public Polygon2Ex ToBorderExtendingPolygon(float distance)
{
List <Vector2> polygon_vertices = new List <Vector2> ();
for (int i = 0; i < this.VertexCount; i++)
{
Vector2 prev_v = this.Vertices [(i - 1 + this.VertexCount) % this.VertexCount];
Vector2 this_v = this.Vertices [i];
Vector2 next_v = this.Vertices [(i + 1) % this.VertexCount];
Line2Ex line0 = new Line2Ex(Line2.CreateFromTwoPoints(prev_v, this_v));
Line2Ex line1 = new Line2Ex(Line2.CreateFromTwoPoints(this_v, next_v));
Line2Ex p_line0 = line0.ToParallel(distance);
Line2Ex p_line1 = line1.ToParallel(distance);
Line2Line2Intr info;
if (Intersection.FindLine2Line2(ref p_line0.baseLine, ref p_line1.baseLine, out info))
{
polygon_vertices.Add(info.Point);
}
else
{
polygon_vertices.Add(this_v);
}
}
return(new Polygon2Ex(polygon_vertices.ToArray()));
}
