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<html>
<head>
<script type="text/javascript">
window.onload = draw;
function draw(){
var canvas = document.getElementById('myCanvas');
if (canvas.getContext){
var context = canvas.getContext('2d');
drawFractalTree(context);
}
else{
alert("HTML5 Canvas isn't supported by your browser!");
}
}
function drawFractalTree(context){
drawTree(context, 800, 800, -90, 11);
}
function drawTree(context, x1, y1, angle, depth){
var BRANCH_LENGTH = random(0, 20);
if (depth != 0){
var x2 = x1 + (cos(angle) * depth * BRANCH_LENGTH);
var y2 = y1 + (sin(angle) * depth * BRANCH_LENGTH);
drawLine(context, x1, y1, x2, y2, depth);
drawTree(context, x2, y2, angle - random(15,20), depth - 1);
drawTree(context, x2, y2, angle + random(15,20), depth - 1);
}
}
function drawLine(context, x1, y1, x2, y2, thickness){
context.fillStyle = '#000';
if(thickness > 6)
context.strokeStyle = 'rgb(139,126, 102)'; //Brown
else
context.strokeStyle = 'rgb(34,139,34)'; //Green
context.lineWidth = thickness * 1.5;
context.beginPath();
context.moveTo(x1,y1);
context.lineTo(x2, y2);
context.closePath();
context.stroke();
}
function cos (angle) {
return Math.cos(deg_to_rad(angle));
}
function sin (angle) {
return Math.sin(deg_to_rad(angle));
}
function deg_to_rad(angle){
return angle*(Math.PI/180.0);
}
function random(min, max){
return min + Math.floor(Math.random()*(max+1-min));
}
</script>
<style type="text/css">
canvas { border: 1px solid white; }
</style>
</head>
<body>
<canvas id="myCanvas" width="1500" height="800"></canvas>
</body>
</html>
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