public static GeometryGraphicsPath FromRegions(GeometryRegion lhs, CombineMode combineMode, GeometryRegion rhs)
{
Rectangle lhsBounds = lhs.GetBoundsInt();
Rectangle rhsBounds = rhs.GetBoundsInt();
int left = Math.Min(lhsBounds.Left, rhsBounds.Left);
int top = Math.Min(lhsBounds.Top, rhsBounds.Top);
int right = Math.Max(lhsBounds.Right, rhsBounds.Right);
int bottom = Math.Max(lhsBounds.Bottom, rhsBounds.Bottom);
Rectangle bounds = Rectangle.FromLTRB(left, top, right, bottom);
BitVector2D stencil = new BitVector2D(bounds.Width, bounds.Height);
Rectangle[] lhsScans = lhs.GetRegionScansReadOnlyInt();
Rectangle[] rhsScans = rhs.GetRegionScansReadOnlyInt();
switch (combineMode)
{
case CombineMode.Complement:
case CombineMode.Intersect:
case CombineMode.Replace:
throw new ArgumentException("combineMode can't be Complement, Intersect, or Replace");
}
for (int i = 0; i < lhsScans.Length; ++i)
{
Rectangle rect = lhsScans[i];
rect.X -= bounds.X;
rect.Y -= bounds.Y;
stencil.UnsafeSet(rect, true);
}
for (int i = 0; i < rhsScans.Length; ++i)
{
Rectangle rect = rhsScans[i];
rect.X -= bounds.X;
rect.Y -= bounds.Y;
switch (combineMode)
{
case CombineMode.Xor:
stencil.UnsafeInvert(rect);
break;
case CombineMode.Union:
stencil.UnsafeSet(rect, true);
break;
case CombineMode.Exclude:
stencil.UnsafeSet(rect, false);
break;
}
}
GeometryGraphicsPath path = PathFromStencil(stencil, new Rectangle(0, 0, stencil.Width, stencil.Height));
using (var matrix = new Matrix())
{
matrix.Reset();
matrix.Translate(bounds.X, bounds.Y);
path.Transform(matrix);
}
return(path);
}
