pytweening 1.0.0

A collection of tweening / easing functions.

PyTweening

A collection of tweening / easing functions implemented in Python. The tweening functions are passed the “time elapsed” value between 0.0 (start time) and 1.0 (end time) and return a “distance traveled” value between 0.0 (start point) and 1.0 (end point). The returned value could be greater than 1.0 for tweens that go past the end point, such as the elastic tween.

See the graphs in this Excel spreadsheet to see the behavior of the ease in, ease out, and ease in-out tweens: https://github.com/asweigart/pytweening/blob/master/tests/graphs.xlsx

And also here: https://i.imgur.com/KYaNM6b.png

Example Usage

All tweening / easing functions are passed an argument of a float from 0.0 (for the beginning) to 1.0 (for the end) of the tween:

>>> pytweening.linear(0.5)
0.5
>>> pytweening.linear(0.75)
0.75
>>> pytweening.linear(1.0)
1.0
>>> pytweening.easeInQuad(0.5)
0.25
>>> pytweening.easeInQuad(0.75)
0.5625
>>> pytweening.easeInQuad(1.0)
1.0
>>> pytweening.easeInOutSine(0.5)
0.49999999999999994
>>> pytweening.easeInOutSine(0.75)
0.8535533905932737
>>> pytweening.easeInOutSine(1.0)
1.0

The getLine() function also provides a Bresenham line algorithm implementation:

>>> pytweening.getLine(0, 0, 5, 10)
[(0, 0), (0, 1), (1, 2), (1, 3), (2, 4), (2, 5), (3, 6), (3, 7), (4, 8), (4, 9), (5, 10)]

The getLinePoint() function finds a point on the provided line (even if it extends before or past the start or end points):

>>> getLinePoint(0, 0, 5, 10, 0.0)
(0.0, 0.0)
>>> getLinePoint(0, 0, 5, 10, 0.25)
(1.25, 2.5)
>>> getLinePoint(0, 0, 5, 10, 0.5)
(2.5, 5.0)
>>> getLinePoint(0, 0, 5, 10, 0.75)
(3.75, 7.5)
>>> getLinePoint(0, 0, 5, 10, 1.0)
(5.0, 10.0)