I loved the animations for the polygon ps4 review a few months back and decided to create a small library to re-create them.

Create a new Walkway instance with a supplied options object. When you want to start animating call .draw on the returned instance providing an optional callback that will be called when drawing is complete.

// Create a new instance
var svg = new Walkway(options);
// Draw when ready, providing an optional callback
svg.draw(callback);

// Options passed in as an object, see options below.
var svg = new Walkway({ selector: '#test'});

// Overwriting defaults
var svg = new Walkway({
  selector: '#test',
  duration: '2000',
  // can pass in a function or a string like 'easeOutQuint'
  easing: function (t) {
    return t * t;
  }
});

svg.draw();

// If you don't want to change the default options you can
// also supply the constructor with a selector string.
var svg = new Walkway('#test');

svg.draw(function () {
  console.log('Animation finished');
});

• selector (mandatory) - The selector of the parent element (usually will be a specific svg element)
• duration - Time the animation should run for, in ms. Default is 400.
• easing - Name of the easing function used for drawing. Default is 'easeInOutCubic'. You can also supply your own function that will be passed the progress and should return a value in the range of [0, 1];

All credit for the built-in easing functions go to gre from this gist.

Currently, this only works on path and line elements. Walkway will also work with polyline elements when I have a few hours free.