Ejemplo n.º 1
0
/**
 * Function NormalizeAreaOutlines
 * Convert a self-intersecting polygon to one (or more) non self-intersecting polygon(s)
 * @param aNewPolygonList = a std::vector<CPolyLine*> reference where to store new CPolyLine
 * needed by the normalization
 * @return the polygon count (always >= 1, because there is at least one polygon)
 * There are new polygons only if the polygon count  is > 1
 */
int CPolyLine::NormalizeAreaOutlines( std::vector<CPolyLine*>* aNewPolygonList )
{

    SHAPE_POLY_SET polySet = ConvertPolyListToPolySet( m_CornersList );

    // We are expecting only one main outline, but this main outline can have holes
    // if holes: combine holes and remove them from the main outline.
    // Note also we are using SHAPE_POLY_SET::PM_STRICTLY_SIMPLE in polygon
    // calculations, but it is not mandatory. It is used mainly
    // because there is usually only very few vertices in area outlines
    SHAPE_POLY_SET::POLYGON& outline = polySet.Polygon( 0 );
    SHAPE_POLY_SET holesBuffer;

    // Move holes stored in outline to holesBuffer:
    // The first SHAPE_LINE_CHAIN is the main outline, others are holes
    while( outline.size() > 1 )
    {
        holesBuffer.AddOutline( outline.back() );
        outline.pop_back();
    }

    polySet.Simplify( SHAPE_POLY_SET::PM_STRICTLY_SIMPLE);

    // If any hole, substract it to main outline
    if( holesBuffer.OutlineCount() )
    {
        holesBuffer.Simplify( SHAPE_POLY_SET::PM_FAST);
        polySet.BooleanSubtract( holesBuffer, SHAPE_POLY_SET::PM_STRICTLY_SIMPLE );
    }

    RemoveAllContours();

    // Note: we can have more than outline, because a self intersecting outline will be
    // broken to non intersecting polygons, and removing holes can also create a few polygons
    for( int ii = 0; ii < polySet.OutlineCount(); ii++ )
    {
        CPolyLine* polyline = this;

        if( ii > 0 )
        {
            polyline = new CPolyLine;
            polyline->ImportSettings( this );
            aNewPolygonList->push_back( polyline );
        }

        SHAPE_POLY_SET pnew;
        pnew.NewOutline();
        pnew.Polygon( 0 ) = polySet.CPolygon( ii );

        polyline->m_CornersList = ConvertPolySetToPolyList( pnew );
    }

    return polySet.OutlineCount();
}
void EDA_3D_CANVAS::buildTechLayers3DView( REPORTER* aErrorMessages, REPORTER* aActivity )
{
    BOARD* pcb = GetBoard();
    bool useTextures = isRealisticMode() && isEnabled( FL_RENDER_TEXTURES );

    // Number of segments to draw a circle using segments
    const int       segcountforcircle   = 18;
    double          correctionFactor    = 1.0 / cos( M_PI / (segcountforcircle * 2) );
    const int       segcountLowQuality  = 12;   // segments to draw a circle with low quality
                                                // to reduce time calculations
                                                // for holes and items which do not need
                                                // a fine representation

    double          correctionFactorLQ = 1.0 / cos( M_PI / (segcountLowQuality * 2) );

    // segments to draw a circle to build texts. Is is used only to build
    // the shape of each segment of the stroke font, therefore no need to have
    // many segments per circle.
    const int       segcountInStrokeFont = 8;

    SHAPE_POLY_SET bufferPolys;
    SHAPE_POLY_SET allLayerHoles;              // Contains through holes, calculated only once
    SHAPE_POLY_SET bufferPcbOutlines;          // stores the board main outlines

    // Build a polygon from edge cut items
    wxString msg;

    if( !pcb->GetBoardPolygonOutlines( bufferPcbOutlines, allLayerHoles, &msg ) )
    {
        if( aErrorMessages )
        {
            msg << wxT("\n") <<
                _("Unable to calculate the board outlines.\n"
                  "Therefore use the board boundary box.") << wxT("\n\n");
            aErrorMessages->Report( msg, REPORTER::RPT_WARNING );
        }
    }

    // Build board holes, with no optimization of large holes shape.
    buildBoardThroughHolesPolygonList( allLayerHoles, segcountLowQuality, false );

    // draw graphic items, on technical layers

    static const LAYER_ID teckLayerList[] = {
        B_Adhes,
        F_Adhes,
        B_Paste,
        F_Paste,
        B_SilkS,
        F_SilkS,
        B_Mask,
        F_Mask,
    };

    // User layers are not drawn here, only technical layers
    for( LSEQ seq = LSET::AllTechMask().Seq( teckLayerList, DIM( teckLayerList ) );  seq;  ++seq )
    {
        LAYER_ID layer = *seq;

        if( !is3DLayerEnabled( layer ) )
            continue;

        if( layer == Edge_Cuts && isEnabled( FL_SHOW_BOARD_BODY )  )
            continue;

        if( aActivity )
            aActivity->Report( wxString::Format( _( "Build layer %s" ), LSET::Name( layer ) ) );

        bufferPolys.RemoveAllContours();

        for( BOARD_ITEM* item = pcb->m_Drawings; item; item = item->Next() )
        {
            if( !item->IsOnLayer( layer ) )
                continue;

            switch( item->Type() )
            {
            case PCB_LINE_T:
                ( (DRAWSEGMENT*) item )->TransformShapeWithClearanceToPolygon(
                        bufferPolys, 0, segcountforcircle, correctionFactor );
                break;

            case PCB_TEXT_T:
                ( (TEXTE_PCB*) item )->TransformShapeWithClearanceToPolygonSet(
                        bufferPolys, 0, segcountLowQuality, 1.0 );
                break;

            default:
                break;
            }
        }

        for( MODULE* module = pcb->m_Modules; module; module = module->Next() )
        {
            if( layer == F_SilkS || layer == B_SilkS )
            {
                // On silk screen layers, the pad shape is only the pad outline
                // never a filled shape
                D_PAD*  pad = module->Pads();
                int     linewidth = g_DrawDefaultLineThickness;

                for( ; pad; pad = pad->Next() )
                {
                    if( !pad->IsOnLayer( layer ) )
                        continue;

                    buildPadShapeThickOutlineAsPolygon( pad, bufferPolys,
                            linewidth, segcountforcircle, correctionFactor );
                }
            }
            else
                module->TransformPadsShapesWithClearanceToPolygon( layer,
                        bufferPolys, 0, segcountforcircle, correctionFactor );

            // On tech layers, use a poor circle approximation, only for texts (stroke font)
            module->TransformGraphicShapesWithClearanceToPolygonSet( layer,
                    bufferPolys, 0, segcountforcircle, correctionFactor, segcountInStrokeFont );
        }

        // Draw non copper zones
        if( isEnabled( FL_ZONE ) )
        {
            for( int ii = 0; ii < pcb->GetAreaCount(); ii++ )
            {
                ZONE_CONTAINER* zone = pcb->GetArea( ii );

                if( !zone->IsOnLayer( layer ) )
                    continue;

                zone->TransformSolidAreasShapesToPolygonSet(
                        bufferPolys, segcountLowQuality, correctionFactorLQ );
            }
        }

        // bufferPolys contains polygons to merge. Many overlaps .
        // Calculate merged polygons and remove pads and vias holes
        if( bufferPolys.IsEmpty() )
            continue;

        // Solder mask layers are "negative" layers.
        // Shapes should be removed from the full board area.
        if( layer == B_Mask || layer == F_Mask )
        {
            SHAPE_POLY_SET cuts = bufferPolys;
            bufferPolys = bufferPcbOutlines;

            cuts.Append(allLayerHoles);
            cuts.Simplify();

            bufferPolys.BooleanSubtract( cuts );
        }
        // Remove holes from Solder paste layers and silkscreen
        else if( layer == B_Paste || layer == F_Paste
                 || layer == B_SilkS || layer == F_SilkS  )
        {
            bufferPolys.BooleanSubtract( allLayerHoles );
        }

        int thickness = 0;

        if( layer != B_Mask && layer != F_Mask )
            thickness = GetPrm3DVisu().GetLayerObjectThicknessBIU( layer );

        int zpos = GetPrm3DVisu().GetLayerZcoordBIU( layer );

        if( layer == Edge_Cuts )
        {
            thickness = GetPrm3DVisu().GetLayerZcoordBIU( F_Cu )
                        - GetPrm3DVisu().GetLayerZcoordBIU( B_Cu );
            zpos = GetPrm3DVisu().GetLayerZcoordBIU( B_Cu )
                   + (thickness / 2);
        }
        else
        {
            // for Draw3D_SolidHorizontalPolyPolygons, zpos it the middle between bottom and top
            // sides.
            // However for top layers, zpos should be the bottom layer pos,
            // and for bottom layers, zpos should be the top layer pos.
            if( Get3DLayer_Z_Orientation( layer ) > 0 )
                zpos += thickness/2;
            else
                zpos -= thickness/2 ;
        }


        float zNormal = 1.0f; // When using thickness it will draw first the top and then botton (with z inverted)

        // If we are not using thickness, then the znormal must face the layer direction
        // because it will draw just one plane
        if( !thickness )
            zNormal = Get3DLayer_Z_Orientation( layer );


        setGLTechLayersColor( layer );
        Draw3D_SolidHorizontalPolyPolygons( bufferPolys, zpos,
                thickness, GetPrm3DVisu().m_BiuTo3Dunits, useTextures,
                zNormal );
    }
}
void EDA_3D_CANVAS::buildBoard3DView( GLuint aBoardList, GLuint aBodyOnlyList,
                                      REPORTER* aErrorMessages, REPORTER* aActivity  )
{
    BOARD* pcb = GetBoard();

    // If FL_RENDER_SHOW_HOLES_IN_ZONES is true, holes are correctly removed from copper zones areas.
    // If FL_RENDER_SHOW_HOLES_IN_ZONES is false, holes are not removed from copper zones areas,
    // but the calculation time is twice shorter.
    bool remove_Holes = isEnabled( FL_RENDER_SHOW_HOLES_IN_ZONES );

    bool realistic_mode = isRealisticMode();
    bool useTextures = isRealisticMode() && isEnabled( FL_RENDER_TEXTURES );

    // Number of segments to convert a circle to polygon
    // We use 2 values: the first gives a good shape (for instanes rond pads)
    // the second is used to speed up calculations, when a poor approximation is acceptable (holes)
    const int       segcountforcircle   = 18;
    double          correctionFactor    = 1.0 / cos( M_PI / (segcountforcircle * 2.0) );
    const int       segcountLowQuality  = 12;   // segments to draw a circle with low quality
                                                // to reduce time calculations
                                                // for holes and items which do not need
                                                // a fine representation
    double          correctionFactorLQ  = 1.0 / cos( M_PI / (segcountLowQuality * 2.0) );

    SHAPE_POLY_SET  bufferPolys;        // copper areas: tracks, pads and filled zones areas
                                        // when holes are removed from zones
    SHAPE_POLY_SET  bufferPcbOutlines;  // stores the board main outlines
    SHAPE_POLY_SET  bufferZonesPolys;   // copper filled zones areas
                                        // when holes are not removed from zones
    SHAPE_POLY_SET  currLayerHoles;     // Contains holes for the current layer
    SHAPE_POLY_SET  allLayerHoles;      // Contains holes for all layers

    // Build a polygon from edge cut items
    wxString msg;

    if( !pcb->GetBoardPolygonOutlines( bufferPcbOutlines, allLayerHoles, &msg ) )
    {
        if( aErrorMessages )
        {
            msg << wxT("\n") << _("Unable to calculate the board outlines.\n"
                                  "Therefore use the board boundary box.") << wxT("\n\n");

            aErrorMessages->Report( msg, REPORTER::RPT_WARNING );
        }
    }

    // Build board holes, with optimization of large holes shape.
    buildBoardThroughHolesPolygonList( allLayerHoles, segcountLowQuality, true );

    LSET            cu_set = LSET::AllCuMask( GetPrm3DVisu().m_CopperLayersCount );

    glNewList( aBoardList, GL_COMPILE );

    for( LSEQ cu = cu_set.CuStack();  cu;  ++cu )
    {
        LAYER_ID layer = *cu;

        // Skip non enabled layers in normal mode,
        // and internal layers in realistic mode
        if( !is3DLayerEnabled( layer ) )
            continue;

        if( aActivity )
            aActivity->Report( wxString::Format( _( "Build layer %s" ), LSET::Name( layer ) ) );

        bufferPolys.RemoveAllContours();
        bufferZonesPolys.RemoveAllContours();
        currLayerHoles.RemoveAllContours();

        // Draw track shapes:
        for( TRACK* track = pcb->m_Track;  track;  track = track->Next() )
        {
            if( !track->IsOnLayer( layer ) )
                continue;

            track->TransformShapeWithClearanceToPolygon( bufferPolys,
                                                         0, segcountforcircle,
                                                         correctionFactor );

            // Add blind/buried via holes
            if( track->Type() == PCB_VIA_T )
            {
                VIA *via = static_cast<VIA*>( track );

                if( via->GetViaType() == VIA_THROUGH )
                    continue;   // already done

                int holediameter = via->GetDrillValue();
                int thickness = GetPrm3DVisu().GetCopperThicknessBIU();
                int hole_outer_radius = (holediameter + thickness) / 2;

                TransformCircleToPolygon( currLayerHoles,
                                          via->GetStart(), hole_outer_radius,
                                          segcountLowQuality );
            }
        }

        // draw pad shapes
        for( MODULE* module = pcb->m_Modules;  module;  module = module->Next() )
        {
            // Note: NPTH pads are not drawn on copper layers when the pad
            // has same shape as its hole
            module->TransformPadsShapesWithClearanceToPolygon( layer,
                                                               bufferPolys,
                                                               0,
                                                               segcountforcircle,
                                                               correctionFactor, true );

            // Micro-wave modules may have items on copper layers
            module->TransformGraphicShapesWithClearanceToPolygonSet( layer,
                                                                     bufferPolys,
                                                                     0,
                                                                     segcountforcircle,
                                                                     correctionFactor );

            // pad holes are already in list.
        }

        // Draw copper zones. Note:
        // * if the holes are removed from copper zones
        // the polygons are stored in bufferPolys (which contains all other polygons)
        // * if the holes are NOT removed from copper zones
        // the polygons are stored in bufferZonesPolys
        if( isEnabled( FL_ZONE ) )
        {
            for( int ii = 0; ii < pcb->GetAreaCount(); ii++ )
            {
                ZONE_CONTAINER* zone = pcb->GetArea( ii );
                LAYER_NUM       zonelayer = zone->GetLayer();

                if( zonelayer == layer )
                {
                    zone->TransformSolidAreasShapesToPolygonSet(
                        remove_Holes ? bufferPolys : bufferZonesPolys,
                        segcountLowQuality, correctionFactorLQ );
                }
            }
        }

        // draw graphic items on copper layers (texts)
        for( BOARD_ITEM* item = pcb->m_Drawings; item; item = item->Next() )
        {
            if( !item->IsOnLayer( layer ) )
                continue;

            switch( item->Type() )
            {
            case PCB_LINE_T:    // should not exist on copper layers
                ( (DRAWSEGMENT*) item )->TransformShapeWithClearanceToPolygon(
                    bufferPolys, 0, segcountforcircle, correctionFactor );
                break;

            case PCB_TEXT_T:
                ( (TEXTE_PCB*) item )->TransformShapeWithClearanceToPolygonSet(
                    bufferPolys, 0, segcountLowQuality, correctionFactor );
                break;

            default:
                break;
            }
        }

        // bufferPolys contains polygons to merge. Many overlaps .
        // Calculate merged polygons
        if( bufferPolys.IsEmpty() )
            continue;

        // Use Clipper lib to subtract holes to copper areas
        if( currLayerHoles.OutlineCount() )
        {
            currLayerHoles.Append(allLayerHoles);
            currLayerHoles.Simplify();
            bufferPolys.BooleanSubtract( currLayerHoles );
        }
        else
            bufferPolys.BooleanSubtract( allLayerHoles );

        int thickness = GetPrm3DVisu().GetLayerObjectThicknessBIU( layer );
        int zpos = GetPrm3DVisu().GetLayerZcoordBIU( layer );

        float zNormal = 1.0f; // When using thickness it will draw first the top and then botton (with z inverted)

        // If we are not using thickness, then the z-normal has to match the layer direction
        // because just one plane will be drawn
        if( !thickness )
            zNormal = Get3DLayer_Z_Orientation( layer );

        if( realistic_mode )
        {
            setGLCopperColor();
        }
        else
        {
            EDA_COLOR_T color = g_ColorsSettings.GetLayerColor( layer );
            SetGLColor( color );
        }

        // If holes are removed from copper zones, bufferPolys contains all polygons
        // to draw (tracks+zones+texts).
        Draw3D_SolidHorizontalPolyPolygons( bufferPolys, zpos, thickness,
                                            GetPrm3DVisu().m_BiuTo3Dunits, useTextures,
                                            zNormal );

        // If holes are not removed from copper zones (for calculation time reasons,
        // the zone polygons are stored in bufferZonesPolys and have to be drawn now:
        if( !bufferZonesPolys.IsEmpty() )
        {
            Draw3D_SolidHorizontalPolyPolygons( bufferZonesPolys, zpos, thickness,
                                    GetPrm3DVisu().m_BiuTo3Dunits, useTextures,
                                    zNormal );
        }
    }

    if( aActivity )
        aActivity->Report( _( "Build board body" ) );

    // Draw plated vertical holes inside the board, but not always. They are drawn:
    // - if the board body is not shown, to show the holes.
    // - or if the copper thickness is shown
    if( !isEnabled( FL_SHOW_BOARD_BODY ) || isEnabled( FL_USE_COPPER_THICKNESS ) )
    {
        // Draw vias holes (vertical cylinders)
        for( const TRACK* track = pcb->m_Track;  track;  track = track->Next() )
        {
            if( track->Type() == PCB_VIA_T )
            {
                const VIA *via = static_cast<const VIA*>(track);
                draw3DViaHole( via );
            }
        }

        // Draw pads holes (vertical cylinders)
        for( const MODULE* module = pcb->m_Modules;  module;  module = module->Next() )
        {
            for( D_PAD* pad = module->Pads(); pad; pad = pad->Next() )
                if( pad->GetAttribute () != PAD_HOLE_NOT_PLATED )
                    draw3DPadHole( pad );
        }
    }

    glEndList();

    // Build the body board:
    glNewList( aBodyOnlyList, GL_COMPILE );

    if( isRealisticMode() )
    {
        setGLEpoxyColor( 1.00 );
    }
    else
    {
        EDA_COLOR_T color = g_ColorsSettings.GetLayerColor( Edge_Cuts );
        SetGLColor( color, 0.7 );
    }

    float copper_thickness = GetPrm3DVisu().GetCopperThicknessBIU();

    // a small offset between substrate and external copper layer to avoid artifacts
    // when drawing copper items on board
    float epsilon = Millimeter2iu( 0.01 );
    float zpos = GetPrm3DVisu().GetLayerZcoordBIU( B_Cu );
    float board_thickness = GetPrm3DVisu().GetLayerZcoordBIU( F_Cu )
                        - GetPrm3DVisu().GetLayerZcoordBIU( B_Cu );

    // items on copper layers and having a thickness = copper_thickness
    // are drawn from zpos - copper_thickness/2 to zpos + copper_thickness
    // therefore substrate position is copper_thickness/2 to
    // substrate_height - copper_thickness/2
    zpos += (copper_thickness + epsilon) / 2.0f;
    board_thickness -= copper_thickness + epsilon;

    bufferPcbOutlines.BooleanSubtract( allLayerHoles );

    if( !bufferPcbOutlines.IsEmpty() )
    {
        Draw3D_SolidHorizontalPolyPolygons( bufferPcbOutlines, zpos + board_thickness / 2.0,
                                            board_thickness, GetPrm3DVisu().m_BiuTo3Dunits, useTextures,
                                            1.0f );
    }

    glEndList();
}
void ZONE_CONTAINER::AddClearanceAreasPolygonsToPolysList_NG( BOARD* aPcb )
{
    int segsPerCircle;
    double correctionFactor;
    int outline_half_thickness = m_ZoneMinThickness / 2;


    std::unique_ptr<SHAPE_FILE_IO> dumper( new SHAPE_FILE_IO(
            g_DumpZonesWhenFilling ? "zones_dump.txt" : "", SHAPE_FILE_IO::IOM_APPEND ) );

    // Set the number of segments in arc approximations
    if( m_ArcToSegmentsCount == ARC_APPROX_SEGMENTS_COUNT_HIGHT_DEF  )
        segsPerCircle = ARC_APPROX_SEGMENTS_COUNT_HIGHT_DEF;
    else
        segsPerCircle = ARC_APPROX_SEGMENTS_COUNT_LOW_DEF;

    /* calculates the coeff to compensate radius reduction of holes clearance
     * due to the segment approx.
     * For a circle the min radius is radius * cos( 2PI / s_CircleToSegmentsCount / 2)
     * s_Correction is 1 /cos( PI/s_CircleToSegmentsCount  )
     */
    correctionFactor = 1.0 / cos( M_PI / (double) segsPerCircle );

    CPOLYGONS_LIST tmp;

    if(g_DumpZonesWhenFilling)
        dumper->BeginGroup("clipper-zone");

    SHAPE_POLY_SET solidAreas = ConvertPolyListToPolySet( m_smoothedPoly->m_CornersList );

    solidAreas.Inflate( -outline_half_thickness, segsPerCircle );
    solidAreas.Simplify( POLY_CALC_MODE );

    SHAPE_POLY_SET holes;

    if(g_DumpZonesWhenFilling)
        dumper->Write( &solidAreas, "solid-areas" );

    tmp.RemoveAllContours();
    buildFeatureHoleList( aPcb, holes );

    if(g_DumpZonesWhenFilling)
        dumper->Write( &holes, "feature-holes" );

    holes.Simplify( POLY_CALC_MODE );

    if (g_DumpZonesWhenFilling)
        dumper->Write( &holes, "feature-holes-postsimplify" );

    solidAreas.BooleanSubtract( holes, POLY_CALC_MODE );

    if (g_DumpZonesWhenFilling)
        dumper->Write( &solidAreas, "solid-areas-minus-holes" );

    SHAPE_POLY_SET areas_fractured = solidAreas;
    areas_fractured.Fracture( POLY_CALC_MODE );

    if (g_DumpZonesWhenFilling)
        dumper->Write( &areas_fractured, "areas_fractured" );

    m_FilledPolysList = areas_fractured;

    // Remove insulated islands:
    if( GetNetCode() > 0 )
        TestForCopperIslandAndRemoveInsulatedIslands( aPcb );

    SHAPE_POLY_SET thermalHoles;

    // Test thermal stubs connections and add polygons to remove unconnected stubs.
    // (this is a refinement for thermal relief shapes)
    if( GetNetCode() > 0 )
        BuildUnconnectedThermalStubsPolygonList( thermalHoles, aPcb, this,
                                                 correctionFactor, s_thermalRot );

    // remove copper areas corresponding to not connected stubs
    if( !thermalHoles.IsEmpty() )
    {
        thermalHoles.Simplify( POLY_CALC_MODE );
        // Remove unconnected stubs
        solidAreas.BooleanSubtract( thermalHoles, POLY_CALC_MODE );

        if( g_DumpZonesWhenFilling )
            dumper->Write( &thermalHoles, "thermal-holes" );

        // put these areas in m_FilledPolysList
        SHAPE_POLY_SET th_fractured = solidAreas;
        th_fractured.Fracture( POLY_CALC_MODE );

        if( g_DumpZonesWhenFilling )
            dumper->Write ( &th_fractured, "th_fractured" );

        m_FilledPolysList = th_fractured;

        if( GetNetCode() > 0 )
            TestForCopperIslandAndRemoveInsulatedIslands( aPcb );
    }

    if(g_DumpZonesWhenFilling)
        dumper->EndGroup();
}
/*
 * Note 1: polygons are drawm using outlines witk a thickness = aMinThicknessValue
 * so shapes must take in account this outline thickness
 *
 * Note 2:
 *      Trapezoidal pads are not considered here because they are very special case
 *      and are used in microwave applications and they *DO NOT* have a thermal relief that
 *      change the shape by creating stubs and destroy their properties.
 */
void CreateThermalReliefPadPolygon( SHAPE_POLY_SET& aCornerBuffer,
                                    const D_PAD&    aPad,
                                    int             aThermalGap,
                                    int             aCopperThickness,
                                    int             aMinThicknessValue,
                                    int             aError,
                                    double          aThermalRot )
{
    wxPoint corner, corner_end;
    wxSize  copper_thickness;
    wxPoint padShapePos = aPad.ShapePos();      // Note: for pad having a shape offset,
                                                // the pad position is NOT the shape position

    /* Keep in account the polygon outline thickness
     * aThermalGap must be increased by aMinThicknessValue/2 because drawing external outline
     * with a thickness of aMinThicknessValue will reduce gap by aMinThicknessValue/2
     */
    aThermalGap += aMinThicknessValue / 2;

    /* Keep in account the polygon outline thickness
     * copper_thickness must be decreased by aMinThicknessValue because drawing outlines
     * with a thickness of aMinThicknessValue will increase real thickness by aMinThicknessValue
     */
    int     dx = aPad.GetSize().x / 2;
    int     dy = aPad.GetSize().y / 2;

    copper_thickness.x = std::min( aPad.GetSize().x, aCopperThickness ) - aMinThicknessValue;
    copper_thickness.y = std::min( aPad.GetSize().y, aCopperThickness ) - aMinThicknessValue;

    if( copper_thickness.x < 0 )
        copper_thickness.x = 0;

    if( copper_thickness.y < 0 )
        copper_thickness.y = 0;

    switch( aPad.GetShape() )
    {
    case PAD_SHAPE_CIRCLE:    // Add 4 similar holes
        {
            /* we create 4 copper holes and put them in position 1, 2, 3 and 4
             * here is the area of the rectangular pad + its thermal gap
             * the 4 copper holes remove the copper in order to create the thermal gap
             * 4 ------ 1
             * |        |
             * |        |
             * |        |
             * |        |
             * 3 ------ 2
             * holes 2, 3, 4 are the same as hole 1, rotated 90, 180, 270 deg
             */

            // Build the hole pattern, for the hole in the X >0, Y > 0 plane:
            // The pattern roughtly is a 90 deg arc pie
            std::vector <wxPoint> corners_buffer;

            int    numSegs = std::max( GetArcToSegmentCount( dx + aThermalGap, aError, 360.0 ), 6 );
            double correction = GetCircletoPolyCorrectionFactor( numSegs );
            double delta = 3600.0 / numSegs;

            // Radius of outer arcs of the shape corrected for arc approximation by lines
            int outer_radius = KiROUND( ( dx + aThermalGap ) * correction );

            // Crosspoint of thermal spoke sides, the first point of polygon buffer
            corners_buffer.push_back( wxPoint( copper_thickness.x / 2, copper_thickness.y / 2 ) );

            // Add an intermediate point on spoke sides, to allow a > 90 deg angle between side
            // and first seg of arc approx
            corner.x = copper_thickness.x / 2;
            int y = outer_radius - (aThermalGap / 4);
            corner.y = KiROUND( sqrt( ( (double) y * y  - (double) corner.x * corner.x ) ) );

            if( aThermalRot != 0 )
                corners_buffer.push_back( corner );

            // calculate the starting point of the outter arc
            corner.x = copper_thickness.x / 2;

            corner.y = KiROUND( sqrt( ( (double) outer_radius * outer_radius ) -
                                      ( (double) corner.x * corner.x ) ) );
            RotatePoint( &corner, 90 ); // 9 degrees is the spoke fillet size

            // calculate the ending point of the outer arc
            corner_end.x = corner.y;
            corner_end.y = corner.x;

            // calculate intermediate points (y coordinate from corner.y to corner_end.y
            while( (corner.y > corner_end.y)  && (corner.x < corner_end.x) )
            {
                corners_buffer.push_back( corner );
                RotatePoint( &corner, delta );
            }

            corners_buffer.push_back( corner_end );

            /* add an intermediate point, to avoid angles < 90 deg between last arc approx line
             * and radius line
             */
            corner.x = corners_buffer[1].y;
            corner.y = corners_buffer[1].x;
            corners_buffer.push_back( corner );

            // Now, add the 4 holes ( each is the pattern, rotated by 0, 90, 180 and 270  deg
            // aThermalRot = 450 (45.0 degrees orientation) work fine.
            double angle_pad = aPad.GetOrientation();              // Pad orientation
            double th_angle  = aThermalRot;

            for( unsigned ihole = 0; ihole < 4; ihole++ )
            {
                aCornerBuffer.NewOutline();

                for( unsigned ii = 0; ii < corners_buffer.size(); ii++ )
                {
                    corner = corners_buffer[ii];
                    RotatePoint( &corner, th_angle + angle_pad );          // Rotate by segment angle and pad orientation
                    corner += padShapePos;
                    aCornerBuffer.Append( corner.x, corner.y );
                }

                th_angle += 900;       // Note: th_angle in in 0.1 deg.
            }
        }
        break;

    case PAD_SHAPE_OVAL:
        {
            // Oval pad support along the lines of round and rectangular pads
            std::vector <wxPoint> corners_buffer;               // Polygon buffer as vector

            dx = (aPad.GetSize().x / 2) + aThermalGap;     // Cutout radius x
            dy = (aPad.GetSize().y / 2) + aThermalGap;     // Cutout radius y

            wxPoint shape_offset;

            // We want to calculate an oval shape with dx > dy.
            // if this is not the case, exchange dx and dy, and rotate the shape 90 deg.
            int supp_angle = 0;

            if( dx < dy )
            {
                std::swap( dx, dy );
                supp_angle = 900;
                std::swap( copper_thickness.x, copper_thickness.y );
            }

            int deltasize = dx - dy;        // = distance between shape position and the 2 demi-circle ends centre
            // here we have dx > dy
            // Radius of outer arcs of the shape:
            int outer_radius = dy;     // The radius of the outer arc is radius end + aThermalGap


            int    numSegs = std::max( GetArcToSegmentCount( outer_radius, aError, 360.0 ), 6 );
            double delta = 3600.0 / numSegs;

            // Some coordinate fiddling, depending on the shape offset direction
            shape_offset = wxPoint( deltasize, 0 );

            // Crosspoint of thermal spoke sides, the first point of polygon buffer
            corner.x = copper_thickness.x / 2;
            corner.y = copper_thickness.y / 2;
            corners_buffer.push_back( corner );

            // Arc start point calculation, the intersecting point of cutout arc and thermal spoke edge
            // If copper thickness is more than shape offset, we need to calculate arc intercept point.
            if( copper_thickness.x > deltasize )
            {
                corner.x = copper_thickness.x / 2;
                corner.y = KiROUND( sqrt( ( (double) outer_radius * outer_radius ) -
                                        ( (double) ( corner.x - delta ) * ( corner.x - deltasize ) ) ) );
                corner.x -= deltasize;

                /* creates an intermediate point, to have a > 90 deg angle
                 * between the side and the first segment of arc approximation
                 */
                wxPoint intpoint = corner;
                intpoint.y -= aThermalGap / 4;
                corners_buffer.push_back( intpoint + shape_offset );
                RotatePoint( &corner, 90 ); // 9 degrees of thermal fillet
            }
            else
            {
                corner.x = copper_thickness.x / 2;
                corner.y = outer_radius;
                corners_buffer.push_back( corner );
            }

            // Add an intermediate point on spoke sides, to allow a > 90 deg angle between side
            // and first seg of arc approx
            wxPoint last_corner;
            last_corner.y = copper_thickness.y / 2;
            int     px = outer_radius - (aThermalGap / 4);
            last_corner.x =
                KiROUND( sqrt( ( ( (double) px * px ) - (double) last_corner.y * last_corner.y ) ) );

            // Arc stop point calculation, the intersecting point of cutout arc and thermal spoke edge
            corner_end.y = copper_thickness.y / 2;
            corner_end.x =
                KiROUND( sqrt( ( (double) outer_radius *
                             outer_radius ) - ( (double) corner_end.y * corner_end.y ) ) );
            RotatePoint( &corner_end, -90 ); // 9 degrees of thermal fillet

            // calculate intermediate arc points till limit is reached
            while( (corner.y > corner_end.y)  && (corner.x < corner_end.x) )
            {
                corners_buffer.push_back( corner + shape_offset );
                RotatePoint( &corner, delta );
            }

            //corners_buffer.push_back(corner + shape_offset);      // TODO: about one mil geometry error forms somewhere.
            corners_buffer.push_back( corner_end + shape_offset );
            corners_buffer.push_back( last_corner + shape_offset );         // Enabling the line above shows intersection point.

            /* Create 2 holes, rotated by pad rotation.
             */
            double angle = aPad.GetOrientation() + supp_angle;

            for( int irect = 0; irect < 2; irect++ )
            {
                aCornerBuffer.NewOutline();
                for( unsigned ic = 0; ic < corners_buffer.size(); ic++ )
                {
                    wxPoint cpos = corners_buffer[ic];
                    RotatePoint( &cpos, angle );
                    cpos += padShapePos;
                    aCornerBuffer.Append( cpos.x, cpos.y );
                }

                angle = AddAngles( angle, 1800 ); // this is calculate hole 3
            }

            // Create holes, that are the mirrored from the previous holes
            for( unsigned ic = 0; ic < corners_buffer.size(); ic++ )
            {
                wxPoint swap = corners_buffer[ic];
                swap.x = -swap.x;
                corners_buffer[ic] = swap;
            }

            // Now add corner 4 and 2 (2 is the corner 4 rotated by 180 deg
            angle = aPad.GetOrientation() + supp_angle;

            for( int irect = 0; irect < 2; irect++ )
            {
                aCornerBuffer.NewOutline();

                for( unsigned ic = 0; ic < corners_buffer.size(); ic++ )
                {
                    wxPoint cpos = corners_buffer[ic];
                    RotatePoint( &cpos, angle );
                    cpos += padShapePos;
                    aCornerBuffer.Append( cpos.x, cpos.y );
                }

                angle = AddAngles( angle, 1800 );
            }
        }
        break;

    case PAD_SHAPE_CHAMFERED_RECT:
    case PAD_SHAPE_ROUNDRECT:   // thermal shape is the same for rectangular shapes.
    case PAD_SHAPE_RECT:
        {
            /* we create 4 copper holes and put them in position 1, 2, 3 and 4
             * here is the area of the rectangular pad + its thermal gap
             * the 4 copper holes remove the copper in order to create the thermal gap
             * 1 ------ 4
             * |        |
             * |        |
             * |        |
             * |        |
             * 2 ------ 3
             * hole 3 is the same as hole 1, rotated 180 deg
             * hole 4 is the same as hole 2, rotated 180 deg and is the same as hole 1, mirrored
             */

            // First, create a rectangular hole for position 1 :
            // 2 ------- 3
            //  |        |
            //  |        |
            //  |        |
            // 1  -------4

            // Modified rectangles with one corner rounded. TODO: merging with oval thermals
            // and possibly round too.

            std::vector <wxPoint> corners_buffer;               // Polygon buffer as vector

            dx = (aPad.GetSize().x / 2) + aThermalGap;         // Cutout radius x
            dy = (aPad.GetSize().y / 2) + aThermalGap;         // Cutout radius y

            // calculation is optimized for pad shape with dy >= dx (vertical rectangle).
            // if it is not the case, just rotate this shape 90 degrees:
            double angle = aPad.GetOrientation();
            wxPoint corner_origin_pos( -aPad.GetSize().x / 2, -aPad.GetSize().y / 2 );

            if( dy < dx )
            {
                std::swap( dx, dy );
                std::swap( copper_thickness.x, copper_thickness.y );
                std::swap( corner_origin_pos.x, corner_origin_pos.y );
                angle += 900.0;
            }
            // Now calculate the hole pattern in position 1 ( top left pad corner )

            // The first point of polygon buffer is left lower corner, second the crosspoint of
            // thermal spoke sides, the third is upper right corner and the rest are rounding
            // vertices going anticlockwise. Note the inverted Y-axis in corners_buffer y coordinates.
            wxPoint arc_end_point( -dx, -(aThermalGap / 4 + copper_thickness.y / 2) );
            corners_buffer.push_back( arc_end_point );          // Adds small miters to zone
            corners_buffer.push_back( wxPoint( -(dx - aThermalGap / 4), -copper_thickness.y / 2 ) );    // fill and spoke corner
            corners_buffer.push_back( wxPoint( -copper_thickness.x / 2, -copper_thickness.y / 2 ) );
            corners_buffer.push_back( wxPoint( -copper_thickness.x / 2, -(dy - aThermalGap / 4) ) );
            // The first point to build the rounded corner:
            wxPoint arc_start_point( -(aThermalGap / 4 + copper_thickness.x / 2) , -dy );
            corners_buffer.push_back( arc_start_point );

            int    numSegs = std::max( GetArcToSegmentCount( aThermalGap, aError, 360.0 ), 6 );
            double correction = GetCircletoPolyCorrectionFactor( numSegs );
            int    rounding_radius = KiROUND( aThermalGap * correction ); // Corner rounding radius

            // Calculate arc angle parameters.
            // the start angle id near 900 decidegrees, the final angle is near 1800.0 decidegrees.
            double arc_increment = 3600.0 / numSegs;

            // the arc_angle_start is 900.0 or slighly more, depending on the actual arc starting point
            double arc_angle_start = atan2( -arc_start_point.y -corner_origin_pos.y, arc_start_point.x - corner_origin_pos.x ) * 1800/M_PI;
            if( arc_angle_start < 900.0 )
                arc_angle_start = 900.0;

            bool first_point = true;
            for( double curr_angle = arc_angle_start; ; curr_angle += arc_increment )
            {
                wxPoint corner_position = wxPoint( rounding_radius, 0 );
                RotatePoint( &corner_position, curr_angle );        // Rounding vector rotation
                corner_position += corner_origin_pos;               // Rounding vector + Pad corner offset

                // The arc angle is <= 90 degrees, therefore the arc is finished if the x coordinate
                // decrease or the y coordinate is smaller than the y end point
                if( !first_point &&
                    ( corner_position.x >= corners_buffer.back().x || corner_position.y > arc_end_point.y ) )
                    break;

                first_point = false;

                // Note: for hole in position 1, arc x coordinate is always < x starting point
                // and arc y coordinate is always <= y ending point
                if( corner_position != corners_buffer.back()    // avoid duplicate corners.
                    && corner_position.x <= arc_start_point.x )   // skip current point at the right of the starting point
                    corners_buffer.push_back( corner_position );
            }

            for( int irect = 0; irect < 2; irect++ )
            {
                aCornerBuffer.NewOutline();

                for( unsigned ic = 0; ic < corners_buffer.size(); ic++ )
                {
                    wxPoint cpos = corners_buffer[ic];
                    RotatePoint( &cpos, angle );            // Rotate according to module orientation
                    cpos += padShapePos;                    // Shift origin to position
                    aCornerBuffer.Append( cpos.x, cpos.y );
                }

                angle = AddAngles( angle, 1800 );       // this is calculate hole 3
            }

            // Create holes, that are the mirrored from the previous holes
            for( unsigned ic = 0; ic < corners_buffer.size(); ic++ )
            {
                wxPoint swap = corners_buffer[ic];
                swap.x = -swap.x;
                corners_buffer[ic] = swap;
            }

            // Now add corner 4 and 2 (2 is the corner 4 rotated by 180 deg
            for( int irect = 0; irect < 2; irect++ )
            {
                aCornerBuffer.NewOutline();

                for( unsigned ic = 0; ic < corners_buffer.size(); ic++ )
                {
                    wxPoint cpos = corners_buffer[ic];
                    RotatePoint( &cpos, angle );
                    cpos += padShapePos;
                    aCornerBuffer.Append( cpos.x, cpos.y );
                }

                angle = AddAngles( angle, 1800 );
            }
        }
        break;

    case PAD_SHAPE_TRAPEZOID:
        {
        SHAPE_POLY_SET antipad;       // The full antipad area

        // We need a length to build the stubs of the thermal reliefs
        // the value is not very important. The pad bounding box gives a reasonable value
        EDA_RECT bbox = aPad.GetBoundingBox();
        int stub_len = std::max( bbox.GetWidth(), bbox.GetHeight() );

        aPad.TransformShapeWithClearanceToPolygon( antipad, aThermalGap );

        SHAPE_POLY_SET stub;          // A basic stub ( a rectangle)
        SHAPE_POLY_SET stubs;        // the full stubs shape


        // We now substract the stubs (connections to the copper zone)
        //ClipperLib::Clipper clip_engine;
        // Prepare a clipping transform
        //clip_engine.AddPath( antipad, ClipperLib::ptSubject, true );

        // Create stubs and add them to clipper engine
        wxPoint stubBuffer[4];
        stubBuffer[0].x = stub_len;
        stubBuffer[0].y = copper_thickness.y/2;
        stubBuffer[1] = stubBuffer[0];
        stubBuffer[1].y = -copper_thickness.y/2;
        stubBuffer[2] = stubBuffer[1];
        stubBuffer[2].x = -stub_len;
        stubBuffer[3] = stubBuffer[2];
        stubBuffer[3].y = copper_thickness.y/2;

        stub.NewOutline();

        for( unsigned ii = 0; ii < arrayDim( stubBuffer ); ii++ )
        {
            wxPoint cpos = stubBuffer[ii];
            RotatePoint( &cpos, aPad.GetOrientation() );
            cpos += padShapePos;
            stub.Append( cpos.x, cpos.y );
        }

        stubs.Append( stub );

        stubBuffer[0].y = stub_len;
        stubBuffer[0].x = copper_thickness.x/2;
        stubBuffer[1] = stubBuffer[0];
        stubBuffer[1].x = -copper_thickness.x/2;
        stubBuffer[2] = stubBuffer[1];
        stubBuffer[2].y = -stub_len;
        stubBuffer[3] = stubBuffer[2];
        stubBuffer[3].x = copper_thickness.x/2;

        stub.RemoveAllContours();
        stub.NewOutline();

        for( unsigned ii = 0; ii < arrayDim( stubBuffer ); ii++ )
        {
            wxPoint cpos = stubBuffer[ii];
            RotatePoint( &cpos, aPad.GetOrientation() );
            cpos += padShapePos;
            stub.Append( cpos.x, cpos.y );
        }

        stubs.Append( stub );
        stubs.Simplify( SHAPE_POLY_SET::PM_FAST );

        antipad.BooleanSubtract( stubs, SHAPE_POLY_SET::PM_FAST );
        aCornerBuffer.Append( antipad );

        break;
        }

    default:
        ;
    }
}
Ejemplo n.º 6
0
/**
 * Function ComputeRawFilledAreas
 * Supports a min thickness area constraint.
 * Add non copper areas polygons (pads and tracks with clearance)
 * to the filled copper area found
 * in BuildFilledPolysListData after calculating filled areas in a zone
 * Non filled copper areas are pads and track and their clearance areas
 * The filled copper area must be computed just before.
 * BuildFilledPolysListData() call this function just after creating the
 *  filled copper area polygon (without clearance areas)
 * to do that this function:
 * 1 - Creates the main outline (zone outline) using a correction to shrink the resulting area
 *     with m_ZoneMinThickness/2 value.
 *     The result is areas with a margin of m_ZoneMinThickness/2
 *     When drawing outline with segments having a thickness of m_ZoneMinThickness, the
 *      outlines will match exactly the initial outlines
 * 3 - Add all non filled areas (pads, tracks) in group B with a clearance of m_Clearance +
 *     m_ZoneMinThickness/2
 *     in a buffer
 *   - If Thermal shapes are wanted, add non filled area, in order to create these thermal shapes
 * 4 - calculates the polygon A - B
 * 5 - put resulting list of polygons (filled areas) in m_FilledPolysList
 *     This zone contains pads with the same net.
 * 6 - Remove insulated copper islands
 * 7 - If Thermal shapes are wanted, remove unconnected stubs in thermal shapes:
 *     creates a buffer of polygons corresponding to stubs to remove
 *     sub them to the filled areas.
 *     Remove new insulated copper islands
 */
void ZONE_FILLER::computeRawFilledAreas( const ZONE_CONTAINER* aZone,
        const SHAPE_POLY_SET& aSmoothedOutline,
        SHAPE_POLY_SET& aRawPolys,
        SHAPE_POLY_SET& aFinalPolys ) const
{
    int segsPerCircle;
    double correctionFactor;
    int outline_half_thickness = aZone->GetMinThickness() / 2;

    std::unique_ptr<SHAPE_FILE_IO> dumper( new SHAPE_FILE_IO(
                    s_DumpZonesWhenFilling ? "zones_dump.txt" : "", SHAPE_FILE_IO::IOM_APPEND ) );

    // Set the number of segments in arc approximations
    if( aZone->GetArcSegmentCount() == ARC_APPROX_SEGMENTS_COUNT_HIGHT_DEF  )
        segsPerCircle = ARC_APPROX_SEGMENTS_COUNT_HIGHT_DEF;
    else
        segsPerCircle = ARC_APPROX_SEGMENTS_COUNT_LOW_DEF;

    /* calculates the coeff to compensate radius reduction of holes clearance
     * due to the segment approx.
     * For a circle the min radius is radius * cos( 2PI / s_CircleToSegmentsCount / 2)
     * s_Correction is 1 /cos( PI/s_CircleToSegmentsCount  )
     */
    correctionFactor = 1.0 / cos( M_PI / (double) segsPerCircle );

    if( s_DumpZonesWhenFilling )
        dumper->BeginGroup( "clipper-zone" );

    SHAPE_POLY_SET solidAreas = aSmoothedOutline;

    solidAreas.Inflate( -outline_half_thickness, segsPerCircle );
    solidAreas.Simplify( SHAPE_POLY_SET::PM_FAST );

    SHAPE_POLY_SET holes;

    if( s_DumpZonesWhenFilling )
        dumper->Write( &solidAreas, "solid-areas" );

    buildZoneFeatureHoleList( aZone, holes );

    if( s_DumpZonesWhenFilling )
        dumper->Write( &holes, "feature-holes" );

    holes.Simplify( SHAPE_POLY_SET::PM_FAST );

    if( s_DumpZonesWhenFilling )
        dumper->Write( &holes, "feature-holes-postsimplify" );

    // Generate the filled areas (currently, without thermal shapes, which will
    // be created later).
    // Use SHAPE_POLY_SET::PM_STRICTLY_SIMPLE to generate strictly simple polygons
    // needed by Gerber files and Fracture()
    solidAreas.BooleanSubtract( holes, SHAPE_POLY_SET::PM_STRICTLY_SIMPLE );

    if( s_DumpZonesWhenFilling )
        dumper->Write( &solidAreas, "solid-areas-minus-holes" );

    SHAPE_POLY_SET areas_fractured = solidAreas;
    areas_fractured.Fracture( SHAPE_POLY_SET::PM_FAST );

    if( s_DumpZonesWhenFilling )
        dumper->Write( &areas_fractured, "areas_fractured" );

    aFinalPolys = areas_fractured;

    SHAPE_POLY_SET thermalHoles;

    // Test thermal stubs connections and add polygons to remove unconnected stubs.
    // (this is a refinement for thermal relief shapes)
    if( aZone->GetNetCode() > 0 )
    {
        buildUnconnectedThermalStubsPolygonList( thermalHoles, aZone, aFinalPolys,
                correctionFactor, s_thermalRot );

    }

    // remove copper areas corresponding to not connected stubs
    if( !thermalHoles.IsEmpty() )
    {
        thermalHoles.Simplify( SHAPE_POLY_SET::PM_FAST );
        // Remove unconnected stubs. Use SHAPE_POLY_SET::PM_STRICTLY_SIMPLE to
        // generate strictly simple polygons
        // needed by Gerber files and Fracture()
        solidAreas.BooleanSubtract( thermalHoles, SHAPE_POLY_SET::PM_STRICTLY_SIMPLE );

        if( s_DumpZonesWhenFilling )
            dumper->Write( &thermalHoles, "thermal-holes" );

        // put these areas in m_FilledPolysList
        SHAPE_POLY_SET th_fractured = solidAreas;
        th_fractured.Fracture( SHAPE_POLY_SET::PM_FAST );

        if( s_DumpZonesWhenFilling )
            dumper->Write( &th_fractured, "th_fractured" );

        aFinalPolys = th_fractured;
    }

    aRawPolys = aFinalPolys;

    if( s_DumpZonesWhenFilling )
        dumper->EndGroup();
}
void TransformRoundChamferedRectToPolygon( SHAPE_POLY_SET& aCornerBuffer,
                                  const wxPoint& aPosition, const wxSize& aSize,
                                  double aRotation, int aCornerRadius,
                                  double aChamferRatio, int aChamferCorners,
                                  int aCircleToSegmentsCount )
{
    // Build the basic shape in orientation 0.0, position 0,0 for chamfered corners
    // or in actual position/orientation for round rect only
    wxPoint corners[4];
    GetRoundRectCornerCenters( corners, aCornerRadius,
                               aChamferCorners ? wxPoint( 0, 0 ) : aPosition,
                               aSize, aChamferCorners ? 0.0 : aRotation );

    SHAPE_POLY_SET outline;
    outline.NewOutline();

    for( int ii = 0; ii < 4; ++ii )
        outline.Append( corners[ii].x, corners[ii].y );

    outline.Inflate( aCornerRadius, aCircleToSegmentsCount );

    if( aChamferCorners == RECT_NO_CHAMFER )      // no chamfer
    {
        // Add the outline:
        aCornerBuffer.Append( outline );
        return;
    }

    // Now we have the round rect outline, in position 0,0 orientation 0.0.
    // Chamfer the corner(s).
    int chamfer_value = aChamferRatio * std::min( aSize.x, aSize.y );

    SHAPE_POLY_SET chamfered_corner;    // corner shape for the current corner to chamfer

    int corner_id[4] =
    {
        RECT_CHAMFER_TOP_LEFT, RECT_CHAMFER_TOP_RIGHT,
        RECT_CHAMFER_BOTTOM_LEFT, RECT_CHAMFER_BOTTOM_RIGHT
    };
    // Depending on the corner position, signX[] and signY[] give the sign of chamfer
    // coordinates relative to the corner position
    // The first corner is the top left corner, then top right, bottom left and bottom right
    int signX[4] = {1, -1, 1,-1 };
    int signY[4] = {1, 1, -1,-1 };

    for( int ii = 0; ii < 4; ii++ )
    {
        if( (corner_id[ii] & aChamferCorners) == 0 )
            continue;

        VECTOR2I corner_pos( -signX[ii]*aSize.x/2, -signY[ii]*aSize.y/2 );

        if( aCornerRadius )
        {
            // We recreate a rectangular area covering the full rounded corner (max size = aSize/2)
            // to rebuild the corner before chamfering, to be sure the rounded corner shape does not
            // overlap the chamfered corner shape:
            chamfered_corner.RemoveAllContours();
            chamfered_corner.NewOutline();
            chamfered_corner.Append( 0, 0 );
            chamfered_corner.Append( 0, signY[ii]*aSize.y/2 );
            chamfered_corner.Append( signX[ii]*aSize.x/2, signY[ii]*aSize.y/2 );
            chamfered_corner.Append( signX[ii]*aSize.x/2, 0 );
            chamfered_corner.Move( corner_pos );
            outline.BooleanAdd( chamfered_corner, SHAPE_POLY_SET::PM_STRICTLY_SIMPLE );
        }

        // Now chamfer this corner
        chamfered_corner.RemoveAllContours();
        chamfered_corner.NewOutline();
        chamfered_corner.Append( 0, 0 );
        chamfered_corner.Append( 0, signY[ii]*chamfer_value );
        chamfered_corner.Append( signX[ii]*chamfer_value, 0 );
        chamfered_corner.Move( corner_pos );
        outline.BooleanSubtract( chamfered_corner, SHAPE_POLY_SET::PM_STRICTLY_SIMPLE );
    }

    // Rotate and move the outline:
    if( aRotation != 0.0 )
        outline.Rotate( DECIDEG2RAD( -aRotation ), VECTOR2I( 0, 0 ) );

    outline.Move( VECTOR2I( aPosition ) );

    // Add the outline:
    aCornerBuffer.Append( outline );
}