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canvas.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Canvas</title>
<style>
body {
background-color: black;
}
.frame {
display: inline-block;
padding: 0;
border-radius: 3px;
font-size: 7em;
text-shadow: 1px 2px white;
color: green;
text-align: center;
}
.frame canvas {
display: block;
padding: 60px 0px 0px 0px;
background-color: black;
}
#tree {
display: block;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
}
</style>
</head>
<body>
<div class='frame'>
<canvas id='tree'></canvas>
</div>
<script>
(function () {
var SwirlNode, Tree, TreeSwirl, height, swirls, width,
__bind = function (fn, me) { return function () { return fn.apply(me, arguments); }; };
width = 600;
height = 450;
swirls = [
{
color: 'gold',
nodes: 300,
speed: -1,
radius: 3
}, {
color: 'green',
nodes: 200,
speed: 1,
radius: 1.5
}, {
color: 'blue',
nodes: 80,
speed: -3,
radius: 6
}, {
color: 'green',
nodes: 250,
speed: 3,
radius: 3
}
];
Tree = (function () {
function Tree(w, h, swirls) {
this.run = __bind(this.run, this);
var i;
this.width = w;
this.height = h;
this.canvas = document.getElementById('tree');
this.context = this.canvas.getContext('2d');
this.canvas.width = w;
this.canvas.height = h;
this.swirls = (function () {
var _i, _ref, _results;
_results = [];
for (i = _i = 0, _ref = swirls.length; 0 <= _ref ? _i < _ref : _i > _ref; i = 0 <= _ref ? ++_i : --_i) {
_results.push(new TreeSwirl(this, swirls[i], i / swirls.length));
}
return _results;
}).call(this);
this.run();
}
Tree.prototype.run = function (t) {
if (t == null) {
t = 0;
}
window.requestAnimationFrame(this.run);
return this.draw(t);
};
Tree.prototype.draw = function (t) {
var s, _i, _j, _len, _len1, _ref, _ref1, _results;
this.context.clearRect(0, 0, this.width, this.height);
_ref = this.swirls;
for (_i = 0, _len = _ref.length; _i < _len; _i++) {
s = _ref[_i];
s.drawBack(t);
}
_ref1 = this.swirls;
_results = [];
for (_j = 0, _len1 = _ref1.length; _j < _len1; _j++) {
s = _ref1[_j];
_results.push(s.drawFront(t));
}
return _results;
};
return Tree;
})();
TreeSwirl = (function () {
function TreeSwirl(tree, s, offset) {
var i;
this.tree = tree;
this.offset = offset;
this.color = s.color;
this.speed = s.speed;
this.radius = s.radius;
this.nodes = (function () {
var _i, _ref, _results;
_results = [];
for (i = _i = 0, _ref = s.nodes; 0 <= _ref ? _i < _ref : _i > _ref; i = 0 <= _ref ? ++_i : --_i) {
_results.push(new SwirlNode(this, i / s.nodes));
}
return _results;
}).call(this);
}
TreeSwirl.prototype.drawBack = function (t) {
var n, _i, _len, _ref, _results;
_ref = this.nodes;
_results = [];
for (_i = 0, _len = _ref.length; _i < _len; _i++) {
n = _ref[_i];
if (n.inBack(t)) {
_results.push(n.draw(t));
}
}
return _results;
};
TreeSwirl.prototype.drawFront = function (t) {
var n, _i, _len, _ref, _results;
_ref = this.nodes;
_results = [];
for (_i = 0, _len = _ref.length; _i < _len; _i++) {
n = _ref[_i];
if (n.inFront(t)) {
_results.push(n.draw(t));
}
}
return _results;
};
return TreeSwirl;
})();
SwirlNode = (function () {
function SwirlNode(swirl, offset) {
this.swirl = swirl;
this.offset = offset;
}
SwirlNode.prototype.yPos = function () {
var d, od;
d = this.t / 800 * this.swirl.speed;
od = d + this.offset * this.swirl.tree.height;
return (this.swirl.tree.height - od % this.swirl.tree.height) % this.swirl.tree.height;
};
SwirlNode.prototype.xDeg = function () {
return this.yPos() * 5 + 100 * this.swirl.offset;
};
SwirlNode.prototype.xRad = function () {
return this.xDeg() * Math.PI / 60;
};
SwirlNode.prototype.xPos = function () {
return Math.sin(this.xRad()) * this.swirl.tree.width * this.yPos() / this.swirl.tree.height / 3 + this.swirl.tree.width / 2;
};
SwirlNode.prototype.shade = function () {
return (Math.cos(this.xRad()) + 1) / 2;
};
SwirlNode.prototype.inBack = function (t) {
this.t = t;
return Math.cos(this.xRad()) > 0;
};
SwirlNode.prototype.inFront = function (t) {
this.t = t;
return !this.inBack(t);
};
SwirlNode.prototype.draw = function (t) {
this.t = t - 600;
this.drawNode(this.swirl.radius * 0.6, this.shade() + 0.9);
this.t = t - 180;
this.drawNode(this.swirl.radius * 0.8, this.shade() + 0.4);
this.t = t;
return this.drawNode(this.swirl.radius, this.shade());
};
SwirlNode.prototype.drawNode = function (size, shade) {
var c;
c = this.swirl.tree.context;
c.beginPath();
c.arc(this.xPos(), this.yPos(), size, 0, 2 * Math.PI);
c.fillStyle = this.swirl.color;
c.fill();
c.fillStyle = "rgba(0,0,0," + shade + ")";
return c.fill();
};
return SwirlNode;
})();
new Tree(width, height, swirls);
}).call(this);
</script>
</body>
</html>