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<!DOCTYPE html> | |
<html> | |
<!-- | |
Based on: http://www.reddit.com/r/gifs/comments/2on8si/connecting_to_server_so_mesmerizing/ | |
See also: http://codepen.io/anon/pen/OPMvOb | |
http://jsbin.com/xecosiyomo/1/edit?js,output | |
--> | |
<head> | |
<title>Mesmerizing</title> | |
<style> | |
canvas { background-color: #000; } | |
</style> | |
<script> | |
window.requestAnimFrame = (function(callback) { | |
return window.requestAnimationFrame || | |
window.webkitRequestAnimationFrame || | |
window.mozRequestAnimationFrame || | |
window.oRequestAnimationFrame || | |
window.msRequestAnimationFrame || | |
function(callback) { | |
window.setTimeout(callback, 1000 / 60); | |
}; | |
})(); | |
var NUM_BALL = 60; | |
var BALL_HEIGHT = 100; | |
var timeStep = 0; | |
var radius = 3; | |
var color = '#0f0'; | |
var lastY = []; | |
var c, ctx; | |
function draw() { | |
c = document.getElementById('screen'); | |
if (c.getContext) { | |
ctx = c.getContext('2d'); | |
requestAnimFrame(animateBalls); | |
} | |
} | |
function animateBalls() { | |
var y, lY, m; | |
ctx.clearRect(0, 0, c.width, c.height); | |
for (var i = 0; i < NUM_BALL; i++) { | |
y = getY(i, timeStep); | |
lY = lastY[i] || 0; | |
m = (lY < y) ? 1 : -1; | |
lastY[i] = y; | |
ctx.beginPath(); | |
ctx.arc(8+16*i, y, radius + m, 0, Math.PI*2, true); | |
ctx.fillStyle = color; | |
ctx.fill(); | |
} | |
timeStep++; | |
requestAnimFrame(animateBalls); | |
} | |
function getY(i, t) { | |
return 150 + BALL_HEIGHT/2 * (1 + Math.sin((t * (i/500 + 0.02)) % 2*Math.PI)); | |
} | |
window.addEventListener('load', draw); | |
</script> | |
</head> | |
<body> | |
<canvas id="screen" width="480" height="360"></canvas> | |
</body> | |
</html> |
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