I am using the MouseState object as a controller and I noticed that delta X and delta Y don't zero themselves with the mouse is just sitting there. Instead they keep the last delta value. You can zero one axis by moving the mouse in the other axis while keeping that axis steady. So it looks like these values only update with the mouse is moving.
Is this the way the Max object is? It seems to me to be less useful this way, instead of zeroing itself when the mouse is standing still, but I could be wrong.
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