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JS Bin Coding Challenge #30: Phyllotaxis // source http://jsbin.com/hezidi
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta name="description" content="Coding Challenge #30: Phyllotaxis"> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>JS Bin</title> | |
| <style id="jsbin-css"> | |
| canvas { | |
| border: black 1px solid; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <canvas></canvas> | |
| <script id="jsbin-javascript"> | |
| "use strict"; | |
| var canvas = document.getElementsByTagName("canvas")[0]; | |
| canvas.width = 500; | |
| canvas.height = 500; | |
| var ctx = canvas.getContext("2d"); | |
| var sqrt = Math.sqrt; | |
| var cos = Math.cos; | |
| var sin = Math.sin; | |
| var c = 5; | |
| var n = 0; | |
| function draw() { | |
| var a = n * 137.5; | |
| var r = c * sqrt(n); | |
| var x = r * cos(a) + canvas.width / 2; | |
| var y = r * sin(a) + canvas.height / 2; | |
| ctx.beginPath(); | |
| ctx.ellipse(x, y, 4, 4, 0, 0, 2 * Math.PI); | |
| ctx.fillStyle = "blue"; | |
| ctx.fill(); | |
| n++; | |
| if (n > 500) { | |
| ctx.clearRect(0, 0, canvas.width, canvas.height); | |
| n = 0; | |
| } | |
| requestAnimationFrame(draw); | |
| } | |
| draw(); | |
| </script> | |
| <script id="jsbin-source-css" type="text/css">canvas { | |
| border: black 1px solid; | |
| }</script> | |
| <script id="jsbin-source-javascript" type="text/javascript">const canvas = document.getElementsByTagName("canvas")[0]; | |
| canvas.width = 500; | |
| canvas.height = 500; | |
| const ctx = canvas.getContext("2d"); | |
| const { sqrt, cos, sin } = Math; | |
| const c = 5; | |
| let n = 0; | |
| function draw(){ | |
| const a = n * 137.5; | |
| const r = c * sqrt(n); | |
| const x = r * cos(a) + canvas.width / 2; | |
| const y = r * sin(a) + canvas.height / 2; | |
| ctx.beginPath(); | |
| ctx.ellipse(x, y, 4, 4, 0, 0, 2 * Math.PI); | |
| ctx.fillStyle = "blue"; | |
| ctx.fill(); | |
| n++; | |
| if(n > 500){ | |
| ctx.clearRect(0, 0, canvas.width, canvas.height) | |
| n = 0; | |
| } | |
| requestAnimationFrame(draw); | |
| } | |
| draw() | |
| </script></body> | |
| </html> |
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| canvas { | |
| border: black 1px solid; | |
| } |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| "use strict"; | |
| var canvas = document.getElementsByTagName("canvas")[0]; | |
| canvas.width = 500; | |
| canvas.height = 500; | |
| var ctx = canvas.getContext("2d"); | |
| var sqrt = Math.sqrt; | |
| var cos = Math.cos; | |
| var sin = Math.sin; | |
| var c = 5; | |
| var n = 0; | |
| function draw() { | |
| var a = n * 137.5; | |
| var r = c * sqrt(n); | |
| var x = r * cos(a) + canvas.width / 2; | |
| var y = r * sin(a) + canvas.height / 2; | |
| ctx.beginPath(); | |
| ctx.ellipse(x, y, 4, 4, 0, 0, 2 * Math.PI); | |
| ctx.fillStyle = "blue"; | |
| ctx.fill(); | |
| n++; | |
| if (n > 500) { | |
| ctx.clearRect(0, 0, canvas.width, canvas.height); | |
| n = 0; | |
| } | |
| requestAnimationFrame(draw); | |
| } | |
| draw(); |
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