public static List <GeneralPolygon2d> ComputeOffsetPolygon(GeneralPolygon2d poly, double fOffset, bool bMiter = false)
{
double nIntScale = GetIntScale(poly);
CPolygonList clipper_polys = new CPolygonList();
clipper_polys.Add(ClipperUtil.ConvertToClipper(poly.Outer, nIntScale));
foreach (Polygon2d hole in poly.Holes)
{
clipper_polys.Add(ClipperUtil.ConvertToClipper(hole, nIntScale));
}
CPolygonList dilate_solution = new CPolygonList();
try {
ClipperOffset co = new ClipperOffset();
if (bMiter)
{
co.AddPaths(clipper_polys, JoinType.jtMiter, EndType.etClosedPolygon);
}
else
{
co.AddPaths(clipper_polys, JoinType.jtRound, EndType.etClosedPolygon);
}
co.Execute(ref dilate_solution, fOffset * nIntScale);
} catch /*( Exception e )*/ {
//System.Diagnostics.Debug.WriteLine("ClipperUtil.ComputeOffsetPolygon: Clipper threw exception: " + e.Message);
return(new List <GeneralPolygon2d>());
}
List <GeneralPolygon2d> polys = ClipperUtil.ConvertFromClipper(dilate_solution, nIntScale);
return(polys);
}
public static List <GeneralPolygon2d> ComputeOffsetPolygon(Polygon2d poly, double fOffset, bool bSharp = false)
{
double nIntScale = GetIntScale(poly.Vertices);
List <IntPoint> clipper_poly = ClipperUtil.ConvertToClipper(poly, nIntScale);
CPolygonList clipper_polys = new CPolygonList()
{
clipper_poly
};
CPolygonList dilate_solution = new CPolygonList();
try {
ClipperOffset co = new ClipperOffset();
if (bSharp)
{
co.AddPaths(clipper_polys, JoinType.jtMiter, EndType.etClosedPolygon);
}
else
{
co.AddPaths(clipper_polys, JoinType.jtRound, EndType.etClosedPolygon);
}
co.Execute(ref dilate_solution, fOffset * nIntScale);
} catch /*( Exception e )*/ {
//System.Diagnostics.Debug.WriteLine("ClipperUtil.ComputeOffsetPolygon: Clipper threw exception: " + e.Message);
return(new List <GeneralPolygon2d>());
}
if (dilate_solution.Count == 0)
{
return(new List <GeneralPolygon2d>());
}
List <GeneralPolygon2d> polys = ClipperUtil.ConvertFromClipper(dilate_solution, nIntScale);
return(polys);
}