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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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