Change wrapping to use difference between coordinates and dimensions #52
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…e image dimension when wrapping a coordinate, rather than setting it to 0.
…e image dimension when wrapping a coordinate, rather than setting it to 0.
…ative coordinates.
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I observed some jitteriness in scrolling backgrounds and decided to look into it. The image coordinates were being set to 0 when they exceeded the image dimensions. It seems like this was a cause of some of the jitter. I modified it to use the difference instead.