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add a tgPolygon::Diff for diff againt another polygon

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(unused for now, but was used in experiments)
This commit is contained in:
Peter Sadrozinski 2012-11-14 20:25:34 -05:00 • committed by Christian Schmitt
parent d2bc41428c
commit 9df1e2a81b
2 changed files with 18 additions and 0 deletions
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17
src/Lib/Polygon/polygon.cxx
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@ -2041,6 +2041,23 @@ tgPolygon tgPolygon::Union( const tgPolygon& subject, tgPolygon& clip )
return tgPolygon::FromClipper( clipper_result );
}
tgPolygon tgPolygon::Diff( const tgPolygon& subject, tgPolygon& clip )
{
tgPolygon result;
ClipperLib::Polygons clipper_subject = tgPolygon::ToClipper( subject );
ClipperLib::Polygons clipper_clip = tgPolygon::ToClipper( clip );
ClipperLib::Polygons clipper_result;
ClipperLib::Clipper c;
c.Clear();
c.AddPolygons(clipper_subject, ClipperLib::ptSubject);
c.AddPolygons(clipper_clip, ClipperLib::ptClip);
c.Execute(ClipperLib::ctDifference, clipper_result, ClipperLib::pftEvenOdd, ClipperLib::pftEvenOdd);
return tgPolygon::FromClipper( clipper_result );
}
tgPolygon tgPolygon::Intersect( const tgPolygon& subject, const tgPolygon& clip )
{
tgPolygon result;

1
src/Lib/Polygon/polygon.hxx
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@ -590,6 +590,7 @@ public:
// init_accumulator should return a handle...
static tgPolygon Union( const tgContour& subject, tgPolygon& clip );
static tgPolygon Union( const tgPolygon& subject, tgPolygon& clip );
static tgPolygon Diff( const tgPolygon& subject, tgPolygon& clip );
static tgPolygon Intersect( const tgPolygon& subject, const tgPolygon& clip );
static tgPolygon DiffWithAccumulator( const tgPolygon& subject );