274 lines
10 KiB
C++
274 lines
10 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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/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2012 Jean-Pierre Charras, jean-pierre.charras@ujf-grenoble.fr
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* Copyright (C) 1992-2012 KiCad Developers, see AUTHORS.txt for contributors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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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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/* Build the filled solid areas data from real outlines (stored in m_Poly)
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* The solid areas can be more than one on copper layers, and do not have holes
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( holes are linked by overlapping segments to the main outline)
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* aPcb: the current board (can be NULL for non copper zones)
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* aCornerBuffer: A reference to a buffer to store polygon corners, or NULL
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* if NULL:
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* - m_FilledPolysList is used to store solid areas polygons.
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* - on copper layers, tracks and other items shapes of other nets are
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* removed from solid areas
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* if not null:
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* Only the zone outline (with holes, if any) are stored in aCornerBuffer
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* with holes linked. Therfore only one polygon is created
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* This function calls AddClearanceAreasPolygonsToPolysList()
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* to add holes for pads and tracks and other items not in net.
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*/
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bool ZONE_CONTAINER::BuildFilledSolidAreasPolygons( BOARD* aPcb,
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CPOLYGONS_LIST* aCornerBuffer )
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{
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if( aCornerBuffer == NULL )
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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. polygon calculations do 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( m_smoothedPoly )
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{
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delete m_smoothedPoly;
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m_smoothedPoly = NULL;
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}
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switch( m_cornerSmoothingType )
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{
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case ZONE_SETTINGS::SMOOTHING_CHAMFER:
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m_smoothedPoly = m_Poly->Chamfer( m_cornerRadius );
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break;
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case ZONE_SETTINGS::SMOOTHING_FILLET:
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m_smoothedPoly = m_Poly->Fillet( m_cornerRadius, m_ArcToSegmentsCount );
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break;
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default:
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m_smoothedPoly = new CPolyLine;
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m_smoothedPoly->Copy( m_Poly );
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break;
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}
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if( aCornerBuffer )
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ConvertPolysListWithHolesToOnePolygon( m_smoothedPoly->m_CornersList,
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*aCornerBuffer );
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else
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ConvertPolysListWithHolesToOnePolygon( m_smoothedPoly->m_CornersList,
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m_FilledPolysList );
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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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* for non copper layers just recalculate the m_FilledPolysList
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* with m_ZoneMinThickness taken in account
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*/
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if( ! aCornerBuffer )
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{
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if( IsOnCopperLayer() )
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AddClearanceAreasPolygonsToPolysList( aPcb );
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else
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{
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// This KI_POLYGON_SET is the area(s) to fill, with m_ZoneMinThickness/2
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KI_POLYGON_SET polyset_zone_solid_areas;
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int margin = m_ZoneMinThickness / 2;
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/* First, creates the main polygon (i.e. the filled area using only one outline)
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* to reserve a m_ZoneMinThickness/2 margin around the outlines and holes
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* this margin is the room to redraw outlines with segments having a width set to
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* m_ZoneMinThickness
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* so m_ZoneMinThickness is the min thickness of the filled zones areas
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* the polygon is stored in polyset_zone_solid_areas
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*/
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CopyPolygonsFromFilledPolysListToKiPolygonList( polyset_zone_solid_areas );
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polyset_zone_solid_areas -= margin;
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// put solid area in m_FilledPolysList:
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m_FilledPolysList.clear();
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CopyPolygonsFromKiPolygonListToFilledPolysList( polyset_zone_solid_areas );
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}
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if ( m_FillMode ) // if fill mode uses segments, create them:
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FillZoneAreasWithSegments( );
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}
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return 1;
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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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int ZONE_CONTAINER::FillZoneAreasWithSegments()
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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 of 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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int minwidth = Mils2iu( 2 );
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margin = std::max ( minwidth, margin );
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int step = m_ZoneMinThickness - margin;
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step = std::max( step, minwidth );
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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].m_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
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// infinite line this is more easier if we move the X,Y axis origin to
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// 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
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// y = newrefy and the segment from (0,0) to (seg_endX,seg_endY) with the
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// horizontal line at the new refy position the line slope is:
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// 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:
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// intersec_x = refy/slope = refy * inv_slope
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// Note: because horizontal segments are already tested and skipped, slope
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// 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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