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Canvas Particles (2000)
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<html> | |
<head> | |
<style> | |
body { | |
margin: 0 | |
} | |
#container { | |
position: absolute; | |
background-color: #000; | |
} | |
</style> | |
</head> | |
<body> | |
<canvas id="container"> | |
</canvas> | |
<script> | |
var sprites = []; | |
var count = 0; | |
var globe = new Image(); | |
globe.src = 'globe.png'; | |
function addSprite() { | |
var sprite = { | |
vx: Math.random(), | |
vy: Math.random(), | |
x: Math.random() * 300, | |
y: Math.random() * 300, | |
image: globe | |
}; | |
sprites.push(sprite); | |
count++; | |
} | |
for ( i = 0; i < 2000; i++) { | |
addSprite(); | |
} | |
var canvas = document.getElementById('container'); | |
var width = 960; | |
var height = 500; | |
var ctx = canvas.getContext('2d'); | |
var s, t, i; | |
function render() { | |
canvas.setAttribute('width', width); | |
canvas.setAttribute('height', height); | |
for ( i = 0, l = count; i < l; i++) { | |
s = sprites[i]; | |
s.x += s.vx; | |
s.y += s.vy; | |
dx = clientX - s.x; | |
dy = clientY - s.y; | |
dist = Math.sqrt(dx * dx + dy * dy); | |
if (dist > 0) { | |
co = .3 / dist; | |
s.vx += co * dx; | |
s.vy += co * dy; | |
} | |
// drag | |
s.vx *= .995; | |
s.vy *= .995; | |
ctx.drawImage(s.image, ~~s.x, ~~s.y); | |
} | |
} | |
var clientX = 50, clientY = 50; | |
document.addEventListener('mousemove', function(e) { | |
clientX = e.clientX; | |
clientY = e.clientY; | |
}); | |
var transformProperty; | |
function setupBrowser() { | |
if (window.requestAnimationFrame) { | |
window.requestAnimFrame = window.requestAnimationFrame; | |
transformProperty = 'transform'; | |
} else if (window.webkitRequestAnimationFrame) { | |
window.requestAnimFrame = window.webkitRequestAnimationFrame; | |
transformProperty = 'webkitTransform'; | |
} else if (window.mozRequestAnimationFrame) { | |
window.requestAnimFrame = window.mozRequestAnimationFrame; | |
transformProperty = 'MozTransform'; | |
} else { | |
window.requestAnimFrame = function(callback) { | |
window.setTimeout(callback, 1000 / 60); | |
}; | |
} | |
} | |
setupBrowser(); | |
(function animloop() { | |
window.requestAnimFrame(animloop); | |
render(); | |
})(); | |
</script> | |
</body> | |
</html> |
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