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75 lines
2.3 KiB
75 lines
2.3 KiB
<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" > |
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<head> |
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<title>Pi calculation</title> |
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> |
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<style type="text/css"> |
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@import "../../../dojo/resources/dojo.css"; |
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@import "../../../dijit/tests/css/dijitTests.css"; |
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</style> |
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<script type="text/javascript" src="../../../dojo/dojo.js" data-dojo-config="isDebug: true"></script> |
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<script type="text/javascript"> |
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dojo.require("dojox.gfx"); |
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var iterations = 0, inCounter = 0, totalCounter = 0, |
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interval, surface; |
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var compute = function(){ |
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var x = Math.random(); |
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var y = Math.random(); |
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var pointX = Math.round(x * 300); |
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var pointY = Math.round(y * 300); |
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var pointColor = "red"; |
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if(x*x + y*y < 1){ |
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inCounter++; |
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pointColor = "green"; |
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} |
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surface.createCircle({cx: pointX, cy: pointY, r: 3}). |
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setFill(pointColor).setStroke({color: pointColor, width: 2}); |
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totalCounter++; |
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if(totalCounter % 100 == 0 || totalCounter == iterations){ |
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var PI = parseFloat(inCounter / totalCounter) * 4; |
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var error = (PI - Math.PI) / Math.PI * 100; // in % |
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dojo.byId("result").innerHTML = PI + " (error = " + error.toFixed(2) + |
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"%) after " + totalCounter + " points"; |
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} |
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if(totalCounter == iterations){ |
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clearInterval(interval); |
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dojo.byId("startButton").disabled = false; |
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} |
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}; |
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var go = function(){ |
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dojo.byId("startButton").disabled = true; |
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dojo.byId("result").innerHTML = " "; |
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inCounter = totalCounter = 0; |
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iterations = parseInt(0 + parseInt(dojo.byId("iterations").value), 10); |
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interval = setInterval(compute, 20); |
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}; |
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var init = function(){ |
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surface = dojox.gfx.createSurface("test", 300, 300); |
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dojo.connect(dojo.byId("startButton"), "onclick", this, go); |
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}; |
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dojo.addOnLoad(init); |
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</script> |
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</head> |
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<body> |
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<h1>PI demo</h1> |
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<p>Visualization of calculating PI using the Monte Carlo method.</p> |
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<p> |
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<label>Iterations:</label> <input type="text" name="iterations" value="500" id="iterations"/> |
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<input type="button" name="start" value="start" id="startButton" /> |
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</p> |
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<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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<p>Estimated value for PI: <span id="result" style="font-weight: bold"></span></p> |
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<div id="test" style="width: 300px; height: 300px;border:1px solid black"></div> |
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<p>That's all Folks!</p> |
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</body> |
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</html>
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