Created
April 8, 2014 23:03
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sierpinski triangles
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| <html> | |
| <head> | |
| <title>Sierpinski triangles in Liquidscript</title> | |
| <script src="triangle.js"></script> | |
| </head> | |
| <body onload="sierpinski(100)"> | |
| <canvas id="result" width="800" height="800"></canvas> | |
| </body> | |
| </html> |
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| #! allow Math Array document | |
| class Triangle { | |
| initialize: (canvas) -> | |
| this.canvas = canvas | |
| init: ()-> { | |
| ctx = this.canvas.getContext('2d') | |
| this.canvas.width = this.canvas.width # Clear the canvas | |
| ctx.strokeStyle = "#000" | |
| return ctx | |
| } | |
| height: -> | |
| return this.data.length | |
| scale: (ctx, height) -> { | |
| scale = this.canvas.width / 2 / height | |
| ctx.scale(scale, scale) | |
| return scale | |
| } | |
| generate: (height) -> { | |
| this.data = new Array() | |
| this.data.push([1]) | |
| this.data.push(new Array(1, 1)) | |
| for(i = 2, i < height, i++) { | |
| cRow = [1] | |
| for(j = 0, j < (this.data[i - 1].length - 1), j++){ | |
| l=this.data[i - 1][j] | |
| r=this.data[i - 1][j + 1] | |
| cRow.push((l + r) % 2) | |
| } | |
| cRow.push(1) | |
| this.data.push(cRow) | |
| } | |
| } | |
| draw: -> { | |
| h = this.height() | |
| ctx = this.init() | |
| scale = this.scale(ctx, h) | |
| for(y = 0, y < h, y++){ | |
| for(x = 0, x < this.data[y].length, x++){ | |
| if (0 != this.data[y][x]) { | |
| ctx.beginPath() | |
| ctx.arc(h - this.data[y].length + x * 2 + 1, y * 2 + 1, 1, 0, Math.PI * 2) | |
| ctx.fill() | |
| } | |
| } | |
| } | |
| } | |
| } | |
| sierpinski = (h) -> { | |
| triangle = new Triangle(document.getElementById("result")) | |
| triangle.generate(h) | |
| triangle.draw() | |
| } |
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