sch_symbol.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2015 Jean-Pierre Charras, jp.charras at wanadoo.fr
 * Copyright (C) 1992-2021 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 <sch_edit_frame.h>
#include <widgets/msgpanel.h>
#include <bitmaps.h>
#include <core/mirror.h>
#include <lib_pin.h>
#include <lib_text.h>
#include <lib_shape.h>
#include <sch_symbol.h>
#include <sch_sheet_path.h>
#include <schematic.h>
#include <trace_helpers.h>
#include <trigo.h>
#include <refdes_utils.h>
#include <wx/log.h>
#include <string_utils.h>


std::string toUTFTildaText( const wxString& txt )
{
 std::string ret = TO_UTF8( txt );

 for( std::string::iterator it = ret.begin(); it!=ret.end(); ++it )
 {
 if( (unsigned char) *it <= ' ' )
 *it = '~';
 }
 return ret;
}


static LIB_SYMBOL* dummy()
{
 static LIB_SYMBOL* symbol;

 if( !symbol )
 {
 symbol = new LIB_SYMBOL( wxEmptyString );

 LIB_SHAPE* square = new LIB_SHAPE( symbol, SHAPE_T::RECT );

 square->MoveTo( wxPoint( Mils2iu( -200 ), Mils2iu( 200 ) ) );
 square->SetEnd( wxPoint( Mils2iu( 200 ), Mils2iu( -200 ) ) );

 LIB_TEXT* text = new LIB_TEXT( symbol );

 text->SetTextSize( wxSize( Mils2iu( 150 ), Mils2iu( 150 ) ) );
 text->SetText( wxString( wxT( "??" ) ) );

 symbol->AddDrawItem( square );
 symbol->AddDrawItem( text );
 }

 return symbol;
}


SCH_SYMBOL::SCH_SYMBOL( const wxPoint& aPos, SCH_ITEM* aParent ) :
 SCH_ITEM( aParent, SCH_SYMBOL_T )
{
 Init( aPos );
}


SCH_SYMBOL::SCH_SYMBOL( const LIB_SYMBOL& aSymbol, const LIB_ID& aLibId,
 const SCH_SHEET_PATH* aSheet, int unit, int convert, const wxPoint& pos ) :
 SCH_ITEM( nullptr, SCH_SYMBOL_T )
{
 Init( pos );

 m_unit = unit;
 m_convert = convert;
 m_lib_id = aLibId;

 std::unique_ptr< LIB_SYMBOL > part;

 part = aSymbol.Flatten();
 part->SetParent();
 SetLibSymbol( part.release() );

 // Copy fields from the library symbol
 UpdateFields( aSheet,
 true, /* update style */
 false, /* update ref */
 false, /* update other fields */
 true, /* reset ref */
 true /* reset other fields */ );

 m_prefix = UTIL::GetRefDesPrefix( m_part->GetReferenceField().GetText() );

 if( aSheet )
 {
 SetRef( aSheet, UTIL::GetRefDesUnannotated( m_prefix ) );

 // Value and footprint name are stored in the SCH_SHEET_PATH path manager,
 // if aSheet != nullptr, not in the symbol itself.
 // Copy them to the currently displayed field texts
 SetValue( GetValue( aSheet, false ) );
 SetFootprint( GetFootprint( aSheet, false ) );
 }

 // Inherit the include in bill of materials and board netlist settings from library symbol.
 m_inBom = aSymbol.GetIncludeInBom();
 m_onBoard = aSymbol.GetIncludeOnBoard();
}


SCH_SYMBOL::SCH_SYMBOL( const LIB_SYMBOL& aSymbol, const SCH_SHEET_PATH* aSheet,
 const PICKED_SYMBOL& aSel, const wxPoint& pos ) :
 SCH_SYMBOL( aSymbol, aSel.LibId, aSheet, aSel.Unit, aSel.Convert, pos )
{
 // Set any fields that were modified as part of the symbol selection
 for( const std::pair<int, wxString>& i : aSel.Fields )
 {
 SCH_FIELD* field = GetFieldById( i.first );

 if( field )
 field->SetText( i.second );
 }
}


SCH_SYMBOL::SCH_SYMBOL( const SCH_SYMBOL& aSymbol ) :
 SCH_ITEM( aSymbol )
{
 m_parent = aSymbol.m_parent;
 m_pos = aSymbol.m_pos;
 m_unit = aSymbol.m_unit;
 m_convert = aSymbol.m_convert;
 m_lib_id = aSymbol.m_lib_id;
 m_isInNetlist = aSymbol.m_isInNetlist;
 m_inBom = aSymbol.m_inBom;
 m_onBoard = aSymbol.m_onBoard;

 if( aSymbol.m_part )
 SetLibSymbol( new LIB_SYMBOL( *aSymbol.m_part.get() ) );

 const_cast<KIID&>( m_Uuid ) = aSymbol.m_Uuid;

 m_transform = aSymbol.m_transform;
 m_prefix = aSymbol.m_prefix;
 m_instanceReferences = aSymbol.m_instanceReferences;
 m_fields = aSymbol.m_fields;

 // Re-parent the fields, which before this had aSymbol as parent
 for( SCH_FIELD& field : m_fields )
 field.SetParent( this );

 m_fieldsAutoplaced = aSymbol.m_fieldsAutoplaced;
 m_schLibSymbolName = aSymbol.m_schLibSymbolName;
}


void SCH_SYMBOL::Init( const wxPoint& pos )
{
 m_pos = pos;
 m_unit = 1; // In multi unit chip - which unit to draw.
 m_convert = LIB_ITEM::LIB_CONVERT::BASE; // De Morgan Handling

 // The rotation/mirror transformation matrix. pos normal
 m_transform = TRANSFORM();

 // construct only the mandatory fields, which are the first 4 only.
 for( int i = 0; i < MANDATORY_FIELDS; ++i )
 {
 m_fields.emplace_back( pos, i, this, TEMPLATE_FIELDNAME::GetDefaultFieldName( i ) );

 if( i == REFERENCE_FIELD )
 m_fields.back().SetLayer( LAYER_REFERENCEPART );
 else if( i == VALUE_FIELD )
 m_fields.back().SetLayer( LAYER_VALUEPART );
 else
 m_fields.back().SetLayer( LAYER_FIELDS );
 }

  m_prefix = wxString( wxT( "U" ) );
 m_isInNetlist = true;
 m_inBom = true;
 m_onBoard = true;
}


EDA_ITEM* SCH_SYMBOL::Clone() const
{
 return new SCH_SYMBOL( *this );
}


void SCH_SYMBOL::ViewGetLayers( int aLayers[], int& aCount ) const
{
 aCount = 4;
 aLayers[0] = LAYER_DANGLING; // Pins are drawn by their parent symbol, so the parent
 // symbol needs to draw to LAYER_DANGLING
 aLayers[1] = LAYER_DEVICE;
 aLayers[2] = LAYER_DEVICE_BACKGROUND;
 aLayers[3] = LAYER_SELECTION_SHADOWS;
}


bool SCH_SYMBOL::IsMovableFromAnchorPoint() const
{
 // If a symbol's anchor is not grid-aligned to its pins then moving from the anchor is
 // going to end up moving the symbol's pins off-grid.

 // The minimal grid size allowed to place a pin is 25 mils
 const int min_grid_size = Mils2iu( 25 );

 for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
 {
 if( ( ( pin->GetPosition().x - m_pos.x ) % min_grid_size ) != 0 )
 return false;

 if( ( ( pin->GetPosition().y - m_pos.y ) % min_grid_size ) != 0 )
 return false;
 }

 return true;
}


void SCH_SYMBOL::SetLibId( const LIB_ID& aLibId )
{
 if( m_lib_id != aLibId )
 {
 m_lib_id = aLibId;
 SetModified();
 }
}


wxString SCH_SYMBOL::GetSchSymbolLibraryName() const
{
 if( !m_schLibSymbolName.IsEmpty() )
 return m_schLibSymbolName;
 else
 return m_lib_id.Format();
}


void SCH_SYMBOL::SetLibSymbol( LIB_SYMBOL* aLibSymbol )
{
 wxCHECK2( ( aLibSymbol == nullptr ) || ( aLibSymbol->IsRoot() ), aLibSymbol = nullptr );

 m_part.reset( aLibSymbol );
 UpdatePins();
}


wxString SCH_SYMBOL::GetDescription() const
{
 if( m_part )
 return m_part->GetDescription();

 return wxEmptyString;
}


wxString SCH_SYMBOL::GetDatasheet() const
{
 if( m_part )
 return m_part->GetDatasheetField().GetText();

 return wxEmptyString;
}


void SCH_SYMBOL::UpdatePins()
{
 std::map<wxString, wxString> altPinMap;
 std::map<wxString, KIID> pinUuidMap;

 for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
 {
 pinUuidMap[ pin->GetNumber() ] = pin->m_Uuid;

 if( !pin->GetAlt().IsEmpty() )
 altPinMap[ pin->GetNumber() ] = pin->GetAlt();
 }

 m_pins.clear();
 m_pinMap.clear();

 if( !m_part )
 return;

 unsigned i = 0;

 for( LIB_PIN* libPin = m_part->GetNextPin(); libPin; libPin = m_part->GetNextPin( libPin ) )
 {
 wxASSERT( libPin->Type() == LIB_PIN_T );

 if( libPin->GetConvert() && m_convert && ( m_convert != libPin->GetConvert() ) )
 continue;

 m_pins.push_back( std::make_unique<SCH_PIN>( libPin, this ) );

 auto ii = pinUuidMap.find( libPin->GetNumber() );

 if( ii != pinUuidMap.end() )
 const_cast<KIID&>( m_pins.back()->m_Uuid ) = ii->second;

 auto iii = altPinMap.find( libPin->GetNumber() );

 if( iii != altPinMap.end() )
 m_pins.back()->SetAlt( iii->second );

 m_pinMap[ libPin ] = i;

 ++i;
 }
}


void SCH_SYMBOL::SetUnit( int aUnit )
{
 if( m_unit != aUnit )
 {
 m_unit = aUnit;
 SetModified();
 }
}


void SCH_SYMBOL::UpdateUnit( int aUnit )
{
 m_unit = aUnit;
}


void SCH_SYMBOL::SetConvert( int aConvert )
{
 if( m_convert != aConvert )
 {
 m_convert = aConvert;

 // The convert may have a different pin layout so the update the pin map.
 UpdatePins();
 SetModified();
 }
}


void SCH_SYMBOL::SetTransform( const TRANSFORM& aTransform )
{
 if( m_transform != aTransform )
 {
 m_transform = aTransform;
 SetModified();
 }
}


int SCH_SYMBOL::GetUnitCount() const
{
 if( m_part )
 return m_part->GetUnitCount();

 return 0;
}


void SCH_SYMBOL::Print( const RENDER_SETTINGS* aSettings, const wxPoint& aOffset )
{
 LIB_SYMBOL_OPTIONS opts;
 opts.transform = m_transform;
 opts.draw_visible_fields = false;
 opts.draw_hidden_fields = false;

 if( m_part )
 {
 m_part->Print( aSettings, m_pos + aOffset, m_unit, m_convert, opts );
 }
 else // Use dummy() part if the actual cannot be found.
 {
 dummy()->Print( aSettings, m_pos + aOffset, 0, 0, opts );
 }

 for( SCH_FIELD& field : m_fields )
 field.Print( aSettings, aOffset );
}


void SCH_SYMBOL::AddHierarchicalReference( const KIID_PATH& aPath, const wxString& aRef,
 int aUnit, const wxString& aValue,
 const wxString& aFootprint )
{
 // Search for an existing path and remove it if found (should not occur)
 for( unsigned ii = 0; ii < m_instanceReferences.size(); ii++ )
 {
 if( m_instanceReferences[ii].m_Path == aPath )
 {
 wxLogTrace( traceSchSheetPaths, wxT( "Removing symbol instance:\n" )
 wxT( " sheet path %s\n" )
 wxT( " reference %s, unit %d from symbol %s." ),
 aPath.AsString(),
 m_instanceReferences[ii].m_Reference,
 m_instanceReferences[ii].m_Unit,
 m_Uuid.AsString() );

 m_instanceReferences.erase( m_instanceReferences.begin() + ii );
 ii--;
 }
 }

 SYMBOL_INSTANCE_REFERENCE instance;
 instance.m_Path = aPath;
 instance.m_Reference = aRef;
 instance.m_Unit = aUnit;
 instance.m_Value = aValue;
 instance.m_Footprint = aFootprint;

 wxLogTrace( traceSchSheetPaths, wxT( "Adding symbol instance:\n" )
 wxT( " sheet path %s\n" )
 wxT( " reference %s, unit %d to symbol %s." ),
 aPath.AsString(),
 aRef,
 aUnit,
 m_Uuid.AsString() );

 m_instanceReferences.push_back( instance );
}


const wxString SCH_SYMBOL::GetRef( const SCH_SHEET_PATH* sheet, bool aIncludeUnit ) const
{
 KIID_PATH path = sheet->Path();
 wxString ref;

 for( const SYMBOL_INSTANCE_REFERENCE& instance : m_instanceReferences )
 {
 if( instance.m_Path == path )
 {
 ref = instance.m_Reference;
 break;
 }
 }

 // If it was not found in m_Paths array, then see if it is in m_Field[REFERENCE] -- if so,
 // use this as a default for this path. This will happen if we load a version 1 schematic
 // file. It will also mean that multiple instances of the same sheet by default all have
 // the same symbol references, but perhaps this is best.
 if( ref.IsEmpty() && !GetField( REFERENCE_FIELD )->GetText().IsEmpty() )
 {
 const_cast<SCH_SYMBOL*>( this )->SetRef( sheet, GetField( REFERENCE_FIELD )->GetText() );
 ref = GetField( REFERENCE_FIELD )->GetText();
 }

 if( ref.IsEmpty() )
 ref = UTIL::GetRefDesUnannotated( m_prefix );

 if( aIncludeUnit && GetUnitCount() > 1 )
 ref += LIB_SYMBOL::SubReference( GetUnit() );

 return ref;
}


bool SCH_SYMBOL::IsReferenceStringValid( const wxString& aReferenceString )
{
 return !UTIL::GetRefDesPrefix( aReferenceString ).IsEmpty();
}


void SCH_SYMBOL::SetRef( const SCH_SHEET_PATH* sheet, const wxString& ref )
{
 KIID_PATH path = sheet->Path();
 bool notInArray = true;

 // check to see if it is already there before inserting it
 for( SYMBOL_INSTANCE_REFERENCE& instance : m_instanceReferences )
 {
 if( instance.m_Path == path )
 {
 instance.m_Reference = ref;
 notInArray = false;
 }
 }

 if( notInArray )
 AddHierarchicalReference( path, ref, m_unit );

 for( std::unique_ptr<SCH_PIN>& pin : m_pins )
 pin->ClearDefaultNetName( sheet );

 SCH_FIELD* rf = GetField( REFERENCE_FIELD );

 rf->SetText( ref ); // for drawing.

 // Reinit the m_prefix member if needed
 m_prefix = UTIL::GetRefDesPrefix( ref );

 if( m_prefix.IsEmpty() )
 m_prefix = wxT( "U" );

 // Power symbols have references starting with # and are not included in netlists
 m_isInNetlist = ! ref.StartsWith( wxT( "#" ) );
}


bool SCH_SYMBOL::IsAnnotated( const SCH_SHEET_PATH* aSheet )
{
 KIID_PATH path = aSheet->Path();

 for( const SYMBOL_INSTANCE_REFERENCE& instance : m_instanceReferences )
 {
 if( instance.m_Path == path )
 return instance.m_Reference.Last() != '?';
 }

 return false;
}


int SCH_SYMBOL::GetUnitSelection( const SCH_SHEET_PATH* aSheet ) const
{
 KIID_PATH path = aSheet->Path();

 for( const SYMBOL_INSTANCE_REFERENCE& instance : m_instanceReferences )
 {
 if( instance.m_Path == path )
 return instance.m_Unit;
 }

 // If it was not found in m_Paths array, then use m_unit. This will happen if we load a
 // version 1 schematic file.
 return m_unit;
}


void SCH_SYMBOL::SetUnitSelection( const SCH_SHEET_PATH* aSheet, int aUnitSelection )
{
 KIID_PATH path = aSheet->Path();

 // check to see if it is already there before inserting it
 for( SYMBOL_INSTANCE_REFERENCE& instance : m_instanceReferences )
 {
 if( instance.m_Path == path )
 {
 instance.m_Unit = aUnitSelection;
 return;
 }
 }

 // didn't find it; better add it
 AddHierarchicalReference( path, UTIL::GetRefDesUnannotated( m_prefix ), aUnitSelection );
}


void SCH_SYMBOL::SetUnitSelection( int aUnitSelection )
{
 for( SYMBOL_INSTANCE_REFERENCE& instance : m_instanceReferences )
 instance.m_Unit = aUnitSelection;
}


const wxString SCH_SYMBOL::GetValue( const SCH_SHEET_PATH* sheet, bool aResolve ) const
{
 KIID_PATH path = sheet->Path();

 for( const SYMBOL_INSTANCE_REFERENCE& instance : m_instanceReferences )
 {
 if( instance.m_Path == path && !instance.m_Value.IsEmpty() )
 {
 // This can only be overridden by a new value but if we are resolving,
 // make sure that the symbol returns the fully resolved text
 if( aResolve )
 {
 SCH_SYMBOL new_sym( *this );
 new_sym.GetField( VALUE_FIELD )->SetText( instance.m_Value );
 return new_sym.GetField( VALUE_FIELD )->GetShownText();
 }

 return instance.m_Value;
 }
 }

 if( !aResolve )
 return GetField( VALUE_FIELD )->GetText();

 return GetField( VALUE_FIELD )->GetShownText();
}


void SCH_SYMBOL::SetValue( const SCH_SHEET_PATH* sheet, const wxString& aValue )
{
 if( sheet == nullptr )
 {
 // Set all instances to the updated value
 for( SYMBOL_INSTANCE_REFERENCE& instance : m_instanceReferences )
 instance.m_Value = aValue;

 m_fields[ VALUE_FIELD ].SetText( aValue );
 return;
 }

 KIID_PATH path = sheet->Path();

 // check to see if it is already there before inserting it
 for( SYMBOL_INSTANCE_REFERENCE& instance : m_instanceReferences )
 {
 if( instance.m_Path == path )
 {
 instance.m_Value = aValue;
 return;
 }
 }

 // didn't find it; better add it
 AddHierarchicalReference( path, UTIL::GetRefDesUnannotated( m_prefix ), m_unit,
 aValue, wxEmptyString );
}


const wxString SCH_SYMBOL::GetFootprint( const SCH_SHEET_PATH* sheet, bool aResolve ) const
{
 KIID_PATH path = sheet->Path();

 for( const SYMBOL_INSTANCE_REFERENCE& instance : m_instanceReferences )
 {
 if( instance.m_Path == path && !instance.m_Footprint.IsEmpty() )
 {
 // This can only be an override from an Update Schematic from PCB, and therefore
 // will always be fully resolved.
 return instance.m_Footprint;
 }
 }

 if( !aResolve )
 return GetField( FOOTPRINT_FIELD )->GetText();

 return GetField( FOOTPRINT_FIELD )->GetShownText();
}


void SCH_SYMBOL::SetFootprint( const SCH_SHEET_PATH* sheet, const wxString& aFootprint )
{
 if( sheet == nullptr )
 {
 // Set all instances to new footprint value
 for( SYMBOL_INSTANCE_REFERENCE& instance : m_instanceReferences )
 instance.m_Footprint = aFootprint;

 m_fields[ FOOTPRINT_FIELD ].SetText( aFootprint );
 return;
 }

 KIID_PATH path = sheet->Path();

 // check to see if it is already there before inserting it
 for( SYMBOL_INSTANCE_REFERENCE& instance : m_instanceReferences )
 {
 if( instance.m_Path == path )
 {
 instance.m_Footprint = aFootprint;
 return;
 }
 }

 // didn't find it; better add it
 AddHierarchicalReference( path, UTIL::GetRefDesUnannotated( m_prefix ), m_unit,
 wxEmptyString, aFootprint );
}


SCH_FIELD* SCH_SYMBOL::GetField( MANDATORY_FIELD_T aFieldType )
{
 return &m_fields[aFieldType];
}


const SCH_FIELD* SCH_SYMBOL::GetField( MANDATORY_FIELD_T aFieldType ) const
{
 return &m_fields[aFieldType];
}


SCH_FIELD* SCH_SYMBOL::GetFieldById( int aFieldId )
{
 for( size_t ii = 0; ii < m_fields.size(); ++ii )
 {
 if( m_fields[ii].GetId() == aFieldId )
 return &m_fields[ii];
 }

 return nullptr;
}


wxString SCH_SYMBOL::GetFieldText( const wxString& aFieldName, SCH_EDIT_FRAME* aFrame ) const
{
 for( const SCH_FIELD& field : m_fields )
 {
 if( aFieldName == field.GetName() || aFieldName == field.GetCanonicalName() )
 return field.GetText();
 }

 return wxEmptyString;
}


void SCH_SYMBOL::GetFields( std::vector<SCH_FIELD*>& aVector, bool aVisibleOnly )
{
 for( SCH_FIELD& field : m_fields )
 {
 if( !aVisibleOnly || ( field.IsVisible() && !field.IsVoid() ) )
 aVector.push_back( &field );
 }
}


SCH_FIELD* SCH_SYMBOL::AddField( const SCH_FIELD& aField )
{
 int newNdx = m_fields.size();

 m_fields.push_back( aField );
 return &m_fields[newNdx];
}


void SCH_SYMBOL::RemoveField( const wxString& aFieldName )
{
 for( unsigned i = MANDATORY_FIELDS; i < m_fields.size(); ++i )
 {
 if( aFieldName == m_fields[i].GetName( false ) )
 {
 m_fields.erase( m_fields.begin() + i );
 return;
 }
 }
}


SCH_FIELD* SCH_SYMBOL::FindField( const wxString& aFieldName, bool aIncludeDefaultFields )
{
 unsigned start = aIncludeDefaultFields ? 0 : MANDATORY_FIELDS;

 for( unsigned i = start; i < m_fields.size(); ++i )
 {
 if( aFieldName == m_fields[i].GetName( false ) )
 return &m_fields[i];
 }

 return nullptr;
}


void SCH_SYMBOL::UpdateFields( const SCH_SHEET_PATH* aPath, bool aUpdateStyle, bool aUpdateRef,
 bool aUpdateOtherFields, bool aResetRef, bool aResetOtherFields )
{
 if( m_part )
 {
 wxString symbolName;
 std::vector<LIB_FIELD*> fields;

 m_part->GetFields( fields );

 for( const LIB_FIELD* libField : fields )
 {
 int id = libField->GetId();
 SCH_FIELD* schField;

 if( id >= 0 && id < MANDATORY_FIELDS )
 {
 schField = GetFieldById( id );
 }
 else
 {
 schField = FindField( libField->GetCanonicalName() );

 if( !schField )
 {
 wxString fieldName = libField->GetCanonicalName();
 SCH_FIELD newField( wxPoint( 0, 0), GetFieldCount(), this, fieldName );
 schField = AddField( newField );
 }
 }

 if( aUpdateStyle )
 {
 schField->ImportValues( *libField );
 schField->SetTextPos( m_pos + libField->GetTextPos() );
 }

 if( id == REFERENCE_FIELD && aPath )
 {
 if( aResetRef )
 SetRef( aPath, m_part->GetReferenceField().GetText() );
 else if( aUpdateRef )
 SetRef( aPath, libField->GetText() );
 }
 else if( id == VALUE_FIELD )
 {
 if( aResetOtherFields )
 SetValue( aPath, UnescapeString( m_lib_id.GetLibItemName() ) ); // alias-specific value
 else
 SetValue( aPath, UnescapeString( libField->GetText() ) );
 }
 else if( id == FOOTPRINT_FIELD )
 {
 if( aResetOtherFields || aUpdateOtherFields )
 SetFootprint( aPath, libField->GetText() );
 }
 else if( id == DATASHEET_FIELD )
 {
 if( aResetOtherFields )
 schField->SetText( GetDatasheet() ); // alias-specific value
 else if( aUpdateOtherFields )
 schField->SetText( libField->GetText() );
 }
 else
 {
 if( aResetOtherFields || aUpdateOtherFields )
 schField->SetText( libField->GetText() );
 }
 }
 }
}


void SCH_SYMBOL::RunOnChildren( const std::function<void( SCH_ITEM* )>& aFunction )
{
 for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
 aFunction( pin.get() );

 for( SCH_FIELD& field : m_fields )
 aFunction( &field );
}


SCH_PIN* SCH_SYMBOL::GetPin( const wxString& aNumber ) const
{
 for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
 {
 if( pin->GetNumber() == aNumber )
 return pin.get();
 }

 return nullptr;
}


void SCH_SYMBOL::GetLibPins( std::vector<LIB_PIN*>& aPinsList ) const
{
 if( m_part )
 m_part->GetPins( aPinsList, m_unit, m_convert );
}


SCH_PIN* SCH_SYMBOL::GetPin( LIB_PIN* aLibPin ) const
{
 wxASSERT( m_pinMap.count( aLibPin ) );
 return m_pins[ m_pinMap.at( aLibPin ) ].get();
}


std::vector<SCH_PIN*> SCH_SYMBOL::GetPins( const SCH_SHEET_PATH* aSheet ) const
{
 std::vector<SCH_PIN*> pins;

 if( aSheet == nullptr )
 {
 wxCHECK_MSG( Schematic(), pins, wxT( "Can't call GetPins on a symbol with no schematic" ) );

 aSheet = &Schematic()->CurrentSheet();
 }

 int unit = GetUnitSelection( aSheet );

 for( const auto& p : m_pins )
 {
 if( unit && p->GetLibPin()->GetUnit() && ( p->GetLibPin()->GetUnit() != unit ) )
 continue;

 pins.push_back( p.get() );
 }

 return pins;
}


void SCH_SYMBOL::SwapData( SCH_ITEM* aItem )
{
 wxCHECK_RET( (aItem != nullptr) && (aItem->Type() == SCH_SYMBOL_T),
 wxT( "Cannot swap data with invalid symbol." ) );

 SCH_SYMBOL* symbol = (SCH_SYMBOL*) aItem;

 std::swap( m_lib_id, symbol->m_lib_id );

 LIB_SYMBOL* libSymbol = symbol->m_part.release();
 symbol->m_part.reset( m_part.release() );
 symbol->UpdatePins();
 m_part.reset( libSymbol );
 UpdatePins();

 std::swap( m_pos, symbol->m_pos );
 std::swap( m_unit, symbol->m_unit );
 std::swap( m_convert, symbol->m_convert );

 m_fields.swap( symbol->m_fields ); // std::vector's swap()

 for( SCH_FIELD& field : symbol->m_fields )
 field.SetParent( symbol );

 for( SCH_FIELD& field : m_fields )
 field.SetParent( this );

 TRANSFORM tmp = m_transform;

 m_transform = symbol->m_transform;
 symbol->m_transform = tmp;

 std::swap( m_instanceReferences, symbol->m_instanceReferences );
 std::swap( m_schLibSymbolName, symbol->m_schLibSymbolName );
}


void SCH_SYMBOL::GetContextualTextVars( wxArrayString* aVars ) const
{
 for( int i = 0; i < MANDATORY_FIELDS; ++i )
 aVars->push_back( m_fields[i].GetCanonicalName().Upper() );

 for( size_t i = MANDATORY_FIELDS; i < m_fields.size(); ++i )
 aVars->push_back( m_fields[i].GetName() );

 aVars->push_back( wxT( "FOOTPRINT_LIBRARY" ) );
 aVars->push_back( wxT( "FOOTPRINT_NAME" ) );
 aVars->push_back( wxT( "UNIT" ) );
}


bool SCH_SYMBOL::ResolveTextVar( wxString* token, int aDepth ) const
{
 SCHEMATIC* schematic = Schematic();

 // SCH_SYMOL object has no context outside a schematic.
 wxCHECK( schematic, false );

 for( int i = 0; i < MANDATORY_FIELDS; ++i )
 {
 if( token->IsSameAs( m_fields[ i ].GetCanonicalName().Upper() ) )
 {
 if( i == REFERENCE_FIELD )
 *token = GetRef( &schematic->CurrentSheet(), true );
 else if( i == VALUE_FIELD )
 *token = GetValue( &schematic->CurrentSheet(), true );
 else if( i == FOOTPRINT_FIELD )
 *token = GetFootprint( &schematic->CurrentSheet(), true );
 else
 *token = m_fields[ i ].GetShownText( aDepth + 1 );

 return true;
 }
 }

 for( size_t i = MANDATORY_FIELDS; i < m_fields.size(); ++i )
 {
 if( token->IsSameAs( m_fields[ i ].GetName() )
 || token->IsSameAs( m_fields[ i ].GetName().Upper() ) )
 {
 *token = m_fields[ i ].GetShownText( aDepth + 1 );
 return true;
 }
 }

 for( const TEMPLATE_FIELDNAME& templateFieldname :
 schematic->Settings().m_TemplateFieldNames.GetTemplateFieldNames() )
 {
 if( token->IsSameAs( templateFieldname.m_Name )
 || token->IsSameAs( templateFieldname.m_Name.Upper() ) )
 {
 // If we didn't find it in the fields list then it isn't set on this symbol.
 // Just return an empty string.
 *token = wxEmptyString;
 return true;
 }
 }

 if( token->IsSameAs( wxT( "FOOTPRINT_LIBRARY" ) ) )
 {
 wxString footprint;

 footprint = GetFootprint( &schematic->CurrentSheet(), true );

 wxArrayString parts = wxSplit( footprint, ':' );

 *token = parts[ 0 ];
 return true;
 }
 else if( token->IsSameAs( wxT( "FOOTPRINT_NAME" ) ) )
 {
 wxString footprint;

 footprint = GetFootprint( &schematic->CurrentSheet(), true );

 wxArrayString parts = wxSplit( footprint, ':' );

 *token = parts[ std::min( 1, (int) parts.size() - 1 ) ];
 return true;
 }
 else if( token->IsSameAs( wxT( "UNIT" ) ) )
 {
 int unit;

 unit = GetUnitSelection( &schematic->CurrentSheet() );

 *token = LIB_SYMBOL::SubReference( unit );
 return true;
 }

 return false;
}


void SCH_SYMBOL::ClearAnnotation( const SCH_SHEET_PATH* aSheetPath )
{
 // Build a reference with no annotation, i.e. a reference ending with a single '?'
 wxString defRef = UTIL::GetRefDesUnannotated( m_prefix );

 if( aSheetPath )
 {
 KIID_PATH path = aSheetPath->Path();

 for( SYMBOL_INSTANCE_REFERENCE& instance : m_instanceReferences )
 {
 if( instance.m_Path == path )
 instance.m_Reference = defRef;
 }
 }
 else
 {
 for( SYMBOL_INSTANCE_REFERENCE& instance : m_instanceReferences )
 instance.m_Reference = defRef;
 }

 for( std::unique_ptr<SCH_PIN>& pin : m_pins )
 pin->ClearDefaultNetName( aSheetPath );

 // These 2 changes do not work in complex hierarchy.
 // When a clear annotation is made, the calling function must call a
 // UpdateAllScreenReferences for the active sheet.
 // But this call cannot made here.
 m_fields[REFERENCE_FIELD].SetText( defRef ); //for drawing.
}


bool SCH_SYMBOL::AddSheetPathReferenceEntryIfMissing( const KIID_PATH& aSheetPath )
{
 // a empty sheet path is illegal:
 wxCHECK( aSheetPath.size() > 0, false );

 wxString reference_path;

 for( const SYMBOL_INSTANCE_REFERENCE& instance : m_instanceReferences )
 {
 // if aSheetPath is found, nothing to do:
 if( instance.m_Path == aSheetPath )
 return false;
 }

 // This entry does not exist: add it, with its last-used reference
 AddHierarchicalReference( aSheetPath, m_fields[REFERENCE_FIELD].GetText(), m_unit );
 return true;
}


bool SCH_SYMBOL::ReplaceInstanceSheetPath( const KIID_PATH& aOldSheetPath,
 const KIID_PATH& aNewSheetPath )
{
 auto it = std::find_if( m_instanceReferences.begin(), m_instanceReferences.end(),
 [ aOldSheetPath ]( SYMBOL_INSTANCE_REFERENCE& r )->bool
 {
 return aOldSheetPath == r.m_Path;
 }
 );

 if( it != m_instanceReferences.end() )
 {
 wxLogTrace( traceSchSheetPaths,
 wxT( "Replacing sheet path %s\n with sheet path %s\n for symbol %s." ),
 aOldSheetPath.AsString(), aNewSheetPath.AsString(), m_Uuid.AsString() );

 it->m_Path = aNewSheetPath;
 return true;
 }

 wxLogTrace( traceSchSheetPaths,
 wxT( "Could not find sheet path %s\n to replace with sheet path %s\n for symbol %s." ),
 aOldSheetPath.AsString(), aNewSheetPath.AsString(), m_Uuid.AsString() );

 return false;
}


void SCH_SYMBOL::SetOrientation( int aOrientation )
{
 TRANSFORM temp = TRANSFORM();
 bool transform = false;

 switch( aOrientation )
 {
 case SYM_ORIENT_0:
 case SYM_NORMAL: // default transform matrix
 m_transform.x1 = 1;
 m_transform.y2 = -1;
 m_transform.x2 = m_transform.y1 = 0;
 break;

 case SYM_ROTATE_COUNTERCLOCKWISE: // Rotate + (incremental rotation)
 temp.x1 = temp.y2 = 0;
 temp.y1 = 1;
 temp.x2 = -1;
 transform = true;
 break;

 case SYM_ROTATE_CLOCKWISE: // Rotate - (incremental rotation)
 temp.x1 = temp.y2 = 0;
 temp.y1 = -1;
 temp.x2 = 1;
 transform = true;
 break;

 case SYM_MIRROR_Y: // Mirror Y (incremental rotation)
 temp.x1 = -1;
 temp.y2 = 1;
 temp.y1 = temp.x2 = 0;
 transform = true;
 break;

 case SYM_MIRROR_X: // Mirror X (incremental rotation)
 temp.x1 = 1;
 temp.y2 = -1;
 temp.y1 = temp.x2 = 0;
 transform = true;
 break;

 case SYM_ORIENT_90:
 SetOrientation( SYM_ORIENT_0 );
 SetOrientation( SYM_ROTATE_COUNTERCLOCKWISE );
 break;

 case SYM_ORIENT_180:
 SetOrientation( SYM_ORIENT_0 );
 SetOrientation( SYM_ROTATE_COUNTERCLOCKWISE );
 SetOrientation( SYM_ROTATE_COUNTERCLOCKWISE );
 break;

 case SYM_ORIENT_270:
 SetOrientation( SYM_ORIENT_0 );
 SetOrientation( SYM_ROTATE_CLOCKWISE );
 break;

 case ( SYM_ORIENT_0 + SYM_MIRROR_X ):
 SetOrientation( SYM_ORIENT_0 );
 SetOrientation( SYM_MIRROR_X );
 break;

 case ( SYM_ORIENT_0 + SYM_MIRROR_Y ):
 SetOrientation( SYM_ORIENT_0 );
 SetOrientation( SYM_MIRROR_Y );
 break;

 case ( SYM_ORIENT_90 + SYM_MIRROR_X ):
 SetOrientation( SYM_ORIENT_90 );
 SetOrientation( SYM_MIRROR_X );
 break;

 case ( SYM_ORIENT_90 + SYM_MIRROR_Y ):
 SetOrientation( SYM_ORIENT_90 );
 SetOrientation( SYM_MIRROR_Y );
 break;

 case ( SYM_ORIENT_180 + SYM_MIRROR_X ):
 SetOrientation( SYM_ORIENT_180 );
 SetOrientation( SYM_MIRROR_X );
 break;

 case ( SYM_ORIENT_180 + SYM_MIRROR_Y ):
 SetOrientation( SYM_ORIENT_180 );
 SetOrientation( SYM_MIRROR_Y );
 break;

 case ( SYM_ORIENT_270 + SYM_MIRROR_X ):
 SetOrientation( SYM_ORIENT_270 );
 SetOrientation( SYM_MIRROR_X );
 break;

 case ( SYM_ORIENT_270 + SYM_MIRROR_Y ):
 SetOrientation( SYM_ORIENT_270 );
 SetOrientation( SYM_MIRROR_Y );
 break;

 default:
 transform = false;
 wxFAIL_MSG( wxT( "Invalid schematic symbol orientation type." ) );
 break;
 }

 if( transform )
 {
 /* The new matrix transform is the old matrix transform modified by the
 * requested transformation, which is the temp transform (rot,
 * mirror ..) in order to have (in term of matrix transform):
 * transform coord = new_m_transform * coord
 * where transform coord is the coord modified by new_m_transform from
 * the initial value coord.
 * new_m_transform is computed (from old_m_transform and temp) to
 * have:
 * transform coord = old_m_transform * temp
 */
 TRANSFORM newTransform;

 newTransform.x1 = m_transform.x1 * temp.x1 + m_transform.x2 * temp.y1;
 newTransform.y1 = m_transform.y1 * temp.x1 + m_transform.y2 * temp.y1;
 newTransform.x2 = m_transform.x1 * temp.x2 + m_transform.x2 * temp.y2;
 newTransform.y2 = m_transform.y1 * temp.x2 + m_transform.y2 * temp.y2;
 m_transform = newTransform;
 }
}


int SCH_SYMBOL::GetOrientation()
{
 int rotate_values[] =
 {
 SYM_ORIENT_0,
 SYM_ORIENT_90,
 SYM_ORIENT_180,
 SYM_ORIENT_270,
 SYM_MIRROR_X + SYM_ORIENT_0,
 SYM_MIRROR_X + SYM_ORIENT_90,
 SYM_MIRROR_X + SYM_ORIENT_270,
 SYM_MIRROR_Y,
 SYM_MIRROR_Y + SYM_ORIENT_0,
 SYM_MIRROR_Y + SYM_ORIENT_90,
 SYM_MIRROR_Y + SYM_ORIENT_180,
 SYM_MIRROR_Y + SYM_ORIENT_270
 };

 // Try to find the current transform option:
 TRANSFORM transform = m_transform;

 for( int type_rotate : rotate_values )
 {
 SetOrientation( type_rotate );

 if( transform == m_transform )
 return type_rotate;
 }

 // Error: orientation not found in list (should not happen)
 wxFAIL_MSG( wxT( "Schematic symbol orientation matrix internal error." ) );
 m_transform = transform;

 return SYM_NORMAL;
}


#if defined(DEBUG)

void SCH_SYMBOL::Show( int nestLevel, std::ostream& os ) const
{
 // for now, make it look like XML:
 NestedSpace( nestLevel, os ) << '<' << GetClass().Lower().mb_str()
 << " ref=\"" << TO_UTF8( GetField( REFERENCE_FIELD )->GetName() )
 << '"' << " chipName=\""
 << GetLibId().Format() << '"' << m_pos
  << " layer=\"" << m_layer
 << '"' << ">\n";

 // skip the reference, it's been output already.
 for( int i = 1; i < GetFieldCount(); ++i )
 {
 const wxString& value = GetFields()[i].GetText();

 if( !value.IsEmpty() )
 {
 NestedSpace( nestLevel + 1, os ) << "<field" << " name=\""
 << TO_UTF8( GetFields()[i].GetName() )
 << '"' << " value=\""
 << TO_UTF8( value ) << "\"/>\n";
 }
 }

 NestedSpace( nestLevel, os ) << "</" << TO_UTF8( GetClass().Lower() ) << ">\n";
}

#endif


EDA_RECT SCH_SYMBOL::doGetBoundingBox( bool aIncludePins, bool aIncludeFields ) const
{
 EDA_RECT bBox;

 if( m_part )
 bBox = m_part->GetBodyBoundingBox( m_unit, m_convert, aIncludePins );
 else
 bBox = dummy()->GetBodyBoundingBox( m_unit, m_convert, aIncludePins );

 int x0 = bBox.GetX();
 int xm = bBox.GetRight();

 // We must reverse Y values, because matrix orientation
 // suppose Y axis normal for the library items coordinates,
 // m_transform reverse Y values, but bBox is already reversed!
 int y0 = -bBox.GetY();
 int ym = -bBox.GetBottom();

 // Compute the real Boundary box (rotated, mirrored ...)
 int x1 = m_transform.x1 * x0 + m_transform.y1 * y0;
 int y1 = m_transform.x2 * x0 + m_transform.y2 * y0;
 int x2 = m_transform.x1 * xm + m_transform.y1 * ym;
 int y2 = m_transform.x2 * xm + m_transform.y2 * ym;

 bBox.SetX( x1 );
 bBox.SetY( y1 );
 bBox.SetWidth( x2 - x1 );
 bBox.SetHeight( y2 - y1 );
 bBox.Normalize();

 bBox.Offset( m_pos );

 if( aIncludeFields )
 {
 for( const SCH_FIELD& field : m_fields )
 {
 if( field.IsVisible() )
 bBox.Merge( field.GetBoundingBox() );
 }
 }

 return bBox;
}


EDA_RECT SCH_SYMBOL::GetBodyBoundingBox() const
{
 return doGetBoundingBox( false, false );
}


EDA_RECT SCH_SYMBOL::GetBodyAndPinsBoundingBox() const
{
 return doGetBoundingBox( true, false );
}


const EDA_RECT SCH_SYMBOL::GetBoundingBox() const
{
 return doGetBoundingBox( true, true );
}


void SCH_SYMBOL::GetMsgPanelInfo( EDA_DRAW_FRAME* aFrame, std::vector<MSG_PANEL_ITEM>& aList )
{
 wxString msg;

 SCH_EDIT_FRAME* schframe = dynamic_cast<SCH_EDIT_FRAME*>( aFrame );
 SCH_SHEET_PATH* currentSheet = schframe ? &schframe->GetCurrentSheet() : nullptr;

 // part and alias can differ if alias is not the root
 if( m_part )
 {
 if( m_part.get() != dummy() )
 {
 aList.emplace_back( _( "Reference" ), GetRef( currentSheet ) );

 msg = m_part->IsPower() ? _( "Power symbol" ) : _( "Value" );
 aList.emplace_back( msg, GetValue( currentSheet, true ) );

#if 0 // Display symbol flags, for debug only
 aList.emplace_back( _( "flags" ), wxString::Format( "%X", GetEditFlags() ) );
#endif

 // Display symbol reference in library and library
 aList.emplace_back( _( "Name" ), UnescapeString( GetLibId().GetLibItemName() ) );

 if( !m_part->IsRoot() )
 {
 msg = _( "Missing parent" );

 std::shared_ptr< LIB_SYMBOL > parent = m_part->GetParent().lock();

 if( parent )
 msg = parent->GetName();

 aList.emplace_back( _( "Alias of" ), UnescapeString( msg ) );
 }
 else if( !m_lib_id.GetLibNickname().empty() )
 {
 aList.emplace_back( _( "Library" ), m_lib_id.GetLibNickname() );
 }
 else
 {
 aList.emplace_back( _( "Library" ), _( "Undefined!!!" ) );
 }

 // Display the current associated footprint, if exists.
 msg = GetFootprint( currentSheet, true );

 if( msg.IsEmpty() )
 msg = _( "<Unknown>" );

 aList.emplace_back( _( "Footprint" ), msg );

 // Display description of the symbol, and keywords found in lib
 aList.emplace_back( _( "Description" ), m_part->GetDescription() );
 aList.emplace_back( _( "Keywords" ), m_part->GetKeyWords() );
 }
 }
 else
 {
 aList.emplace_back( _( "Reference" ), GetRef( currentSheet ) );

 aList.emplace_back( _( "Value" ), GetValue( currentSheet, true ) );
 aList.emplace_back( _( "Name" ), GetLibId().GetLibItemName() );

 wxString libNickname = GetLibId().GetLibNickname();

 if( libNickname.empty() )
 msg = _( "No library defined!" );
 else
 msg.Printf( _( "Symbol not found in %s!" ), libNickname );

 aList.emplace_back( _( "Library" ), msg );
 }
}


BITMAPS SCH_SYMBOL::GetMenuImage() const
{
 return BITMAPS::add_component;
}


void SCH_SYMBOL::MirrorHorizontally( int aCenter )
{
 int dx = m_pos.x;

 SetOrientation( SYM_MIRROR_Y );
 MIRROR( m_pos.x, aCenter );
 dx -= m_pos.x; // dx,0 is the move vector for this transform

 for( SCH_FIELD& field : m_fields )
 {
 // Move the fields to the new position because the symbol itself has moved.
 wxPoint pos = field.GetTextPos();
 pos.x -= dx;
 field.SetTextPos( pos );
 }
}


void SCH_SYMBOL::MirrorVertically( int aCenter )
{
 int dy = m_pos.y;

 SetOrientation( SYM_MIRROR_X );
 MIRROR( m_pos.y, aCenter );
 dy -= m_pos.y; // 0,dy is the move vector for this transform

 for( SCH_FIELD& field : m_fields )
 {
 // Move the fields to the new position because the symbol itself has moved.
 wxPoint pos = field.GetTextPos();
 pos.y -= dy;
 field.SetTextPos( pos );
 }
}


void SCH_SYMBOL::Rotate( const wxPoint& aCenter )
{
 wxPoint prev = m_pos;

 RotatePoint( &m_pos, aCenter, 900 );

 SetOrientation( SYM_ROTATE_COUNTERCLOCKWISE );

 for( SCH_FIELD& field : m_fields )
 {
 // Move the fields to the new position because the symbol itself has moved.
 wxPoint pos = field.GetTextPos();
 pos.x -= prev.x - m_pos.x;
 pos.y -= prev.y - m_pos.y;
 field.SetTextPos( pos );
 }
}


bool SCH_SYMBOL::Matches( const wxFindReplaceData& aSearchData, void* aAuxData ) const
{
 wxLogTrace( traceFindItem, wxT( " item " ) + GetSelectMenuText( EDA_UNITS::MILLIMETRES ) );

 // Symbols are searchable via the child field and pin item text.
 return false;
}


void SCH_SYMBOL::GetEndPoints( std::vector <DANGLING_END_ITEM>& aItemList )
{
 for( auto& pin : m_pins )
 {
 LIB_PIN* lib_pin = pin->GetLibPin();

 if( lib_pin->GetUnit() && m_unit && ( m_unit != lib_pin->GetUnit() ) )
 continue;

 DANGLING_END_ITEM item( PIN_END, lib_pin, GetPinPhysicalPosition( lib_pin ), this );
 aItemList.push_back( item );
 }
}


bool SCH_SYMBOL::UpdateDanglingState( std::vector<DANGLING_END_ITEM>& aItemList,
 const SCH_SHEET_PATH* aPath )
{
 bool changed = false;

 for( std::unique_ptr<SCH_PIN>& pin : m_pins )
 {
 bool previousState = pin->IsDangling();
 pin->SetIsDangling( true );

 wxPoint pos = m_transform.TransformCoordinate( pin->GetLocalPosition() ) + m_pos;

 for( DANGLING_END_ITEM& each_item : aItemList )
 {
 // Some people like to stack pins on top of each other in a symbol to indicate
 // internal connection. While technically connected, it is not particularly useful
 // to display them that way, so skip any pins that are in the same symbol as this
 // one.
 if( each_item.GetParent() == this )
 continue;

 switch( each_item.GetType() )
 {
 case PIN_END:
 case LABEL_END:
 case SHEET_LABEL_END:
 case WIRE_END:
 case NO_CONNECT_END:
 case JUNCTION_END:

 if( pos == each_item.GetPosition() )
 pin->SetIsDangling( false );

 break;

 default:
 break;
 }

 if( !pin->IsDangling() )
 break;
 }

 changed = ( changed || ( previousState != pin->IsDangling() ) );
 }

 return changed;
}


wxPoint SCH_SYMBOL::GetPinPhysicalPosition( const LIB_PIN* Pin ) const
{
 wxCHECK_MSG( Pin != nullptr && Pin->Type() == LIB_PIN_T, wxPoint( 0, 0 ),
 wxT( "Cannot get physical position of pin." ) );

 return m_transform.TransformCoordinate( Pin->GetPosition() ) + m_pos;
}


std::vector<wxPoint> SCH_SYMBOL::GetConnectionPoints() const
{
 std::vector<wxPoint> retval;

 for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
 {
 // Collect only pins attached to the current unit and convert.
 // others are not associated to this symbol instance
 int pin_unit = pin->GetLibPin()->GetUnit();
 int pin_convert = pin->GetLibPin()->GetConvert();

 if( pin_unit > 0 && pin_unit != GetUnit() )
 continue;

 if( pin_convert > 0 && pin_convert != GetConvert() )
 continue;

 retval.push_back( m_transform.TransformCoordinate( pin->GetLocalPosition() ) + m_pos );
 }

 return retval;
}


LIB_ITEM* SCH_SYMBOL::GetDrawItem( const wxPoint& aPosition, KICAD_T aType )
{
 if( m_part )
 {
 // Calculate the position relative to the symbol.
 wxPoint libPosition = aPosition - m_pos;

 return m_part->LocateDrawItem( m_unit, m_convert, aType, libPosition, m_transform );
 }

 return nullptr;
}


wxString SCH_SYMBOL::GetSelectMenuText( EDA_UNITS aUnits ) const
{
 return wxString::Format( _( "Symbol %s [%s]" ),
 GetField( REFERENCE_FIELD )->GetShownText(),
 UnescapeString( GetLibId().GetLibItemName() ) );
}


SEARCH_RESULT SCH_SYMBOL::Visit( INSPECTOR aInspector, void* aTestData,
 const KICAD_T aFilterTypes[] )
{
 KICAD_T stype;

 for( const KICAD_T* p = aFilterTypes; (stype = *p) != EOT; ++p )
 {
 if( stype == SCH_LOCATE_ANY_T
 || ( stype == SCH_SYMBOL_T )
 || ( stype == SCH_SYMBOL_LOCATE_POWER_T && m_part && m_part->IsPower() ) )
 {
 if( SEARCH_RESULT::QUIT == aInspector( this, aTestData ) )
 return SEARCH_RESULT::QUIT;
 }

 if( stype == SCH_LOCATE_ANY_T || stype == SCH_FIELD_T )
 {
 for( SCH_FIELD& field : m_fields )
 {
 if( SEARCH_RESULT::QUIT == aInspector( &field, (void*) this ) )
 return SEARCH_RESULT::QUIT;
 }
 }

 if( stype == SCH_FIELD_LOCATE_REFERENCE_T )
 {
 if( SEARCH_RESULT::QUIT == aInspector( GetField( REFERENCE_FIELD ), (void*) this ) )
 return SEARCH_RESULT::QUIT;
 }

 if( stype == SCH_FIELD_LOCATE_VALUE_T
 || ( stype == SCH_SYMBOL_LOCATE_POWER_T && m_part && m_part->IsPower() ) )
 {
 if( SEARCH_RESULT::QUIT == aInspector( GetField( VALUE_FIELD ), (void*) this ) )
 return SEARCH_RESULT::QUIT;
 }

 if( stype == SCH_FIELD_LOCATE_FOOTPRINT_T )
 {
 if( SEARCH_RESULT::QUIT == aInspector( GetField( FOOTPRINT_FIELD ), (void*) this ) )
 return SEARCH_RESULT::QUIT;
 }

 if( stype == SCH_FIELD_LOCATE_DATASHEET_T )
 {
 if( SEARCH_RESULT::QUIT == aInspector( GetField( DATASHEET_FIELD ), (void*) this ) )
 return SEARCH_RESULT::QUIT;
 }

 if( stype == SCH_LOCATE_ANY_T || stype == SCH_PIN_T )
 {
 for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
 {
 // Collect only pins attached to the current unit and convert.
 // others are not associated to this symbol instance
 int pin_unit = pin->GetLibPin()->GetUnit();
 int pin_convert = pin->GetLibPin()->GetConvert();

 if( pin_unit > 0 && pin_unit != GetUnit() )
 continue;

 if( pin_convert > 0 && pin_convert != GetConvert() )
 continue;

 if( SEARCH_RESULT::QUIT == aInspector( pin.get(), (void*) this ) )
 return SEARCH_RESULT::QUIT;
 }
 }
 }

 return SEARCH_RESULT::CONTINUE;
}


bool SCH_SYMBOL::operator <( const SCH_ITEM& aItem ) const
{
 if( Type() != aItem.Type() )
 return Type() < aItem.Type();

 auto symbol = static_cast<const SCH_SYMBOL*>( &aItem );

 EDA_RECT rect = GetBodyAndPinsBoundingBox();

 if( rect.GetArea() != symbol->GetBodyAndPinsBoundingBox().GetArea() )
 return rect.GetArea() < symbol->GetBodyAndPinsBoundingBox().GetArea();

 if( m_pos.x != symbol->m_pos.x )
 return m_pos.x < symbol->m_pos.x;

 if( m_pos.y != symbol->m_pos.y )
 return m_pos.y < symbol->m_pos.y;

 return m_Uuid < aItem.m_Uuid; // Ensure deterministic sort
}


bool SCH_SYMBOL::operator==( const SCH_SYMBOL& aSymbol ) const
{
 if( GetFieldCount() != aSymbol.GetFieldCount() )
 return false;

 for( int i = VALUE_FIELD; i < GetFieldCount(); i++ )
 {
 if( GetFields()[i].GetText().Cmp( aSymbol.GetFields()[i].GetText() ) != 0 )
 return false;
 }

 return true;
}


bool SCH_SYMBOL::operator!=( const SCH_SYMBOL& aSymbol ) const
{
 return !( *this == aSymbol );
}


SCH_SYMBOL& SCH_SYMBOL::operator=( const SCH_ITEM& aItem )
{
 wxCHECK_MSG( Type() == aItem.Type(), *this,
 wxT( "Cannot assign object type " ) + aItem.GetClass() + wxT( " to type " ) +
 GetClass() );

 if( &aItem != this )
 {
 SCH_ITEM::operator=( aItem );

 SCH_SYMBOL* c = (SCH_SYMBOL*) &aItem;

 m_lib_id = c->m_lib_id;

 LIB_SYMBOL* libSymbol = c->m_part ? new LIB_SYMBOL( *c->m_part.get() ) : nullptr;

 m_part.reset( libSymbol );
 m_pos = c->m_pos;
 m_unit = c->m_unit;
 m_convert = c->m_convert;
 m_transform = c->m_transform;

 m_instanceReferences = c->m_instanceReferences;

 m_fields = c->m_fields; // std::vector's assignment operator

 // Reparent fields after assignment to new symbol.
 for( SCH_FIELD& field : m_fields )
 field.SetParent( this );

 UpdatePins();
 }

 return *this;
}


bool SCH_SYMBOL::HitTest( const wxPoint& aPosition, int aAccuracy ) const
{
 EDA_RECT bBox = GetBodyBoundingBox();
 bBox.Inflate( aAccuracy / 2 );

 if( bBox.Contains( aPosition ) )
 return true;

 return false;
}


bool SCH_SYMBOL::HitTest( const EDA_RECT& aRect, bool aContained, int aAccuracy ) const
{
 if( m_flags & STRUCT_DELETED || m_flags & SKIP_STRUCT )
 return false;

 EDA_RECT rect = aRect;

 rect.Inflate( aAccuracy / 2 );

 if( aContained )
 return rect.Contains( GetBodyBoundingBox() );

 return rect.Intersects( GetBodyBoundingBox() );
}


bool SCH_SYMBOL::doIsConnected( const wxPoint& aPosition ) const
{
 wxPoint new_pos = m_transform.InverseTransform().TransformCoordinate( aPosition - m_pos );

 for( const auto& pin : m_pins )
 {
 if( pin->GetType() == ELECTRICAL_PINTYPE::PT_NC )
 continue;

 // Collect only pins attached to the current unit and convert.
 // others are not associated to this symbol instance
 int pin_unit = pin->GetLibPin()->GetUnit();
 int pin_convert = pin->GetLibPin()->GetConvert();

 if( pin_unit > 0 && pin_unit != GetUnit() )
 continue;

 if( pin_convert > 0 && pin_convert != GetConvert() )
 continue;

 if( pin->GetLocalPosition() == new_pos )
 return true;
 }

 return false;
}


bool SCH_SYMBOL::IsInNetlist() const
{
 return m_isInNetlist;
}


void SCH_SYMBOL::Plot( PLOTTER* aPlotter ) const
{
 if( m_part )
 {
 LIB_PINS libPins;
 m_part->GetPins( libPins, GetUnit(), GetConvert() );

 // Copy the source so we can re-orient and translate it.
 LIB_SYMBOL tempSymbol( *m_part );
 LIB_PINS tempPins;
 tempSymbol.GetPins( tempPins, GetUnit(), GetConvert() );

 // Copy the pin info from the symbol to the temp pins
 for( unsigned i = 0; i < tempPins.size(); ++ i )
 {
 SCH_PIN* symbolPin = GetPin( libPins[ i ] );
 LIB_PIN* tempPin = tempPins[ i ];

 tempPin->SetName( symbolPin->GetShownName() );
 tempPin->SetType( symbolPin->GetType() );
 tempPin->SetShape( symbolPin->GetShape() );

 if( symbolPin->IsDangling() )
 tempPin->SetFlags( IS_DANGLING );
 }

 TRANSFORM temp = GetTransform();
 aPlotter->StartBlock( nullptr );

 tempSymbol.Plot( aPlotter, GetUnit(), GetConvert(), m_pos, temp );

 for( SCH_FIELD field : m_fields )
 field.Plot( aPlotter );

 aPlotter->EndBlock( nullptr );
 }
}


bool SCH_SYMBOL::HasBrightenedPins()
{
 for( const auto& pin : m_pins )
 {
 if( pin->IsBrightened() )
 return true;
 }

 return false;
}


void SCH_SYMBOL::ClearBrightenedPins()
{
 for( auto& pin : m_pins )
 pin->ClearBrightened();
}


bool SCH_SYMBOL::IsPointClickableAnchor( const wxPoint& aPos ) const
{
 for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
 {
 int pin_unit = pin->GetLibPin()->GetUnit();
 int pin_convert = pin->GetLibPin()->GetConvert();

 if( pin_unit > 0 && pin_unit != GetUnit() )
 continue;

 if( pin_convert > 0 && pin_convert != GetConvert() )
 continue;

 if( pin->IsPointClickableAnchor( aPos ) )
 return true;
 }

 return false;
}