/// <summary>
/// Check the collision between the hitbox and a point.
/// </summary>
/// <param name="pt">Point.</param>
/// <param name="infinitePt">A point that can not be in the hitbox in any way.</param>
/// <returns>True if there is a collision, false otherwise.</returns>
public bool Collision(Vector2f pt, Vector2f infinitePt)
{
pt = InverseTransform.TransformPoint(pt);
bool finalHit = false;
foreach (var shape in Vertices)
{
bool currentHit = false;
List <Segment> list = new List <Segment>();
{
var tmp = shape.Item1.ToArray();
Vector2f old = tmp.First();
for (int i = 1; i <= tmp.Length; i++)
{
list.Add(new Segment(old, tmp[i % tmp.Length]));
old = tmp[i % tmp.Length];
}
}
int hit = 0;
foreach (var seg in list)
{
if (seg.Collision(new Segment(infinitePt, pt)))
{
hit++;
}
}
currentHit = hit % 2 == 1;
if (currentHit)
{
if (shape.Item2 == CombineMode.ADD)
{
finalHit = true;
}
else if (shape.Item2 == CombineMode.REMOVE)
{
finalHit = false;
}
else if (shape.Item2 == CombineMode.INTERSECT)
{
finalHit = !finalHit;
}
}
}
return(finalHit);
}
protected virtual Vector2f ToLocalCoordinates(Vector2f source)
{
return(InverseTransform.TransformPoint(source));
}