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kicad/pcbnew/zone_filling_algorithm.cpp

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/**
* @file zone_filling_algorithm.cpp:
* Algorithms used to fill a zone defined by a polygon and a filling starting point.
*/
/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2016 Jean-Pierre Charras, jp.charras at wanadoo.fr
* Copyright (C) 1992-2016 KiCad Developers, see AUTHORS.txt for contributors.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <algorithm> // sort
#include <cmath>
#include <sstream>
#include <fctsys.h>
#include <wxPcbStruct.h>
#include <trigo.h>
#include <class_board.h>
#include <class_module.h>
#include <class_track.h>
#include <class_edge_mod.h>
#include <class_drawsegment.h>
#include <class_pcb_text.h>
#include <class_zone.h>
#include <project.h>
#include <pcbnew.h>
#include <zones.h>
#include <convert_basic_shapes_to_polygon.h>
#include <geometry/shape_poly_set.h>
#include <geometry/shape_file_io.h>
#include <geometry/convex_hull.h>
#include <connectivity_data.h>
/* 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.
*/
// Polygon calculations can use fast mode or force strickly simple polygons after calculations
// Forcing strickly simple polygons is time consuming, and we have not see issues in fast mode
// so we use fast mode when possible (intermediate calculations)
// (choice is SHAPE_POLY_SET::PM_STRICTLY_SIMPLE or SHAPE_POLY_SET::PM_FAST)
#define POLY_CALC_MODE SHAPE_POLY_SET::PM_FAST
/* DEBUG OPTION:
* To emit zone data to a file when filling zones for the debugging purposes,
* set this 'true' and build.
*/
static const bool s_DumpZonesWhenFilling = false;
extern void BuildUnconnectedThermalStubsPolygonList( SHAPE_POLY_SET& aCornerBuffer,
BOARD* aPcb, ZONE_CONTAINER* aZone,
double aArcCorrection,
double aRoundPadThermalRotation);
extern void CreateThermalReliefPadPolygon( SHAPE_POLY_SET& aCornerBuffer,
D_PAD& aPad,
int aThermalGap,
int aCopperThickness,
int aMinThicknessValue,
int aCircleToSegmentsCount,
double aCorrectionFactor,
double aThermalRot );
// Local Variables:
static double s_thermalRot = 450; // angle of stubs in thermal reliefs for round pads
/* Build the filled solid areas data from real outlines (stored in m_Poly)
* The solid areas can be more than one on copper layers, and do not have holes
( holes are linked by overlapping segments to the main outline)
* aPcb: the current board (can be NULL for non copper zones)
* aCornerBuffer: A reference to a buffer to store polygon corners, or NULL
* if aCornerBuffer == NULL:
* - m_FilledPolysList is used to store solid areas polygons.
* - on copper layers, tracks and other items shapes of other nets are
* removed from solid areas
* if not null:
* Only the zone outline (with holes, if any) are stored in aCornerBuffer
* with holes linked. Therefore only one polygon is created
* This function calls ComputeRawFilledAreas()
* to add holes for pads and tracks and other items not in net.
*/
bool ZONE_CONTAINER::BuildFilledSolidAreasPolygons( BOARD* aPcb, SHAPE_POLY_SET* aOutlineBuffer )
{
/* convert outlines + holes to outlines without holes (adding extra segments if necessary)
* m_Poly data is expected normalized, i.e. NormalizeAreaOutlines was used after building
* this zone
*/
if( GetNumCorners() <= 2 ) // malformed zone. polygon calculations do not like it ...
return false;
// Make a smoothed polygon out of the user-drawn polygon if required
if( m_smoothedPoly )
{
delete m_smoothedPoly;
m_smoothedPoly = NULL;
}
switch( m_cornerSmoothingType )
{
case ZONE_SETTINGS::SMOOTHING_CHAMFER:
m_smoothedPoly = new SHAPE_POLY_SET();
*m_smoothedPoly = m_Poly->Chamfer( m_cornerRadius );
break;
case ZONE_SETTINGS::SMOOTHING_FILLET:
m_smoothedPoly = new SHAPE_POLY_SET();
*m_smoothedPoly = m_Poly->Fillet( m_cornerRadius, m_ArcToSegmentsCount );
break;
default:
// Acute angles between adjacent edges can create issues in calculations,
// in inflate/deflate outlines transforms, especially when the angle is very small.
// We can avoid issues by creating a very small chamfer which remove acute angles,
// or left it without chamfer and use only CPOLYGONS_LIST::InflateOutline to create
// clearance areas
m_smoothedPoly = new SHAPE_POLY_SET();
*m_smoothedPoly = m_Poly->Chamfer( Millimeter2iu( 0.0 ) );
break;
}
if( aOutlineBuffer )
aOutlineBuffer->Append( *m_smoothedPoly );
/* For copper layers, we now must add holes in the Polygon list.
* holes are pads and tracks with their clearance area
* For non copper layers, just recalculate the m_FilledPolysList
* with m_ZoneMinThickness taken in account
*/
else
{
m_FilledPolysList.RemoveAllContours();
if( IsOnCopperLayer() )
{
ComputeRawFilledAreas( aPcb );
if( m_FillMode ) // if fill mode uses segments, create them:
{
if( !FillZoneAreasWithSegments() )
return false;
}
}
else
{
m_FillMode = 0; // Fill by segments is no more used in non copper layers
// force use solid polygons (usefull only for old boards)
m_FilledPolysList = *m_smoothedPoly;
// The filled areas are deflated by -m_ZoneMinThickness / 2, because
// the outlines are drawn with a line thickness = m_ZoneMinThickness to
// give a good shape with the minimal thickness
m_FilledPolysList.Inflate( -m_ZoneMinThickness / 2, 16 );
m_FilledPolysList.Fracture( SHAPE_POLY_SET::PM_FAST );
}
m_IsFilled = true;
}
return true;
}
/** Helper function fillPolygonWithHorizontalSegments
* fills a polygon with horizontal segments.
* It can be used for any angle, if the zone outline to fill is rotated by this angle
* and the result is rotated by -angle
* @param aPolygon = a SHAPE_LINE_CHAIN polygon to fill
* @param aFillSegmList = a std::vector\<SEGMENT\> which will be populated by filling segments
* @param aStep = the horizontal grid size
*/
bool fillPolygonWithHorizontalSegments( const SHAPE_LINE_CHAIN& aPolygon,
std::vector <SEGMENT>& aFillSegmList, int aStep );
bool ZONE_CONTAINER::FillZoneAreasWithSegments()
{
bool success = true;
// segments are on something like a grid. Give it a minimal size
// to avoid too many segments, and use the m_ZoneMinThickness when (this is usually the case)
// the size is > mingrid_size.
// This is not perfect, but the actual purpose of this code
// is to allow filling zones on a grid, with grid size > m_ZoneMinThickness,
// in order to have really a grid.
//
// Using a user selectable grid size is for future Kicad versions.
// For now the area is fully filled.
int mingrid_size = Millimeter2iu( 0.05 );
int grid_size = std::max( mingrid_size, m_ZoneMinThickness );
// Make segments slightly overlapping to ensure a good full filling
grid_size -= grid_size/20;
// All filled areas are in m_FilledPolysList
// m_FillSegmList will contain the horizontal and vertical segments
// the segment width is m_ZoneMinThickness.
m_FillSegmList.clear();
// Creates the horizontal segments
for ( int index = 0; index < m_FilledPolysList.OutlineCount(); index++ )
{
const SHAPE_LINE_CHAIN& outline0 = m_FilledPolysList.COutline( index );
success = fillPolygonWithHorizontalSegments( outline0, m_FillSegmList, grid_size );
if( !success )
break;
// Creates the vertical segments. Because the filling algo creates horizontal segments,
// to reuse the fillPolygonWithHorizontalSegments function, we rotate the polygons to fill
// then fill them, then inverse rotate the result
SHAPE_LINE_CHAIN outline90;
outline90.Append( outline0 );
// Rotate 90 degrees the outline:
for( int ii = 0; ii < outline90.PointCount(); ii++ )
{
VECTOR2I& point = outline90.Point( ii );
std::swap( point.x, point.y );
point.y = -point.y;
}
int first_point = m_FillSegmList.size();
success = fillPolygonWithHorizontalSegments( outline90, m_FillSegmList, grid_size );
if( !success )
break;
// Rotate -90 degrees the segments:
for( unsigned ii = first_point; ii < m_FillSegmList.size(); ii++ )
{
SEGMENT& segm = m_FillSegmList[ii];
std::swap( segm.m_Start.x, segm.m_Start.y );
std::swap( segm.m_End.x, segm.m_End.y );
segm.m_Start.x = - segm.m_Start.x;
segm.m_End.x = - segm.m_End.x;
}
}
if( success )
m_IsFilled = true;
else
m_FillSegmList.clear();
return success;
}
bool fillPolygonWithHorizontalSegments( const SHAPE_LINE_CHAIN& aPolygon,
std::vector <SEGMENT>& aFillSegmList, int aStep )
{
std::vector <int> x_coordinates;
bool success = true;
// Creates the horizontal segments
const SHAPE_LINE_CHAIN& outline = aPolygon;
const BOX2I& rect = outline.BBox();
// Calculate the y limits of the zone
for( int refy = rect.GetY(), endy = rect.GetBottom(); refy < endy; refy += aStep )
{
// find all intersection points of an infinite line with polyline sides
x_coordinates.clear();
for( int v = 0; v < outline.PointCount(); v++ )
{
int seg_startX = outline.CPoint( v ).x;
int seg_startY = outline.CPoint( v ).y;
int seg_endX = outline.CPoint( v + 1 ).x;
int seg_endY = outline.CPoint( v + 1 ).y;
/* Trivial cases: skip if ref above or below the segment to test */
if( ( seg_startY > refy ) && ( seg_endY > refy ) )
continue;
// segment below ref point, or its Y end pos on Y coordinate ref point: skip
if( ( seg_startY <= refy ) && (seg_endY <= refy ) )
continue;
/* at this point refy is between seg_startY and seg_endY
* see if an horizontal line at Y = refy is intersecting this segment
*/
// calculate the x position of the intersection of this segment and the
// infinite line this is more easier if we move the X,Y axis origin to
// the segment start point:
seg_endX -= seg_startX;
seg_endY -= seg_startY;
double newrefy = (double) ( refy - seg_startY );
double intersec_x;
if ( seg_endY == 0 ) // horizontal segment on the same line: skip
continue;
// Now calculate the x intersection coordinate of the horizontal line at
// y = newrefy and the segment from (0,0) to (seg_endX,seg_endY) with the
// horizontal line at the new refy position the line slope is:
// slope = seg_endY/seg_endX; and inv_slope = seg_endX/seg_endY
// and the x pos relative to the new origin is:
// intersec_x = refy/slope = refy * inv_slope
// Note: because horizontal segments are already tested and skipped, slope
// exists (seg_end_y not O)
double inv_slope = (double) seg_endX / seg_endY;
intersec_x = newrefy * inv_slope;
x_coordinates.push_back( (int) intersec_x + seg_startX );
}
// A line scan is finished: build list of segments
// Sort intersection points by increasing x value:
// So 2 consecutive points are the ends of a segment
std::sort( x_coordinates.begin(), x_coordinates.end() );
// An even number of coordinates is expected, because a segment has 2 ends.
// An if this algorithm always works, it must always find an even count.
if( ( x_coordinates.size() & 1 ) != 0 )
{
success = false;
break;
}
// Create segments having the same Y coordinate
int iimax = x_coordinates.size() - 1;
for( int ii = 0; ii < iimax; ii += 2 )
{
wxPoint seg_start, seg_end;
seg_start.x = x_coordinates[ii];
seg_start.y = refy;
seg_end.x = x_coordinates[ii + 1];
seg_end.y = refy;
SEGMENT segment( seg_start, seg_end );
aFillSegmList.push_back( segment );
}
} // End examine segments in one area
return success;
}
void ZONE_CONTAINER::buildFeatureHoleList( BOARD* aPcb, SHAPE_POLY_SET& aFeatures )
{
int segsPerCircle;
double correctionFactor;
// 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 );
aFeatures.RemoveAllContours();
int outline_half_thickness = m_ZoneMinThickness / 2;
// When removing holes, the holes must be expanded by outline_half_thickness
// to take in account the thickness of the zone outlines
int zone_clearance = GetClearance() + outline_half_thickness;
// When holes are created by non copper items (edge cut items), use only
// the m_ZoneClearance parameter (zone clearance with no netclass clearance)
int zone_to_edgecut_clearance = GetZoneClearance() + outline_half_thickness;
/* store holes (i.e. tracks and pads areas as polygons outlines)
* in a polygon list
*/
/* 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->GetDesignSettings().GetBiggestClearanceValue();
biggest_clearance = std::max( biggest_clearance, zone_clearance );
zone_boundingbox.Inflate( biggest_clearance );
/*
* First : Add pads. Note: pads having the same net as zone are left in zone.
* Thermal shapes will be created later if necessary
*/
/* Use a dummy pad to calculate hole clearance 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 );
for( MODULE* module = aPcb->m_Modules; module; module = module->Next() )
{
D_PAD* nextpad;
for( D_PAD* pad = module->PadsList(); 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 for 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->GetDrillSize().x == 0 && pad->GetDrillSize().y == 0 )
continue;
// Use a dummy pad to calculate a hole shape that have the same dimension as
// the pad hole
dummypad.SetSize( pad->GetDrillSize() );
dummypad.SetOrientation( pad->GetOrientation() );
dummypad.SetShape( pad->GetDrillShape() == PAD_DRILL_SHAPE_OBLONG ?
PAD_SHAPE_OVAL : PAD_SHAPE_CIRCLE );
dummypad.SetPosition( pad->GetPosition() );
pad = &dummypad;
}
// Note: netcode <=0 means not connected item
if( ( pad->GetNetCode() != GetNetCode() ) || ( pad->GetNetCode() <= 0 ) )
{
int item_clearance = pad->GetClearance() + outline_half_thickness;
item_boundingbox = pad->GetBoundingBox();
item_boundingbox.Inflate( item_clearance );
if( item_boundingbox.Intersects( zone_boundingbox ) )
{
int clearance = std::max( zone_clearance, item_clearance );
// PAD_SHAPE_CUSTOM can have a specific keepout, to avoid to break the shape
if( pad->GetShape() == PAD_SHAPE_CUSTOM &&
pad->GetCustomShapeInZoneOpt() == CUST_PAD_SHAPE_IN_ZONE_CONVEXHULL )
{
// the pad shape in zone can be its convex hull or
// the shape itself
SHAPE_POLY_SET outline( pad->GetCustomShapeAsPolygon() );
outline.Inflate( KiROUND( clearance*correctionFactor) , segsPerCircle );
pad->CustomShapeAsPolygonToBoardPosition( &outline,
pad->GetPosition(), pad->GetOrientation() );
if( pad->GetCustomShapeInZoneOpt() == CUST_PAD_SHAPE_IN_ZONE_CONVEXHULL )
{
std::vector<wxPoint> convex_hull;
BuildConvexHull( convex_hull, outline );
aFeatures.NewOutline();
for( unsigned ii = 0; ii < convex_hull.size(); ++ii )
aFeatures.Append( convex_hull[ii] );
}
else
aFeatures.Append( outline );
}
else
pad->TransformShapeWithClearanceToPolygon( aFeatures,
clearance,
segsPerCircle,
correctionFactor );
}
continue;
}
// Pads are removed from zone if the setup is PAD_ZONE_CONN_NONE
// or if they have a custom shape, because a thermal relief will break
// the shape
if( GetPadConnection( pad ) == PAD_ZONE_CONN_NONE ||
pad->GetShape() == PAD_SHAPE_CUSTOM )
{
int gap = zone_clearance;
int thermalGap = GetThermalReliefGap( pad );
gap = std::max( gap, thermalGap );
item_boundingbox = pad->GetBoundingBox();
item_boundingbox.Inflate( gap );
if( item_boundingbox.Intersects( zone_boundingbox ) )
{
// PAD_SHAPE_CUSTOM has a specific keepout, to avoid to break the shape
// the pad shape in zone can be its convex hull or the shape itself
if( pad->GetShape() == PAD_SHAPE_CUSTOM &&
pad->GetCustomShapeInZoneOpt() == CUST_PAD_SHAPE_IN_ZONE_CONVEXHULL )
{
// the pad shape in zone can be its convex hull or
// the shape itself
SHAPE_POLY_SET outline( pad->GetCustomShapeAsPolygon() );
outline.Inflate( KiROUND( gap*correctionFactor) , segsPerCircle );
pad->CustomShapeAsPolygonToBoardPosition( &outline,
pad->GetPosition(), pad->GetOrientation() );
std::vector<wxPoint> convex_hull;
BuildConvexHull( convex_hull, outline );
aFeatures.NewOutline();
for( unsigned ii = 0; ii < convex_hull.size(); ++ii )
aFeatures.Append( convex_hull[ii] );
}
else
pad->TransformShapeWithClearanceToPolygon( aFeatures,
gap, segsPerCircle, correctionFactor );
}
}
}
}
/* 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->GetNetCode() == GetNetCode() && (GetNetCode() != 0) )
continue;
int item_clearance = track->GetClearance() + outline_half_thickness;
item_boundingbox = track->GetBoundingBox();
if( item_boundingbox.Intersects( zone_boundingbox ) )
{
int clearance = std::max( zone_clearance, item_clearance );
track->TransformShapeWithClearanceToPolygon( aFeatures,
clearance,
segsPerCircle,
correctionFactor );
}
}
/* Add module edge items that are on copper layers
* Pcbnew allows these items to be on copper layers in microwave applictions
* This is a bad thing, but must be handled here, until a better way is found
*/
for( MODULE* module = aPcb->m_Modules; module; module = module->Next() )
{
for( BOARD_ITEM* item = module->GraphicalItemsList(); item; item = item->Next() )
{
if( !item->IsOnLayer( GetLayer() ) && !item->IsOnLayer( Edge_Cuts ) )
continue;
if( item->Type() != PCB_MODULE_EDGE_T )
continue;
item_boundingbox = item->GetBoundingBox();
if( item_boundingbox.Intersects( zone_boundingbox ) )
{
int zclearance = zone_clearance;
if( item->IsOnLayer( Edge_Cuts ) )
// use only the m_ZoneClearance, not the clearance using
// the netclass value, because we do not have a copper item
zclearance = zone_to_edgecut_clearance;
( (EDGE_MODULE*) item )->TransformShapeWithClearanceToPolygon(
aFeatures, zclearance, segsPerCircle, correctionFactor );
}
}
}
// Add graphic items (copper texts) and board edges
// Currently copper texts have no net, so only the zone_clearance
// is used.
for( auto item : aPcb->Drawings() )
{
if( item->GetLayer() != GetLayer() && item->GetLayer() != Edge_Cuts )
continue;
int zclearance = zone_clearance;
if( item->GetLayer() == Edge_Cuts )
// use only the m_ZoneClearance, not the clearance using
// the netclass value, because we do not have a copper item
zclearance = zone_to_edgecut_clearance;
switch( item->Type() )
{
case PCB_LINE_T:
( (DRAWSEGMENT*) item )->TransformShapeWithClearanceToPolygon(
aFeatures,
zclearance, segsPerCircle, correctionFactor );
break;
case PCB_TEXT_T:
( (TEXTE_PCB*) item )->TransformBoundingBoxWithClearanceToPolygon(
aFeatures, zclearance );
break;
default:
break;
}
}
// Add zones outlines having an higher priority and keepout
for( int ii = 0; ii < GetBoard()->GetAreaCount(); ii++ )
{
ZONE_CONTAINER* zone = GetBoard()->GetArea( ii );
// If the zones share no common layers
if( !CommonLayerExists( zone->GetLayerSet() ) )
continue;
if( !zone->GetIsKeepout() && zone->GetPriority() <= GetPriority() )
continue;
if( zone->GetIsKeepout() && ! zone->GetDoNotAllowCopperPour() )
continue;
// A highter priority zone or keepout area is found: remove this area
item_boundingbox = zone->GetBoundingBox();
if( !item_boundingbox.Intersects( zone_boundingbox ) )
continue;
// Add the zone outline area.
// However if the zone has the same net as the current zone,
// do not add any clearance.
// the zone will be connected to the current zone, but filled areas
// will use different parameters (clearance, thermal shapes )
bool same_net = GetNetCode() == zone->GetNetCode();
bool use_net_clearance = true;
int min_clearance = zone_clearance;
// Do not forget to make room to draw the thick outlines
// of the hole created by the area of the zone to remove
int holeclearance = zone->GetClearance() + outline_half_thickness;
// The final clearance is obviously the max value of each zone clearance
min_clearance = std::max( min_clearance, holeclearance );
if( zone->GetIsKeepout() || same_net )
{
// Just take in account the fact the outline has a thickness, so
// the actual area to substract is inflated to take in account this fact
min_clearance = outline_half_thickness;
use_net_clearance = false;
}
zone->TransformOutlinesShapeWithClearanceToPolygon(
aFeatures, min_clearance, use_net_clearance );
}
// Remove thermal symbols
for( MODULE* module = aPcb->m_Modules; module; module = module->Next() )
{
for( D_PAD* pad = module->PadsList(); pad != NULL; pad = pad->Next() )
{
// Rejects non-standard pads with tht-only thermal reliefs
if( GetPadConnection( pad ) == PAD_ZONE_CONN_THT_THERMAL
&& pad->GetAttribute() != PAD_ATTRIB_STANDARD )
continue;
if( GetPadConnection( pad ) != PAD_ZONE_CONN_THERMAL
&& GetPadConnection( pad ) != PAD_ZONE_CONN_THT_THERMAL )
continue;
if( !pad->IsOnLayer( GetLayer() ) )
continue;
if( pad->GetNetCode() != GetNetCode() )
continue;
item_boundingbox = pad->GetBoundingBox();
int thermalGap = GetThermalReliefGap( pad );
item_boundingbox.Inflate( thermalGap, thermalGap );
if( item_boundingbox.Intersects( zone_boundingbox ) )
{
CreateThermalReliefPadPolygon( aFeatures,
*pad, thermalGap,
GetThermalReliefCopperBridge( pad ),
m_ZoneMinThickness,
segsPerCircle,
correctionFactor, s_thermalRot );
}
}
}
}
/**
* 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_CONTAINER::ComputeRawFilledAreas( BOARD* aPcb )
{
int segsPerCircle;
double correctionFactor;
int outline_half_thickness = m_ZoneMinThickness / 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( 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(s_DumpZonesWhenFilling)
dumper->BeginGroup("clipper-zone");
SHAPE_POLY_SET solidAreas = *m_smoothedPoly;
solidAreas.Inflate( -outline_half_thickness, segsPerCircle );
solidAreas.Simplify( POLY_CALC_MODE );
SHAPE_POLY_SET holes;
if(s_DumpZonesWhenFilling)
dumper->Write( &solidAreas, "solid-areas" );
tmp.RemoveAllContours();
buildFeatureHoleList( aPcb, holes );
if(s_DumpZonesWhenFilling)
dumper->Write( &holes, "feature-holes" );
holes.Simplify( POLY_CALC_MODE );
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( POLY_CALC_MODE );
if (s_DumpZonesWhenFilling)
dumper->Write( &areas_fractured, "areas_fractured" );
m_FilledPolysList = 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( 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. 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( POLY_CALC_MODE );
if( s_DumpZonesWhenFilling )
dumper->Write ( &th_fractured, "th_fractured" );
m_FilledPolysList = th_fractured;
}
m_RawPolysList = m_FilledPolysList;
if(s_DumpZonesWhenFilling)
dumper->EndGroup();
}
void ZONE_CONTAINER::RemoveInsulatedCopperIslands( BOARD* aPcb )
{
std::vector<int> islands;
auto connectivity = aPcb->GetConnectivity();
connectivity->FindIsolatedCopperIslands( this, islands );
std::sort( islands.begin(), islands.end(), std::greater<int>() );
for( auto idx : islands )
{
m_FilledPolysList.DeletePolygon( idx );
}
connectivity->Update( this );
}
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