public static PolygonPath FromTree(PolygonTree tree, NodeType nodeType = NodeType.Any)
{
return(new PolygonPath(tree.Children.Count)
{
{ tree, nodeType }
});
}
public void Execute(ref PolygonTree solution, double delta)
{
solution.Clear();
FixOrientations();
DoOffset(delta);
//now clean up 'corners' ...
var clipper = new Clipper();
if (delta > 0)
{
clipper.Execute(
ClipOperation.Union,
_destinationPolygons,
null,
solution,
false,
PolygonFillType.Positive, PolygonFillType.Positive);
}
else
{
var r = Clipper.GetBounds(_destinationPolygons);
var outer = new Polygon
{
new IntPoint(r.Left - 10, r.Bottom + 10),
new IntPoint(r.Right + 10, r.Bottom + 10),
new IntPoint(r.Right + 10, r.Top - 10),
new IntPoint(r.Left - 10, r.Top - 10)
};
clipper.ReverseOrientation = true;
clipper.Execute(
ClipOperation.Union,
new PolygonPath(outer),
null,
solution,
false,
PolygonFillType.Negative,
PolygonFillType.Negative);
// remove the outer PolygonNode rectangle ...
if (solution.Children.Count == 1 && solution.Children[0].Children.Count > 0)
{
var outerNode = solution.Children[0];
solution.Children.Capacity = outerNode.Children.Count;
solution.Children[0] = outerNode.Children[0];
solution.Children[0].Parent = solution;
for (var i = 1; i < outerNode.Children.Count; i++)
{
solution.AddChild(outerNode.Children[i]);
}
}
else
{
solution.Clear();
}
}
}