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School of meiamsome #1
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Swirl</title> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.5.6/p5.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.5.6/addons/p5.dom.js"></script> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| var siz = 600; | |
| var nSlider; | |
| var n, r, angle; | |
| var theta, alpha; | |
| var delta = 0.1; | |
| function setup() { | |
| createCanvas(siz, siz); | |
| nSlider = createSlider(3, 11, 5); | |
| nSlider.changed(reset); | |
| noFill(); | |
| colorMode(HSB); | |
| reset(); | |
| } | |
| function draw() { | |
| stroke((angle * 100) % 360, 255, 255); | |
| polygon(n, r, angle); | |
| r *= Math.sin(theta / 2) / Math.sin(alpha); | |
| angle += delta; | |
| } | |
| function reset() { | |
| background(0); | |
| n = nSlider.value(); | |
| r = siz * 0.48; | |
| angle = 0; | |
| theta = (n - 2) * PI / n; | |
| alpha = PI - theta / 2 - delta; | |
| } | |
| function polygon(ngon, radius, offset) { | |
| push(); | |
| translate(siz/2, siz/2); | |
| beginShape(); | |
| for (var i = 0; i < ngon; i++) { | |
| var x = radius * Math.cos(i * TWO_PI / ngon + offset); | |
| var y = radius * Math.sin(i * TWO_PI / ngon + offset); | |
| vertex(x, y); | |
| } | |
| endShape(CLOSE); | |
| pop(); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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