kicad/pcbnew/zone_filling_algorithm.cpp

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/* filling_zone_algorithm:
* Algos used to fill a zone defined by a polygon and a filling starting point
*/
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#include <algorithm> // sort
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#include "fctsys.h"
#include "common.h"
#include "pcbnew.h"
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#include "wxPcbStruct.h"
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#include "zones.h"
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#include "trigo.h"
#include "protos.h"
/* Local functions */
/* Local variables */
/***********************************************************/
int ZONE_CONTAINER::BuildFilledPolysListData( BOARD* aPcb )
/***********************************************************/
/**
* Function BuildFilledPolysListData
* Build m_FilledPolysList data from real outlines (m_Poly)
* in order to have drawable (and plottable) filled polygons
* drawable filled polygons are polygons without hole
* @param aPcb: the current board (can be NULL for non copper zones)
* @return number of polygons
* This function does not add holes for pads and tracks but calls
* AddClearanceAreasPolygonsToPolysList() to do that for copper layers
*/
{
m_FilledPolysList.clear();
/* 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. Kbool does not like it ...
return 0;
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// Make a smoothed polygon out of the user-drawn polygon if required
if( smoothedPoly ) {
delete smoothedPoly;
smoothedPoly = NULL;
}
switch( cornerSmoothingType )
{
case ZONE_SETTING::SMOOTHING_CHAMFER:
smoothedPoly = m_Poly->Chamfer( cornerRadius );
break;
case ZONE_SETTING::SMOOTHING_FILLET:
smoothedPoly = m_Poly->Fillet( cornerRadius, m_ArcToSegmentsCount );
break;
default:
smoothedPoly = new CPolyLine;
smoothedPoly->Copy( m_Poly );
break;
}
smoothedPoly->MakeKboolPoly( -1, -1, NULL, true );
int count = 0;
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while( smoothedPoly->GetKboolEngine()->StartPolygonGet() )
{
CPolyPt corner( 0, 0, false );
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while( smoothedPoly->GetKboolEngine()->PolygonHasMorePoints() )
{
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corner.x = (int) smoothedPoly->GetKboolEngine()->GetPolygonXPoint();
corner.y = (int) smoothedPoly->GetKboolEngine()->GetPolygonYPoint();
corner.end_contour = false;
m_FilledPolysList.push_back( corner );
count++;
}
corner.end_contour = true;
m_FilledPolysList.pop_back();
m_FilledPolysList.push_back( corner );
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smoothedPoly->GetKboolEngine()->EndPolygonGet();
}
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smoothedPoly->FreeKboolEngine();
/* For copper layers, we now must add holes in the Polygon list.
* holes are pads and tracks with their clearance area
*/
if( IsOnCopperLayer() )
AddClearanceAreasPolygonsToPolysList( aPcb );
if ( m_FillMode ) // if fill mode uses segments, create them:
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Fill_Zone_Areas_With_Segments( );
return count;
}
// Sort function to build filled zones
static bool SortByXValues( const int& a, const int &b)
{
return a < b;
}
/**
* Function Fill_Zone_Areas_With_Segments
* Fill sub areas in a zone with segments with m_ZoneMinThickness width
* A scan is made line per line, on the whole filled areas, with a step of m_ZoneMinThickness.
* all intersecting points with the horizontal infinite line and polygons to fill are calculated
* a list of SEGZONE items is built, line per line
* @return number of segments created
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*/
int ZONE_CONTAINER::Fill_Zone_Areas_With_Segments()
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{
int ics, ice;
int count = 0;
std::vector <int> x_coordinates;
bool error = false;
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int istart, iend; // index od the starting and the endif corner of one filled area in m_FilledPolysList
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int margin = m_ZoneMinThickness * 2 / 10;
margin = max (2, margin);
int step = m_ZoneMinThickness - margin;
step = max(step, 2);
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// Read all filled areas in m_FilledPolysList
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m_FillSegmList.clear();
istart = 0;
int end_list = m_FilledPolysList.size()-1;
for( int ic = 0; ic <= end_list; ic++ )
{
CPolyPt* corner = &m_FilledPolysList[ic];
if ( corner->end_contour || (ic == end_list) )
{
iend = ic;
EDA_Rect rect = CalculateSubAreaBoundaryBox( istart, iend );
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// Calculate the y limits of the zone
int refy = rect.GetY();
int endy = rect.GetBottom();
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for( ; refy < endy; refy += step )
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{
// find all intersection points of an infinite line with polyline sides
x_coordinates.clear();
for( ics = istart, ice = iend; ics <= iend; ice = ics, ics++ )
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{
if ( m_FilledPolysList[ice].utility )
continue;
int seg_startX = m_FilledPolysList[ics].x;
int seg_startY = m_FilledPolysList[ics].y;
int seg_endX = m_FilledPolysList[ice].x;
int seg_endY = m_FilledPolysList[ice].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
sort( x_coordinates.begin(), x_coordinates.end(), SortByXValues );
// Create segments
if ( !error && ( x_coordinates.size() & 1 ) != 0 )
{ // 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.
wxString msg = wxT("Fill Zone: odd number of points at y = ");
msg << refy;
wxMessageBox(msg );
error = true;
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}
if ( error ) break;
int iimax = x_coordinates.size()-1;
for (int ii = 0; ii < iimax; ii +=2 )
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{
wxPoint seg_start, seg_end;
count++;
seg_start.x = x_coordinates[ii];
seg_start.y = refy;
seg_end.x = x_coordinates[ii+1];
seg_end.y = refy;
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SEGMENT segment( seg_start, seg_end );
m_FillSegmList.push_back( segment );
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}
} //End examine segments in one area
if ( error ) break;
istart = iend + 1; // istart points the first corner of the next area
} // End find one end of outline
if ( error ) break;
} // End examine all areas
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return count;
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}