public static void PolyTreeToPolygons(PolyTree polytree, List<List<IntPoint>> polygons)
{
Contract.Requires(polytree != null);
Contract.Requires(polygons != null);
polygons.Clear();
InternalHelpers.AddPolyNodeToPolygons(polytree, polygons);
}
public bool Execute(ClipType clipType, PolyTree polytree, PolyFillType subjFillType = PolyFillType.EvenOdd, PolyFillType clipFillType = PolyFillType.EvenOdd)
{
if (_executeLocked)
return false;
_executeLocked = true;
_subjFillType = subjFillType;
_clipFillType = clipFillType;
_clipType = clipType;
_usingPolyTree = true;
var succeeded = ExecuteInternal();
//build the return polygons ...
if (succeeded)
BuildResultPolytree(polytree);
_executeLocked = false;
return succeeded;
}
private void BuildResultPolytree(PolyTree polytree)
{
Contract.Requires(polytree != null);
polytree.Clear();
//add each output polygon/contour to polytree ...
foreach (var outRec in _polyOuts)
{
var cnt = PointCount(outRec.Pts);
if (cnt < 3)
continue;
FixHoleLinkage(outRec);
var pn = new PolyNode();
polytree.AllPolys.Add(pn);
outRec.PolyNode = pn;
var op = outRec.Pts;
for (var j = 0; j < cnt; j++)
{
pn.Polygon.Add(op.Pt);
op = op.Prev;
}
}
//fixup PolyNode links etc ...
foreach (var outRec in _polyOuts.Where(outRec => outRec.PolyNode != null))
{
if (outRec.FirstLeft == null)
polytree.AddChild(outRec.PolyNode);
else
outRec.FirstLeft.PolyNode.AddChild(outRec.PolyNode);
}
}