Created
October 27, 2010 12:07
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HTML5 canvas example with Sierpiński
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| <!DOCTYPE HTML> | |
| <html> | |
| <head> | |
| <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> | |
| <title>canvas hello world</title> | |
| <style> | |
| canvas { | |
| margin: 0 auto; | |
| display: block; | |
| padding: 1px; | |
| } | |
| canvas:hover { | |
| border: 1px solid #eee; | |
| padding: 0; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <canvas id="canvas" style="border: 1px solid;" width="500" height="500"> | |
| Update your browser please. | |
| </canvas> | |
| <script> | |
| var dblRc=1.732; | |
| var iHt; | |
| function main() { | |
| var context = document.getElementById('canvas').getContext('2d'); | |
| drawTriangle(250, 100, 200, context, 4); | |
| } | |
| function drawTriangle(ix, iy, ilg, context, step) { | |
| //console.log(ilg); | |
| if (step > 0) { | |
| iHt = (ilg * (dblRc/2)) ; | |
| var tmp1 = ix-(ilg/2); | |
| var tmp2 = ix+(ilg/2); | |
| var tmp3 = iy+iHt; | |
| context.beginPath(); | |
| context.moveTo(ix, iy); | |
| context.lineTo(tmp1, tmp3); | |
| context.moveTo(tmp1, tmp3); | |
| context.lineTo(tmp2, tmp3); | |
| context.moveTo(ix, iy); | |
| context.lineTo(tmp2, tmp3); | |
| context.stroke(); | |
| context.closePath(); | |
| drawTriangle(ix, iy+iHt, ilg/2, context, step - 1); // bottom triangle | |
| drawTriangle(ix-ilg/2, iy, ilg/2, context, step - 1); // left triangle | |
| drawTriangle(ix+ilg/2, iy, ilg/2, context, step - 1); // right triangle | |
| } | |
| } | |
| window.addEventListener("load", main, true); | |
| </script> | |
| </body> | |
| </html> |
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