Tweeny is an inbetweening library designed for the creation of complex animations for games and other beautiful interactive software. It leverages features of modern C++ to empower developers with an intuitive API for declaring tweenings of any type of value, as long as they support arithmetic operations.

This document contains Tweeny's API reference. The most interesting parts are:

The Fine Tweeny Manual
The tweeny::from global function, to start a new tween.
The tweeny::tween class itself, that has all the interesting methods for a tween.
The modules page has a list of type of easings.

This is how the API looks like:

#include "tweeny.h"
using tweeny::easing;
int main() {
 // steps 1% each iteration
 auto tween = tweeny::from(0).to(100).during(100).via(easing::linear);
 while (tween.progress() < 1.0f) tween.step(0.01f);
 // a tween with multiple values
 auto tween2 = tweeny::from(0, 1.0f).to(1200, 7.0f).during(1000).via(easing::backInOut, easing::linear);
 // a tween with multiple points, different easings and durations
 auto tween3 = tweeny::from(0, 0)
                 .to(100, 100).during(100).via(easing::backOut, easing::backOut)
                 .to(200, 200).during(500).via(easing::linear);
 return 0;
}

Examples

Check tweeny-demos repository to see demonstration code

Useful links and references