convert_tool.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 1992-2021 KiCad Developers, see AUTHORS.txt for contributors.
 * @author Jon Evans <[email protected]>
 *
 * 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 <bitmaps.h>
#include <board.h>
#include <board_commit.h>
#include <board_design_settings.h>
#include <collectors.h>
#include <confirm.h>
#include <convert_basic_shapes_to_polygon.h>
#include <footprint.h>
#include <footprint_edit_frame.h>
#include <fp_shape.h>
#include <geometry/shape_compound.h>
#include <menus_helpers.h>
#include <pcb_edit_frame.h>
#include <pcb_shape.h>
#include <pcb_track.h>
#include <tool/tool_manager.h>
#include <tools/edit_tool.h>
#include <tools/pcb_actions.h>
#include <tools/pcb_selection_tool.h>
#include <trigo.h>
#include <zone.h>

#include "convert_tool.h"


CONVERT_TOOL::CONVERT_TOOL() :
 TOOL_INTERACTIVE( "pcbnew.Convert" ),
 m_selectionTool( nullptr ),
 m_menu( nullptr ),
 m_frame( nullptr )
{
}


CONVERT_TOOL::~CONVERT_TOOL()
{
 delete m_menu;
}


using S_C = SELECTION_CONDITIONS;
using P_S_C = PCB_SELECTION_CONDITIONS;


bool CONVERT_TOOL::Init()
{
 m_selectionTool = m_toolMgr->GetTool<PCB_SELECTION_TOOL>();
 m_frame = getEditFrame<PCB_BASE_FRAME>();

 // Create a context menu and make it available through selection tool
 m_menu = new CONDITIONAL_MENU( this );
 m_menu->SetIcon( BITMAPS::convert );
 m_menu->SetTitle( _( "Create from Selection" ) );

 static KICAD_T convertibleTracks[] = { PCB_TRACE_T, PCB_ARC_T, EOT };
 static KICAD_T zones[] = { PCB_ZONE_T, PCB_FP_ZONE_T, EOT };

 auto graphicLines = P_S_C::OnlyGraphicShapeTypes( { SHAPE_T::SEGMENT,
 SHAPE_T::RECT,
 SHAPE_T::CIRCLE,
 SHAPE_T::ARC } )
 && P_S_C::SameLayer();

 auto graphicToTrack = P_S_C::OnlyGraphicShapeTypes( { SHAPE_T::SEGMENT, SHAPE_T::ARC } );

 auto trackLines = S_C::MoreThan( 1 ) && S_C::OnlyTypes( convertibleTracks )
 && P_S_C::SameLayer();

 auto anyLines = graphicLines || trackLines;
 auto anyPolys = S_C::OnlyTypes( zones )
 || P_S_C::OnlyGraphicShapeTypes( { SHAPE_T::POLY, SHAPE_T::RECT } );

 auto lineToArc = S_C::Count( 1 )
 && ( P_S_C::OnlyGraphicShapeTypes( { SHAPE_T::SEGMENT } )
 || S_C::OnlyType( PCB_TRACE_T ) );

 auto showConvert = anyPolys || anyLines || lineToArc;
 auto canCreatePolyType = anyLines || anyPolys;
 auto canCreateTracks = anyPolys || graphicToTrack;

 m_menu->AddItem( PCB_ACTIONS::convertToPoly, canCreatePolyType );
 m_menu->AddItem( PCB_ACTIONS::convertToZone, canCreatePolyType );
 m_menu->AddItem( PCB_ACTIONS::convertToKeepout, canCreatePolyType );
 m_menu->AddItem( PCB_ACTIONS::convertToLines, anyPolys );

 // Currently the code exists, but tracks are not really existing in footprints
 // only segments on copper layers
 if( m_frame->IsType( FRAME_PCB_EDITOR ) )
 m_menu->AddItem( PCB_ACTIONS::convertToTracks, canCreateTracks );

 m_menu->AddItem( PCB_ACTIONS::convertToArc, lineToArc );

 CONDITIONAL_MENU& selToolMenu = m_selectionTool->GetToolMenu().GetMenu();
 selToolMenu.AddMenu( m_menu, showConvert, 100 );

 return true;
}


int CONVERT_TOOL::CreatePolys( const TOOL_EVENT& aEvent )
{
 FOOTPRINT* parentFootprint = nullptr;

 auto& selection = m_selectionTool->RequestSelection(
 []( const VECTOR2I& aPt, GENERAL_COLLECTOR& aCollector, PCB_SELECTION_TOOL* sTool )
 {
 for( int i = aCollector.GetCount() - 1; i >= 0; --i )
 {
 BOARD_ITEM* item = aCollector[i];

 switch( item->Type() )
 {
 case PCB_SHAPE_T:
 case PCB_FP_SHAPE_T:
 {
 PCB_SHAPE* shape = static_cast<PCB_SHAPE*>( item );

 switch( shape->GetShape() )
 {
 case SHAPE_T::SEGMENT:
 case SHAPE_T::RECT:
 case SHAPE_T::CIRCLE:
 case SHAPE_T::ARC:
 if( shape->GetStart() == shape->GetEnd() )
 aCollector.Remove( item );

 break;

 case SHAPE_T::POLY:
 break;

 default:
 aCollector.Remove( item );
 }

 break;
 }
 case PCB_TRACE_T:
 case PCB_ARC_T:
 break;

 case PCB_ZONE_T:
 case PCB_FP_ZONE_T:
 break;

 default:
 aCollector.Remove( item );
 }
 }
 } );

 if( selection.Empty() )
 return 0;

 PCB_LAYER_ID destLayer = m_frame->GetActiveLayer();
 SHAPE_POLY_SET polySet = makePolysFromSegs( selection.GetItems() );

 polySet.Append( makePolysFromRects( selection.GetItems() ) );

 polySet.Append( makePolysFromCircles( selection.GetItems() ) );

 polySet.Append( extractPolygons( selection.GetItems() ) );

 if( polySet.IsEmpty() )
 return 0;

 bool isFootprint = m_frame->IsType( FRAME_FOOTPRINT_EDITOR );

 if( isFootprint )
 {
 if( FP_SHAPE* graphic = dynamic_cast<FP_SHAPE*>( selection.Front() ) )
 parentFootprint = graphic->GetParentFootprint();
 else if( FP_ZONE* zone = dynamic_cast<FP_ZONE*>( selection.Front() ) )
 parentFootprint = static_cast<FOOTPRINT*>( zone->GetParent() );
 else
 wxFAIL_MSG( wxT( "Unimplemented footprint parent in CONVERT_TOOL::CreatePolys" ) );
 }

 BOARD_COMMIT commit( m_frame );

 // For now, we convert each outline in the returned shape to its own polygon
 std::vector<SHAPE_POLY_SET> polys;

 for( int i = 0; i < polySet.OutlineCount(); i++ )
 polys.emplace_back( SHAPE_POLY_SET( polySet.COutline( i ) ) );

 if( aEvent.IsAction( &PCB_ACTIONS::convertToPoly ) )
 {
 for( const SHAPE_POLY_SET& poly : polys )
 {
 PCB_SHAPE* graphic = isFootprint ? new FP_SHAPE( parentFootprint ) : new PCB_SHAPE;

 graphic->SetShape( SHAPE_T::POLY );
 graphic->SetFilled( false );
 graphic->SetWidth( poly.Outline( 0 ).Width() );
 graphic->SetLayer( destLayer );
 graphic->SetPolyShape( poly );

 commit.Add( graphic );
 }

 commit.Push( _( "Convert shapes to polygon" ) );
 }
 else
 {
 // Creating zone or keepout
 PCB_BASE_EDIT_FRAME* frame = getEditFrame<PCB_BASE_EDIT_FRAME>();
 BOARD_ITEM_CONTAINER* parent = frame->GetModel();
 ZONE_SETTINGS zoneInfo = frame->GetZoneSettings();

 bool nonCopper = IsNonCopperLayer( destLayer );
 zoneInfo.m_Layers.reset().set( destLayer );
 zoneInfo.m_Name.Empty();

 int ret;

 if( aEvent.IsAction( &PCB_ACTIONS::convertToKeepout ) )
 {
 zoneInfo.SetIsRuleArea( true );
 ret = InvokeRuleAreaEditor( frame, &zoneInfo );
 }
 else if( nonCopper )
 {
 zoneInfo.SetIsRuleArea( false );
 ret = InvokeNonCopperZonesEditor( frame, &zoneInfo );
 }
 else
 {
 zoneInfo.SetIsRuleArea( false );
 ret = InvokeCopperZonesEditor( frame, &zoneInfo );
 }

 if( ret == wxID_CANCEL )
 return 0;

 for( const SHAPE_POLY_SET& poly : polys )
 {
 ZONE* zone = isFootprint ? new FP_ZONE( parent ) : new ZONE( parent );

 *zone->Outline() = poly;
 zone->HatchBorder();

 zoneInfo.ExportSetting( *zone );

 commit.Add( zone );
 }

 commit.Push( _( "Convert shapes to zone" ) );
 }

 return 0;
}


SHAPE_POLY_SET CONVERT_TOOL::makePolysFromSegs( const std::deque<EDA_ITEM*>& aItems )
{
 // TODO: This code has a somewhat-similar purpose to ConvertOutlineToPolygon but is slightly
 // different, so this remains a separate algorithm. It might be nice to analyze the dfiferences
 // in requirements and refactor this.

 // Very tight epsilon used here to account for rounding errors in import, not sloppy drawing
 const int chainingEpsilonSquared = SEG::Square( 100 );

 SHAPE_POLY_SET poly;

 // Stores pairs of (anchor, item) where anchor == 0 -> SEG.A, anchor == 1 -> SEG.B
 std::map<VECTOR2I, std::vector<std::pair<int, EDA_ITEM*>>> connections;
 std::set<EDA_ITEM*> used;
 std::deque<EDA_ITEM*> toCheck;

 auto closeEnough =
 []( VECTOR2I aLeft, VECTOR2I aRight, unsigned aLimit )
 {
 return ( aLeft - aRight ).SquaredEuclideanNorm() <= aLimit;
 };

 auto findInsertionPoint =
 [&]( VECTOR2I aPoint ) -> VECTOR2I
 {
 if( connections.count( aPoint ) )
 return aPoint;

 for( const auto& candidatePair : connections )
 {
 if( closeEnough( aPoint, candidatePair.first, chainingEpsilonSquared ) )
 return candidatePair.first;
 }

 return aPoint;
 };

 for( EDA_ITEM* item : aItems )
 {
 if( OPT<SEG> seg = getStartEndPoints( item, nullptr ) )
 {
 toCheck.push_back( item );
 connections[findInsertionPoint( seg->A )].emplace_back( std::make_pair( 0, item ) );
 connections[findInsertionPoint( seg->B )].emplace_back( std::make_pair( 1, item ) );
 }
 }

 while( !toCheck.empty() )
 {
 EDA_ITEM* candidate = toCheck.front();
 toCheck.pop_front();

 if( used.count( candidate ) )
 continue;

 int width = -1;
 SHAPE_LINE_CHAIN outline;

 auto insert =
 [&]( EDA_ITEM* aItem, VECTOR2I aAnchor, bool aDirection )
 {
 if( aItem->Type() == PCB_ARC_T
 || ( ( aItem->Type() == PCB_SHAPE_T || aItem->Type() == PCB_FP_SHAPE_T )
 && static_cast<PCB_SHAPE*>( aItem )->GetShape() == SHAPE_T::ARC ) )
 {
 SHAPE_ARC arc;

 if( aItem->Type() == PCB_ARC_T )
 {
 std::shared_ptr<SHAPE> es =
 static_cast<PCB_ARC*>( aItem )->GetEffectiveShape();
 arc = *static_cast<SHAPE_ARC*>( es.get() );
 }
 else
 {
 PCB_SHAPE* ps = static_cast<PCB_SHAPE*>( aItem );
 arc = SHAPE_ARC( ps->GetStart(), ps->GetArcMid(), ps->GetEnd(),
 ps->GetWidth() );
 }

 if( aDirection )
 outline.Append( aAnchor == arc.GetP0() ? arc : arc.Reversed() );
 else
 outline.Insert( 0, aAnchor == arc.GetP0() ? arc : arc.Reversed() );
 }
 else
 {
 OPT<SEG> nextSeg = getStartEndPoints( aItem, &width );
 wxASSERT( nextSeg );

 VECTOR2I& point = ( aAnchor == nextSeg->A ) ? nextSeg->B : nextSeg->A;

 if( aDirection )
 outline.Append( point );
 else
 outline.Insert( 0, point );
 }
 };

 // aDirection == true for walking "right" and appending to the end of points
  // false for walking "left" and prepending to the beginning
 std::function<void( EDA_ITEM*, VECTOR2I, bool )> process =
 [&]( EDA_ITEM* aItem, VECTOR2I aAnchor, bool aDirection )
 {
 if( used.count( aItem ) )
 return;

 used.insert( aItem );

 insert( aItem, aAnchor, aDirection );

 OPT<SEG> anchors = getStartEndPoints( aItem, &width );
 wxASSERT( anchors );

 VECTOR2I nextAnchor = ( aAnchor == anchors->A ) ? anchors->B : anchors->A;

 for( std::pair<int, EDA_ITEM*> pair : connections[nextAnchor] )
 {
 if( pair.second == aItem )
 continue;

 process( pair.second, nextAnchor, aDirection );
 }
 };

 OPT<SEG> anchors = getStartEndPoints( candidate, &width );
 wxASSERT( anchors );

 // Start with the first object and walk "right"
 // Note if the first object is an arc, we don't need to insert its first point here, the
 // whole arc will be inserted at anchor B inside process()
 if( !( candidate->Type() == PCB_ARC_T
 || ( ( candidate->Type() == PCB_SHAPE_T || candidate->Type() == PCB_FP_SHAPE_T )
 && static_cast<PCB_SHAPE*>( candidate )->GetShape() == SHAPE_T::ARC ) ) )
 {
 insert( candidate, anchors->A, true );
 }

 process( candidate, anchors->B, true );

 // check for any candidates on the "left"
 EDA_ITEM* left = nullptr;

 for( std::pair<int, EDA_ITEM*> possibleLeft : connections[anchors->A] )
 {
 if( possibleLeft.second != candidate )
 {
 left = possibleLeft.second;
 break;
 }
 }

 if( left )
 process( left, anchors->A, false );

 if( outline.PointCount() < 3 )
 continue;

 outline.SetClosed( true );
 outline.Simplify();

 if( width >= 0 )
 outline.SetWidth( width );

 poly.AddOutline( outline );
 }

 return poly;
}


SHAPE_POLY_SET CONVERT_TOOL::makePolysFromRects( const std::deque<EDA_ITEM*>& aItems )
{
 SHAPE_POLY_SET poly;

 for( EDA_ITEM* item : aItems )
 {
 if( item->Type() != PCB_SHAPE_T && item->Type() != PCB_FP_SHAPE_T )
 continue;

 PCB_SHAPE* graphic = static_cast<PCB_SHAPE*>( item );

 if( graphic->GetShape() != SHAPE_T::RECT )
 continue;

 SHAPE_LINE_CHAIN outline;
 VECTOR2I start( graphic->GetStart() );
 VECTOR2I end( graphic->GetEnd() );

 outline.Append( start );
 outline.Append( VECTOR2I( end.x, start.y ) );
 outline.Append( end );
 outline.Append( VECTOR2I( start.x, end.y ) );
 outline.SetClosed( true );

 outline.SetWidth( graphic->GetWidth() );

 poly.AddOutline( outline );
 }

 return poly;
}


SHAPE_POLY_SET CONVERT_TOOL::makePolysFromCircles( const std::deque<EDA_ITEM*>& aItems )
{
 SHAPE_POLY_SET poly;

 for( EDA_ITEM* item : aItems )
 {
 if( item->Type() != PCB_SHAPE_T && item->Type() != PCB_FP_SHAPE_T )
 continue;

 PCB_SHAPE* graphic = static_cast<PCB_SHAPE*>( item );

 if( graphic->GetShape() != SHAPE_T::CIRCLE )
 continue;

 BOARD_DESIGN_SETTINGS& bds = graphic->GetBoard()->GetDesignSettings();
 SHAPE_LINE_CHAIN outline;

 TransformCircleToPolygon( outline, graphic->GetPosition(), graphic->GetRadius(),
 bds.m_MaxError, ERROR_OUTSIDE );

 poly.AddOutline( outline );
 }

 return poly;
}


SHAPE_POLY_SET CONVERT_TOOL::extractPolygons( const std::deque<EDA_ITEM*>& aItems )
{
 SHAPE_POLY_SET poly;

 for( EDA_ITEM* item : aItems )
 {
 switch( item->Type() )
 {
 case PCB_SHAPE_T:
 case PCB_FP_SHAPE_T:
 switch( static_cast<PCB_SHAPE*>( item )->GetShape() )
 {
 case SHAPE_T::POLY:
 poly.Append( static_cast<PCB_SHAPE*>( item )->GetPolyShape() );
 break;

 default:
 continue;
 }

 break;

 case PCB_ZONE_T:
 case PCB_FP_ZONE_T:
 poly.Append( *static_cast<ZONE*>( item )->Outline() );
 break;

 default:
 continue;
 }
 }

 return poly;
}


int CONVERT_TOOL::CreateLines( const TOOL_EVENT& aEvent )
{
 auto& selection = m_selectionTool->RequestSelection(
 []( const VECTOR2I& aPt, GENERAL_COLLECTOR& aCollector, PCB_SELECTION_TOOL* sTool )
 {
 for( int i = aCollector.GetCount() - 1; i >= 0; --i )
 {
 BOARD_ITEM* item = aCollector[i];

 switch( item->Type() )
 {
 case PCB_SHAPE_T:
 case PCB_FP_SHAPE_T:
 switch( static_cast<PCB_SHAPE*>( item )->GetShape() )
 {
 case SHAPE_T::SEGMENT:
 case SHAPE_T::ARC:
 case SHAPE_T::POLY:
 case SHAPE_T::RECT:
 break;

 default:
 aCollector.Remove( item );
 }

 break;

 case PCB_ZONE_T:
 case PCB_FP_ZONE_T:
 break;

 default:
 aCollector.Remove( item );
 }
 }
 } );

 if( selection.Empty() )
 return 0;

 auto getPolySet =
 []( EDA_ITEM* aItem )
 {
 SHAPE_POLY_SET set;

 switch( aItem->Type() )
 {
 case PCB_ZONE_T:
 case PCB_FP_ZONE_T:
 set = *static_cast<ZONE*>( aItem )->Outline();
 break;

 case PCB_SHAPE_T:
 case PCB_FP_SHAPE_T:
 {
 PCB_SHAPE* graphic = static_cast<PCB_SHAPE*>( aItem );

 if( graphic->GetShape() == SHAPE_T::POLY )
 {
 set = graphic->GetPolyShape();
 }
 else if( graphic->GetShape() == SHAPE_T::RECT )
 {
 SHAPE_LINE_CHAIN outline;
 VECTOR2I start( graphic->GetStart() );
 VECTOR2I end( graphic->GetEnd() );

 outline.Append( start );
 outline.Append( VECTOR2I( end.x, start.y ) );
 outline.Append( end );
 outline.Append( VECTOR2I( start.x, end.y ) );
 outline.SetClosed( true );

 set.AddOutline( outline );
 }
 else
 {
 wxFAIL_MSG( wxT( "Unhandled graphic shape type in PolyToLines - getPolySet" ) );
 }
 break;
 }

 default:
 wxFAIL_MSG( wxT( "Unhandled type in PolyToLines - getPolySet" ) );
 break;
 }

 return set;
 };

 auto getSegList =
 []( SHAPE_POLY_SET& aPoly )
 {
 std::vector<SEG> segs;

 // Our input should be valid polys, so OK to assert here
 wxASSERT( aPoly.VertexCount() >= 2 );

 for( int i = 1; i < aPoly.VertexCount(); i++ )
 segs.emplace_back( SEG( aPoly.CVertex( i - 1 ), aPoly.CVertex( i ) ) );

 segs.emplace_back( SEG( aPoly.CVertex( aPoly.VertexCount() - 1 ),
 aPoly.CVertex( 0 ) ) );

 return segs;
 };

 BOARD_COMMIT commit( m_frame );
 PCB_BASE_EDIT_FRAME* frame = getEditFrame<PCB_BASE_EDIT_FRAME>();
 FOOTPRINT_EDIT_FRAME* fpEditor = dynamic_cast<FOOTPRINT_EDIT_FRAME*>( m_frame );
 FOOTPRINT* footprint = nullptr;
 PCB_LAYER_ID targetLayer = m_frame->GetActiveLayer();
 PCB_LAYER_ID copperLayer = F_Cu;
 BOARD_ITEM_CONTAINER* parent = frame->GetModel();

 if( fpEditor )
 footprint = fpEditor->GetBoard()->GetFirstFootprint();

 auto handleGraphicSeg =
 [&]( EDA_ITEM* aItem )
 {
 if( aItem->Type() != PCB_SHAPE_T && aItem->Type() != PCB_FP_SHAPE_T )
 return false;

 PCB_SHAPE* graphic = static_cast<PCB_SHAPE*>( aItem );

 if( graphic->GetShape() == SHAPE_T::SEGMENT )
 {
 PCB_TRACK* track = new PCB_TRACK( parent );

 track->SetLayer( targetLayer );
 track->SetStart( graphic->GetStart() );
 track->SetEnd( graphic->GetEnd() );
 commit.Add( track );

 return true;
 }
 else if( graphic->GetShape() == SHAPE_T::ARC )
 {
 PCB_ARC* arc = new PCB_ARC( parent );

 arc->SetLayer( targetLayer );
 arc->SetStart( graphic->GetStart() );
 arc->SetEnd( graphic->GetEnd() );
 arc->SetMid( graphic->GetArcMid() );
 commit.Add( arc );

 return true;
 }

 return false;
 };

 if( aEvent.IsAction( &PCB_ACTIONS::convertToTracks ) )
 {
 if( !IsCopperLayer( targetLayer ) )
 {
 copperLayer = frame->SelectOneLayer( F_Cu, LSET::AllNonCuMask() );

 if( copperLayer == UNDEFINED_LAYER ) // User canceled
 return true;

 targetLayer = copperLayer;
 }
 }

 for( EDA_ITEM* item : selection )
 {
 if( handleGraphicSeg( item ) )
 continue;

 SHAPE_POLY_SET polySet = getPolySet( item );
 std::vector<SEG> segs = getSegList( polySet );

 if( aEvent.IsAction( &PCB_ACTIONS::convertToLines ) )
 {
 for( SEG& seg : segs )
 {
 if( fpEditor )
 {
 FP_SHAPE* graphic = new FP_SHAPE( footprint, SHAPE_T::SEGMENT );

 graphic->SetLayer( targetLayer );
 graphic->SetStart( wxPoint( seg.A ) );
 graphic->SetStart0( wxPoint( seg.A ) );
 graphic->SetEnd( wxPoint( seg.B ) );
 graphic->SetEnd0( wxPoint( seg.B ) );
 commit.Add( graphic );
 }
 else
 {
 PCB_SHAPE* graphic = new PCB_SHAPE( nullptr, SHAPE_T::SEGMENT );

 graphic->SetLayer( targetLayer );
 graphic->SetStart( wxPoint( seg.A ) );
 graphic->SetEnd( wxPoint( seg.B ) );
 commit.Add( graphic );
 }
 }
 }
 else
 {
 // I am really unsure converting a polygon to "tracks" (i.e. segments on
 // copper layers) make sense for footprints, but anyway this code exists
 if( fpEditor )
 {
 // Creating segments on copper layer
 for( SEG& seg : segs )
 {
 FP_SHAPE* graphic = new FP_SHAPE( footprint, SHAPE_T::SEGMENT );
 graphic->SetLayer( targetLayer );
 graphic->SetStart( wxPoint( seg.A ) );
 graphic->SetStart0( wxPoint( seg.A ) );
 graphic->SetEnd( wxPoint( seg.B ) );
 graphic->SetEnd0( wxPoint( seg.B ) );
 commit.Add( graphic );
 }
 }
 else
 {
 // Creating tracks
 for( SEG& seg : segs )
 {
 PCB_TRACK* track = new PCB_TRACK( parent );

 track->SetLayer( targetLayer );
 track->SetStart( wxPoint( seg.A ) );
 track->SetEnd( wxPoint( seg.B ) );
 commit.Add( track );
 }
 }
 }
 }

 commit.Push( _( "Convert polygons to lines" ) );

 return 0;
}


int CONVERT_TOOL::SegmentToArc( const TOOL_EVENT& aEvent )
{
 auto& selection = m_selectionTool->RequestSelection(
 []( const VECTOR2I& aPt, GENERAL_COLLECTOR& aCollector, PCB_SELECTION_TOOL* sTool )
 {
 for( int i = aCollector.GetCount() - 1; i >= 0; --i )
 {
 BOARD_ITEM* item = aCollector[i];

 if( !( item->Type() == PCB_SHAPE_T ||
 item->Type() == PCB_TRACE_T ||
 item->Type() == PCB_FP_SHAPE_T ) )
 {
 aCollector.Remove( item );
 }
 }
 } );

 EDA_ITEM* source = selection.Front();
 VECTOR2I start, end, mid;

 // Offset the midpoint along the normal a little bit so that it's more obviously an arc
 const double offsetRatio = 0.1;

 if( OPT<SEG> seg = getStartEndPoints( source, nullptr ) )
 {
 start = seg->A;
 end = seg->B;

 VECTOR2I normal = ( seg->B - seg->A ).Perpendicular().Resize( offsetRatio * seg->Length() );
 mid = seg->Center() + normal;
 }
 else
 {
 return -1;
 }

 PCB_BASE_EDIT_FRAME* frame = getEditFrame<PCB_BASE_EDIT_FRAME>();
 BOARD_ITEM_CONTAINER* parent = frame->GetModel();

 BOARD_ITEM* boardItem = dynamic_cast<BOARD_ITEM*>( source );

 // Don't continue processing if we don't actually have a board item
 if( !boardItem )
 return 0;

 PCB_LAYER_ID layer = boardItem->GetLayer();

 BOARD_COMMIT commit( m_frame );

 if( source->Type() == PCB_SHAPE_T || source->Type() == PCB_FP_SHAPE_T )
 {
 PCB_SHAPE* line = static_cast<PCB_SHAPE*>( source );
 PCB_SHAPE* arc = new PCB_SHAPE( parent, SHAPE_T::ARC );

 VECTOR2I center = CalcArcCenter( start, mid, end );

 arc->SetFilled( false );
 arc->SetLayer( layer );
 arc->SetWidth( line->GetWidth() );

 arc->SetCenter( wxPoint( center ) );
 arc->SetStart( wxPoint( start ) );
 arc->SetEnd( wxPoint( end ) );

 commit.Add( arc );
 }
 else
 {
 wxASSERT( source->Type() == PCB_TRACE_T );
 PCB_TRACK* line = static_cast<PCB_TRACK*>( source );
 PCB_ARC* arc = new PCB_ARC( parent );

 arc->SetLayer( layer );
 arc->SetWidth( line->GetWidth() );
 arc->SetStart( wxPoint( start ) );
 arc->SetMid( wxPoint( mid ) );
 arc->SetEnd( wxPoint( end ) );

 commit.Add( arc );
 }

 commit.Push( _( "Create arc from line segment" ) );

 return 0;
}


OPT<SEG> CONVERT_TOOL::getStartEndPoints( EDA_ITEM* aItem, int* aWidth )
{
 switch( aItem->Type() )
 {
 case PCB_SHAPE_T:
 case PCB_FP_SHAPE_T:
 {
 PCB_SHAPE* shape = static_cast<PCB_SHAPE*>( aItem );

 if( aWidth )
 *aWidth = shape->GetWidth();

 return boost::make_optional<SEG>( { VECTOR2I( shape->GetStart() ),
 VECTOR2I( shape->GetEnd() ) } );
 }

 case PCB_TRACE_T:
 {
 PCB_TRACK* line = static_cast<PCB_TRACK*>( aItem );

 if( aWidth )
 *aWidth = line->GetWidth();

 return boost::make_optional<SEG>( { VECTOR2I( line->GetStart() ),
 VECTOR2I( line->GetEnd() ) } );
 }

 case PCB_ARC_T:
 {
 PCB_ARC* arc = static_cast<PCB_ARC*>( aItem );

 if( aWidth )
 *aWidth = arc->GetWidth();

 return boost::make_optional<SEG>( { VECTOR2I( arc->GetStart() ),
 VECTOR2I( arc->GetEnd() ) } );
 }

 default:
 return NULLOPT;
 }
}


void CONVERT_TOOL::setTransitions()
{
 Go( &CONVERT_TOOL::CreatePolys, PCB_ACTIONS::convertToPoly.MakeEvent() );
 Go( &CONVERT_TOOL::CreatePolys, PCB_ACTIONS::convertToZone.MakeEvent() );
 Go( &CONVERT_TOOL::CreatePolys, PCB_ACTIONS::convertToKeepout.MakeEvent() );
 Go( &CONVERT_TOOL::CreateLines, PCB_ACTIONS::convertToLines.MakeEvent() );
 Go( &CONVERT_TOOL::CreateLines, PCB_ACTIONS::convertToTracks.MakeEvent() );
 Go( &CONVERT_TOOL::SegmentToArc, PCB_ACTIONS::convertToArc.MakeEvent() );
}