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| <html> | |
| <head> | |
| <title>Sierpinski triangles in Liquidscript</title> | |
| <script src="triangles.js"></script> | |
| <style>html { background-color: #f9f9f9; }</style> | |
| </head> | |
| <body onload="sierpinski(256)"> | |
| <canvas id="result" width="800" height="800"></canvas> | |
| </body> | |
| </html> |
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| #! allow Math Array document | |
| triangle-log = -> { | |
| console.log("[triangle]", arguments) | |
| } | |
| class Triangle { | |
| initialize: (canvas) -> | |
| this.canvas = canvas | |
| init: -> { | |
| ctx = this.canvas.get-context('2d) | |
| this.canvas.width = this.canvas.width # Clear the canvas | |
| ctx.fill-style = ctx.stroke-style = "#88a6cf" | |
| return ctx | |
| } | |
| height: -> | |
| return this.data.length | |
| scale: (ctx) -> { | |
| ctx.scale(0.5, 0.5) | |
| return 0.5 | |
| } | |
| generate: (height) -> { | |
| this.data = new Array() | |
| this.data.push([1]) | |
| this.data.push(new Array(1, 1)) | |
| for(i = 2, i < height, i++) { | |
| c-row = [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] | |
| c-row.push((l + r) % 2) | |
| } | |
| c-row.push(1) | |
| this.data.push(c-row) | |
| } | |
| } | |
| draw: -> { | |
| h = this.height() | |
| ctx = this.init() | |
| scale = this.scale(ctx) | |
| for(y = 0, y < h, y++) { | |
| for(x = 0, x < this.data[y].length, x++) { | |
| if (0 != this.data[y][x]) { | |
| ctx.begin-path() | |
| ctx.arc(h - this.data[y].length + x * 2 + 1, y * 2 + 1, 1, 0, Math.PI * 2) | |
| ctx.fill() | |
| ctx.close-path() | |
| } | |
| } | |
| } | |
| } | |
| } | |
| window.sierpinski = (h) -> { | |
| triangle = new Triangle(document.get-element-by-id("result")) | |
| triangle-log(h, triangle) | |
| triangle.generate(h) | |
| triangle.draw() | |
| } |
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