Power of Negative 1
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There will be times when you just want an image or a sprite to flip horizontally. Instead of creating another version of the image, multiply the x-axis by negative 1.
Multiple the first value (x-axis) by -1...
Additionally, if you were to multiply by -1 on the Y-Axis, you can flip it vertically.
In some languages and programs, simply multiplying the speed by -1 can reverse the animation.
