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/* | |
* requestAnimationFrame pollyfill | |
*/ | |
if (!window.requestAnimationFrame) { | |
window.requestAnimationFrame = (window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.msRequestAnimationFrame || window.oRequestAnimationFrame || function (callback) { | |
return window.setTimeout(callback, 1000 / 60); | |
}); | |
} | |
/*! | |
* Mantis.js / jQuery / Zepto.js plugin for Constellation | |
* @version 1.2.2 | |
* @author Acauã Montiel <[email protected]> | |
* @license http://acaua.mit-license.org/ | |
*/ | |
(function ($, window) { | |
/** | |
* Makes a nice constellation on canvas | |
* @constructor Constellation | |
*/ | |
function Constellation (canvas, options) { | |
var $canvas = $(canvas), | |
context = canvas.getContext('2d'), | |
defaults = { | |
star: { | |
color: 'rgba(255, 255, 255, .5)', | |
width: 1 | |
}, | |
line: { | |
color: 'rgba(255, 255, 255, .5)', | |
width: 0.2 | |
}, | |
position: { | |
x: 0, // This value will be overwritten at startup | |
y: 0 // This value will be overwritten at startup | |
}, | |
width: window.innerWidth, | |
height: window.innerHeight, | |
velocity: 0.1, | |
length: 100, | |
distance: 120, | |
radius: 150, | |
stars: [] | |
}, | |
config = $.extend(true, {}, defaults, options); | |
function Star () { | |
this.x = Math.random() * canvas.width; | |
this.y = Math.random() * canvas.height; | |
this.vx = (config.velocity - (Math.random() * 0.5)); | |
this.vy = (config.velocity - (Math.random() * 0.5)); | |
this.radius = Math.random() * config.star.width; | |
} | |
Star.prototype = { | |
create: function(){ | |
context.beginPath(); | |
context.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false); | |
context.fill(); | |
}, | |
animate: function(){ | |
var i; | |
for (i = 0; i < config.length; i++) { | |
var star = config.stars[i]; | |
if (star.y < 0 || star.y > canvas.height) { | |
star.vx = star.vx; | |
star.vy = - star.vy; | |
} else if (star.x < 0 || star.x > canvas.width) { | |
star.vx = - star.vx; | |
star.vy = star.vy; | |
} | |
star.x += star.vx; | |
star.y += star.vy; | |
} | |
}, | |
line: function(){ | |
var length = config.length, | |
iStar, | |
jStar, | |
i, | |
j; | |
for (i = 0; i < length; i++) { | |
for (j = 0; j < length; j++) { | |
iStar = config.stars[i]; | |
jStar = config.stars[j]; | |
if ( | |
(iStar.x - jStar.x) < config.distance && | |
(iStar.y - jStar.y) < config.distance && | |
(iStar.x - jStar.x) > - config.distance && | |
(iStar.y - jStar.y) > - config.distance | |
) { | |
if ( | |
(iStar.x - config.position.x) < config.radius && | |
(iStar.y - config.position.y) < config.radius && | |
(iStar.x - config.position.x) > - config.radius && | |
(iStar.y - config.position.y) > - config.radius | |
) { | |
context.beginPath(); | |
context.moveTo(iStar.x, iStar.y); | |
context.lineTo(jStar.x, jStar.y); | |
context.stroke(); | |
context.closePath(); | |
} | |
} | |
} | |
} | |
} | |
}; | |
this.createStars = function () { | |
var length = config.length, | |
star, | |
i; | |
context.clearRect(0, 0, canvas.width, canvas.height); | |
for (i = 0; i < length; i++) { | |
config.stars.push(new Star()); | |
star = config.stars[i]; | |
star.create(); | |
} | |
star.line(); | |
star.animate(); | |
}; | |
this.setCanvas = function () { | |
canvas.width = config.width; | |
canvas.height = config.height; | |
}; | |
this.setContext = function () { | |
context.fillStyle = config.star.color; | |
context.strokeStyle = config.line.color; | |
context.lineWidth = config.line.width; | |
}; | |
this.setInitialPosition = function () { | |
if (!options || !options.hasOwnProperty('position')) { | |
config.position = { | |
x: canvas.width * 0.5, | |
y: canvas.height * 0.5 | |
}; | |
} | |
}; | |
this.loop = function (callback) { | |
callback(); | |
window.requestAnimationFrame(function () { | |
this.loop(callback); | |
}.bind(this)); | |
}; | |
this.bind = function () { | |
$canvas.on('mousemove', function(e){ | |
config.position.x = e.pageX - $canvas.offset().left; | |
config.position.y = e.pageY - $canvas.offset().top; | |
}); | |
}; | |
this.init = function () { | |
this.setCanvas(); | |
this.setContext(); | |
this.setInitialPosition(); | |
this.loop(this.createStars); | |
this.bind(); | |
}; | |
} | |
$.fn.constellation = function (options) { | |
return this.each(function () { | |
var c = new Constellation(this, options); | |
c.init(); | |
}); | |
}; | |
})($, window); | |
// Init plugin | |
$('canvas').constellation({ | |
star: { | |
width: 3 | |
}, | |
line: { | |
color: 'rgba(255, 0, 0, .5)' | |
}, | |
radius: 250 | |
}); |
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