XNA:Rectangles Movement Behavior

Question

im trying to create simple pong game, and learning some XNA. im creating for each paddle 3 rectangles, who represnt the collision when the ball hit them, so i can dicide where to throw the ball back.

here is the function that i create the rectangles:

List<Rectangle> collisonRectanglesList = new List<Rectangle>(3);
      private void creatCollisonRectangles()
        {
 smallPaddleWidth = collisionRect.Width;
             smallPaddleHeight = collisionRect.Height / 3;
            for (int i = 0; i < collisonRectanglesList.Count; i++)
            {
                if (collisonRectanglesList[i] != null)
                    collisonRectanglesList.RemoveAt(i);
            }    
             collisonRectanglesList.Add(new Rectangle((int)position.X + smallPaddleWidth, (int)position.Y + smallPaddleHeight * 2, smallPaddleWidth, smallPaddleHeight));
             collisonRectanglesList.Add(new Rectangle((int)position.X + smallPaddleWidth, (int)position.Y + smallPaddleHeight, smallPaddleWidth, smallPaddleHeight));
             collisonRectanglesList.Add(new Rectangle((int)position.X + smallPaddleWidth, (int)position.Y , smallPaddleWidth, smallPaddleHeight));
            
        }

now i want this to follow the paddle it self so i put this function in the update method and made a simple texture so i can draw them and see where they are on the screen.

my problem is that when i call the creatCollisonRectangles() 1 of the rectangles paint it self in the middle and not in the place it should be.

any idea why?

this is when im not calling it in the Update method:

and this when i do:

(sorry for my english)

Answer 1

It looks like you're generating new collision rectangles every update and this probably means that you're a) overriding the rectangle you mean to draw or b) trying to access a rectangle which no longer exists. Creating the rectangles once then updating their positions would fix that (not to mention be much more efficient that allocating new rectangles every fraction of a second ;) ).