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Bouncing back cube

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I was wondering how one could make a cube move along the screen and once it reached a certain part, it would hit an imaginary wall and bounce back in the other direction. What I did so far is to translate a matrix along the X-axis, and then once the variable, iRotation, which is the variable which moves the cube, got to 10, I did this: if (iRotation == 10) iRotation = -iRotation; But, instead of bouncing back, it starts at the other side of the screen. Any ideas?? Thanx a lot!

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ok when I do this I have 2 sets of variables, one set that represents where the box is, and one set that represents how much it will move on the next frame. From the sound of your question it sounds to me like you are changing the actual position of the box when you reach an edge. Instead you should change the rate at which the box is moving. so fo instance if you have

if (iPosition == 10 || iPosition == -10) /*When it reaches the boundary*/
iRate = -iRate;

does that make sense? Maybe someone else could explain it a little more clearly

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