sh.ease

Robert Penner's handy easing equations for bash

Examples

Check the examples directory in this repository.

• svgCheatSheet.sh - script to generate a cheatsheet as svg (the one you see below)
• ascii-graphs.sh - script to plot character-based easing-graphs to terminal

Usage

#!/bin/bash

#include easing-functions
source easing.sh

quad_easeIn $time $begin $change $duration
quad_easeOut $time $begin $change $duration
quad_easeInOut $time $begin $change $duration
...

#to ease the x-value of something,    
#to make it move from x=50 to x= 250 in 100 steps    
#you would write something like:    

for i in {0..100}
do
  x=`circ_easeOut $i 50 200 100`
  #draw
done
...

Prerequisites

Nothing any unix-like system (UNIX / GNU/Linux / OS X) shouldn't come with

• bash - http://www.gnu.org/software/bash/
• bc - http://en.wikipedia.org/wiki/Bc_(programming_language)

Explicitly tested on GNU/Linux (Ubuntu 14.04 LTS/Debian 7.4) and OS X (10.6.2/10.8.5)

License

GNU General Public License v3

Reference

This SVG-Cheatsheet was generated with svgCheatSheet.sh in the examples directory