Audrey Sitnik

• Translated from the JavaScript in Sean Yen’s Easing equations
• Illustrations adapted from Andrey Sitnik and Ivan Solovev’s Easings.net

Example usage:

duration = 30
for frame in range(duration):
    return ease_in_out_quad(frame/duration)

linear

def linear(t):
    return t

ease_in_sine

def ease_in_sine(t):
    import math
    return -math.cos(t * math.pi / 2) + 1

ease_out_sine

def ease_out_sine(t):
    import math
    return math.sin(t * math.pi / 2)

ease_in_out_sine

def ease_in_out_sine(t):
    import math
    return -(math.cos(math.pi * t) - 1) / 2

ease_in_quad

def ease_in_quad(t):
    return t * t

ease_out_quad

def ease_out_quad(t):
    return -t * (t - 2)

ease_in_out_quad

def ease_in_out_quad(t):
    t *= 2
    if t < 1:
        return t * t / 2
    else:
        t … See more →