Circles on circles: Difference between revisions

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Line 20: Line 20:
$("#c1").val(ui.value*0.01);
$("#c1").val(ui.value*0.01);
                                 c1 = ui.value*0.01;
                                 c1 = ui.value*0.01;
                                board.updateQuality = board.BOARD_QUALITY_HIGH;
                                 board.update();
                                 board.update();
}
}
Line 28: Line 29:
$("#f1").val(ui.value);
$("#f1").val(ui.value);
                                 f1 = ui.value;
                                 f1 = ui.value;
                                board.updateQuality = board.BOARD_QUALITY_HIGH;
                                 board.update();
                                 board.update();
}
}
Line 39: Line 41:
$("#c2").val(ui.value*0.01);
$("#c2").val(ui.value*0.01);
                                 c2 = ui.value*0.01;
                                 c2 = ui.value*0.01;
                                board.updateQuality = board.BOARD_QUALITY_HIGH;
                                 board.update();
                                 board.update();
}
}
Line 47: Line 50:
$("#f2").val(ui.value);
$("#f2").val(ui.value);
                                 f2 = ui.value;
                                 f2 = ui.value;
                                board.updateQuality = board.BOARD_QUALITY_HIGH;
                                 board.update();
                                 board.update();
}
}

Revision as of 16:46, 17 September 2009

This is an example of a parametric curve plot. It shows the orbit of a point on a circle. The circle rotates on a circle which again rotates on the unit circle. The resulting curve is described by the function

[math]\displaystyle{ [0,2\pi]\to{\mathbf R}^2, \quad t\mapsto {\cos(t)\choose \sin(t)}+c_1{\cos(f_1t)\choose \sin(f_1t)}+c_2{\cos(f_2t)\choose \sin(f_2t)} }[/math]

The sliders to adjust the parameters of this curve are from the jQuery UI package, see http://jqueryui.com. This example shows the seamless integration of JSXGraph into the web page.

Variation:

External references

Epicycloidal curves have been used by the ancient greeks to describe the orbits of the planets, see

More on epicycloidal curves:

The source code of this construction

This is the first experiment with the jQuery UI package. So, the code may not be optimized, yet. The main difficulty is to read the values of the sliders. This is done via four JavaScript variables [math]\displaystyle{ c1, c2, f1, f2 }[/math].

<link rel="stylesheet" type="text/css" href="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraph.css" />
<link rel="Stylesheet" type="text/css" href="http://jsxgraph.uni-bayreuth.de/distrib/css/ui-lightness/jquery-ui-1.7.2.custom.css"/>
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/jquery.min.js"></script>
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/jquery-ui.min.js"></script>
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraphcore.js"></script>

<style type="text/css">
		#slider-frame > div.sliders { padding: 10px !important; };
	</style>
	<script type="text/javascript">
	$(function() {
		$("#sliderc1").slider({
			orientation: "horizontal",range: "min",min: 0,max: 100,value: 60,
			slide: function(event, ui) {
				$("#c1").val(ui.value*0.01);
                                c1 = ui.value*0.01;
                                board.update();
			}
		});
		$("#sliderf1").slider({
			orientation: "horizontal",range: "min",min: 1,max: 100,value: 7,
			slide: function(event, ui) {
				$("#f1").val(ui.value);
                                f1 = ui.value;
                                board.update();
			}
		});
		$("#c1").val($("#sliderc1").slider("value")*0.01);
		$("#f1").val($("#sliderf1").slider("value"));

		$("#sliderc2").slider({
			orientation: "horizontal",range: "min",min: 0,max: 100,value: 0,
			slide: function(event, ui) {
				$("#c2").val(ui.value*0.01);
                                c2 = ui.value*0.01;
                                board.update();
			}
		});
		$("#sliderf2").slider({
			orientation: "horizontal",range: "min",min: 1,max: 100,value: 17,
			slide: function(event, ui) {
				$("#f2").val(ui.value);
                                f2 = ui.value;
                                board.update();
			}
		});
		$("#c2").val($("#sliderc2").slider("value")*0.01);
		$("#f2").val($("#sliderf2").slider("value"));
	});
	</script>

<div class="sliders" style="margin:5px">
  <p>
    <label for="c1">c1:</label>
    <input type="text" id="c1" style="border:0; color:#f6931f; font-weight:bold;" />
    <label for="f1">f1:</label>
    <input type="text" id="f1" style="border:0; color:#f6931f; font-weight:bold;" />
    <label for="c2">c2:</label>
    <input type="text" id="c2" style="border:0; color:#f6931f; font-weight:bold;" />
    <label for="f2">f2:</label>
    <input type="text" id="f2" style="border:0; color:#f6931f; font-weight:bold;" />
  </p>
  <div id="sliderc1" style="width:300px;margin:10px;"></div>
  <div id="sliderf1" style="width:300px;margin:10px;"></div>
  <div id="sliderc2" style="width:300px;margin:10px;"></div>
  <div id="sliderf2" style="width:300px;margin:10px;"></div>
</div>
<div id="jsxgbox" class="jxgbox" style="width:500px; height:500px;"></div>
<script language="JavaScript"> 			
board = JXG.JSXGraph.initBoard('jsxgbox', {boundingbox:[-2.5,2.5,2.5,-2.5], keepaspectratio:true});
var c1 = 0.6;
var c2 = 0.0; 
var f1 = 7; 
var f2 = 17;
var c = board.createElement('curve', [
              function(t) { return Math.cos(t)+ c1*Math.cos(f1*t)+ c2*Math.cos(f2*t);},
              function(t) { return Math.sin(t)+ c1*Math.sin(f1*t)+ c2*Math.sin(f2*t);},
              0,2.02*Math.PI],{strokeWidth:2});
</script>