inline void clipEdge( bool closePolygon, PointBuffer<Point> &points, PointBuffer<Point> &clippedPoints ) const { clippedPoints.reset(); if ( points.size() < 2 ) { if ( points.size() == 1 ) clippedPoints.add( points[0] ); return; } const Edge edge( d_clipRect.x(), d_clipRect.x() + d_clipRect.width(), d_clipRect.y(), d_clipRect.y() + d_clipRect.height() ); int lastPos, start; if ( closePolygon ) { start = 0; lastPos = points.size() - 1; } else { start = 1; lastPos = 0; if ( edge.isInside( points[0] ) ) clippedPoints.add( points[0] ); } const uint nPoints = points.size(); for ( uint i = start; i < nPoints; i++ ) { const Point &p1 = points[i]; const Point &p2 = points[lastPos]; if ( edge.isInside( p1 ) ) { if ( edge.isInside( p2 ) ) { clippedPoints.add( p1 ); } else { clippedPoints.add( edge.intersection( p1, p2 ) ); clippedPoints.add( p1 ); } } else { if ( edge.isInside( p2 ) ) { clippedPoints.add( edge.intersection( p1, p2 ) ); } } lastPos = i; } }