// This function calculate Circle to ABB collisions
public static CollisionInfo CircleToOBBCollision(CollisionHull2D a, CollisionHull2D b)
{
Vector2 closestPointToCircle = new Vector2(Math.Max(b.GetMinimumCorner().x, Math.Min(a.GetPosition().x, b.GetMaximumCorner().x)), Math.Max(b.GetMinimumCorner().y, Math.Min(a.GetPosition().y, b.GetMaximumCorner().y)));
Vector2 distance = a.GetPosition() - closestPointToCircle;
float distanceSquared = Vector2.Dot(distance, distance);
float penetration = a.GetDimensions().x - Mathf.Sqrt(distanceSquared);
// Does the check pass?
if (penetration > 0)
{
// If yes, then inform the parents of the complex shape object (if applicable)
ReportCollisionToParent(a, b);
}
else
{
// If no, return nothing
return(null);
}
// Return full details of the Collision list if the two collide
return(new CollisionInfo(a, b, penetration));
}
// This function calculates Circle to OBB collisions
public static CollisionInfo CircleToABBCollision(CollisionHull2D a, CollisionHull2D b)
{
// Find the closest point to the circle from the AABB
Vector2 closestPointToCircle = new Vector2(Math.Max(b.GetMinimumCorner().x, Math.Min(a.GetPosition().x, b.GetMaximumCorner().x)), Math.Max(b.GetMinimumCorner().y, Math.Min(a.GetPosition().y, b.GetMaximumCorner().y)));
// Get the distance between the closest point and the circle's position
Vector2 distance = a.GetPosition() - closestPointToCircle;
float distanceSquared = Vector2.Dot(distance, distance);
// Calculate the penetration
float penetration = a.GetDimensions().x - Mathf.Sqrt(distanceSquared);
// Is the penetration a positive value
if (penetration > 0)
{
// If yes, then inform the parents of the complex shape object (if applicable)
ReportCollisionToParent(a, b);
}
else
{
// If no, return nothing
return(null);
}
// Return full details of the Collision list if the two collide
return(new CollisionInfo(a, b, penetration));
}