/****************************
*** Directional Detection ***
****************************/
// Identifies the direction of a collision relative to a rectangle.
// WARNING: Heavy process. Only run this AFTER you've tested for if the rectangle overlaps.
public static DirCardinal GetDirectionOfCollision(GameObject obj, int x1, int x2, int y1, int y2)
{
// If the movement between the objects > the amount overlapped, ignore the overlap.
// This prevents problems like inaccurate hitboxes from the wrong side.
int maxOverlapY = Math.Abs(obj.physics.AmountMovedY);
int relativeY = 0 - obj.physics.AmountMovedY;
int overlapY = CollideRect.GetOverlapY(obj, y1, y2, relativeY <= 0);
if (overlapY <= maxOverlapY)
{
return(relativeY > 0 ? DirCardinal.Up : DirCardinal.Down);
}
// Same as above, but for X coordinates.
int maxOverlapX = Math.Abs(obj.physics.AmountMovedX);
int relativeX = 0 - obj.physics.AmountMovedX;
int overlapX = CollideRect.GetOverlapX(obj, x1, x2, relativeX <= 0);
if (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);
}
public virtual void BounceUp(int midX, sbyte strengthMod = 4, byte maxX = 2, sbyte relativeMult = 3)
{
this.physics.velocity.Y = FInt.Create(-strengthMod);
if (maxX > 0)
{
short xDiff = CollideRect.GetRelativeX(this, midX);
FInt xAdjust = FInt.Create(Math.Min(maxX, Math.Abs(xDiff / relativeMult)));
if (xDiff > 0)
{
this.physics.velocity.X += xAdjust;
}
else
{
this.physics.velocity.X -= xAdjust;
}
}
}