An IShape2D is an interface that, when implemented, allows for spatial hashing and the computation of Minkowski Differences.
Your IShape2D implementations should be structs for memory efficiency purposes.
An axis-aligned bounding box for the shape. This is stored so we can efficiently transform the AABB when necessary.
A method which implements a support function for use with a Minkowski Difference.
The support function must, given a directional vector and a Transform2D, return the farthest possible vertex of the transformed shape in the given direction.
For example, the support function for Bonk’s Circle implementation:
public Vector2 Support(Vector2 direction, Transform2D transform)
{
return Vector2.Transform(Vector2.Normalize(direction) * Radius, transform.TransformMatrix);
}
A method which returns the axis-aligned bounding box for the transformed shape.
For example, the AABB method for Bonk’s Circle implementation:
public AABB TransformedAABB(Transform2D Transform2D)
{
return AABB.Transformed(AABB, transform2D);
}