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