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<!DOCTYPE HTML> | |
<html> | |
<head> | |
<style> | |
body { | |
margin: 0px; | |
padding: 0px; | |
} | |
</style> | |
</head> | |
<body> | |
<canvas id="myCanvas" width="1200" height="1000"></canvas> | |
<script> | |
function Point(x, y) { | |
this.X = x; | |
this.Y = y; | |
} | |
var canvas = document.getElementById('myCanvas'); | |
var context = canvas.getContext('2d'); | |
var alpha = Math.PI * 0.275, | |
beta = -Math.PI * 0.35, | |
ratioA = 0.775, | |
ratioB = 0.45, | |
MIN_LENGTH = 5; | |
function drawLine(rootPoint, r, theta) { | |
context.beginPath(); | |
var endX = rootPoint.X + r*Math.cos(theta); | |
var endY = rootPoint.Y + r*Math.sin(theta); | |
var endPoint = new Point(endX, endY); | |
context.moveTo(rootPoint.X, rootPoint.Y); | |
context.lineTo(endPoint.X, endPoint.Y); | |
context.stroke(); | |
if (r*ratioA < MIN_LENGTH || r*ratioB < MIN_LENGTH) { | |
return; | |
} | |
drawLine(endPoint, r*ratioA, theta+alpha); | |
drawLine(endPoint, r*ratioB, theta+beta); | |
} | |
var startPoint = new Point(300, 500); | |
drawLine(startPoint, 200, Math.PI * 3/2); | |
</script> | |
</body> | |
</html> |
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