public static Shape ToShape(this PolygonGroup polygonGroup)
{
var shape = new Shape();
foreach (var polygon in polygonGroup.Children.Cast<Polygon>())
{
var polyPoints = polygon.Children.Cast<PolyPoint>().ToList();
var vertices = new List<Vector2>(polyPoints.Count);
vertices.AddRange(polyPoints.Select(point => ConvertUnits.ToSimUnits(new Vector2(point.X, point.Y))));
shape.Vertices.Add(vertices);
}
return shape;
}
private static Shape ScaleConvertAndPartition(StringBuilder spool, bool strict, Image image, IEnumerable<Vertices> polygons, TriangulationAlgorithm algorithm)
{
var scale = ConvertUnits.ToSimUnits(1, 1);
var width = ConvertUnits.ToSimUnits(image.Width);
var height = ConvertUnits.ToSimUnits(image.Height);
var translation = new Vector2(-width, -height)*0.5f;
var final = new List<List<Vector2>>();
foreach (var polygon in polygons)
{
polygon.Scale(scale);
polygon.Translate(translation);
var thisPolygon = SimplifyTools.CollinearSimplify(polygon);
if (strict)
{
var errors = thisPolygon.CheckPolygon();
if (errors != PolygonError.NoError)
{
spool.AppendFormat("Invalid shape ({0})", errors);
return null;
}
}
try
{
var partition = Triangulate.ConvexPartition(thisPolygon, algorithm);
var vertices = partition.Select(verts => verts.Select(v => new Vector2(v.X, v.Y)).ToList());
final.AddRange(vertices);
}
catch
{
spool.AppendFormat("Cannot triangulate polygon");
spool.AppendLine();
}
}
var shape = new Shape
{
Vertices = final
};
return shape;
}
