SGDE.Physics.Collision.CollisionUnit.CollidesWith C# (CSharp) Method

        public bool CollidesWith(CollisionUnit other)
        {
            Vector2 otherCircleCenter;
            int otherCircleRadius;
            float dX;
            float dY;
            float dist;
            Vector2 otherUpperLeft;
            Vector2 otherLowerRight;

            mCheckedUnits.Add(other);

            if (mCollisionType == CollisionType.COLLISION_CIRCLE && other.GetCollisionType() == CollisionType.COLLISION_CIRCLE)
            {
                otherCircleCenter = other.GetCircleCenter();
                otherCircleRadius = other.GetCircleRadius();

                dX = mCircleCenter.X - otherCircleCenter.X;
                dY = mCircleCenter.Y - otherCircleCenter.Y;
                dist = (dX * dX) + (dY * dY);

                // (radius + radius)^2 instead of more expensive squareRoot(dist)
                return (dist <= (mCircleRadius + otherCircleRadius) * (mCircleRadius + otherCircleRadius));
            }
            else if (mCollisionType == CollisionType.COLLISION_CIRCLE && other.GetCollisionType() == CollisionType.COLLISION_BOX)
            {
                return CircleBoxCollision(mCircleCenter, mCircleRadius, other.GetUpperLeft(), other.GetLowerRight());
            }
            else if (mCollisionType == CollisionType.COLLISION_BOX && other.GetCollisionType() == CollisionType.COLLISION_CIRCLE)
            {
                return CircleBoxCollision(other.GetCircleCenter(), other.GetCircleRadius(), mPoint1, mPoint2);
            }
            else if (mCollisionType == CollisionType.COLLISION_BOX && other.GetCollisionType() == CollisionType.COLLISION_BOX)
            {
                otherUpperLeft = other.GetUpperLeft();
                otherLowerRight = other.GetLowerRight();

                return (mPoint1.X <= otherLowerRight.X && mPoint1.Y <= otherLowerRight.Y && otherUpperLeft.X <= mPoint2.X && otherUpperLeft.Y <= mPoint2.Y);
            }

            // TODO: other collision types - line, pixel

            return false;
        }