| 1 | <html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" > |
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| 2 | <head> |
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| 3 | <title>Pi calculation</title> |
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| 4 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> |
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| 5 | <style type="text/css"> |
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| 6 | @import "../../../dojo/resources/dojo.css"; |
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| 7 | @import "../../../dijit/tests/css/dijitTests.css"; |
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| 8 | </style> |
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| 9 | <script type="text/javascript" src="../../../dojo/dojo.js" djConfig="isDebug: true"></script> |
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| 10 | <script type="text/javascript"> |
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| 11 | dojo.require("dojox.gfx"); |
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| 12 | |
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| 13 | var iterations = 0, inCounter = 0, totalCounter = 0, |
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| 14 | interval, surface; |
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| 15 | |
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| 16 | var compute = function(){ |
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| 17 | var x = Math.random(); |
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| 18 | var y = Math.random(); |
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| 19 | var pointX = Math.round(x * 300); |
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| 20 | var pointY = Math.round(y * 300); |
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| 21 | |
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| 22 | var pointColor = "red"; |
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| 23 | if(x*x + y*y < 1){ |
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| 24 | inCounter++; |
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| 25 | pointColor = "green"; |
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| 26 | } |
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| 27 | |
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| 28 | surface.createCircle({cx: pointX, cy: pointY, r: 3}). |
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| 29 | setFill(pointColor).setStroke({color: pointColor, width: 2}); |
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| 30 | |
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| 31 | totalCounter++; |
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| 32 | |
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| 33 | if(totalCounter % 100 == 0 || totalCounter == iterations){ |
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| 34 | var PI = parseFloat(inCounter / totalCounter) * 4; |
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| 35 | var error = (PI - Math.PI) / Math.PI * 100; // in % |
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| 36 | dojo.byId("result").innerHTML = PI + " (error = " + error.toFixed(2) + |
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| 37 | "%) after " + totalCounter + " points"; |
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| 38 | } |
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| 39 | |
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| 40 | if(totalCounter == iterations){ |
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| 41 | clearInterval(interval); |
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| 42 | dojo.byId("startButton").disabled = false; |
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| 43 | } |
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| 44 | }; |
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| 45 | |
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| 46 | var go = function(){ |
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| 47 | dojo.byId("startButton").disabled = true; |
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| 48 | dojo.byId("result").innerHTML = " "; |
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| 49 | inCounter = totalCounter = 0; |
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| 50 | iterations = parseInt(0 + parseInt(dojo.byId("iterations").value), 10); |
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| 51 | interval = setInterval(compute, 20); |
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| 52 | }; |
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| 53 | |
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| 54 | var init = function(){ |
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| 55 | surface = dojox.gfx.createSurface("test", 300, 300); |
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| 56 | dojo.connect(dojo.byId("startButton"), "onclick", this, go); |
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| 57 | }; |
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| 58 | |
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| 59 | dojo.addOnLoad(init); |
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| 60 | |
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| 61 | </script> |
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| 62 | </head> |
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| 63 | <body> |
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| 64 | <h1>PI demo</h1> |
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| 65 | <p>Visualization of calculating PI using the Monte Carlo method.</p> |
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| 66 | <p> |
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| 67 | <label>Iterations:</label> <input type="text" name="iterations" value="500" id="iterations"/> |
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| 68 | <input type="button" name="start" value="start" id="startButton" /> |
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| 69 | </p> |
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| 70 | <p><span style="color:green">Green</span>: x^2 + y^2 <= 1, <span style="color:red">Red</span>: x^2 + y^2 > 1</p> |
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| 71 | <p>Estimated value for PI: <span id="result" style="font-weight: bold"></span></p> |
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| 72 | <div id="test" style="width: 300px; height: 300px;border:1px solid black"></div> |
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| 73 | <p>That's all Folks!</p> |
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| 74 | </body> |
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| 75 | </html> |
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