Created
February 27, 2011 17:16
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graphing calculator using html5 canvas and web workers
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| var sin = Math.sin; | |
| var cos = Math.cos; | |
| var tan = Math.tan; | |
| var ln = Math.log; | |
| var log = Math.LOG10E; | |
| var pi = Math.PI; | |
| onmessage = function (event) { | |
| var n = event.data; | |
| var p = []; | |
| var a = -100*pi; | |
| var b = 100*pi; | |
| var dx = (b-a)/(pi*10000); | |
| limits = [a,b]; | |
| var i = 0; | |
| for(var x = 0; x < (b-a); x+=dx) { | |
| p[i++] = [f(x+a),g(x+a)]; | |
| } | |
| postMessage(p); | |
| } | |
| function f(x) { | |
| return (cos(x/100)+cos(x))*1000/pi/2; | |
| } | |
| function g(x) { | |
| return (sin(x/100)+sin(x))*1000/pi/2; | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <title>Worker</title> | |
| <style type="text/css"> | |
| html, body { | |
| padding: 10px; | |
| margin: 0; | |
| } | |
| </style> | |
| <body> | |
| <script type="text/javascript"> | |
| var w = new Worker('calculator.js'); | |
| var wi,hi; | |
| draw(0); | |
| function draw(n) { | |
| w.postMessage(n); | |
| /*if(n<10) { | |
| n+=1; | |
| w.postMessage(n); | |
| setTimeout("draw("+n+")",250); | |
| }*/ | |
| } | |
| w.onmessage = function (event) { | |
| var p = event.data; | |
| p[p.length] = p[p.length-1]; | |
| var canvas = document.createElement('canvas'); | |
| canvas.height = hi = window.innerHeight-50; | |
| canvas.width = wi = window.innerWidth-50; | |
| document.body.appendChild(canvas); | |
| var context = canvas.getContext('2d'); | |
| for(var i = 0; i < p.length; i++) { | |
| var p1 = transform(p[i]); | |
| var p2 = (p[i+1])?transform(p[i+1]):p1; | |
| context.moveTo(p1[0],p1[1]); | |
| context.lineTo(p2[0],p2[1]); | |
| } | |
| context.strokeStyle = "rgb(50,100,55)"; | |
| context.stroke(); | |
| context.save(); | |
| } | |
| function transform(p) { | |
| x = wi/2 + p[0]; | |
| y = hi/2 - p[1]; | |
| return [x,y]; | |
| } | |
| </script> | |
| </body> | |
| </html> |
function f(x) { return (cos(x/100+cos(x))+cos(x))*1000/pi/2; }
function g(x) { return (sin(x/100+sin(x))+cos(x))*1000/pi/2; }
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fun shape:
function f(x) { return (cos(x/100+cos(x)))*1000/pi/2; }
function g(x) { return (sin(x/100+sin(x)))*1000/pi/2; }