ease

Easing functions (for canvas etc)

Aliases

Example

var ease = require('ease');
var requestAnimationFrame = require('raf');
var canvas = document.querySelector('canvas');
var ctx = canvas.getContext('2d');

var stop = false;
function animate() {
  if (stop) return;
  requestAnimationFrame(animate);
  draw();
}

var startx = 20;
var x = startx;
var destx = 300;
var y = 400 / 2;
var duration = 1000;
var start = Date.now();
var end = start + duration;

function draw() {
  var now = Date.now();
  if (now - start >= duration) stop = true;
  var p = (now - start) / duration;
  val = ease.inOutBounce(p);
  x = startx + (destx - startx) * val;
  canvas.width = canvas.width;
  ctx.fillStyle = 'red';
  ctx.arc(x, y, 10, 0, Math.PI * 2, false);
  ctx.fill();
}

animate();

License

MIT