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/*global */
(function() {
// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating
// requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel
// MIT license
var lastTime = 0;
var vendors = ['ms', 'moz', 'webkit', 'o'];
for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] ||
window[vendors[x]+'CancelRequestAnimationFrame'];
}
if (!window.requestAnimationFrame) {
window.requestAnimationFrame = function(callback, element) {
var currTime = new Date().getTime();
var timeToCall = Math.max(0, 16 - (currTime - lastTime));
var id = window.setTimeout(function() { callback(currTime + timeToCall); },
timeToCall);
lastTime = currTime + timeToCall;
return id;
};
}
if (!window.cancelAnimationFrame) {
window.cancelAnimationFrame = function(id) {
clearTimeout(id);
};
}
}());
Element.prototype.hasClassName = function (a) {
return new RegExp("(?:^|\\s+)" + a + "(?:\\s+|$)").test(this.className);
};
Element.prototype.addClassName = function (a) {
if (!this.hasClassName(a)) {
this.className = [this.className, a].join(" ");
}
};
Element.prototype.removeClassName = function (b) {
if (this.hasClassName(b)) {
var a = this.className;
this.className = a.replace(new RegExp("(?:^|\\s+)" + b + "(?:\\s+|$)", "g"), " ");
}
};
Element.prototype.toggleClassName = function (a) {
this[this.hasClassName(a) ? "removeClassName" : "addClassName"](a);
};
function toDegrees (angle) {
return angle * (180 / Math.PI);
}
function toRadians (angle) {
return angle * (Math.PI / 180);
}
function deadCenter(){
var el = document.querySelectorAll('#main')[0];
el.style.lineHeight = window.innerHeight+'px';
}
var Shoreditch = function( elem ) {
this.elem = elem;
this.panes = parseInt( this.elem.getAttribute('data-panes'), 15 );
this.colorTime = ~~( Math.random() * 360 );
this.waveTheta = 0;
this.colorIncrement = -1;
this.degrees = 1;
this.animate();
};
Shoreditch.prototype.getTextShadow = function( x, y, blur, hue, alpha ) {
return ', ' + x + 'px ' + y + 'px ' + blur + 'px ' + 'hsla(' + hue + ', 100%, 45%, ' + alpha + ')';
};
Shoreditch.prototype.animate = function() {
var shadows = '0 0 transparent',
i, j, x, y;
this.degrees = (this.degrees !== void 0) ? this.degrees - 1 : 0;
// renders rainbow river
for ( i = 1; i < this.panes; i++ ) {
var normI = i / this.panes;
var hue = ( normI * 50 + this.colorTime * 0.5 ) % 360;
var alpha = ( 1 - normI ) * 0.8;
x = Math.cos(toRadians(this.degrees + i*Math.PI*Math.PI)) * i*(i/10);
// x = 0;
y = Math.sin(toRadians(this.degrees + i*Math.PI*Math.PI)) * i*(i*2);
shadows += this.getTextShadow( x, y, i*(i/5), hue, alpha );
}
this.elem.style.textShadow = shadows;
this.colorTime += this.colorIncrement;
window.requestAnimationFrame( this.animate.bind( this ) );
};
window.addEventListener( 'resize', deadCenter );
window.addEventListener( 'DOMContentLoaded', function() {
deadCenter();
var grov = new Shoreditch(document.querySelectorAll('#txt')[0]);
}, false );
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