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Easing Equations in Python (orig by Robert Penner)
# 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
@MarioMey

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@MarioMey MarioMey commented Jul 26, 2016

I arrive here looking for easeOutElastic for Python... but you didn't port it. If you do it, I would like to be informed.
I didn't try your code (I had done mine some time ago for using in Blender Game Engine here), but I found a semicolon at line 97... is that a bug?

Thanks, anyway.

@brunokruse

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@brunokruse brunokruse commented Mar 30, 2017

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.

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