public void Join(ContourPolygon pol)
{
var size = NumberOfContours;
Contours.AddRange(pol.Contours);
foreach (var contour in pol.Contours)
{
contour.ClearHoles();
foreach (var holeId in contour.Holes)
{
Contours.Last().AddHole(holeId + size);
}
}
}
/// <summary>
/// Given a polygon 2D with holes where none of the holes are overlapping, will create a contour polygon
/// from it conforming to the requirements of the ContourPolygon.
/// </summary>
/// <param name="pol"></param>
/// <returns></returns>
public static ContourPolygon ToContourPolygon(this Polygon2DWithHoles pol)
{
var outside = new Contour((pol.IsClockwise()
? pol.Vertices.Reverse()
: pol.Vertices).Select(v => new Vector2D(v)),
Enumerable.Range(1,
pol.Holes.Count)); // The Polygon2D can be in cw order, while we need it in ccw order
var result = new ContourPolygon();
result.Add(outside);
foreach (var hole in pol.Holes)
{
result.Add(new Contour((pol.IsClockwise()
? pol.Vertices
: pol.Vertices.Reverse()).Select(v => new Vector2D(v)), Enumerable.Range(1, pol.Holes.Count),
false)); // The Polygon2D can be in ccw order, while we need it in cc order for holes;
}
return(result);
}