Created
August 4, 2016 02:00
-
-
Save anonymous/486f514a237dc2994cccfc8c2d48ebc8 to your computer and use it in GitHub Desktop.
JS Bin Coding Challenge #30: Phyllotaxis // source http://jsbin.com/hezidi
This file contains 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
| <!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> |
This file contains 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
| canvas { | |
| border: black 1px solid; | |
| } |
This file contains 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(); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment