easing

local easing = require'easing'

Robert Penner's easing functions.

easing[formula_name](t, b, c, d) -> value in b..c

The formulas map input d to output r, where d is in 0 .. t and r is in b + 0 .. c.

Usage for animation

easing[formula_name](t1 - t0, d0, d1, T) -> d

• t1 is the animation's current time
• t0 is the animation's start time
• d0 is the start value
• d1 is the end value
• T is the total animation duration
• d is the current value in d0..d1 corresponding to the current time

Some formulas take additional parameters (see code).