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Copy pathscript.js
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73 lines (64 loc) · 1.5 KB
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function gimmick(el) {
var exists = document.getElementById("gimmick");
if (exists) {
exists.parentNode.removeChild(exists);
return false;
}
var element = document.querySelector(el);
var canvas = document.createElement("canvas"),
ctx = canvas.getContext("2d"),
focused = false;
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
canvas.id = "gimmick";
var coin = new Image();
coin.src = "http://i.imgur.com/5ZW2MT3.png";
// 440 wide, 40 high, 10 states
coin. {
element.appendChild(canvas);
focused = true;
drawloop();
};
var coins = [];
function drawloop() {
if (focused) {
requestAnimationFrame(drawloop);
}
ctx.clearRect(0, 0, canvas.width, canvas.height);
if (Math.random() < 0.3) {
coins.push({
x: (Math.random() * canvas.width) | 0,
y: -50,
dy: 3,
s: 0.5 + Math.random(),
state: (Math.random() * 10) | 0
});
}
var i = coins.length;
while (i--) {
var x = coins[i].x;
var y = coins[i].y;
var s = coins[i].s;
var state = coins[i].state;
coins[i].state = state > 9 ? 0 : state + 0.1;
coins[i].dy += 0.3;
coins[i].y += coins[i].dy;
ctx.drawImage(
coin,
44 * Math.floor(state),
0,
44,
40,
x,
y,
44 * s,
40 * s
);
if (y > canvas.height) {
coins.splice(i, 1);
}
}
}
}
// Make it rain
gimmick("body");