Created
March 31, 2014 01:32
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Easing Equations in Python (orig by Robert Penner)
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| # ported from http://www.gizma.com/easing/ | |
| # by http://th0ma5w.github.io | |
| # | |
| # untested :P | |
| import math | |
| linearTween = lambda t, b, c, d : c*t/d + b | |
| def easeInQuad(t, b, c, d): | |
| t /= d | |
| return c*t*t + b | |
| def easeOutQuad(t, b, c, d): | |
| t /= d | |
| return -c * t*(t-2) + b | |
| def easeInOutQuad(t, b, c, d): | |
| t /= d/2 | |
| if t < 1: | |
| return c/2*t*t + b | |
| t-=1 | |
| return -c/2 * (t*(t-2) - 1) + b | |
| def easeInOutCubic(t, b, c, d): | |
| t /= d/2 | |
| if t < 1: | |
| return c/2*t*t*t + b | |
| t -= 2 | |
| return c/2*(t*t*t + 2) + b | |
| def easeInQuart(t, b, c, d): | |
| t /= d | |
| return c*t*t*t*t + b | |
| def easeOutQuart(t, b, c, d): | |
| t /= d | |
| t -= 1 | |
| return -c * (t*t*t*t - 1) + b | |
| def easeInOutQuart(t, b, c, d): | |
| t /= d/2 | |
| if t < 1: | |
| return c/2*t*t*t*t + b | |
| t -= 2 | |
| return -c/2 * (t*t*t*t - 2) + b | |
| def easeInQuint(t, b, c, d): | |
| t /= d | |
| return c*t*t*t*t*t + b | |
| def easeOutQuint(t, b, c, d): | |
| t /= d | |
| t -= 1 | |
| return c*(t*t*t*t*t + 1) + b | |
| def easeInOutQuint(t, b, c, d): | |
| t /= d/2 | |
| if t < 1: | |
| return c/2*t*t*t*t*t + b | |
| t -= 2 | |
| return c/2*(t*t*t*t*t + 2) + b | |
| def easeInSine(t, b, c, d): | |
| return -c * math.cos(t/d * (math.pi/2)) + c + b | |
| def easeOutSine(t, b, c, d): | |
| return c * math.sin(t/d * (math.pi/2)) + b | |
| def easeInOutSine(t, b, c, d): | |
| return -c/2 * (math.cos(math.pi*t/d) - 1) + b | |
| def easeInExpo(t, b, c, d): | |
| return c * math.pow( 2, 10 * (t/d - 1) ) + b | |
| def easeOutExpo(t, b, c, d): | |
| return c * ( -math.pow( 2, -10 * t/d ) + 1 ) + b | |
| def easeInOutExpo(t, b, c, d): | |
| t /= d/2 | |
| if t < 1: | |
| return c/2 * math.pow( 2, 10 * (t - 1) ) + b | |
| t -= 1 | |
| return c/2 * ( -math.pow( 2, -10 * t) + 2 ) + b | |
| def easeInCirc(t, b, c, d): | |
| t /= d | |
| return -c * (math.sqrt(1 - t*t) - 1) + b | |
| def easeOutCirc(t, b, c, d): | |
| t /= d; | |
| t -= 1 | |
| return c * math.sqrt(1 - t*t) + b | |
| def easeInOutCirc(t, b, c, d): | |
| t /= d/2 | |
| if t < 1: | |
| return -c/2 * (math.sqrt(1 - t*t) - 1) + b | |
| t -= 2 | |
| return c/2 * (math.sqrt(1 - t*t) + 1) + b |
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t is the current time (or position) of the tween.
b is the beginning value of the property.
c is the change between the beginning and destination value of the property.
d is the total time of the tween.