Created
February 17, 2018 15:08
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(function() { | |
var COLORS, Confetti, NUM_CONFETTI, PI_2, canvas, confetti, context, drawCircle, i, range, resizeWindow, xpos; | |
NUM_CONFETTI = 350; | |
COLORS = [[85, 71, 106], [174, 61, 99], [219, 56, 83], [244, 92, 68], [248, 182, 70]]; | |
PI_2 = 2 * Math.PI; | |
canvas = document.getElementById("world"); | |
context = canvas.getContext("2d"); | |
window.w = 0; | |
window.h = 0; | |
resizeWindow = function() { | |
window.w = canvas.width = window.innerWidth; | |
return window.h = canvas.height = window.innerHeight; | |
}; | |
window.addEventListener('resize', resizeWindow, false); | |
window.onload = function() { | |
return setTimeout(resizeWindow, 0); | |
}; | |
range = function(a, b) { | |
return (b - a) * Math.random() + a; | |
}; | |
drawCircle = function(x, y, r, style) { | |
context.beginPath(); | |
context.arc(x, y, r, 0, PI_2, false); | |
context.fillStyle = style; | |
return context.fill(); | |
}; | |
xpos = 0.5; | |
document.onmousemove = function(e) { | |
return xpos = e.pageX / w; | |
}; | |
window.requestAnimationFrame = (function() { | |
return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(callback) { | |
return window.setTimeout(callback, 1000 / 60); | |
}; | |
})(); | |
Confetti = class Confetti { | |
constructor() { | |
this.style = COLORS[~~range(0, 5)]; | |
this.rgb = `rgba(${this.style[0]},${this.style[1]},${this.style[2]}`; | |
this.r = ~~range(2, 6); | |
this.r2 = 2 * this.r; | |
this.replace(); | |
} | |
replace() { | |
this.opacity = 0; | |
this.dop = 0.03 * range(1, 4); | |
this.x = range(-this.r2, w - this.r2); | |
this.y = range(-20, h - this.r2); | |
this.xmax = w - this.r; | |
this.ymax = h - this.r; | |
this.vx = range(0, 2) + 8 * xpos - 5; | |
return this.vy = 0.7 * this.r + range(-1, 1); | |
} | |
draw() { | |
var ref; | |
this.x += this.vx; | |
this.y += this.vy; | |
this.opacity += this.dop; | |
if (this.opacity > 1) { | |
this.opacity = 1; | |
this.dop *= -1; | |
} | |
if (this.opacity < 0 || this.y > this.ymax) { | |
this.replace(); | |
} | |
if (!((0 < (ref = this.x) && ref < this.xmax))) { | |
this.x = (this.x + this.xmax) % this.xmax; | |
} | |
return drawCircle(~~this.x, ~~this.y, this.r, `${this.rgb},${this.opacity})`); | |
} | |
}; | |
confetti = (function() { | |
var j, ref, results; | |
results = []; | |
for (i = j = 1, ref = NUM_CONFETTI; 1 <= ref ? j <= ref : j >= ref; i = 1 <= ref ? ++j : --j) { | |
results.push(new Confetti); | |
} | |
return results; | |
})(); | |
window.step = function() { | |
var c, j, len, results; | |
requestAnimationFrame(step); | |
context.clearRect(0, 0, w, h); | |
results = []; | |
for (j = 0, len = confetti.length; j < len; j++) { | |
c = confetti[j]; | |
results.push(c.draw()); | |
} | |
return results; | |
}; | |
step(); | |
}).call(this); |
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