/// <summary>
/// Moves a collider in the direction provided until it hits something
/// </summary>
/// <param name="mover">Collider which is moving</param>
/// <param name="deltaPosition">Change in position the collider is trying to make</param>
public void handleMovement(Collider mover, Vector2 deltaPosition)
{
double areaOfMovementX1 = Math.Min(mover.Bounds.X, mover.Bounds.X + deltaPosition.X);
double areaOfMovementY1 = Math.Min(mover.Bounds.Y, mover.Bounds.Y + deltaPosition.Y);
double areaOfMovementX2 = Math.Max(mover.Bounds.X + mover.Bounds.Width, mover.Bounds.X + mover.Bounds.Width + deltaPosition.X);
double areaOfMovementY2 = Math.Max(mover.Bounds.Y + mover.Bounds.Height, mover.Bounds.Y + mover.Bounds.Height + deltaPosition.Y);
DoubleRect areaOfMovement = new DoubleRect(
areaOfMovementX1,
areaOfMovementY1,
areaOfMovementX2 - areaOfMovementX1,
areaOfMovementY2 - areaOfMovementY1);
//DoubleRect newbounds = mover.Bounds + deltaPosition;
List<Collider> collisions = m_tree.Query(areaOfMovement);
List<Collider>.Enumerator i = collisions.GetEnumerator();
Vector2 allowedMovement = deltaPosition;
Vector2 temp;
while (i.MoveNext())
{
// we will usually collide with our old position - ignore that case
if (i.Current != mover)
{
bool canMove = CollisionHandler.handleMovement(mover, i.Current, deltaPosition, out temp);
if (!canMove)
{
return; // don't allow movement
}
if (allowedMovement.X > 0.0f)
allowedMovement.X = Math.Min(allowedMovement.X, temp.X);
else if (allowedMovement.X < 0.0f)
allowedMovement.X = Math.Max(allowedMovement.X, temp.X);
if (allowedMovement.Y > 0.0f)
allowedMovement.Y = Math.Min(allowedMovement.Y, temp.Y);
else if (allowedMovement.Y < 0.0f)
allowedMovement.Y = Math.Max(allowedMovement.Y, temp.Y);
}
}
mover.move(allowedMovement);
}
