Created
September 21, 2011 20:43
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HTML5 Canvas Line Graph
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset=utf-8 /> | |
| <title>Roulette</title> | |
| <!--[if IE]> | |
| <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script> | |
| <![endif]--> | |
| <style> | |
| article, aside, figure, footer, header, hgroup, | |
| menu, nav, section { display: block; } | |
| </style> | |
| </head> | |
| <body> | |
| <canvas id="c" width="500" height="375"></canvas> | |
| <script src="graph.js"></script> | |
| </body> | |
| </html> |
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| if (document.getElementById('c')) { | |
| // context | |
| var c_canvas = document.getElementById("c"); | |
| var context = c_canvas.getContext("2d"); | |
| // grid | |
| for (var x = 0.5; x < 500; x += 10) { | |
| context.moveTo(x, 0); | |
| context.lineTo(x, 375); | |
| } | |
| for (var y = 0.5; y < 375; y += 10) { | |
| context.moveTo(0, y); | |
| context.lineTo(500, y); | |
| } | |
| context.strokeStyle = "#eee"; | |
| context.stroke(); | |
| // axis | |
| context.beginPath(); | |
| context.moveTo(0, 375 / 2); | |
| context.lineTo(500, 375 / 2); | |
| context.moveTo(60, 0); | |
| context.lineTo(60, 27); | |
| context.moveTo(60, 47); | |
| context.lineTo(60, 375); | |
| context.strokeStyle = "#000"; | |
| context.stroke(); | |
| // text | |
| context.font = "bold 12px sans-serif"; | |
| context.fillText("plays", 248, 42); | |
| context.fillText("winnings", 28, 42); | |
| // graphing functons | |
| var rouletteRed = (function() { | |
| var winnings = 0; | |
| return function() { | |
| winnings += Math.random() < 18/38 ? 1 : -1; | |
| return winnings; | |
| }; | |
| })(); | |
| var roulette17 = (function() { | |
| var winnings = 0; | |
| return function() { | |
| winnings += Math.random() < 1/38 ? 35 : -1; | |
| return winnings; | |
| }; | |
| })(); | |
| var lineGraph = function(o) { | |
| context.beginPath(); | |
| context.moveTo(60, 375 / 2); | |
| for(var i = 61; i < 500; i += 1) { | |
| context.lineTo(i, -o.stepFunction() + 375 / 2); | |
| } | |
| context.strokeStyle = o.color; | |
| context.stroke(); | |
| }; | |
| lineGraph({ | |
| 'stepFunction': rouletteRed, | |
| 'color': '#e00' | |
| }); | |
| lineGraph({ | |
| 'stepFunction': roulette17, | |
| 'color': '#00e' | |
| }); | |
| } |
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