239 lines
8.4 KiB
C++
239 lines
8.4 KiB
C++
/**
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* @file zone_filling_algorithm.cpp:
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* Algorithms used to fill a zone defined by a polygon and a filling starting point.
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*/
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#include <algorithm> // sort
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#include "fctsys.h"
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#include "trigo.h"
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#include "wxPcbStruct.h"
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#include "class_zone.h"
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#include "pcbnew.h"
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#include "zones.h"
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#include "protos.h"
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/* Local functions */
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/* Local variables */
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/**
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* Function BuildFilledPolysListData
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* Build m_FilledPolysList data from real outlines (m_Poly)
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* in order to have drawable (and plottable) filled polygons
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* drawable filled polygons are polygons without hole
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* @param aPcb: the current board (can be NULL for non copper zones)
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* @return number of polygons
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* This function does not add holes for pads and tracks but calls
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* AddClearanceAreasPolygonsToPolysList() to do that for copper layers
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*/
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int ZONE_CONTAINER::BuildFilledPolysListData( BOARD* aPcb )
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{
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m_FilledPolysList.clear();
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/* convert outlines + holes to outlines without holes (adding extra segments if necessary)
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* m_Poly data is expected normalized, i.e. NormalizeAreaOutlines was used after building
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* this zone
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*/
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if( GetNumCorners() <= 2 ) // malformed zone. Kbool does not like it ...
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return 0;
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// Make a smoothed polygon out of the user-drawn polygon if required
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if( smoothedPoly ) {
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delete smoothedPoly;
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smoothedPoly = NULL;
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}
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switch( cornerSmoothingType )
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{
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case ZONE_SETTING::SMOOTHING_CHAMFER:
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smoothedPoly = m_Poly->Chamfer( cornerRadius );
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break;
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case ZONE_SETTING::SMOOTHING_FILLET:
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smoothedPoly = m_Poly->Fillet( cornerRadius, m_ArcToSegmentsCount );
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break;
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default:
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smoothedPoly = new CPolyLine;
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smoothedPoly->Copy( m_Poly );
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break;
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}
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smoothedPoly->MakeKboolPoly( -1, -1, NULL, true );
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int count = 0;
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while( smoothedPoly->GetKboolEngine()->StartPolygonGet() )
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{
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CPolyPt corner( 0, 0, false );
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while( smoothedPoly->GetKboolEngine()->PolygonHasMorePoints() )
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{
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corner.x = (int) smoothedPoly->GetKboolEngine()->GetPolygonXPoint();
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corner.y = (int) smoothedPoly->GetKboolEngine()->GetPolygonYPoint();
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corner.end_contour = false;
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m_FilledPolysList.push_back( corner );
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count++;
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}
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corner.end_contour = true;
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m_FilledPolysList.pop_back();
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m_FilledPolysList.push_back( corner );
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smoothedPoly->GetKboolEngine()->EndPolygonGet();
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}
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smoothedPoly->FreeKboolEngine();
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/* For copper layers, we now must add holes in the Polygon list.
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* holes are pads and tracks with their clearance area
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*/
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if( IsOnCopperLayer() )
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AddClearanceAreasPolygonsToPolysList( aPcb );
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if ( m_FillMode ) // if fill mode uses segments, create them:
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Fill_Zone_Areas_With_Segments( );
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return count;
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}
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// Sort function to build filled zones
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static bool SortByXValues( const int& a, const int &b)
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{
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return a < b;
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}
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/**
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* Function Fill_Zone_Areas_With_Segments
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* Fill sub areas in a zone with segments with m_ZoneMinThickness width
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* A scan is made line per line, on the whole filled areas, with a step of m_ZoneMinThickness.
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* all intersecting points with the horizontal infinite line and polygons to fill are calculated
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* a list of SEGZONE items is built, line per line
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* @return number of segments created
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*/
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int ZONE_CONTAINER::Fill_Zone_Areas_With_Segments()
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{
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int ics, ice;
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int count = 0;
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std::vector <int> x_coordinates;
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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;
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margin = max (2, margin);
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int step = m_ZoneMinThickness - margin;
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step = max(step, 2);
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// Read all filled areas in m_FilledPolysList
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m_FillSegmList.clear();
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istart = 0;
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int end_list = m_FilledPolysList.size()-1;
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for( int ic = 0; ic <= end_list; ic++ )
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{
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CPolyPt* corner = &m_FilledPolysList[ic];
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if ( corner->end_contour || (ic == end_list) )
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{
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iend = ic;
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EDA_RECT rect = CalculateSubAreaBoundaryBox( istart, iend );
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// Calculate the y limits of the zone
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int refy = rect.GetY();
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int endy = rect.GetBottom();
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for( ; refy < endy; refy += step )
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{
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// find all intersection points of an infinite line with polyline sides
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x_coordinates.clear();
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for( ics = istart, ice = iend; ics <= iend; ice = ics, ics++ )
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{
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if ( m_FilledPolysList[ice].utility )
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continue;
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int seg_startX = m_FilledPolysList[ics].x;
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int seg_startY = m_FilledPolysList[ics].y;
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int seg_endX = m_FilledPolysList[ice].x;
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int seg_endY = m_FilledPolysList[ice].y;
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/* Trivial cases: skip if ref above or below the segment to test */
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if( ( seg_startY > refy ) && (seg_endY > refy ) )
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continue;
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// segment below ref point, or its Y end pos on Y coordinate ref point: skip
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if( ( seg_startY <= refy ) && (seg_endY <= refy ) )
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continue;
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/* at this point refy is between seg_startY and seg_endY
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* see if an horizontal line at Y = refy is intersecting this segment
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*/
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// calculate the x position of the intersection of this segment and the infinite line
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// this is more easier if we move the X,Y axis origin to the segment start point:
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seg_endX -= seg_startX;
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seg_endY -= seg_startY;
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double newrefy = (double) (refy - seg_startY);
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double intersec_x;
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if ( seg_endY == 0 ) // horizontal segment on the same line: skip
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continue;
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// Now calculate the x intersection coordinate of the horizontal line at y = newrefy
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// and the segment from (0,0) to (seg_endX,seg_endY)
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// with the horizontal line at the new refy position
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// the line slope is slope = seg_endY/seg_endX; and inv_slope = seg_endX/seg_endY
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// and the x pos relative to the new origin is intersec_x = refy/slope = refy * inv_slope
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// Note: because horizontal segments are already tested and skipped, slope exists (seg_end_y not O)
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double inv_slope = (double)seg_endX / seg_endY;
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intersec_x = newrefy * inv_slope;
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x_coordinates.push_back((int) intersec_x + seg_startX);
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}
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// A line scan is finished: build list of segments
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// Sort intersection points by increasing x value:
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// So 2 consecutive points are the ends of a segment
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sort( x_coordinates.begin(), x_coordinates.end(), SortByXValues );
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// Create segments
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if ( !error && ( x_coordinates.size() & 1 ) != 0 )
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{ // An even number of coordinates is expected, because a segment has 2 ends.
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// An if this algorithm always works, it must always find an even count.
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wxString msg = wxT("Fill Zone: odd number of points at y = ");
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msg << refy;
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wxMessageBox(msg );
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error = true;
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}
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if ( error )
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break;
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int iimax = x_coordinates.size()-1;
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for (int ii = 0; ii < iimax; ii +=2 )
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{
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wxPoint seg_start, seg_end;
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count++;
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seg_start.x = x_coordinates[ii];
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seg_start.y = refy;
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seg_end.x = x_coordinates[ii+1];
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seg_end.y = refy;
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SEGMENT segment( seg_start, seg_end );
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m_FillSegmList.push_back( segment );
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}
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} //End examine segments in one area
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if ( error )
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break;
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istart = iend + 1; // istart points the first corner of the next area
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} // End find one end of outline
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if ( error )
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break;
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} // End examine all areas
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return count;
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}
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