Flux
Flux is a fast, lightweight tweening library for lua.
Flux allows the user to easily interpolate a numerical value field of an object between its current value to a new value over a specified duration, using a specified easing type. If you want to do something like fade a sprite in or out, slide something onto the screen, gradually enlarge something or fade something from one color to another, Flux provides a means of doing this with a single function call.
Check out the README for instructions on setting up and using flux in your projects. The github page for flux is over here.
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