Introduction

What is Str8Tween ? To answer quickly it's a tween engine.
But if you don't know about tweens and tween engines yet, here are some definitions.

What is a tween ?

The word "tween" comes from "between" and can be used as a noun or a verb.
In computer graphics, animation or cinematography it's the action of generating intermediates frames in an animated sequence to obtain smooth movements.

In mathematics it's a method of constructing new data points within the range of a set of known data points.
An ease can be applied to a tween to modify the rate of change of the calculated data points over time.

In Str8Tween a tween is what holds the calculations of new values and apply them to the target.
To customise tweens I implemented Robert Penner's easing equations.
See easings.net to visualize each easing function.

What are tween engines ?

According to the previous definition a tween engine can be defined as a piece of software that performs tweening.
It provides methods to create tweens and manage them along their lifecycles.