {
                    NETINFO_ITEM* net =
                            m_loadBoard->FindNet( PADS_COMMON::ConvertInvertedNetName( netIt->second ) );
 
                    if( net )
                        pad->SetNet( net );
                }
            }
 
            for( const auto& item : decal.items )
            {
                if( item.points.empty() )
                    continue;
 
                // Decal graphics layers work differently from routing layers in PADS.
                // Layer 0 and layer 1 are typically footprint outlines, not copper.
                PCB_LAYER_ID shape_layer = F_SilkS;
 
                if( item.layer == 0 )
                {
                    shape_layer = F_SilkS;
                }
                else
                {
                    PCB_LAYER_ID mapped_layer = getMappedLayer( item.layer );
 
                    if( IsCopperLayer( mapped_layer ) )
                    {
                        if( mapped_layer == B_Cu )
                            shape_layer = B_SilkS;
                        else
                            shape_layer = F_SilkS;
                    }
                    else
                    {
                        shape_layer = mapped_layer;
                    }
                }
 
                if( shape_layer == UNDEFINED_LAYER )
                {
                    if( m_reporter )
                    {
                        m_reporter->Report( wxString::Format(
                                _( "Skipping decal item on unmapped layer %d" ), item.layer ),
                                RPT_SEVERITY_WARNING );
                    }
                    continue;
                }
 
                bool is_circle = ( item.type == "CIRCLE" );
                bool is_closed = ( item.type == "CLOSED" || is_circle );
 
                // Per PADS spec: CIRCLE pieces have 2 corners representing ends of
                // horizontal diameter.
                if( is_circle && item.points.size() >= 2 )
                {
                    PCB_SHAPE* shape = new PCB_SHAPE( footprint, SHAPE_T::CIRCLE );
                    shape->SetLayer( shape_layer );
 
                    double x1 = item.points[0].x;
                    double y1 = item.points[0].y;
                    double x2 = item.points[1].x;
                    double y2 = item.points[1].y;
 
                    double cx = ( x1 + x2 ) / 2.0;
                    double cy = ( y1 + y2 ) / 2.0;
 
                    double radius = std::sqrt( ( x2 - x1 ) * ( x2 - x1 )
                                               + ( y2 - y1 ) * ( y2 - y1 ) )
                                    / 2.0;
 
                    int scaledRadius = std::max( decalScaler( radius ), m_minObjectSize );
                    VECTOR2I center( decalScaler( cx ), -decalScaler( cy ) );
                    VECTOR2I pt_on_circle( center.x + scaledRadius, center.y );
 
                    RotatePoint( center, part_orient );
                    RotatePoint( pt_on_circle, part_orient );
 
                    VECTOR2I fp_pos = footprint->GetPosition();
                    shape->SetCenter( fp_pos + center );
                    shape->SetEnd( fp_pos + pt_on_circle );
                    shape->SetStroke(
                            STROKE_PARAMS( decalScaler( item.width ), LINE_STYLE::SOLID ) );
 
                    footprint->Add( shape );
 
                    continue;
                }
 
                if( item.points.size() < 2 )
                    continue;
 
                for( size_t i = 0; i < item.points.size() - 1; ++i )
                {
                    const PADS_IO::ARC_POINT& p1 = item.points[i];
                    const PADS_IO::ARC_POINT& p2 = item.points[i + 1];
 
                    PCB_SHAPE* shape = new PCB_SHAPE( footprint );
                    shape->SetLayer( shape_layer );
                    shape->SetStroke(
                            STROKE_PARAMS( decalScaler( item.width ), LINE_STYLE::SOLID ) );
 
                    if( p2.is_arc )
                    {
                        shape->SetShape( SHAPE_T::ARC );
                        VECTOR2I center( decalScaler( p2.arc.cx ), -decalScaler( p2.arc.cy ) );
                        VECTOR2I start( decalScaler( p1.x ), -decalScaler( p1.y ) );
                        VECTOR2I end( decalScaler( p2.x ), -decalScaler( p2.y ) );
 
                        // Y-axis flip reverses arc winding; swap endpoints for CCW arcs
                        if( p2.arc.delta_angle > 0 )
                            std::swap( start, end );
 
                        RotatePoint( center, part_orient );
                        RotatePoint( start, part_orient );
                        RotatePoint( end, part_orient );
 
                        VECTOR2I fp_pos = footprint->GetPosition();
                        shape->SetCenter( fp_pos + center );
                        shape->SetStart( fp_pos + start );
                        shape->SetEnd( fp_pos + end );
                    }
                    else
                    {
                        shape->SetShape( SHAPE_T::SEGMENT );
                        VECTOR2I start( decalScaler( p1.x ), -decalScaler( p1.y ) );
                        VECTOR2I end( decalScaler( p2.x ), -decalScaler( p2.y ) );
 
                        RotatePoint( start, part_orient );
                        RotatePoint( end, part_orient );
 
                        VECTOR2I fp_pos = footprint->GetPosition();
                        shape->SetStart( fp_pos + start );
                        shape->SetEnd( fp_pos + end );
                    }
 
                    footprint->Add( shape );
                }
 
                if( is_closed && item.points.size() > 2 )
                {
                    const PADS_IO::ARC_POINT& pLast = item.points.back();
                    const PADS_IO::ARC_POINT& pFirst = item.points.front();
 
                    PCB_SHAPE* shape = new PCB_SHAPE( footprint );
                    shape->SetLayer( shape_layer );
                    shape->SetStroke(
                            STROKE_PARAMS( decalScaler( item.width ), LINE_STYLE::SOLID ) );
 
                    if( pFirst.is_arc )
                    {
                        shape->SetShape( SHAPE_T::ARC );
                        VECTOR2I center( decalScaler( pFirst.arc.cx ),
                                         -decalScaler( pFirst.arc.cy ) );
                        VECTOR2I start( decalScaler( pLast.x ), -decalScaler( pLast.y ) );
                        VECTOR2I end( decalScaler( pFirst.x ), -decalScaler( pFirst.y ) );
 
                        if( pFirst.arc.delta_angle > 0 )
                            std::swap( start, end );
 
                        RotatePoint( center, part_orient );
                        RotatePoint( start, part_orient );
                        RotatePoint( end, part_orient );
 
                        VECTOR2I fp_pos = footprint->GetPosition();
                        shape->SetCenter( fp_pos + center );
                        shape->SetStart( fp_pos + start );
                        shape->SetEnd( fp_pos + end );
                    }
                    else
                    {
                        shape->SetShape( SHAPE_T::SEGMENT );
                        VECTOR2I start( decalScaler( pLast.x ), -decalScaler( pLast.y ) );
                        VECTOR2I end( decalScaler( pFirst.x ), -decalScaler( pFirst.y ) );
 
                        RotatePoint( start, part_orient );
                        RotatePoint( end, part_orient );
 
                        VECTOR2I fp_pos = footprint->GetPosition();
                        shape->SetStart( fp_pos + start );
                        shape->SetEnd( fp_pos + end );
                    }
 
                    footprint->Add( shape );
                }
            }
        }
 
        if( pads_part.bottom_layer )
        {
            footprint->Flip( footprint->GetPosition(), FLIP_DIRECTION::LEFT_RIGHT );
        }
    }
}
 
 
void PCB_IO_PADS::loadReuseBlockGroups()
{
    const auto& reuse_blocks = m_parser->GetReuseBlocks();
 
    if( reuse_blocks.empty() )
        return;
 
    std::map<std::string, PCB_GROUP*> blockGroups;
 
    for( const auto& [blockName, block] : reuse_blocks )
    {
        if( !block.instances.empty() || !block.part_names.empty() )
        {
            PCB_GROUP* group = new PCB_GROUP( m_loadBoard );
            group->SetName( wxString::FromUTF8( blockName ) );
            m_loadBoard->Add( group );
            blockGroups[blockName] = group;
        }
    }
 
    for( FOOTPRINT* fp : m_loadBoard->Footprints() )
    {
        for( PCB_FIELD* field : fp->GetFields() )
        {
            if( field->GetName() == wxT( "PADS_Reuse_Block" ) )
            {
                std::string blockName = field->GetText().ToStdString();
                auto groupIt = blockGroups.find( blockName );
 
                if( groupIt != blockGroups.end() )
                {
                    groupIt->second->AddItem( fp );
                }
 
                break;
            }
        }
    }
}
 
 
void PCB_IO_PADS::loadTestPoints()
{
    const auto& test_points = m_parser->GetTestPoints();
    const auto& via_defs = m_parser->GetViaDefs();
 
    for( const auto& tp : test_points )
    {
        FOOTPRINT* footprint = new FOOTPRINT( m_loadBoard );
 
        wxString refDes = wxString::Format( wxT( "TP%d" ), m_testPointIndex++ );
        footprint->SetReference( refDes );
        footprint->SetValue( wxString::FromUTF8( tp.symbol_name ) );
 
        VECTOR2I pos( scaleCoord( tp.x, true ), scaleCoord( tp.y, false ) );
        footprint->SetPosition( pos );
 
        // Default layer and size; refined below from the via definition.
        PCB_LAYER_ID layer = ( tp.side == 2 ) ? B_Cu : F_Cu;
        int tpSize = std::max( scaleSize( 50.0 ), m_minObjectSize );
 
        auto it = via_defs.find( tp.symbol_name );
 
        if( it != via_defs.end() )
        {
            const PADS_IO::VIA_DEF& def = it->second;
 
            // Inspect the pad stack once to recover both the pad size and the
            // board side.  A non-zero pad on copper layer -2 (top) or -1 (bottom)
            // takes first priority for the side; when those are both zero (an
            // in-circuit test point) the soldermask layers (25=top, 28=bottom)
            // indicate the side instead.  The pad size falls back to the largest
            // stack entry when the via definition carries no explicit size.
            double stackSize    = def.size;
            bool   hasTopPad    = false;
            bool   hasBottomPad = false;
            bool   hasMaskTop   = false;
            bool   hasMaskBot   = false;
 
            for( const auto& stackLayer : def.stack )
            {
                if( def.size <= 0.0 && stackLayer.sizeA > stackSize )
                    stackSize = stackLayer.sizeA;
 
                if( stackLayer.layer == PADS_LAYER_MAPPER::LAYER_PAD_STACK_TOP
                    && stackLayer.sizeA > 0.0 )
                {
                    hasTopPad = true;
                }
                else if( stackLayer.layer == PADS_LAYER_MAPPER::LAYER_PAD_STACK_BOTTOM
                         && stackLayer.sizeA > 0.0 )
                {
                    hasBottomPad = true;
                }
                else if( stackLayer.layer == PADS_LAYER_MAPPER::LAYER_SOLDERMASK_TOP )
                {
                    hasMaskTop = true;
                }
                else if( stackLayer.layer == PADS_LAYER_MAPPER::LAYER_SOLDERMASK_BOTTOM )
                {
                    hasMaskBot = true;
                }
            }
 
            if( stackSize > 0.0 )
                tpSize = std::max( scaleSize( stackSize ), m_minObjectSize );
 
            if( hasTopPad && !hasBottomPad )
                layer = F_Cu;
            else if( hasBottomPad && !hasTopPad )
                layer = B_Cu;
            else if( hasMaskBot && !hasMaskTop )
                layer = B_Cu;
            else if( hasMaskTop && !hasMaskBot )
                layer = F_Cu;
        }
 
        footprint->SetLayer( layer );
 
        PAD* pad = new PAD( footprint );
        pad->SetNumber( wxT( "1" ) );
        pad->SetPosition( pos );
        pad->SetShape( PADSTACK::ALL_LAYERS, PAD_SHAPE::CIRCLE );
        pad->SetSize( PADSTACK::ALL_LAYERS, VECTOR2I( tpSize, tpSize ) );
        pad->SetAttribute( PAD_ATTRIB::SMD );
        pad->SetLayerSet( layer == B_Cu ? LSET( { B_Cu } ) : LSET( { F_Cu } ) );
 
        if( !tp.net_name.empty() )
        {
            NETINFO_ITEM* net = m_loadBoard->FindNet( PADS_COMMON::ConvertInvertedNetName( tp.net_name ) );
 
            if( net )
                pad->SetNet( net );
        }
 
        footprint->Add( pad );
 
        footprint->SetBoardOnly( true );
 
        PCB_FIELD* tpField = new PCB_FIELD( footprint, FIELD_T::USER, wxT( "Test_Point" ) );
        tpField->SetLayer( Cmts_User );
        tpField->SetVisible( false );
        tpField->SetText( wxString::FromUTF8( tp.type ) );
        footprint->Add( tpField );
 
        m_loadBoard->Add( footprint );
    }
}
 
 
void PCB_IO_PADS::loadTexts()
{
    const auto& texts = m_parser->GetTexts();
 
    for( const auto& pads_text : texts )
    {
        PCB_LAYER_ID textLayer = getMappedLayer( pads_text.layer );
 
        if( textLayer == UNDEFINED_LAYER )
        {
            if( m_reporter )
            {
                m_reporter->Report( wxString::Format(
                        _( "Text on unmapped layer %d assigned to Comments layer" ),
                        pads_text.layer ), RPT_SEVERITY_WARNING );
            }
            textLayer = Cmts_User;
        }
 
        PCB_TEXT* text = new PCB_TEXT( m_loadBoard );
        text->SetText( pads_text.content );
 
        // PADS text cell height includes internal leading and descender space.
        // Scale factors calibrated to match PADS rendered character dimensions.
        int scaledSize = scaleSize( pads_text.height );
        int charHeight =
                static_cast<int>( scaledSize * ADVANCED_CFG::GetCfg().m_PadsPcbTextHeightScale );
        int charWidth =
                static_cast<int>( scaledSize * ADVANCED_CFG::GetCfg().m_PadsPcbTextWidthScale );
        text->SetTextSize( VECTOR2I( charWidth, charHeight ) );
 
        if( pads_text.width > 0 )
            text->SetTextThickness( scaleSize( pads_text.width ) );
 
        EDA_ANGLE textAngle( pads_text.rotation, DEGREES_T );
        text->SetTextAngle( textAngle );
 
        // PADS text anchor differs from KiCad by a small offset along the
        // reading direction. Shift left (toward text start) to compensate.
        VECTOR2I pos( scaleCoord( pads_text.location.x, true ),
                      scaleCoord( pads_text.location.y, false ) );
        VECTOR2I textShift( -ADVANCED_CFG::GetCfg().m_PadsTextAnchorOffsetNm, 0 );
        RotatePoint( textShift, textAngle );
        text->SetPosition( pos + textShift );
 
        if( pads_text.hjust == "LEFT" )
            text->SetHorizJustify( GR_TEXT_H_ALIGN_LEFT );
        else if( pads_text.hjust == "RIGHT" )
            text->SetHorizJustify( GR_TEXT_H_ALIGN_RIGHT );
        else
            text->SetHorizJustify( GR_TEXT_H_ALIGN_CENTER );
 
        if( pads_text.vjust == "UP" )
            text->SetVertJustify( GR_TEXT_V_ALIGN_TOP );
        else if( pads_text.vjust == "DOWN" )
            text->SetVertJustify( GR_TEXT_V_ALIGN_BOTTOM );
        else
            text->SetVertJustify( GR_TEXT_V_ALIGN_CENTER );
 
        text->SetKeepUpright( false );
        text->SetLayer( textLayer );
        m_loadBoard->Add( text );
    }
}
 
 
void PCB_IO_PADS::loadTracksAndVias()
{
    const auto& routes = m_parser->GetRoutes();
    std::set<std::pair<int, int>> placedThroughVias;
 
    // Build a position set for test-point vias so we don't also place a bare
    // PCB_VIA at those locations; loadTestPoints() already creates footprints.
    std::set<std::pair<int, int>> testPointPositions;
 
    for( const auto& tp : m_parser->GetTestPoints() )
    {
        if( tp.type == "VIA" )
        {
            testPointPositions.emplace( scaleCoord( tp.x, true ),
                                        scaleCoord( tp.y, false ) );
        }
    }
 
    for( const auto& route : routes )
    {
        NETINFO_ITEM* net = m_loadBoard->FindNet( PADS_COMMON::ConvertInvertedNetName( route.net_name ) );
 
        if( !net )
            continue;
 
        for( const auto& track_def : route.tracks )
        {
            if( track_def.points.size() < 2 )
                continue;
 
            PCB_LAYER_ID track_layer = getMappedLayer( track_def.layer );
 
            if( !IsCopperLayer( track_layer ) )
            {
                if( m_reporter )
                {
                    m_reporter->Report( wxString::Format(
                            _( "Skipping track on non-copper layer %d" ), track_def.layer ),
                            RPT_SEVERITY_WARNING );
                }
                continue;
            }
 
            int track_width = std::max( scaleSize( track_def.width ), m_minObjectSize );
 
            for( size_t i = 0; i < track_def.points.size() - 1; ++i )
            {
                const PADS_IO::ARC_POINT& p1 = track_def.points[i];
                const PADS_IO::ARC_POINT& p2 = track_def.points[i + 1];
 
                VECTOR2I start( scaleCoord( p1.x, true ), scaleCoord( p1.y, false ) );
                VECTOR2I end( scaleCoord( p2.x, true ), scaleCoord( p2.y, false ) );
 
                // Skip near-zero-length segments (can occur at via points with width changes).
                // Tolerance of 1000nm accounts for floating point precision in coordinate
                // transformation.
                if( ( start - end ).EuclideanNorm() < 1000 )
                    continue;
 
                if( p2.is_arc )
                {
                    SHAPE_ARC shapeArc = makeMidpointArc( p1, p2, track_width );
 
                    PCB_ARC* arc = new PCB_ARC( m_loadBoard, &shapeArc );
                    arc->SetNet( net );
                    arc->SetWidth( track_width );
                    arc->SetLayer( track_layer );
                    m_loadBoard->Add( arc );
                }
                else
                {
                    PCB_TRACK* track = new PCB_TRACK( m_loadBoard );
                    track->SetNet( net );
                    track->SetWidth( track_width );
                    track->SetLayer( track_layer );
                    track->SetStart( start );
                    track->SetEnd( end );
                    m_loadBoard->Add( track );
                }
            }
        }
 
        for( const auto& via_def : route.vias )
        {
            VECTOR2I pos( scaleCoord( via_def.location.x, true ),
                          scaleCoord( via_def.location.y, false ) );
 
            // Test-point vias are imported as footprints by loadTestPoints().
            if( testPointPositions.count( { pos.x, pos.y } ) )
                continue;
 
            VIATYPE viaType = VIATYPE::THROUGH;
            auto it = m_parser->GetViaDefs().find( via_def.name );
 
            if( it != m_parser->GetViaDefs().end() )
            {
                switch( it->second.via_type )
                {
                case PADS_IO::VIA_TYPE::THROUGH:  viaType = VIATYPE::THROUGH;  break;
                case PADS_IO::VIA_TYPE::BLIND:    viaType = VIATYPE::BLIND;    break;
                case PADS_IO::VIA_TYPE::BURIED:   viaType = VIATYPE::BURIED;   break;
                case PADS_IO::VIA_TYPE::MICROVIA: viaType = VIATYPE::MICROVIA; break;
                }
            }
 
            // Through-hole vias shared across multiple SIGNAL blocks for the same net
            // produce duplicates. Skip if we already placed one at this position.
            if( viaType == VIATYPE::THROUGH )
            {
                auto key = std::make_pair( pos.x, pos.y );
 
                if( placedThroughVias.count( key ) )
                    continue;
 
                placedThroughVias.insert( key );
            }
 
            PCB_VIA* via = new PCB_VIA( m_loadBoard );
            via->SetNet( net );
            via->SetPosition( pos );
 
            if( it != m_parser->GetViaDefs().end() )
            {
                const PADS_IO::VIA_DEF& def = it->second;
 
                via->SetWidth( std::max( scaleSize( def.size ), m_minObjectSize ) );
                via->SetDrill( std::max( scaleSize( def.drill ), m_minObjectSize ) );
 
                PCB_LAYER_ID startLayer = ( def.start_layer > 0 )
                                                 ? getMappedLayer( def.start_layer )
                                                 : UNDEFINED_LAYER;
                PCB_LAYER_ID endLayer = ( def.end_layer > 0 )
                                                ? getMappedLayer( def.end_layer )
                                                : UNDEFINED_LAYER;
 
                if( startLayer != UNDEFINED_LAYER && endLayer != UNDEFINED_LAYER )
                {
                    via->SetLayerPair( startLayer, endLayer );
                    via->SetViaType( viaType );
                }
                else
                {
                    via->SetLayerPair( F_Cu, B_Cu );
                    via->SetViaType( VIATYPE::THROUGH );
                }
 
                if( !def.has_mask_front )
                    via->SetFrontTentingMode( TENTING_MODE::TENTED );
 
                if( !def.has_mask_back )
                    via->SetBackTentingMode( TENTING_MODE::TENTED );
 
            }
            else
            {
                via->SetWidth( std::max( scaleSize( 20.0 ), m_minObjectSize ) );
                via->SetDrill( std::max( scaleSize( 10.0 ), m_minObjectSize ) );
                via->SetLayerPair( F_Cu, B_Cu );
                via->SetViaType( VIATYPE::THROUGH );
            }
 
            m_loadBoard->Add( via );
        }
    }
}
 
 
void PCB_IO_PADS::loadCopperShapes()
{
    const auto& copperShapes = m_parser->GetCopperShapes();
 
    // Check if a COPPER_SHAPE is a non-copper straight-line segment suitable for
    // rectangle grouping (2 outline points, no arcs, not filled, not cutout).
    auto isRectCandidate = []( const PADS_IO::COPPER_SHAPE& cs )
    {
        return cs.outline.size() == 2 && !cs.outline[1].is_arc
               && !cs.filled && !cs.is_cutout;
    };
 
    // Check if 4 consecutive entries at idx form a closed axis-aligned rectangle.
    // Each entry must have the same net_name and layer, and consecutive segment
    // endpoints must connect to form a closed cycle with only horizontal/vertical edges.
    auto tryFormRectangle = [&]( size_t idx, VECTOR2I& minCorner, VECTOR2I& maxCorner ) -> bool
    {
        if( idx + 3 >= copperShapes.size() )
            return false;
 
        const auto& c0 = copperShapes[idx];
        const auto& c1 = copperShapes[idx + 1];
        const auto& c2 = copperShapes[idx + 2];
        const auto& c3 = copperShapes[idx + 3];
 
        if( !isRectCandidate( c0 ) || !isRectCandidate( c1 )
            || !isRectCandidate( c2 ) || !isRectCandidate( c3 ) )
        {
            return false;
        }
 
        if( c1.net_name != c0.net_name || c2.net_name != c0.net_name
            || c3.net_name != c0.net_name )
        {
            return false;
        }
 
        if( c1.layer != c0.layer || c2.layer != c0.layer || c3.layer != c0.layer )
            return false;
 
        // Get the 4 segment start/end pairs in scaled coordinates
        VECTOR2I pts[8];
        const PADS_IO::COPPER_SHAPE* segs[4] = { &c0, &c1, &c2, &c3 };
 
        for( int i = 0; i < 4; ++i )
        {
            pts[i * 2] = VECTOR2I( scaleCoord( segs[i]->outline[0].x, true ),
                                    scaleCoord( segs[i]->outline[0].y, false ) );
            pts[i * 2 + 1] = VECTOR2I( scaleCoord( segs[i]->outline[1].x, true ),
                                        scaleCoord( segs[i]->outline[1].y, false ) );
        }
 
        // Each segment must be axis-aligned
        for( int i = 0; i < 4; ++i )
        {
            VECTOR2I s = pts[i * 2];
            VECTOR2I e = pts[i * 2 + 1];
 
            if( s.x != e.x && s.y != e.y )
                return false;
        }
 
        // Consecutive segments must connect (end of N == start of N+1)
        for( int i = 0; i < 3; ++i )
        {
            if( pts[i * 2 + 1] != pts[( i + 1 ) * 2] )
                return false;
        }
 
        // Cycle must close (end of last == start of first)
        if( pts[7] != pts[0] )
            return false;
 
        // Compute bounding box from the 4 corner points
        int minX = pts[0].x, maxX = pts[0].x;
        int minY = pts[0].y, maxY = pts[0].y;
 
        for( int i = 0; i < 8; ++i )
        {
            minX = std::min( minX, pts[i].x );
            maxX = std::max( maxX, pts[i].x );
            minY = std::min( minY, pts[i].y );
            maxY = std::max( maxY, pts[i].y );
        }
 
        minCorner = VECTOR2I( minX, minY );
        maxCorner = VECTOR2I( maxX, maxY );
        return true;
    };
 
    for( size_t idx = 0; idx < copperShapes.size(); ++idx )
    {
        const auto& copper = copperShapes[idx];
 
        if( copper.outline.size() < 2 )
            continue;
 
        if( copper.is_cutout )
            continue;
 
        PCB_LAYER_ID layer = getMappedLayer( copper.layer );
 
        if( layer == UNDEFINED_LAYER )
        {
            if( m_reporter )
            {
                m_reporter->Report( wxString::Format(
                        _( "COPPER item on unmapped layer %d defaulting to F.Cu" ),
                        copper.layer ),
                        RPT_SEVERITY_WARNING );
            }
 
            layer = F_Cu;
        }
 
        int width = std::max( scaleSize( copper.width ), m_minObjectSize );
 
        if( !IsCopperLayer( layer ) )
        {
            // Check for 4 consecutive entries forming an axis-aligned rectangle
            VECTOR2I minCorner, maxCorner;
 
            if( tryFormRectangle( idx, minCorner, maxCorner ) )
            {
                PCB_SHAPE* rect = new PCB_SHAPE( m_loadBoard );
                rect->SetShape( SHAPE_T::RECTANGLE );
                rect->SetStart( minCorner );
                rect->SetEnd( maxCorner );
                rect->SetStroke( STROKE_PARAMS( width, LINE_STYLE::SOLID ) );
                rect->SetLayer( layer );
                m_loadBoard->Add( rect );
 
                idx += 3;
                continue;
            }
 
            // EasyEDA PADS exports place footprint silkscreen outlines in the *LINES*
            // section as COPPER type on the silkscreen layer. Import these as board
            // graphics on their actual layer rather than forcing them onto copper.
            for( size_t i = 0; i < copper.outline.size() - 1; ++i )
            {
                const auto& p1 = copper.outline[i];
                const auto& p2 = copper.outline[i + 1];
 
                VECTOR2I start( scaleCoord( p1.x, true ), scaleCoord( p1.y, false ) );
                VECTOR2I end( scaleCoord( p2.x, true ), scaleCoord( p2.y, false ) );
 
                if( ( start - end ).EuclideanNorm() < 1000 )
                    continue;
 
                PCB_SHAPE* shape = new PCB_SHAPE( m_loadBoard );
 
                if( p2.is_arc )
                {
                    setPcbShapeArc( shape, p1, p2 );
                }
                else
                {
                    shape->SetShape( SHAPE_T::SEGMENT );
                    shape->SetStart( start );
                    shape->SetEnd( end );
                }
 
                shape->SetStroke( STROKE_PARAMS( width, LINE_STYLE::SOLID ) );
                shape->SetLayer( layer );
                m_loadBoard->Add( shape );
            }
 
            continue;
        }
 
        NETINFO_ITEM* net = nullptr;
 
        if( !copper.net_name.empty() )
            net = m_loadBoard->FindNet( PADS_COMMON::ConvertInvertedNetName( copper.net_name ) );
 
        if( copper.filled )
        {
            if( copper.outline.size() < 3 )
                continue;
 
            ZONE* zone = new ZONE( m_loadBoard );
            zone->SetLayer( layer );
            zone->SetIsRuleArea( false );
 
            if( net )
                zone->SetNet( net );
 
            SHAPE_LINE_CHAIN outline;
            appendArcPoints( outline, copper.outline );
            outline.SetClosed( true );
            zone->Outline()->AddOutline( outline );
            zone->SetBorderDisplayStyle( ZONE_BORDER_DISPLAY_STYLE::DIAGONAL_EDGE, ZONE::GetDefaultHatchPitch(), true );
 
            m_loadBoard->Add( zone );
        }
        else
        {
            for( size_t i = 0; i < copper.outline.size() - 1; ++i )
            {
                const auto& p1 = copper.outline[i];
                const auto& p2 = copper.outline[i + 1];
 
                VECTOR2I start( scaleCoord( p1.x, true ), scaleCoord( p1.y, false ) );
                VECTOR2I end( scaleCoord( p2.x, true ), scaleCoord( p2.y, false ) );
 
                if( ( start - end ).EuclideanNorm() < 1000 )
                    continue;
 
                if( p2.is_arc )
                {
                    SHAPE_ARC shapeArc = makeMidpointArc( p1, p2, width );
 
                    PCB_ARC* arc = new PCB_ARC( m_loadBoard, &shapeArc );
 
                    if( net )
                        arc->SetNet( net );
 
                    arc->SetWidth( width );
                    arc->SetLayer( layer );
                    m_loadBoard->Add( arc );
                }
                else
                {
                    PCB_TRACK* track = new PCB_TRACK( m_loadBoard );
 
                    if( net )
                        track->SetNet( net );
 
                    track->SetWidth( width );
                    track->SetLayer( layer );
                    track->SetStart( start );
                    track->SetEnd( end );
                    m_loadBoard->Add( track );
                }
            }
        }
    }
}
 
 
void PCB_IO_PADS::loadClusterGroups()
{
    const auto& clusters = m_parser->GetClusters();
 
    if( clusters.empty() )
        return;
 
    std::map<std::string, const PADS_IO::CLUSTER*> netToClusterMap;
 
    for( const auto& cluster : clusters )
    {
        for( const std::string& netName : cluster.net_names )
        {
            std::string converted = PADS_COMMON::ConvertInvertedNetName( netName ).ToStdString();
            netToClusterMap[converted] = &cluster;
        }
    }
 
    std::map<int, PCB_GROUP*> clusterGroups;
 
    for( const auto& cluster : clusters )
    {
        PCB_GROUP* group = new PCB_GROUP( m_loadBoard );
        group->SetName( wxString::FromUTF8( cluster.name ) );
        m_loadBoard->Add( group );
        clusterGroups[cluster.id] = group;
    }
 
    for( PCB_TRACK* track : m_loadBoard->Tracks() )
    {
        NETINFO_ITEM* net = track->GetNet();
 
        if( net )
        {
            std::string netName = net->GetNetname().ToStdString();
            auto clusterIt = netToClusterMap.find( netName );
 
            if( clusterIt != netToClusterMap.end() )
            {
                int clusterId = clusterIt->second->id;
                auto groupIt = clusterGroups.find( clusterId );
 
                if( groupIt != clusterGroups.end() )
                {
                    groupIt->second->AddItem( track );
                }
            }
        }
    }
}
 
 
void PCB_IO_PADS::loadZones()
{
    const auto& pours = m_parser->GetPours();
    const auto& params = m_parser->GetParameters();
 
    // Returns true if the points can produce a valid polygon (at least 3 vertices
    // for a regular polygon, or a single full-circle point).
    auto isValidPoly = []( const std::vector<PADS_IO::ARC_POINT>& pts )
    {
        if( pts.size() >= 3 )
            return true;
 
        if( pts.size() == 1 && pts[0].is_arc
            && std::abs( pts[0].arc.delta_angle ) >= 359.0 )
        {
            return true;
        }
 
        return false;
    };
 
    // PADS uses lower numbers = higher priority (priority 1 fills on top),
    // while KiCad uses higher numbers = higher priority.
    int maxPriority = 0;
 
    for( const auto& pour_def : pours )
    {
        if( pour_def.priority > maxPriority )
            maxPriority = pour_def.priority;
    }
 
    // Map from pour name to created zone for linking HATOUT/VOIDOUT later
    std::map<std::string, ZONE*> pourZoneMap;
 
    // Map from HATOUT name to parent POUROUT name for VOIDOUT chain resolution
    std::map<std::string, std::string> hatoutToParent;
 
    // First pass: create zones from POUROUT records and build lookup maps
    for( const auto& pour_def : pours )
    {
        if( pour_def.style == PADS_IO::POUR_STYLE::HATCHED )
        {
            hatoutToParent[pour_def.name] = pour_def.owner_pour;
            continue;
        }
 
        if( pour_def.style == PADS_IO::POUR_STYLE::VOIDOUT
            || pour_def.thermal_type != PADS_IO::THERMAL_TYPE::NONE )
        {
            continue;
        }
 
        if( pour_def.points.size() < 3 )
            continue;
 
        PCB_LAYER_ID pourLayer = getMappedLayer( pour_def.layer );
 
        if( pourLayer == UNDEFINED_LAYER )
        {
            if( m_reporter )
            {
                m_reporter->Report( wxString::Format(
                        _( "Skipping pour on unmapped layer %d" ), pour_def.layer ),
                        RPT_SEVERITY_WARNING );
            }
 
            continue;
        }
 
        ZONE* zone = new ZONE( m_loadBoard );
        zone->SetLayer( pourLayer );
 
        zone->Outline()->NewOutline();
        appendArcPoints( zone->Outline()->Outline( 0 ), pour_def.points );
        zone->SetBorderDisplayStyle( ZONE_BORDER_DISPLAY_STYLE::DIAGONAL_EDGE, ZONE::GetDefaultHatchPitch(), true );
 
        if( pour_def.is_cutout )
        {
            zone->SetIsRuleArea( true );
            zone->SetDoNotAllowZoneFills( true );
            zone->SetDoNotAllowTracks( false );
            zone->SetDoNotAllowVias( false );
            zone->SetDoNotAllowPads( false );
            zone->SetDoNotAllowFootprints( false );
            zone->SetZoneName( wxString::Format( wxT( "Cutout_%s" ), pour_def.owner_pour ) );
        }
        else
        {
            NETINFO_ITEM* net = m_loadBoard->FindNet(
                    PADS_COMMON::ConvertInvertedNetName( pour_def.net_name ) );
 
            if( net )
                zone->SetNet( net );
 
            int kicadPriority = maxPriority - pour_def.priority + 1;
            zone->SetAssignedPriority( kicadPriority );
            zone->SetMinThickness( scaleSize( pour_def.width ) );
 
            zone->SetThermalReliefGap( scaleSize( params.thermal_min_clearance ) );
            zone->SetThermalReliefSpokeWidth( scaleSize( params.thermal_line_width ) );
 
            zone->SetPadConnection( ZONE_CONNECTION::FULL );
        }
 
        pourZoneMap[pour_def.name] = zone;
        m_loadBoard->Add( zone );
    }
 
    // Second pass: build fill polygons from HATOUT records with VOIDOUT holes
    for( const auto& pour_def : pours )
    {
        if( pour_def.style != PADS_IO::POUR_STYLE::HATCHED )
            continue;
 
        if( !isValidPoly( pour_def.points ) )
            continue;
 
        auto zoneIt = pourZoneMap.find( pour_def.owner_pour );
 
        if( zoneIt == pourZoneMap.end() )
            continue;
 
        ZONE* zone = zoneIt->second;
        PCB_LAYER_ID pourLayer = zone->GetLayer();
 
        SHAPE_POLY_SET fillPoly;
        fillPoly.NewOutline();
        appendArcPoints( fillPoly.Outline( 0 ), pour_def.points );
 
        // PADS HATOUT fill data can contain self-intersecting vertices where
        // narrow corridors route between pads. Run Clipper2 union on the
        // outline before subtracting holes, since Simplify can introduce
        // micro-artifacts in clean complex polygons.
        if( fillPoly.Outline( 0 ).PointCount() >= 3
            && fillPoly.IsPolygonSelfIntersecting( 0 ) )
        {
            fillPoly.Simplify();
        }
 
        fillPoly.Inflate( scaleSize( pour_def.width ) / 2, CORNER_STRATEGY::ROUND_ALL_CORNERS, ARC_HIGH_DEF );
 
        // Collect all matching VOIDOUT regions into a single poly set and
        // subtract in one operation. PADS VOIDOUT shapes can extend beyond
        // the HATOUT outline boundary (PADS clips at render time), so
        // boolean subtraction is needed rather than treating them as
        // contained holes. Batching avoids Clipper2 precision accumulation
        // from repeated sequential operations.
        SHAPE_POLY_SET allVoids;
 
        for( const auto& void_def : pours )
        {
            if( void_def.style != PADS_IO::POUR_STYLE::VOIDOUT )
                continue;
 
            if( !isValidPoly( void_def.points ) )
                continue;
 
            // VOIDOUT's owner_pour points to a HATOUT name. Check if that
            // HATOUT is owned by our POUROUT.
            auto parentIt = hatoutToParent.find( void_def.owner_pour );
 
            if( parentIt == hatoutToParent.end() )
                continue;
 
            if( parentIt->second != pour_def.owner_pour )
                continue;
 
            SHAPE_POLY_SET voidPoly;
            voidPoly.NewOutline();
            appendArcPoints( voidPoly.Outline( 0 ), void_def.points );
            voidPoly.Inflate( scaleSize( void_def.width ) / 2, CORNER_STRATEGY::ROUND_ALL_CORNERS, ARC_HIGH_DEF );
 
            allVoids.Append( voidPoly );
        }
 
        if( allVoids.OutlineCount() > 0 )
            fillPoly.BooleanSubtract( allVoids );
 
        zone->SetFilledPolysList( pourLayer, fillPoly );
        zone->SetIsFilled( true );
    }
}
 
 
void PCB_IO_PADS::loadBoardOutline()
{
    for( const PADS_IO::POLYLINE& polyline : m_parser->GetBoardOutlines() )
    {
        const auto& pts = polyline.points;
 
        if( pts.size() < 2 )
            continue;
 
        for( size_t i = 0; i < pts.size() - 1; ++i )
        {
            const PADS_IO::ARC_POINT& p1 = pts[i];
            const PADS_IO::ARC_POINT& p2 = pts[i + 1];
 
            if( std::abs( p1.x - p2.x ) < 0.001 && std::abs( p1.y - p2.y ) < 0.001 )
                continue;
 
            PCB_SHAPE* shape = new PCB_SHAPE( m_loadBoard );
 
            if( p2.is_arc )
            {
                setPcbShapeArc( shape, p1, p2 );
            }
            else
            {
                shape->SetShape( SHAPE_T::SEGMENT );
                shape->SetStart( VECTOR2I( scaleCoord( p1.x, true ),
                                           scaleCoord( p1.y, false ) ) );
                shape->SetEnd( VECTOR2I( scaleCoord( p2.x, true ),
                                         scaleCoord( p2.y, false ) ) );
            }
 
            shape->SetWidth( scaleSize( polyline.width ) );
            shape->SetLayer( Edge_Cuts );
            m_loadBoard->Add( shape );
        }
 
        // PADS format repeats the first point at the end for closed polygons, so check
        // if pLast already equals pFirst to avoid creating a zero-length closing segment
        if( polyline.closed && pts.size() > 2 )
        {
            const PADS_IO::ARC_POINT& pLast = pts.back();
            const PADS_IO::ARC_POINT& pFirst = pts.front();
 
            bool needsClosing = ( std::abs( pLast.x - pFirst.x ) > 0.001
                                  || std::abs( pLast.y - pFirst.y ) > 0.001 );
 
            if( needsClosing )
            {
                PCB_SHAPE* shape = new PCB_SHAPE( m_loadBoard );
 
                if( pFirst.is_arc )
                {
                    setPcbShapeArc( shape, pLast, pFirst );
                }
                else
                {
                    shape->SetShape( SHAPE_T::SEGMENT );
                    shape->SetStart( VECTOR2I( scaleCoord( pLast.x, true ),
                                               scaleCoord( pLast.y, false ) ) );
                    shape->SetEnd( VECTOR2I( scaleCoord( pFirst.x, true ),
                                             scaleCoord( pFirst.y, false ) ) );
                }
 
                shape->SetWidth( scaleSize( polyline.width ) );
                shape->SetLayer( Edge_Cuts );
                m_loadBoard->Add( shape );
            }
        }
    }
}
 
 
void PCB_IO_PADS::loadDimensions()
{
    const auto& dimensions = m_parser->GetDimensions();
 
    for( const auto& dim : dimensions )
    {
        if( dim.points.size() < 2 )
            continue;
 
        PCB_DIM_ALIGNED* dimension = new PCB_DIM_ALIGNED( m_loadBoard, PCB_DIM_ALIGNED_T );
 
        VECTOR2I start( scaleCoord( dim.points[0].x, true ),
                        scaleCoord( dim.points[0].y, false ) );
        VECTOR2I end( scaleCoord( dim.points[1].x, true ),
                      scaleCoord( dim.points[1].y, false ) );
 
        // PADS horizontal/vertical dimensions measure only the X or Y projection.
        // PCB_DIM_ALIGNED measures along the start→end direction, so if the base
        // points differ on the non-measured axis the line becomes skewed.
        // Project the end point onto the measurement axis.
        if( dim.is_horizontal )
            end.y = start.y;
        else
            end.x = start.x;
 
        dimension->SetStart( start );
        dimension->SetEnd( end );
 
        // The crossbar_pos is the absolute coordinate of the crossbar. We compute
        // height as the offset from the start point to the crossbar.
        if( dim.is_horizontal )
        {
            double heightOffset = dim.crossbar_pos - dim.points[0].y;
            int height = -scaleSize( heightOffset );
            dimension->SetHeight( height );
        }
        else
        {
            double heightOffset = dim.crossbar_pos - dim.points[0].x;
            int height = scaleSize( heightOffset );
            dimension->SetHeight( height );
        }
 
        PCB_LAYER_ID dimLayer = getMappedLayer( dim.layer );
 
        if( dimLayer == UNDEFINED_LAYER || IsCopperLayer( dimLayer ) )
            dimLayer = Cmts_User;
 
        dimension->SetLayer( dimLayer );
 
        // PADS text_width is stroke thickness, not character width.
        // Calculate character dimensions from height.
        if( dim.text_height > 0 )
        {
            int scaledSize = scaleSize( dim.text_height );
            int charHeight =
                    static_cast<int>( scaledSize * ADVANCED_CFG::GetCfg().m_PadsPcbTextHeightScale );
            int charWidth =
                    static_cast<int>( scaledSize * ADVANCED_CFG::GetCfg().m_PadsPcbTextWidthScale );
            dimension->SetTextSize( VECTOR2I( charWidth, charHeight ) );
 
            if( dim.text_width > 0 )
                dimension->SetTextThickness( scaleSize( dim.text_width ) );
        }
 
        if( !dim.text.empty() )
        {
            dimension->SetOverrideTextEnabled( true );
            dimension->SetOverrideText( wxString::FromUTF8( dim.text ) );
        }
 
        dimension->SetLineThickness( scaleSize( 5.0 ) );
 
        if( dim.rotation != 0.0 )
            dimension->SetTextAngle( EDA_ANGLE( dim.rotation, DEGREES_T ) );
 
        dimension->Update();
        m_loadBoard->Add( dimension );
    }
}
 
 
void PCB_IO_PADS::loadKeepouts()
{
    const auto& keepouts = m_parser->GetKeepouts();
    int keepoutIndex = 0;
 
    for( const auto& ko : keepouts )
    {
        if( ko.outline.size() < 3 )
            continue;
 
        ZONE* zone = new ZONE( m_loadBoard );
        zone->SetIsRuleArea( true );
 
        if( ko.layers.empty() )
        {
            zone->SetLayerSet( LSET::AllCuMask() );
        }
        else if( ko.layers.size() == 1 )
        {
            PCB_LAYER_ID koLayer = getMappedLayer( ko.layers[0] );
 
            if( koLayer == UNDEFINED_LAYER )
            {
                if( m_reporter )
                {
                    m_reporter->Report( wxString::Format(
                            _( "Skipping keepout on unmapped layer %d" ), ko.layers[0] ),
                            RPT_SEVERITY_WARNING );
                }
                delete zone;
                continue;
            }
 
            zone->SetLayer( koLayer );
        }
        else
        {
            LSET layerSet;
 
            for( int layer : ko.layers )
            {
                PCB_LAYER_ID mappedLayer = getMappedLayer( layer );
 
                if( mappedLayer != UNDEFINED_LAYER )
                    layerSet.set( mappedLayer );
            }
 
            if( layerSet.none() )
            {
                if( m_reporter )
                    m_reporter->Report( _( "Skipping keepout with no valid layers" ), RPT_SEVERITY_WARNING );
                delete zone;
                continue;
            }
 
            zone->SetLayerSet( layerSet );
        }
 
        zone->SetDoNotAllowTracks( ko.no_traces );
        zone->SetDoNotAllowVias( ko.no_vias );
        zone->SetDoNotAllowZoneFills( ko.no_copper );
        zone->SetDoNotAllowFootprints( ko.no_components );
        zone->SetDoNotAllowPads( false );
 
        wxString typeName;
 
        switch( ko.type )
        {
        case PADS_IO::KEEPOUT_TYPE::ALL:       typeName = wxT( "Keepout" ); break;
        case PADS_IO::KEEPOUT_TYPE::ROUTE:     typeName = wxT( "RouteKeepout" ); break;
        case PADS_IO::KEEPOUT_TYPE::VIA:       typeName = wxT( "ViaKeepout" ); break;
        case PADS_IO::KEEPOUT_TYPE::COPPER:    typeName = wxT( "CopperKeepout" ); break;
        case PADS_IO::KEEPOUT_TYPE::PLACEMENT: typeName = wxT( "PlacementKeepout" ); break;
        }
 
        zone->SetZoneName( wxString::Format( wxT( "%s_%d" ), typeName, ++keepoutIndex ) );
 
        SHAPE_LINE_CHAIN koChain;
        appendArcPoints( koChain, ko.outline );
 
        // Close the outline if first and last points don't match
        if( ko.outline.size() > 2 )
        {
            const auto& first = ko.outline.front();
            const auto& last = ko.outline.back();
 
            if( std::abs( first.x - last.x ) > 0.001 || std::abs( first.y - last.y ) > 0.001 )
                koChain.Append( scaleCoord( first.x, true ), scaleCoord( first.y, false ) );
        }
 
        koChain.SetClosed( true );
        zone->Outline()->AddOutline( koChain );
        zone->SetBorderDisplayStyle( ZONE_BORDER_DISPLAY_STYLE::DIAGONAL_EDGE, ZONE::GetDefaultHatchPitch(), true );
 
        m_loadBoard->Add( zone );
    }
}
 
 
void PCB_IO_PADS::loadGraphicLines()
{
    for( const PADS_IO::GRAPHIC_LINE& graphic : m_parser->GetGraphicLines() )
    {
        const auto& pts = graphic.points;
 
        PCB_LAYER_ID graphicLayer = getMappedLayer( graphic.layer );
 
        if( graphicLayer == UNDEFINED_LAYER )
            continue;
 
        if( pts.size() == 1 && pts[0].is_arc
            && std::abs( pts[0].arc.delta_angle - 360.0 ) < 0.1 )
        {
            PCB_SHAPE* shape = new PCB_SHAPE( m_loadBoard );
            shape->SetShape( SHAPE_T::CIRCLE );
            VECTOR2I center( scaleCoord( pts[0].arc.cx, true ),
                             scaleCoord( pts[0].arc.cy, false ) );
            int radius = std::max( scaleSize( pts[0].arc.radius ), m_minObjectSize );
            shape->SetCenter( center );
            shape->SetEnd( VECTOR2I( center.x + radius, center.y ) );
            shape->SetWidth( scaleSize( graphic.width ) );
            shape->SetLayer( graphicLayer );
            m_loadBoard->Add( shape );
            continue;
        }
 
        if( pts.size() < 2 )
            continue;
 
        for( size_t i = 0; i < pts.size() - 1; ++i )
        {
            const PADS_IO::ARC_POINT& p1 = pts[i];
            const PADS_IO::ARC_POINT& p2 = pts[i + 1];
 
            if( std::abs( p1.x - p2.x ) < 0.001 && std::abs( p1.y - p2.y ) < 0.001 )
                continue;
 
            PCB_SHAPE* shape = new PCB_SHAPE( m_loadBoard );
 
            if( p2.is_arc )
            {
                setPcbShapeArc( shape, p1, p2 );
            }
            else
            {
                shape->SetShape( SHAPE_T::SEGMENT );
                shape->SetStart( VECTOR2I( scaleCoord( p1.x, true ),
                                           scaleCoord( p1.y, false ) ) );
                shape->SetEnd( VECTOR2I( scaleCoord( p2.x, true ),
                                         scaleCoord( p2.y, false ) ) );
            }
 
            shape->SetWidth( scaleSize( graphic.width ) );
            shape->SetLayer( graphicLayer );
            m_loadBoard->Add( shape );
        }
 
        if( graphic.closed && pts.size() > 2 )
        {
            const PADS_IO::ARC_POINT& pLast = pts.back();
            const PADS_IO::ARC_POINT& pFirst = pts.front();
 
            bool needsClosing = ( std::abs( pLast.x - pFirst.x ) > 0.001
                                  || std::abs( pLast.y - pFirst.y ) > 0.001 );
 
            if( needsClosing )
            {
                PCB_SHAPE* shape = new PCB_SHAPE( m_loadBoard );
 
                if( pFirst.is_arc )
                {
                    setPcbShapeArc( shape, pLast, pFirst );
                }
                else
                {
                    shape->SetShape( SHAPE_T::SEGMENT );
                    shape->SetStart( VECTOR2I( scaleCoord( pLast.x, true ),
                                               scaleCoord( pLast.y, false ) ) );
                    shape->SetEnd( VECTOR2I( scaleCoord( pFirst.x, true ),
                                             scaleCoord( pFirst.y, false ) ) );
                }
 
                shape->SetWidth( scaleSize( graphic.width ) );
                shape->SetLayer( graphicLayer );
                m_loadBoard->Add( shape );
            }
        }
    }
}
 
 
void PCB_IO_PADS::generateDrcRules( const wxString& aFileName )
{
    wxFileName fn( aFileName );
    fn.SetExt( wxT( "kicad_dru" ) );
 
    wxString customRules = wxT( "(version 1)\n" );
 
    const auto& diffPairs = m_parser->GetDiffPairs();
 
    for( const auto& dp : diffPairs )
    {
        if( dp.name.empty() || ( dp.gap <= 0 && dp.width <= 0 ) )
            continue;
 
        wxString ruleName = wxString::Format( wxT( "DiffPair_%s" ), wxString::FromUTF8( dp.name ) );
 
        if( dp.gap > 0 && !dp.positive_net.empty() && !dp.negative_net.empty() )
        {
            wxString posNet = PADS_COMMON::ConvertInvertedNetName( dp.positive_net );
            wxString negNet = PADS_COMMON::ConvertInvertedNetName( dp.negative_net );
            double gapMm = dp.gap * m_scaleFactor / PADS_UNIT_CONVERTER::MM_TO_NM;
            wxString gapStr = wxString::FromUTF8( FormatDouble2Str( gapMm ) ) + wxT( "mm" );
 
            customRules += wxString::Format(
                wxT( "\n(rule \"%s_gap\"\n" )
                wxT( "  (condition \"A.NetName == '%s' && B.NetName == '%s'\")\n" )
                wxT( "  (constraint clearance (min %s)))\n" ),
                ruleName, posNet, negNet, gapStr );
        }
    }
 
    if( customRules.length() > 15 )
    {
        wxFile rulesFile( fn.GetFullPath(), wxFile::write );
 
        if( rulesFile.IsOpened() )
            rulesFile.Write( customRules );
    }
}
 
 
void PCB_IO_PADS::reportStatistics()
{
    if( !m_reporter )
        return;
 
    size_t trackCount = 0;
    size_t viaCount = 0;
 
    for( PCB_TRACK* track : m_loadBoard->Tracks() )
    {
        if( track->Type() == PCB_VIA_T )
            viaCount++;
        else
            trackCount++;
    }
 
    m_reporter->Report( wxString::Format( _( "Imported %zu footprints, %d nets, %zu tracks,"
                                              " %zu vias, %zu zones" ),
                                           m_loadBoard->Footprints().size(),
                                           m_loadBoard->GetNetCount(),
                                           trackCount, viaCount,
                                           m_loadBoard->Zones().size() ),
                         RPT_SEVERITY_INFO );
}
 
 
std::map<wxString, PCB_LAYER_ID> PCB_IO_PADS::DefaultLayerMappingCallback(
        const std::vector<INPUT_LAYER_DESC>& aInputLayerDescriptionVector )
{
    std::map<wxString, PCB_LAYER_ID> layer_map;
 
    for( const INPUT_LAYER_DESC& layer : aInputLayerDescriptionVector )
    {
        layer_map[layer.Name] = layer.AutoMapLayer;
    }
 
    return layer_map;
}
 
 
int PCB_IO_PADS::scaleSize( double aVal ) const
{
    int64_t nm = m_unitConverter.ToNanometersSize( aVal );
    return static_cast<int>( std::clamp<int64_t>( nm, INT_MIN, INT_MAX ) );
}
 
 
double PCB_IO_PADS::decalUnitScale( const std::string& aUnits ) const
{
    if( m_parser->IsBasicUnits() )
        return 0.0;
 
    if( aUnits == "I" || aUnits == "MIL" || aUnits == "MILS" )
        return PADS_UNIT_CONVERTER::MILS_TO_NM;
 
    if( aUnits == "M" || aUnits == "MM" || aUnits == "METRIC" )
        return PADS_UNIT_CONVERTER::MM_TO_NM;
 
    if( aUnits == "INCH" || aUnits == "INCHES" )
        return PADS_UNIT_CONVERTER::INCHES_TO_NM;
 
    return 0.0;
}
 
 
int PCB_IO_PADS::scaleCoord( double aVal, bool aIsX ) const
{
    double origin = aIsX ? m_originX : m_originY;
 
    long long origin_nm = static_cast<long long>( std::round( origin * m_scaleFactor ) );
    long long val_nm = static_cast<long long>( std::round( aVal * m_scaleFactor ) );
 
    long long result = aIsX ? ( val_nm - origin_nm ) : ( origin_nm - val_nm );
    return static_cast<int>( std::clamp<long long>( result, INT_MIN, INT_MAX ) );
}
 
 
PCB_LAYER_ID PCB_IO_PADS::getMappedLayer( int aPadsLayer ) const
{
    for( const auto& info : m_layerInfos )
    {
        if( info.padsLayerNum == aPadsLayer )
        {
            auto it = m_layer_map.find( wxString::FromUTF8( info.name ) );
 
            if( it != m_layer_map.end() && it->second != UNDEFINED_LAYER )
                return it->second;
 
            return m_layerMapper.GetAutoMapLayer( aPadsLayer, info.type );
        }
    }
 
    return m_layerMapper.GetAutoMapLayer( aPadsLayer );
}
 
 
void PCB_IO_PADS::ensureNet( const std::string& aNetName )
{
    if( aNetName.empty() )
        return;
 
    wxString wxName = PADS_COMMON::ConvertInvertedNetName( aNetName );
 
    if( m_loadBoard->FindNet( wxName ) == nullptr )
    {
        NETINFO_ITEM* net = new NETINFO_ITEM( m_loadBoard, wxName,
                                               m_loadBoard->GetNetCount() + 1 );
        m_loadBoard->Add( net );
    }
}
 
 
void PCB_IO_PADS::clearLoadingState()
{
    m_loadBoard = nullptr;
    m_parser = nullptr;
    m_unitConverter = PADS_UNIT_CONVERTER();
    m_layerMapper = PADS_LAYER_MAPPER();
    m_layerInfos.clear();
    m_scaleFactor = 0.0;
    m_originX = 0.0;
    m_originY = 0.0;
    m_pinToNetMap.clear();
    m_partToBlockMap.clear();
    m_testPointIndex = 1;
}
 
 
void PCB_IO_PADS::appendArcPoints( SHAPE_LINE_CHAIN& aChain,
                                    const std::vector<PADS_IO::ARC_POINT>& aPts )
{
    if( aPts.empty() )
        return;
 
    // Single full-circle entry becomes a 36-segment polygon
    if( aPts.size() == 1 && aPts[0].is_arc
        && std::abs( aPts[0].arc.delta_angle ) >= 359.0 )
    {
        VECTOR2I center( scaleCoord( aPts[0].arc.cx, true ),
                         scaleCoord( aPts[0].arc.cy, false ) );
        int radius = scaleSize( aPts[0].arc.radius );
 
        constexpr int NUM_SEGS = 36;
 
        for( int i = 0; i < NUM_SEGS; i++ )
        {
            double angle = 2.0 * M_PI * i / NUM_SEGS;
            aChain.Append( center.x + KiROUND( radius * cos( angle ) ),
                           center.y + KiROUND( radius * sin( angle ) ) );
        }
 
        return;
    }
 
    aChain.Append( scaleCoord( aPts[0].x, true ), scaleCoord( aPts[0].y, false ) );
 
    for( size_t i = 1; i < aPts.size(); i++ )
    {
        const auto& pt = aPts[i];
 
        if( pt.is_arc )
        {
            SHAPE_ARC arc = makeMidpointArc( aPts[i - 1], pt, 0 );
            const SHAPE_LINE_CHAIN arcPoly = arc.ConvertToPolyline();
 
            for( int j = 1; j < arcPoly.PointCount(); j++ )
                aChain.Append( arcPoly.CPoint( j ).x, arcPoly.CPoint( j ).y );
        }
        else
        {
            aChain.Append( scaleCoord( pt.x, true ), scaleCoord( pt.y, false ) );
        }
    }
}
 
 
void PCB_IO_PADS::setPcbShapeArc( PCB_SHAPE* aShape, const PADS_IO::ARC_POINT& aPrev,
                                   const PADS_IO::ARC_POINT& aCurr )
{
    aShape->SetShape( SHAPE_T::ARC );
 
    VECTOR2I center( scaleCoord( aCurr.arc.cx, true ), scaleCoord( aCurr.arc.cy, false ) );
    VECTOR2I start( scaleCoord( aPrev.x, true ), scaleCoord( aPrev.y, false ) );
    VECTOR2I end( scaleCoord( aCurr.x, true ), scaleCoord( aCurr.y, false ) );
 
    // Y-axis flip reverses arc winding; swap endpoints for CCW arcs
    if( aCurr.arc.delta_angle > 0 )
        std::swap( start, end );
 
    aShape->SetCenter( center );
    aShape->SetStart( start );
    aShape->SetEnd( end );
}
 
 
SHAPE_ARC PCB_IO_PADS::makeMidpointArc( const PADS_IO::ARC_POINT& aPrev,
                                          const PADS_IO::ARC_POINT& aCurr, int aWidth )
{
    VECTOR2I start( scaleCoord( aPrev.x, true ), scaleCoord( aPrev.y, false ) );
    VECTOR2I end( scaleCoord( aCurr.x, true ), scaleCoord( aCurr.y, false ) );
 
    double midX, midY;
 
    if( aCurr.arc.radius == 0.0 )
    {
        // Route arcs specify only CW/CCW direction without explicit geometry.
        // They are semicircles between the two endpoints. Compute the midpoint
        // on the perpendicular bisector of the chord, at distance radius from
        // the chord center (where radius = half the chord length).
        double dx = aCurr.x - aPrev.x;
        double dy = aCurr.y - aPrev.y;
 
        if( aCurr.arc.delta_angle < 0 )
        {
            // CW: arc bulges to the left of the start-to-end direction
            midX = ( aPrev.x + aCurr.x ) / 2.0 - dy / 2.0;
            midY = ( aPrev.y + aCurr.y ) / 2.0 + dx / 2.0;
        }
        else
        {
            // CCW: arc bulges to the right of the start-to-end direction
            midX = ( aPrev.x + aCurr.x ) / 2.0 + dy / 2.0;
            midY = ( aPrev.y + aCurr.y ) / 2.0 - dx / 2.0;
        }
    }
    else
    {
        // Full arc with explicit center and radius (pours, decals, board outlines).
        // Compute the arc midpoint in PADS coordinate space (before the Y-axis
        // flip in scaleCoord) so the 3-point constructor gets the correct winding.
        double startAngleRad = atan2( aPrev.y - aCurr.arc.cy, aPrev.x - aCurr.arc.cx );
        double midAngleRad = startAngleRad + ( aCurr.arc.delta_angle * M_PI / 180.0 ) / 2.0;
 
        midX = aCurr.arc.cx + aCurr.arc.radius * cos( midAngleRad );
        midY = aCurr.arc.cy + aCurr.arc.radius * sin( midAngleRad );
    }
 
    VECTOR2I mid( scaleCoord( midX, true ), scaleCoord( midY, false ) );
 
    return SHAPE_ARC( start, mid, end, aWidth );
}
 
 
void PCB_IO_PADS::loadBoardSetup()
{
    m_layerMapper.SetCopperLayerCount( m_parser->GetParameters().layer_count );
 
    std::vector<PADS_IO::LAYER_INFO> padsLayerInfos = m_parser->GetLayerInfos();
 
    auto convertLayerType = []( PADS_IO::PADS_LAYER_FUNCTION func ) -> PADS_LAYER_TYPE {
        switch( func )
        {
        case PADS_IO::PADS_LAYER_FUNCTION::ROUTING:
        case PADS_IO::PADS_LAYER_FUNCTION::PLANE:
        case PADS_IO::PADS_LAYER_FUNCTION::MIXED:
            return PADS_LAYER_TYPE::COPPER_INNER;
        case PADS_IO::PADS_LAYER_FUNCTION::SOLDER_MASK:
            return PADS_LAYER_TYPE::SOLDERMASK_TOP;
        case PADS_IO::PADS_LAYER_FUNCTION::PASTE_MASK:
            return PADS_LAYER_TYPE::PASTE_TOP;
        case PADS_IO::PADS_LAYER_FUNCTION::SILK_SCREEN:
            return PADS_LAYER_TYPE::SILKSCREEN_TOP;
        case PADS_IO::PADS_LAYER_FUNCTION::ASSEMBLY:
            return PADS_LAYER_TYPE::ASSEMBLY_TOP;
        case PADS_IO::PADS_LAYER_FUNCTION::DOCUMENTATION:
            return PADS_LAYER_TYPE::DOCUMENTATION;
        case PADS_IO::PADS_LAYER_FUNCTION::DRILL:
            return PADS_LAYER_TYPE::DRILL_DRAWING;
        default:
            return PADS_LAYER_TYPE::UNKNOWN;
        }
    };
 
    for( const auto& padsInfo : padsLayerInfos )
    {
        PADS_LAYER_INFO info;
        info.padsLayerNum = padsInfo.number;
        info.name = padsInfo.name;
 
        if( padsInfo.layer_type != PADS_IO::PADS_LAYER_FUNCTION::UNKNOWN
            && padsInfo.layer_type != PADS_IO::PADS_LAYER_FUNCTION::UNASSIGNED )
        {
            info.type = convertLayerType( padsInfo.layer_type );
 
            std::string lowerName = padsInfo.name;
            std::transform( lowerName.begin(), lowerName.end(), lowerName.begin(),
                            []( unsigned char c ){ return std::tolower( c ); } );
 
            bool isBottom = lowerName.find( "bottom" ) != std::string::npos
                            || lowerName.find( "bot" ) != std::string::npos;
 
            if( info.type == PADS_LAYER_TYPE::SOLDERMASK_TOP && isBottom )
                info.type = PADS_LAYER_TYPE::SOLDERMASK_BOTTOM;
            else if( info.type == PADS_LAYER_TYPE::PASTE_TOP && isBottom )
                info.type = PADS_LAYER_TYPE::PASTE_BOTTOM;
            else if( info.type == PADS_LAYER_TYPE::SILKSCREEN_TOP && isBottom )
                info.type = PADS_LAYER_TYPE::SILKSCREEN_BOTTOM;
            else if( info.type == PADS_LAYER_TYPE::ASSEMBLY_TOP && isBottom )
                info.type = PADS_LAYER_TYPE::ASSEMBLY_BOTTOM;
            else if( info.type == PADS_LAYER_TYPE::COPPER_INNER )
            {
                if( padsInfo.number == 1 )
                    info.type = PADS_LAYER_TYPE::COPPER_TOP;
                else if( padsInfo.number == m_parser->GetParameters().layer_count )
                    info.type = PADS_LAYER_TYPE::COPPER_BOTTOM;
            }
        }
        else
        {
            info.type = m_layerMapper.GetLayerType( padsInfo.number );
        }
 
        info.required = padsInfo.required;
        m_layerInfos.push_back( info );
    }
 
    std::vector<INPUT_LAYER_DESC> inputDescs =
            m_layerMapper.BuildInputLayerDescriptions( m_layerInfos );
 
    if( m_layer_mapping_handler )
        m_layer_map = m_layer_mapping_handler( inputDescs );
 
    int copperLayerCount = m_parser->GetParameters().layer_count;
 
    if( copperLayerCount < 1 )
        copperLayerCount = 2;
 
    m_loadBoard->SetCopperLayerCount( copperLayerCount );
 
    if( m_parser->IsBasicUnits() )
    {
        m_unitConverter.SetBasicUnitsMode( true );
    }
    else
    {
        switch( m_parser->GetParameters().units )
        {
        case PADS_IO::UNIT_TYPE::MILS:
            m_unitConverter.SetBaseUnits( PADS_UNIT_TYPE::MILS );
            break;
        case PADS_IO::UNIT_TYPE::METRIC:
            m_unitConverter.SetBaseUnits( PADS_UNIT_TYPE::METRIC );
            break;
        case PADS_IO::UNIT_TYPE::INCHES:
            m_unitConverter.SetBaseUnits( PADS_UNIT_TYPE::INCHES );
            break;
        }
    }
 
    m_scaleFactor = m_parser->IsBasicUnits()
            ? PADS_UNIT_CONVERTER::BASIC_TO_NM
            : ( m_parser->GetParameters().units == PADS_IO::UNIT_TYPE::MILS
                    ? PADS_UNIT_CONVERTER::MILS_TO_NM
                    : m_parser->GetParameters().units == PADS_IO::UNIT_TYPE::METRIC
                            ? PADS_UNIT_CONVERTER::MM_TO_NM
                            : PADS_UNIT_CONVERTER::INCHES_TO_NM );
 
    const auto& designRules = m_parser->GetDesignRules();
    BOARD_DESIGN_SETTINGS& bds = m_loadBoard->GetDesignSettings();
 
    bds.m_MinClearance = scaleSize( designRules.min_clearance );
    bds.m_TrackMinWidth = scaleSize( designRules.min_track_width );
    bds.m_ViasMinSize = scaleSize( designRules.min_via_size );
    bds.m_MinThroughDrill = scaleSize( designRules.min_via_drill );
    bds.m_HoleToHoleMin = scaleSize( designRules.hole_to_hole );
    bds.m_SilkClearance = scaleSize( designRules.silk_clearance );
    bds.m_SolderMaskExpansion = scaleSize( designRules.mask_clearance );
    bds.m_CopperEdgeClearance = scaleSize( designRules.copper_edge_clearance );
 
    // Do not set the default zone clearance from the PADS design rules.  In PADS,
    // zone (copper pour) clearance is resolved through the net/netclass clearance
    // rules rather than a board-level zone clearance setting.  The default netclass
    // clearance set below is the correct mapping for PADS' DEFAULTCLEAR value.
 
    bds.SetCustomTrackWidth( scaleSize( designRules.default_track_width ) );
    bds.SetCustomViaSize( scaleSize( designRules.default_via_size ) );
    bds.SetCustomViaDrill( scaleSize( designRules.default_via_drill ) );
 
    std::shared_ptr<NETCLASS> defaultNetclass = bds.m_NetSettings->GetDefaultNetclass();
 
    if( defaultNetclass )
    {
        defaultNetclass->SetClearance( scaleSize( designRules.default_clearance ) );
        defaultNetclass->SetTrackWidth( scaleSize( designRules.default_track_width ) );
        defaultNetclass->SetViaDiameter( scaleSize( designRules.default_via_size ) );
        defaultNetclass->SetViaDrill( scaleSize( designRules.default_via_drill ) );
    }
 
    const auto& viaDefs = m_parser->GetViaDefs();
 
    if( !viaDefs.empty() )
    {
        // Use the file's designated default signal via, falling back to the first
        // definition if no explicit default was specified
        const std::string& defaultViaName = m_parser->GetParameters().default_signal_via;
        auto defaultIt = viaDefs.find( defaultViaName );
 
        if( defaultIt == viaDefs.end() )
            defaultIt = viaDefs.begin();
 
        int viaDia = scaleSize( defaultIt->second.size );
        int viaDrill = scaleSize( defaultIt->second.drill );
 
        bds.SetCustomViaSize( viaDia );
        bds.SetCustomViaDrill( viaDrill );
 
        if( defaultNetclass )
        {
            defaultNetclass->SetViaDiameter( viaDia );
            defaultNetclass->SetViaDrill( viaDrill );
        }
 
        for( const auto& [name, def] : viaDefs )
            bds.m_ViasDimensionsList.emplace_back( scaleSize( def.size ), scaleSize( def.drill ) );
    }
 
    const auto& netClasses = m_parser->GetNetClasses();
 
    for( const auto& nc : netClasses )
    {
        if( nc.name.empty() )
            continue;
 
        wxString ncName = wxString::FromUTF8( nc.name );
        std::shared_ptr<NETCLASS> netclass = std::make_shared<NETCLASS>( ncName );
 
        if( nc.clearance > 0 )
            netclass->SetClearance( scaleSize( nc.clearance ) );
 
        if( nc.track_width > 0 )
            netclass->SetTrackWidth( scaleSize( nc.track_width ) );
 
        if( nc.via_size > 0 )
            netclass->SetViaDiameter( scaleSize( nc.via_size ) );
 
        if( nc.via_drill > 0 )
            netclass->SetViaDrill( scaleSize( nc.via_drill ) );
 
        if( nc.diff_pair_width > 0 )
            netclass->SetDiffPairWidth( scaleSize( nc.diff_pair_width ) );
 
        if( nc.diff_pair_gap > 0 )
            netclass->SetDiffPairGap( scaleSize( nc.diff_pair_gap ) );
 
        bds.m_NetSettings->SetNetclass( ncName, netclass );
 
        for( const std::string& netName : nc.net_names )
        {
            wxString wxNetName = PADS_COMMON::ConvertInvertedNetName( netName );
            bds.m_NetSettings->SetNetclassPatternAssignment( wxNetName, ncName );
        }
    }
 
    const auto& diffPairs = m_parser->GetDiffPairs();
 
    for( const auto& dp : diffPairs )
    {
        if( dp.name.empty() )
            continue;
 
        wxString dpClassName =
                wxString::Format( wxT( "DiffPair_%s" ), wxString::FromUTF8( dp.name ) );
        std::shared_ptr<NETCLASS> dpNetclass = std::make_shared<NETCLASS>( dpClassName );
 
        if( dp.gap > 0 )
            dpNetclass->SetDiffPairGap( scaleSize( dp.gap ) );
 
        if( dp.width > 0 )
        {
            dpNetclass->SetDiffPairWidth( scaleSize( dp.width ) );
            dpNetclass->SetTrackWidth( scaleSize( dp.width ) );
        }
 
        bds.m_NetSettings->SetNetclass( dpClassName, dpNetclass );
 
        if( !dp.positive_net.empty() )
        {
            wxString wxPosNet = PADS_COMMON::ConvertInvertedNetName( dp.positive_net );
            bds.m_NetSettings->SetNetclassPatternAssignment( wxPosNet, dpClassName );
        }
 
        if( !dp.negative_net.empty() )
        {
            wxString wxNegNet = PADS_COMMON::ConvertInvertedNetName( dp.negative_net );
            bds.m_NetSettings->SetNetclassPatternAssignment( wxNegNet, dpClassName );
        }
    }
 
    m_originX = m_parser->GetParameters().origin.x;
    m_originY = m_parser->GetParameters().origin.y;
 
    const auto& boardOutlines = m_parser->GetBoardOutlines();
 
    if( !boardOutlines.empty() )
    {
        double min_x = std::numeric_limits<double>::max();
        double max_x = std::numeric_limits<double>::lowest();
        double min_y = std::numeric_limits<double>::max();
        double max_y = std::numeric_limits<double>::lowest();
 
        for( const auto& outline : boardOutlines )
        {
            for( const auto& pt : outline.points )
            {
                min_x = std::min( min_x, pt.x );
                max_x = std::max( max_x, pt.x );
                min_y = std::min( min_y, pt.y );
                max_y = std::max( max_y, pt.y );
            }
        }
 
        if( min_x < max_x && min_y < max_y )
        {
            m_originX = ( min_x + max_x ) / 2.0;
            m_originY = ( min_y + max_y ) / 2.0;
        }
    }
 
    // Build board stackup from LAYER DATA if meaningful data exists.
    // Collect copper layer infos ordered by PADS layer number.
    std::vector<const PADS_IO::LAYER_INFO*> copperLayerInfos;
 
    for( const auto& li : padsLayerInfos )
    {
        if( li.is_copper )
            copperLayerInfos.push_back( &li );
    }
 
    bool hasStackupData = false;
 
    for( const auto* li : copperLayerInfos )
    {
        if( li->layer_thickness > 0.0 || li->dielectric_constant > 0.0 )
        {
            hasStackupData = true;
            break;
        }
    }
 
    if( hasStackupData )
    {
        BOARD_STACKUP& stackup = bds.GetStackupDescriptor();
        stackup.RemoveAll();
        stackup.BuildDefaultStackupList( &bds, copperLayerCount );
 
        // Build a map from KiCad PCB_LAYER_ID to PADS LAYER_INFO for copper layers
        std::map<PCB_LAYER_ID, const PADS_IO::LAYER_INFO*> copperInfoMap;
 
        for( const auto* li : copperLayerInfos )
        {
            PCB_LAYER_ID kicadLayer = getMappedLayer( li->number );
 
            if( kicadLayer != UNDEFINED_LAYER )
                copperInfoMap[kicadLayer] = li;
        }
 
        // Track the previous copper layer's info for dielectric assignment
        const PADS_IO::LAYER_INFO* prevCopperInfo = nullptr;
 
        for( BOARD_STACKUP_ITEM* item : stackup.GetList() )
        {
            if( item->GetType() == BOARD_STACKUP_ITEM_TYPE::BS_ITEM_TYPE_COPPER )
            {
                auto it = copperInfoMap.find( item->GetBrdLayerId() );
 
                if( it != copperInfoMap.end() )
                {
                    prevCopperInfo = it->second;
 
                    if( it->second->copper_thickness > 0.0 )
                        item->SetThickness( scaleSize( it->second->copper_thickness ) );
                }
            }
            else if( item->GetType() == BOARD_STACKUP_ITEM_TYPE::BS_ITEM_TYPE_DIELECTRIC )
            {
                if( prevCopperInfo )
                {
                    if( prevCopperInfo->layer_thickness > 0.0 )
                        item->SetThickness( scaleSize( prevCopperInfo->layer_thickness ) );
 
                    if( prevCopperInfo->dielectric_constant > 0.0 )
                        item->SetEpsilonR( prevCopperInfo->dielectric_constant );
                }
            }
            else if( item->GetType() == BOARD_STACKUP_ITEM_TYPE::BS_ITEM_TYPE_SILKSCREEN )
            {
                item->SetColor( wxT( "White" ) );
            }
            else if( item->GetType() == BOARD_STACKUP_ITEM_TYPE::BS_ITEM_TYPE_SOLDERMASK )
            {
                item->SetColor( wxT( "Green" ) );
            }
        }
 
        int thickness = stackup.BuildBoardThicknessFromStackup();
        bds.SetBoardThickness( thickness );
        bds.m_HasStackup = true;
    }
}