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zodiac.js
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/*!
* Zodiac
*
* @author Stefan Keim (indus)
* @version 0.1.1
* @description canvas based particle background
*
* Inspired by https://github.com/jnicol/particleground
*/
// 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
"use static";
var Zodiac = (function () {
function Zodiac(canvas, options) {
var _this = this;
if (options === void 0) { options = {}; }
this.options = {
directionX: -1,
directionY: -1,
velocityX: [.1, .2],
velocityY: [.5, 1],
bounceX: true,
bounceY: false,
parallax: .2,
pivot: 0,
density: 6000,
dotRadius: [1, 5],
//backgroundColor: 'rgba(9,9,9,1)', // default transparent; use alpha value for motion blur and ghosting
//dotColor: 'rgba(99,99,99,.5)',
linkColor: 'rgba(99,99,99,.8)',
linkDistance: 50,
linkWidth: 2
};
var canvas = (typeof canvas == 'string' || canvas instanceof String) ? document.getElementById(canvas) : canvas;
if (canvas.tagName != 'CANVAS')
throw "no canvas";
for (var key in options) {
this.options[key] = options[key];
}
options = this.options;
var ctx = this._ctx = canvas.getContext('2d', { alpha: !options.backgroundColor }), tilt = { x: 0, y: 0 }, _, w, h;
var update = function () {
if (options.backgroundColor) {
ctx.fillStyle = options.backgroundColor;
ctx.fillRect(0, 0, w, h);
ctx.fillStyle = options.dotColor;
}
else {
ctx.clearRect(0, 0, w, h);
}
ctx.beginPath();
for (var i = 0, p, x, y; i < _.length; i++) {
p = _[i];
/* MOVE */
p.x += p.vx;
p.y += p.vy;
/* POSITION */
if (options.parallax) {
var fac = p.z * options.parallax;
p.dx += (tilt.x * fac - p.dx) / 10;
p.dy += (tilt.y * fac - p.dy) / 10;
}
x = p.x + p.dx;
y = p.y + p.dy;
if (x < 0 || x > w)
(options.bounceX) ? (p.vx = -p.vx) : (p.x = ((x + w) % w) - p.dx);
if (y < 0 || y > h)
(options.bounceY) ? (p.vy = -p.vy) : (p.y = ((y + h) % h) - p.dy);
/* DRAW */
ctx.moveTo(x + p.r, y);
ctx.arc(x, y, p.r, 0, Math.PI * 2);
for (var j = i - 1; j >= 0; j--) {
var q = _[j], dx = q.x - p.x, dy = q.y - p.y, dist = Math.sqrt((dx * dx) + (dy * dy));
if (dist < options.linkDistance) {
var x = p.x + p.dx, y = p.y + p.dy, x2 = q.x + q.dx, y2 = q.y + q.dy, a = Math.atan2(y2 - y, x2 - x), cos = Math.cos(a), sin = Math.sin(a);
x += p.r * cos;
y += p.r * sin;
x2 -= q.r * cos;
y2 -= q.r * sin;
ctx.moveTo(x, y);
ctx.lineTo(x2, y2);
}
}
}
;
ctx.stroke();
options.dotColor && ctx.fill();
requestAnimationFrame(update);
};
function onMousemove(ev) {
tilt.x = ev.pageX - window.innerWidth / 2;
tilt.y = ev.pageY - window.innerHeight / 2;
}
function onOrientation(ev) {
tilt.x = Math.min(Math.max(-ev.gamma, -30), 30) * (window.innerWidth / 30);
tilt.y = Math.min(Math.max(-ev.beta, -30), 30) * (window.innerHeight / 30);
}
var onResize = this._refresh = function () {
_ = _this._ = _this._ || [];
var radius = [].concat(options.dotRadius);
if (radius.length == 1 || radius[0] == radius[1]) {
radius = radius[0];
}
;
w = canvas.width = canvas.offsetWidth;
h = canvas.height = canvas.offsetHeight;
var vx = options.velocityX, vy = options.velocityY, random = Math.random;
var num = Math.ceil((w * h) / options.density);
for (var i = _.length - 1; i >= 0; i--)
if (_[i].x > w || _[i].y > h)
_.splice(i, 1);
if (num < _.length)
_.splice(num);
while (num > _.length) {
var r = random();
_.push({
// position
z: (r - options.pivot) / 4,
r: radius[1] ? (r * (radius[1] - radius[0]) + radius[0]) : radius,
x: Math.ceil(random() * w),
y: Math.ceil(random() * h),
// velocity: (random)direction * clamped random velocity
vx: (options.directionX || ((random() > .5) ? 1 : -1)) * (random() * (vx[1] - vx[0]) + vx[0]),
vy: (options.directionY || ((random() > .5) ? 1 : -1)) * (random() * (vy[1] - vy[0]) + vy[0]),
// offset
dx: 0,
dy: 0
});
}
ctx.strokeStyle = options.linkColor;
ctx.lineWidth = options.linkWidth;
ctx.fillStyle = options.dotColor;
};
window.addEventListener('resize', onResize, false);
document.addEventListener('mousemove', onMousemove, false);
window.addEventListener('deviceorientation', onOrientation, false);
onResize();
update();
}
return Zodiac;
})();
(function () {
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);
};
}());