public static void ResolvePlatformCollisions(MovingSprite sprite, SortedList<int, Platform> platforms)
{
foreach (KeyValuePair<int, Platform> platform in platforms)
{
RectangleHelper playerRec = new RectangleHelper(sprite.currentPOS.X, sprite.currentPOS.Y, sprite.getWidth(), sprite.getHeight());
RectangleHelper platformRec = new RectangleHelper(platform.Value.originalPosition.X, platform.Value.originalPosition.Y, platform.Value.getWidth(), platform.Value.getHeight());
Vector2 overlap = RectangleHelper.Collide(playerRec, platformRec);
PushSprite(sprite, overlap);
}
}
public static Vector2 Collide(RectangleHelper r1, RectangleHelper r2)
{
//find the center of each rectangle
Vector2 r1Center = new Vector2(r1.X + r1.Width / 2, r1.Y + r1.Height / 2);
Vector2 r2Center = new Vector2(r2.X + r2.Width / 2, r2.Y + r2.Height / 2);
//distance from one rectangle to the other
float xDistance = Math.Abs(r1Center.X - r2Center.X);
float yDistance = Math.Abs(r1Center.Y - r2Center.Y);
//Minimum distance from one rectangle to the other without colliding
float xMinDistance = r1.Width / 2 + r2.Width / 2;
float yMinDistance = r1.Height / 2 + r2.Height / 2;
//if they do not collide return vector2.zero
if (xDistance >= xMinDistance || yDistance >= yMinDistance)
return Vector2.Zero;
//else return the amount of overlap
return new Vector2(xMinDistance - xDistance, yMinDistance - yDistance);
}
