/****************************
*** Directional Detection ***
****************************/
// Identifies the direction of a collision.
// WARNING: Heavy use. Only run this AFTER you've tested for if the objects overlap.
public static DirCardinal GetDirectionOfCollision(GameObject obj, GameObject obj2)
{
// If the movement between the objects > the amount overlapped, ignore the overlap.
// This prevents problems like inaccurate hitboxes from the wrong side.
int maxOverlapY = CollideDetect.GetMaxOverlapY(obj.physics, obj2.physics);
int relativeY = CollideDetect.GetRelativeDY(obj.physics, obj2.physics);
int overlapY = CollideDetect.GetOverlapY(obj, obj2, relativeY <= 0);
if (Math.Abs(overlapY) <= maxOverlapY)
{
return(relativeY > 0 ? DirCardinal.Up : DirCardinal.Down);
}
// Same as above, but for X coordinates.
int maxOverlapX = CollideDetect.GetMaxOverlapX(obj.physics, obj2.physics);
int relativeX = CollideDetect.GetRelativeDX(obj.physics, obj2.physics);
int overlapX = CollideDetect.GetOverlapX(obj, obj2, relativeX <= 0);
if (Math.Abs(overlapX) <= maxOverlapX)
{
return(relativeX > 0 ? DirCardinal.Left : DirCardinal.Right);
}
// If we've made it this far, the object is overlapping, but already passed the edge.
// We return false to avoid unusual behavior, such as 'popping' up on a platform when you're slightly beneath it.
return(DirCardinal.None);
}
// TODO HIGH PRIORITY: Might not need this if we rebuild GetDirectionOfCollision, due to no longer needing floats, etc.
// Forces a direction to be assumed in a collision based on relative motion of the objects.
public static DirCardinal AssumeDirectionOfCollision(Physics obj1Phys, Physics obj2Phys)
{
int relativeY = CollideDetect.GetRelativeDY(obj1Phys, obj2Phys);
int relativeX = CollideDetect.GetRelativeDX(obj1Phys, obj2Phys);
// If the relative motion of Y is greater than the relative motion of X, return a vertical collision.
if (relativeY > relativeX)
{
return(relativeY > 0 ? DirCardinal.Up : DirCardinal.Down);
}
return(relativeX > 0 ? DirCardinal.Left : DirCardinal.Right);
}
