spread_footprints.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2019 Jean-Pierre Charras, [email protected]
 * Copyright (C) 2013 SoftPLC Corporation, Dick Hollenbeck <[email protected]>
 * Copyright (C) 2013 Wayne Stambaugh <[email protected]>
 *
 * Copyright (C) 1992-2022 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 <spread_footprints.h>
#include <algorithm>
#include <refdes_utils.h>
#include <string_utils.h>
#include <confirm.h>
#include <pcb_edit_frame.h>
#include <board.h>
#include <rectpack2d/finders_interface.h>
 
 
constexpr bool allow_flip = true;
 
using spaces_type = rectpack2D::empty_spaces<allow_flip, rectpack2D::default_empty_spaces>;
using rect_type = rectpack2D::output_rect_t<spaces_type>;
using rect_ptr = rect_type*;
using rect_vector = std::vector<rect_type>;
 
// Use 0.01 mm units to calculate placement, to avoid long calculation time
const int scale = (int) ( 0.01 * pcbIUScale.IU_PER_MM );
 
 
static bool compareFootprintsbyRef( FOOTPRINT* ref, FOOTPRINT* compare )
{
 const wxString& refPrefix = UTIL::GetRefDesPrefix( ref->GetReference() );
 const wxString& cmpPrefix = UTIL::GetRefDesPrefix( compare->GetReference() );
 
 if( refPrefix != cmpPrefix )
 {
 return refPrefix < cmpPrefix;
 }
 else
 {
 const int refInt = GetTrailingInt( ref->GetReference() );
 const int cmpInt = GetTrailingInt( compare->GetReference() );
 
 return refInt < cmpInt;
 }
 
 return false;
}
 
 
// Spread a list of rectangles inside a placement area
rectpack2D::rect_wh spreadRectangles( rect_vector& vecSubRects, int areaSizeX, int areaSizeY )
{
 areaSizeX /= scale;
 areaSizeY /= scale;
 
 rectpack2D::rect_wh result;
 
 int max_side = std::max( areaSizeX, areaSizeY );
 
 while( true )
 {
 bool anyUnsuccessful = false;
 const int discard_step = 1;
 
 auto report_successful = [&]( rect_type& )
 {
 return rectpack2D::callback_result::CONTINUE_PACKING;
 };
 
 auto report_unsuccessful = [&]( rect_type& r )
 {
 anyUnsuccessful = true;
 return rectpack2D::callback_result::ABORT_PACKING;
 };
 
 result = rectpack2D::find_best_packing<spaces_type>(
 vecSubRects,
 make_finder_input( max_side, discard_step, report_successful, report_unsuccessful,
 rectpack2D::flipping_option::DISABLED ) );
 
 if( anyUnsuccessful )
 {
 max_side = (int) ( max_side * 1.2 );
 continue;
 }
 
 break;
 }
 
 return result;
}
 
 
void SpreadFootprints( std::vector<FOOTPRINT*>* aFootprints, VECTOR2I aTargetBoxPosition,
 bool aGroupBySheet, int aComponentGap, int aGroupGap )
{
 using FpBBoxToFootprintsPair = std::pair<BOX2I, std::vector<FOOTPRINT*>>;
 using SheetBBoxToFootprintsMapPair =
 std::pair<BOX2I, std::map<VECTOR2I, FpBBoxToFootprintsPair>>;
 
 std::map<wxString, SheetBBoxToFootprintsMapPair> sheetsMap;
 std::vector<BOX2I> blockMap;
 
 // Fill in the maps
 for( FOOTPRINT* footprint : *aFootprints )
 {
 wxString path =
 aGroupBySheet ? footprint->GetPath().AsString().BeforeLast( '/' ) : wxS( "" );
 
 VECTOR2I size = footprint->GetBoundingBox( false, false ).GetSize();
 size.x += aComponentGap;
 size.y += aComponentGap;
 
 sheetsMap[path].second[size].second.push_back( footprint );
 }
 
 for( auto& [sheetPath, sheetPair] : sheetsMap )
 {
 auto& [sheet_bbox, sizeToFpMap] = sheetPair;
 
 for( auto& [fpSize, fpPair] : sizeToFpMap )
 {
 auto& [block_bbox, footprints] = fpPair;
 
 // Find optimal arrangement of same-size footprints
 
 double blockEstimateArea = (double) fpSize.x * fpSize.y * footprints.size();
 double initialSide = std::sqrt( blockEstimateArea );
 bool vertical = fpSize.x >= fpSize.y;
 
 int initialCountPerLine = footprints.size();
 
 const int singleLineRatio = 5;
 
 // Wrap the line if the ratio is not satisfied
 if( vertical )
 {
 if( ( fpSize.y * footprints.size() / fpSize.x ) > singleLineRatio )
 initialCountPerLine = initialSide / fpSize.y;
 }
 else
 {
 if( ( fpSize.x * footprints.size() / fpSize.y ) > singleLineRatio )
 initialCountPerLine = initialSide / fpSize.x;
 }
 
 int optimalCountPerLine = initialCountPerLine;
 int optimalRemainder = footprints.size() % optimalCountPerLine;
 
 if( optimalRemainder != 0 )
 {
 for( int i = std::max( 2, initialCountPerLine - 2 );
 i <= std::min( (int) footprints.size() - 2, initialCountPerLine + 2 ); i++ )
 {
 int r = footprints.size() % i;
 
 if( r == 0 || r >= optimalRemainder )
 {
 optimalCountPerLine = i;
 optimalRemainder = r;
 }
 }
 }
 
 std::sort( footprints.begin(), footprints.end(), compareFootprintsbyRef );
 
 // Arrange footprints in rows or columns (blocks)
 for( unsigned i = 0; i < footprints.size(); i++ )
 {
 FOOTPRINT* footprint = footprints[i];
 
 VECTOR2I position = fpSize / 2;
 
 if( vertical )
 {
 position.x += fpSize.x * ( i / optimalCountPerLine );
 position.y += fpSize.y * ( i % optimalCountPerLine );
 }
 else
 {
 position.x += fpSize.x * ( i % optimalCountPerLine );
 position.y += fpSize.y * ( i / optimalCountPerLine );
 }
 
 BOX2I old_fp_bbox = footprint->GetBoundingBox( false, false );
 footprint->Move( position - old_fp_bbox.GetOrigin() );
 
 BOX2I new_fp_bbox = footprint->GetBoundingBox( false, false );
 new_fp_bbox.Inflate( aComponentGap / 2 );
 block_bbox.Merge( new_fp_bbox );
 }
 }
 
 rect_vector vecSubRects;
 long long blocksArea = 0;
 
 // Fill in arrays for packing of blocks
 for( auto& [fpSize, fpPair] : sizeToFpMap )
 {
 auto& [block_bbox, footprints] = fpPair;
 
 vecSubRects.emplace_back( 0, 0, block_bbox.GetWidth() / scale,
 block_bbox.GetHeight() / scale, false );
 
 blocksArea += block_bbox.GetArea();
 }
 
 // Pack the blocks
 int areaSide = std::sqrt( blocksArea );
 spreadRectangles( vecSubRects, areaSide, areaSide );
 
 unsigned block_i = 0;
 
 // Move footprints to the new block locations
 for( auto& [fpSize, pair] : sizeToFpMap )
 {
 auto& [src_bbox, footprints] = pair;
 
 rect_type srect = vecSubRects[block_i];
 
 VECTOR2I target_pos( srect.x * scale, srect.y * scale );
 VECTOR2I target_size( srect.w * scale, srect.h * scale );
 
 // Avoid too large coordinates: Overlapping components
 // are better than out of screen components
 if( (uint64_t) target_pos.x + (uint64_t) target_size.x > INT_MAX / 2 )
 target_pos.x -= INT_MAX / 2;
 
 if( (uint64_t) target_pos.y + (uint64_t) target_size.y > INT_MAX / 2 )
 target_pos.y -= INT_MAX / 2;
 
 for( FOOTPRINT* footprint : footprints )
 {
 footprint->Move( target_pos - src_bbox.GetPosition() );
 sheet_bbox.Merge( footprint->GetBoundingBox( false, false ) );
 }
 
 block_i++;
 }
 }
 
 rect_vector vecSubRects;
 long long sheetsArea = 0;
 
 // Fill in arrays for packing of hierarchical sheet groups
 for( auto& [sheetPath, sheetPair] : sheetsMap )
 {
 auto& [sheet_bbox, sizeToFpMap] = sheetPair;
 BOX2I rect = sheet_bbox;
 
 // Add a margin around the sheet placement area:
 rect.Inflate( aGroupGap );
 
 vecSubRects.emplace_back( 0, 0, rect.GetWidth() / scale, rect.GetHeight() / scale, false );
 
 sheetsArea += sheet_bbox.GetArea();
 }
 
 // Pack the hierarchical sheet groups
 int areaSide = std::sqrt( sheetsArea );
 spreadRectangles( vecSubRects, areaSide, areaSide );
 
 unsigned srect_i = 0;
 
 // Move footprints to the new hierarchical sheet group locations
 for( auto& [sheetPath, sheetPair] : sheetsMap )
 {
 auto& [src_bbox, sizeToFpMap] = sheetPair;
 
 rect_type srect = vecSubRects[srect_i];
 
 VECTOR2I target_pos( srect.x * scale + aTargetBoxPosition.x,
 srect.y * scale + aTargetBoxPosition.y );
 VECTOR2I target_size( srect.w * scale, srect.h * scale );
 
 // Avoid too large coordinates: Overlapping components
 // are better than out of screen components
 if( (uint64_t) target_pos.x + (uint64_t) target_size.x > INT_MAX / 2 )
 target_pos.x -= INT_MAX / 2;
 
 if( (uint64_t) target_pos.y + (uint64_t) target_size.y > INT_MAX / 2 )
 target_pos.y -= INT_MAX / 2;
 
 for( auto& [fpSize, fpPair] : sizeToFpMap )
 {
 auto& [block_bbox, footprints] = fpPair;
 for( FOOTPRINT* footprint : footprints )
 {
 footprint->Move( target_pos - src_bbox.GetPosition() );
 }
 }
 
 srect_i++;
 }
}