PyTweening

在Python中实现的缓动（又称缓动函数）集合。您可以在以下博客文章中了解更多信息： https://inventwithpython.com/blog/2024/02/20/make-lively-movement-animation-with-pytweenings-tweening-functions/ 以及Martin Jonasson和Petri Purho在 https://youtu.be/Fy0aCDmgnxg?si=8pgITaxjJSKFyBuB&t=159 上的Nordic Game Jam演讲

示例用法

所有缓动函数都传递一个从0.0（路径的起点）到1.0（路径的终点）的浮点数参数。

>>> 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(0.75)
0.8535533905932737
>>> pytweening.easeInOutSine(1.0)
1.0

getLine()函数还提供了一个Bresenham线算法实现。

>>> 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)]

getLinePoint()函数在给定的线上找到（插值）一个点（即使它延伸到起点或终点之前或之后）。

>>> 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)

PyTweening还提供了迭代器，以在两个点之间获取XY坐标（尽管可能发生一些浮点数舍入误差）。

>>> import pytweening
>>> for x, y in pytweening.iterLinear(0, 0, 100, 150, 0.1): print(x, y)
...
0.0 0.0
10.0 15.0
20.0 30.0
30.000000000000004 45.00000000000001
40.0 60.0
50.0 75.0
60.0 90.0
70.0 105.0
80.0 119.99999999999999
89.99999999999999 135.0
100.0 150.0
>>> for x, y in pytweening.iterEaseOutQuad(0, 0, 100, 150, 0.1): print(x, y)
...
0.0 0.0
19.0 28.5
36.00000000000001 54.00000000000001
51.0 76.5
64.00000000000001 96.00000000000001
75.0 112.5
84.0 126.0
90.99999999999999 136.5
96.00000000000001 144.0
99.0 148.5
100.0 150.0

缓动

pytweening.linear()

pytweening.easeInQuad()

pytweening.easeOutQuad()

pytweening.easeInOutQuad()

pytweening.easeInCubic()

pytweening.easeOutCubic()

pytweening.easeInOutCubic()

pytweening.easeInQuart()

pytweening.easeOutQuart()

pytweening.easeInOutQuart()

pytweening.easeInQuint()

pytweening.easeOutQuint()

pytweening.easeInOutQuint()

pytweening.easeInSine()

pytweening.easeOutSine()

pytweening.easeInOutSine()

pytweening.easeInExpo()

pytweening.easeOutExpo()

pytweening.easeInOutExpo()

pytweening.easeInCirc()

pytweening.easeOutCirc()

pytweening.easeInOutCirc()

pytweening.easeInElastic()

pytweening.easeOutElastic()

pytweening.easeInOutElastic()

pytweening.easeInBack()

pytweening.easeOutBack()

pytweening.easeInOutBack()

pytweening.easeInBounce()

pytweening.easeOutBounce()

pytweening.easeInOutBounce()

pytweening.easeInPoly() (默认次数为2)

pytweening.easeOutPoly() (默认次数为2)

pytweening.easeInOutPoly() (默认次数为2)

支持

如果您觉得这个项目有帮助，并希望支持其发展，请考虑在Patreon上向其创作者捐赠https://www.patreon.com/AlSweigart。