/*******************************************/ /* zones_convert_brd_items_to_polygons.cpp */ /*******************************************/ /* Functions to convert some board items to polygons * (pads, tracks ..) * This is used to calculate filled areas in copper zones. * Filled areas are areas remainder of the full zone area after removed all polygons * calculated from these items shapes and the clearance area * * Important note: * Because filled areas must have a minimum thickness to match with Design rule, they are draw in 2 step: * 1 - filled polygons are drawn * 2 - polygon outlines are drawn with a "minimum thickness width" ( or with a minimum thickness pen ) * So outlines of filled polygons are calculated with the constraint they match with clearance, * taking in account outlines have thickness * This ensures: * - areas meet the minimum thickness requirement. * - shapes are smoothed. */ #include #include #include "fctsys.h" #include "common.h" #include "pcbnew.h" #include "wxPcbStruct.h" #include "trigo.h" #include "zones.h" #include "PolyLine.h" // Kbool 1.9 and before had sometimes problemes when calculating thermal shapes as polygons (this is the best solution) // Kbool 2.0 has solved some problems, but not all // Kbool 2.1 has solved some others problems, but not all // Used to create data files to debug Kbool #include "debug_kbool_key_file_fct.h" // Also we can create test files for Kbool bebug purposes // when CREATE_KBOOL_KEY_FILES is defined // See debug_kbool_key_file_fct.h extern void Test_For_Copper_Island_And_Remove( BOARD* aPcb, ZONE_CONTAINER* aZone_container ); extern void CreateThermalReliefPadPolygon( std::vector& aCornerBuffer, D_PAD& aPad, int aThermalGap, int aCopperThickness, int aMinThicknessValue, int aCircleToSegmentsCount, double aCorrectionFactor, int aThermalRot ); // Local Functions: static void AddPolygonCornersToBoolengine( std::vector & aCornersBuffer, Bool_Engine* aBoolengine, GroupType aGroup ); // Local Variables: #ifdef CREATE_KBOOL_KEY_FILES_WITH_0_DEG static int s_thermalRot = 0; #else static int s_thermalRot = 450; // angle of stubs in thermal reliefs for round pads #endif /* how many segments are used to create a polygon from a circle: */ static int s_CircleToSegmentsCount = ARC_APPROX_SEGMENTS_COUNT_LOW_DEF; /* default value. the real value will be changed to * ARC_APPROX_SEGMENTS_COUNT_HIGHT_DEF * if m_ArcToSegmentsCount == ARC_APPROX_SEGMENTS_COUNT_HIGHT_DEF */ double s_Correction; /* mult coeff used to enlarge rounded and oval pads (and vias) * because the segment approximation for arcs and circles * create a smaller gap than a true circle */ /** * Function AddClearanceAreasPolygonsToPolysList * Supports a min thickness area constraint. * Add non copper areas polygons (pads and tracks with clearence) * 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 clearence areas * to do that this function: * 1 - creates a Bool_Engine,with option: holes are linked to outer contours by double overlapping segments * this means the created polygons have no holes (hole are linked to outer outline by double overlapped segments * and are therefore compatible with draw functions (DC draw polygons and Gerber or PS outputs) * 2 - Add the main outline (zone outline) in group A * 3 - Creates a correction using BOOL_CORRECTION operation 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 * 4 - recreates the same Bool_Engine, with no correction * 5 - Add the main modified outline (zone outline) in group A * 6 - Add all non filled areas (pads, tracks) in group B with a clearance of m_Clearance + m_ZoneMinThickness/2 * 7 - calculates the polygon A - B * 8 - put resulting list of polygons (filled areas) in m_FilledPolysList * This zone contains pads with the same net. * 9 - Remove insulated copper islands * 10 - If Thermal shapes are wanted, remove copper around pads in zone, in order to create thes thermal shapes * a - Creates a bool engine and add the last copper areas in group A * b - Add thermal shapes (non copper ares in group B * c - Calculates the polygon A - B * 11 - Remove new insulated copper islands */ /* Important note: * One can add thermal areas in the step 6, with others items to substract. * It is faster. * But : * kbool fails sometimes in this case * The separate step to make thermal shapes allows a more sophisticated algorith (todo) * like remove thermal copper bridges in thermal shapes that are not connected to an area */ void ZONE_CONTAINER::AddClearanceAreasPolygonsToPolysList( BOARD* aPcb ) { // Set the number of segments in arc approximations if( m_ArcToSegmentsCount == ARC_APPROX_SEGMENTS_COUNT_HIGHT_DEF ) s_CircleToSegmentsCount = ARC_APPROX_SEGMENTS_COUNT_HIGHT_DEF; else s_CircleToSegmentsCount = 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 ) */ s_Correction = 1.0 / cos( 3.14159265 / s_CircleToSegmentsCount ); /* Uses a kbool engine to add holes in the m_FilledPolysList polygon. * Because this function is called just after creating the m_FilledPolysList, * only one polygon is in list. * (initial holes in zones are linked into outer contours by double overlapping segments). * because after adding holes, many polygons could be exist in this list. */ Bool_Engine* booleng = new Bool_Engine(); ArmBoolEng( booleng, true ); /* First, Add the main polygon (i.e. the filled area using only one outline) * in GroupA in Bool_Engine to do a BOOL_CORRECTION operation * to reserve a m_ZoneMinThickness/2 margind around the outlines and holes * the margin will be filled when redraw outilnes with segments having a width set to * m_ZoneMinThickness * so m_ZoneMinThickness is the min thickness of the filled zones areas */ CopyPolygonsFromFilledPolysListToBoolengine( booleng, GROUP_A ); booleng->SetCorrectionFactor( (double) -m_ZoneMinThickness / 2 ); booleng->Do_Operation( BOOL_CORRECTION ); /* Now copy the new outline in m_FilledPolysList */ m_FilledPolysList.clear(); CopyPolygonsFromBoolengineToFilledPolysList( booleng ); delete booleng; if( m_FilledPolysList.size() == 0 ) return; /* Second, Add the main (corrected) polygon (i.e. the filled area using only one outline) * in GroupA in Bool_Engine to do a BOOL_A_SUB_B operation * All areas to remove will be put in GroupB in Bool_Engine */ booleng = new Bool_Engine(); ArmBoolEng( booleng, true ); /* Calculates the clearance value that meet DRC requirements * from m_ZoneClearance and clearance from the corresponding netclass * We have a "local" clearance in zones because most of time * clearance between a zone and others items is bigger than the netclass clearance * this is more true for small clearance values * Note also the "local" clearance is used for clearance between non copper items * or items like texts on copper layers */ int margin = m_ZoneMinThickness / 2; int zone_clearance = max( m_ZoneClearance, GetClearance() ); zone_clearance += margin; /* Add holes (i.e. tracks and pads areas as polygons outlines) * in GroupB in Bool_Engine */ /* items ouside the zone bounding box are skipped * the bounding box is the zone bounding box + the biggest clearance found in Netclass list */ EDA_Rect item_boundingbox; EDA_Rect zone_boundingbox = GetBoundingBox(); int biggest_clearance = aPcb->GetBiggestClearanceValue(); biggest_clearance = MAX( biggest_clearance, zone_clearance ); zone_boundingbox.Inflate( biggest_clearance ); #ifdef CREATE_KBOOL_KEY_FILES_FIRST_PASS CreateKeyFile(); OpenKeyFileEntity( "Layer_fp" ); CopyPolygonsFromFilledPolysListToKeyFile( this, 0 ); #endif /* * First : Add pads. Note: pads having the same net as zone are left in zone. * Thermal shapes will be created later if necessary */ int item_clearance; // static to avoid unnecessary memory allocation when filling many zones. static std::vector cornerBufferPolysToSubstract; cornerBufferPolysToSubstract.clear(); /* Use a dummy pad to calculate hole clerance when a pad is not on all copper layers * and this pad has a hole * This dummy pad has the size and shape of the hole * Therefore, this dummy pad is a circle or an oval. * A pad must have a parent because some functions expect a non null parent * to find the parent board, and some other data */ MODULE dummymodule( aPcb ); // Creates a dummy parent D_PAD dummypad( &dummymodule ); D_PAD* nextpad; for( MODULE* module = aPcb->m_Modules; module; module = module->Next() ) { for( D_PAD* pad = module->m_Pads; pad != NULL; pad = nextpad ) { nextpad = pad->Next(); // pad pointer can be modified by next code, so calculate the next pad here if( !pad->IsOnLayer( GetLayer() ) ) { /* Test fo pads that are on top or bottom only and have a hole. * There are curious pads but they can be used for some components that are inside the * board (in fact inside the hole. Some photo diodes and Leds are like this) */ if( (pad->m_Drill.x == 0) && (pad->m_Drill.y == 0) ) continue; // Use a dummy pad to calculate a hole shape that have the same dimension as the pad hole dummypad.m_Size = pad->m_Drill; dummypad.m_Orient = pad->m_Orient; dummypad.m_PadShape = pad->m_DrillShape; dummypad.m_Pos = pad->m_Pos; pad = &dummypad; } if( pad->GetNet() != GetNet() ) { item_clearance = pad->GetClearance() + margin; item_boundingbox = pad->GetBoundingBox(); if( item_boundingbox.Intersects( zone_boundingbox ) ) { int clearance = MAX( zone_clearance, item_clearance ); pad->TransformShapeWithClearanceToPolygon( cornerBufferPolysToSubstract, clearance, s_CircleToSegmentsCount, s_Correction ); } continue; } int gap = zone_clearance; if( (m_PadOption == PAD_NOT_IN_ZONE) || (GetNet() == 0) || pad->m_PadShape == PAD_TRAPEZOID ) // PAD_TRAPEZOID shapes are not in zones because they are used in microwave apps // and i think it is good that shapes are not changed by thermal pads or others { item_boundingbox = pad->GetBoundingBox(); if( item_boundingbox.Intersects( zone_boundingbox ) ) { pad->TransformShapeWithClearanceToPolygon( cornerBufferPolysToSubstract, gap, s_CircleToSegmentsCount, s_Correction ); } } } } /* Add holes (i.e. tracks and vias areas as polygons outlines) * in cornerBufferPolysToSubstract */ for( TRACK* track = aPcb->m_Track; track; track = track->Next() ) { if( !track->IsOnLayer( GetLayer() ) ) continue; if( track->GetNet() == GetNet() && (GetNet() != 0) ) continue; item_clearance = track->GetClearance() + margin; item_boundingbox = track->GetBoundingBox(); if( item_boundingbox.Intersects( zone_boundingbox ) ) { int clearance = MAX( zone_clearance, item_clearance ); track->TransformShapeWithClearanceToPolygon( cornerBufferPolysToSubstract, clearance, s_CircleToSegmentsCount, s_Correction ); } } /* Add module edge items that are on copper layers * Pcbnew allows these items to be on copper layers in microwvae applictions * This is a bad thing, but must be handle here, until a better way is found */ for( MODULE* module = aPcb->m_Modules; module; module = module->Next() ) { for( BOARD_ITEM* item = module->m_Drawings; item; item = item->Next() ) { if( !item->IsOnLayer( GetLayer() ) ) continue; if( item->Type() != TYPE_EDGE_MODULE ) continue; item_boundingbox = item->GetBoundingBox(); if( item_boundingbox.Intersects( zone_boundingbox ) ) { ( (EDGE_MODULE*) item )->TransformShapeWithClearanceToPolygon( cornerBufferPolysToSubstract, m_ZoneClearance, s_CircleToSegmentsCount, s_Correction ); } } } // Add graphic items (copper texts) and board edges for( BOARD_ITEM* item = aPcb->m_Drawings; item; item = item->Next() ) { if( item->GetLayer() != GetLayer() && item->GetLayer() != EDGE_N ) continue; switch( item->Type() ) { case TYPE_DRAWSEGMENT: ( (DRAWSEGMENT*) item )->TransformShapeWithClearanceToPolygon( cornerBufferPolysToSubstract, m_ZoneClearance, s_CircleToSegmentsCount, s_Correction ); break; case TYPE_TEXTE: ( (TEXTE_PCB*) item )->TransformShapeWithClearanceToPolygon( cornerBufferPolysToSubstract, m_ZoneClearance, s_CircleToSegmentsCount, s_Correction ); break; default: break; } } // cornerBufferPolysToSubstract contains polygons to substract, // prepare booleng to do that: AddPolygonCornersToBoolengine( cornerBufferPolysToSubstract, booleng, GROUP_B ); #ifdef CREATE_KBOOL_KEY_FILES_FIRST_PASS for( unsigned icnt = 0; icnt < cornerBuffer.size(); ) { StartKeyFilePolygon( 1 ); for( ii = icnt; ii < cornerBuffer.size(); ii++ ) { AddKeyFilePointXY( cornerBufferPolysToSubstract[ii].x, cornerBufferPolysToSubstract[ii].y ); if( cornerBufferPolysToSubstract[ii].end_contour ) break; } EndKeyFilePolygon(); icnt = ii + 1; } CloseKeyFileEntity(); CloseKeyFile(); #endif /* calculates copper areas */ if( cornerBufferPolysToSubstract.size() > 0 ) { /* Add the main corrected polygon (i.e. the filled area using only one outline) * in GroupA in Bool_Engine */ CopyPolygonsFromFilledPolysListToBoolengine( booleng, GROUP_A ); booleng->Do_Operation( BOOL_A_SUB_B ); /* put these areas in m_FilledPolysList */ m_FilledPolysList.clear(); CopyPolygonsFromBoolengineToFilledPolysList( booleng ); } delete booleng; // Remove insulated islands: if( GetNet() > 0 ) Test_For_Copper_Island_And_Remove_Insulated_Islands( aPcb ); // remove thermal gaps if required: if( m_PadOption != THERMAL_PAD || aPcb->m_Modules == NULL ) return; // Remove thermal symbols cornerBufferPolysToSubstract.clear(); if( m_PadOption == THERMAL_PAD ) { booleng = new Bool_Engine(); ArmBoolEng( booleng, true ); #ifdef CREATE_KBOOL_KEY_FILES CreateKeyFile(); OpenKeyFileEntity( "Layer" ); CopyPolygonsFromFilledPolysListToKeyFile( this, 0 ); #endif for( MODULE* module = aPcb->m_Modules; module; module = module->Next() ) { for( D_PAD* pad = module->m_Pads; pad != NULL; pad = pad->Next() ) { if( !pad->IsOnLayer( GetLayer() ) ) continue; if( pad->GetNet() != GetNet() ) continue; item_boundingbox = pad->GetBoundingBox(); item_boundingbox.Inflate( m_ThermalReliefGapValue ); if( item_boundingbox.Intersects( zone_boundingbox ) ) { CreateThermalReliefPadPolygon( cornerBufferPolysToSubstract, *pad, m_ThermalReliefGapValue, m_ThermalReliefCopperBridgeValue, m_ZoneMinThickness, s_CircleToSegmentsCount, s_Correction, s_thermalRot ); } } } if( cornerBufferPolysToSubstract.size() ) { /* Add the main corrected polygon (i.e. the filled area using only one outline) * in GroupA in Bool_Engine */ CopyPolygonsFromFilledPolysListToBoolengine( booleng, GROUP_A ); // cornerBufferPolysToSubstract contains polygons to substract, // prepare booleng to do that: AddPolygonCornersToBoolengine( cornerBufferPolysToSubstract, booleng, GROUP_B ); /* remove thermal areas (non copper areas) */ booleng->Do_Operation( BOOL_A_SUB_B ); /* put these areas in m_FilledPolysList */ m_FilledPolysList.clear(); CopyPolygonsFromBoolengineToFilledPolysList( booleng ); } delete booleng; // Remove insulated islands: if( GetNet() > 0 ) Test_For_Copper_Island_And_Remove_Insulated_Islands( aPcb ); #ifdef CREATE_KBOOL_KEY_FILES for( unsigned icnt = 0; icnt < cornerBufferPolysToSubstract.size(); ) { StartKeyFilePolygon( 1 ); for( ii = icnt; ii < cornerBufferPolysToSubstract.size(); ii++ ) { AddKeyFilePointXY( cornerBufferPolysToSubstract[ii].x, cornerBufferPolysToSubstract[ii].y ); if( cornerBufferPolysToSubstract[ii].end_contour ) break; } EndKeyFilePolygon(); icnt = ii + 1; } } CloseKeyFileEntity(); CloseKeyFile(); #endif } // Now we remove all unused thermal stubs. #define REMOVE_UNUSED_THERMAL_STUBS // Can be commented to skip unused thermal stubs calculations #ifdef REMOVE_UNUSED_THERMAL_STUBS booleng = new Bool_Engine(); ArmBoolEng( booleng, true ); cornerBufferPolysToSubstract.clear(); // Test thermal stubs connections and add polygons to remove unconnected stubs. for( MODULE* module = aPcb->m_Modules; module; module = module->Next() ) { for( D_PAD* pad = module->m_Pads; pad != NULL; pad = pad->Next() ) { // check if( !pad->IsOnLayer( GetLayer() ) ) continue; if( pad->GetNet() != GetNet() ) continue; item_boundingbox = pad->GetBoundingBox(); item_boundingbox.Inflate( m_ThermalReliefGapValue ); if( !( item_boundingbox.Intersects( zone_boundingbox ) ) ) continue; // test point int dx = ( pad->m_Size.x / 2 ) + m_ThermalReliefGapValue; int dy = ( pad->m_Size.y / 2 ) + m_ThermalReliefGapValue; // This is CIRCLE pad tweak (for circle pads the thermal stubs are at 45 deg) int fAngle = pad->m_Orient; if( pad->m_PadShape == PAD_CIRCLE ) { dx = (int) ( dx * s_Correction ); dy = dx; fAngle = s_thermalRot; } // compute north, south, west and east points for zone connection. // Add a small value to ensure point is inside (or outside) zone, not on an edge wxPoint ptTest[4]; ptTest[0] = wxPoint( 0, 3 + dy + margin ); ptTest[1] = wxPoint( 0, -(3 + dy + margin) ); ptTest[2] = wxPoint( 3 + dx + margin, 0 ); ptTest[3] = wxPoint( -(3 + dx + margin), 0 ); // Test all sides for( int i = 0; i<4; i++ ) { // rotate point RotatePoint( &ptTest[i], fAngle ); // translate point ptTest[i] += pad->ReturnShapePos(); bool inside = HitTestFilledArea( ptTest[i] ); if( inside == false ) { // polygon buffer std::vector corners_buffer; // polygons are rectangles with width of copper bridge value // contour line width has to be taken into calculation to avoid "thermal stub bleed" const int iDTRC = ( m_ThermalReliefCopperBridgeValue - m_ZoneMinThickness ) / 2; switch( i ) { case 0: corners_buffer.push_back( wxPoint( -iDTRC, dy ) ); corners_buffer.push_back( wxPoint( +iDTRC, dy ) ); corners_buffer.push_back( wxPoint( +iDTRC, iDTRC ) ); corners_buffer.push_back( wxPoint( -iDTRC, iDTRC ) ); break; case 1: corners_buffer.push_back( wxPoint( -iDTRC, -dy ) ); corners_buffer.push_back( wxPoint( +iDTRC, -dy ) ); corners_buffer.push_back( wxPoint( +iDTRC, -iDTRC ) ); corners_buffer.push_back( wxPoint( -iDTRC, -iDTRC ) ); break; case 2: corners_buffer.push_back( wxPoint( dx, -iDTRC ) ); corners_buffer.push_back( wxPoint( dx, iDTRC ) ); corners_buffer.push_back( wxPoint( +iDTRC, iDTRC ) ); corners_buffer.push_back( wxPoint( +iDTRC, -iDTRC ) ); break; case 3: corners_buffer.push_back( wxPoint( -dx, -iDTRC ) ); corners_buffer.push_back( wxPoint( -dx, iDTRC ) ); corners_buffer.push_back( wxPoint( -iDTRC, iDTRC ) ); corners_buffer.push_back( wxPoint( -iDTRC, -iDTRC ) ); break; } // add computed polygon to list for( unsigned ic = 0; ic < corners_buffer.size(); ic++ ) { wxPoint cpos = corners_buffer[ic]; RotatePoint( &cpos, fAngle ); // Rotate according to module orientation cpos += pad->ReturnShapePos(); // Shift origin to position CPolyPt corner; corner.x = cpos.x; corner.y = cpos.y; corner.end_contour = ( ic < (corners_buffer.size() - 1) ) ? 0 : 1; cornerBufferPolysToSubstract.push_back( corner ); } } } } } /* compute copper areas */ if( cornerBufferPolysToSubstract.size() ) { /* Add the main corrected polygon (i.e. the filled area using only one outline) * in GroupA in Bool_Engine */ CopyPolygonsFromFilledPolysListToBoolengine( booleng, GROUP_A ); AddPolygonCornersToBoolengine( cornerBufferPolysToSubstract, booleng, GROUP_B ); booleng->Do_Operation( BOOL_A_SUB_B ); /* put these areas in m_FilledPolysList */ m_FilledPolysList.clear(); CopyPolygonsFromBoolengineToFilledPolysList( booleng ); // Remove insulated islands, if any: if( GetNet() > 0 ) Test_For_Copper_Island_And_Remove_Insulated_Islands( aPcb ); } delete booleng; #endif // REMOVE_UNUSED_THERMAL_STUBS } /** AddPolygonCornersToBoolengine * copy a set of polygons in a kbool engine * @param aCornersBuffer = list of polygons defined by corners. * @ param aBoolengine = the kbool engine to populate * @ param aGroup = GROUP_A or GROUP_B */ void AddPolygonCornersToBoolengine( std::vector & aCornersBuffer, Bool_Engine* aBoolengine, GroupType aGroup ) { unsigned ii; for( unsigned icnt = 0; icnt < aCornersBuffer.size(); ) { aBoolengine->StartPolygonAdd( aGroup ); for( ii = icnt; ii < aCornersBuffer.size(); ii++ ) { aBoolengine->AddPoint( aCornersBuffer[ii].x, aCornersBuffer[ii].y ); if( aCornersBuffer[ii].end_contour ) break; } aBoolengine->EndPolygonAdd(); icnt = ii + 1; } } /***********************************************************************************************************/ int ZONE_CONTAINER::CopyPolygonsFromFilledPolysListToBoolengine( Bool_Engine* aBoolengine, GroupType aGroup ) /************************************************************************************************************/ /** * Function CopyPolygonsFromFilledPolysListToBoolengine * Copy (Add) polygons found in m_FilledPolysList to kbool BoolEngine * m_FilledPolysList may have more than one polygon * @param aBoolengine = kbool engine * @param aGroup = group in kbool engine (GROUP_A or GROUP_B only) * @return the corner count */ { unsigned corners_count = m_FilledPolysList.size(); int count = 0; unsigned ic = 0; while( ic < corners_count ) { if( aBoolengine->StartPolygonAdd( aGroup ) ) { for( ; ic < corners_count; ic++ ) { CPolyPt* corner = &m_FilledPolysList[ic]; aBoolengine->AddPoint( corner->x, corner->y ); count++; if( corner->end_contour ) { ic++; break; } } aBoolengine->EndPolygonAdd(); } } return count; } /*****************************************************************************************/ int ZONE_CONTAINER::CopyPolygonsFromBoolengineToFilledPolysList( Bool_Engine* aBoolengine ) /*****************************************************************************************/ /** * Function CopyPolygonsFromBoolengineToFilledPolysList * Copy (Add) polygons created by kbool (after Do_Operation) to m_FilledPolysList * @param aBoolengine = kbool engine * @return the corner count */ { int count = 0; while( aBoolengine->StartPolygonGet() ) { CPolyPt corner( 0, 0, false ); while( aBoolengine->PolygonHasMorePoints() ) { corner.x = (int) aBoolengine->GetPolygonXPoint(); corner.y = (int) aBoolengine->GetPolygonYPoint(); corner.end_contour = false; // Flag this corner if starting a hole connection segment: // This is used by draw functions to draw only useful segments (and not extra segments) corner.utility = (aBoolengine->GetPolygonPointEdgeType() == KB_FALSE_EDGE) ? 1 : 0; m_FilledPolysList.push_back( corner ); count++; } corner.end_contour = true; m_FilledPolysList.pop_back(); m_FilledPolysList.push_back( corner ); aBoolengine->EndPolygonGet(); } return count; }