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OSUblake

ModifiersPlugin helper functions

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Just wanted to share some nice functions I came across that can be used with the ModifiersPlugin.

 

Doing a normal modulus calculation restarts the value at 0, which may not be what you want.

500 % 500 // => 0

This function will allow you to do a modulus operation for a min/max range.

wrap(500, -100, 500); // => -100

function wrap(value, min, max) {
  var v = value - min;
  var r = max - min;

  return ((r + v % r) % r) + min;
}

And this is a modified version of that function that will make the modulus value "yoyo".

 

mirroredWrap(600, -100, 500); // => 400

function mirroredWrap(value, min, max) {
  
  var v  = value - min;
  var r1 = max - min;
  var r2 = r1 * 2;
  
  v = (r2 + v % r2) % r2;
  
  return v > r1 ? (r2 - v) + min : v + min;
}
 

With the first wrap function you can do some interesting stuff, like making an object appear in two different places, kind of like in those old asteroid games.

https://codepen.io/osublake/pen/XpbmYr/?editors=0010

 

And with the mirroredWrap, you can do stuff like creating multiple bounces with a single tween.

See the Pen mRJeNX by osublake (@osublake) on CodePen

 

.

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Slick stuff, Blake! Thanks for sharing. 

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