Circles on circles: Difference between revisions

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This is an example of a parametric curve plot. The curve is described by the function
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> [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>
:<math> [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 http://jqueryui.com]. This example shows the seamless integration of JSXGraph into the web page.
The sliders to adjust the parameters of this curve are from the jQuery UI package, see [http://jqueryui.com http://jqueryui.com]. This example shows the seamless integration of JSXGraph into the web page.


<html>
<html>
<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"/>
<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.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/jquery-ui.min.js"></script>
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraphcore.js"></script>


<style type="text/css">
<style type="text/css">
Line 20: Line 18:
$("#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 27:
$("#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 39:
$("#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 48:
$("#f2").val(ui.value);
$("#f2").val(ui.value);
                                 f2 = ui.value;
                                 f2 = ui.value;
                                board.updateQuality = board.BOARD_QUALITY_HIGH;
                                 board.update();
                                 board.update();
}
}
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   <div id="sliderf2" style="width:300px;margin:10px;"></div>
   <div id="sliderf2" style="width:300px;margin:10px;"></div>
</div>
</div>
<div id="jsxgbox" class="jxgbox" style="width:500px; height:500px;"></div>
</html>
<script language="JavaScript">
<jsxgraph width="500" height="500" box="jxgbox">
board = JXG.JSXGraph.initBoard('jsxgbox', {originX: 250, originY: 250, unitX: 100, unitY: 100});
board = JXG.JSXGraph.initBoard('jxgbox', {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.create('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});
</jsxgraph>
 
'''Variation:'''
* [[Circles on circles rotating in opposite directions]]
 
===External references===
Epicycloidal curves have been used by the ancient greeks to describe the orbits of the planets, see
* [http://arxiv.org/abs/chao-dyn/9907004 Giovanni Gallavotti: Quasi periodic motions from Hipparchus to Kolmogorov]
* [http://www.swisseduc.ch/mathematik/schwingungen/docs/kapitel3.pdf http://www.swisseduc.ch/mathematik/schwingungen/docs/kapitel3.pdf] for a detailed explanation in German (from [http://www.swisseduc.ch/mathematik/schwingungen/ http://www.swisseduc.ch/mathematik/schwingungen/]).
 
More on epicycloidal curves:
* [[Hypotrochoid]]
* [http://www.uni-graz.at/~fripert/kreise/index.html Experiments by Harald Fripertinger]
* [http://en.wikipedia.org/wiki/Epicycloid http://en.wikipedia.org/wiki/Epicycloid]
* [http://mathworld.wolfram.com/Epicycloid.html http://mathworld.wolfram.com/Epicycloid.html]
 
===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>c1, c2, f1, f2</math>.
<source lang="html4strict">
<html>
<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>
 
<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.updateQuality = board.BOARD_QUALITY_HIGH;
                                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.updateQuality = board.BOARD_QUALITY_HIGH;
                                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.updateQuality = board.BOARD_QUALITY_HIGH;
                                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.updateQuality = board.BOARD_QUALITY_HIGH;
                                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>
</html>
<jsxgraph width="500" height="500" box="jxgbox">
board = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-2.5,2.5,2.5,-2.5], keepaspectratio:true});
var c1 = 0.6;
var c1 = 0.6;
var c2 = 0.0;  
var c2 = 0.0;  
var f1 = 7;  
var f1 = 7;  
var f2 = 17;
var f2 = 17;
var c = board.createElement('curve', [
var c = board.create('curve', [
               function(t) { return Math.cos(t)+ c1*Math.cos(f1*t)+ c2*Math.cos(f2*t);},
               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);},
               function(t) { return Math.sin(t)+ c1*Math.sin(f1*t)+ c2*Math.sin(f2*t);},
               0,2.2*Math.PI]);
               0,2.02*Math.PI],{strokeWidth:2});
</script>
</jsxgraph>
</html>
</source>
 
[[Category:Examples]]
[[Category:Examples]]
[[Category:Curves]]
[[Category:Curves]]

Revision as of 11:40, 14 September 2015

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].

<html>
<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>

<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.updateQuality = board.BOARD_QUALITY_HIGH;
                                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.updateQuality = board.BOARD_QUALITY_HIGH;
                                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.updateQuality = board.BOARD_QUALITY_HIGH;
                                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.updateQuality = board.BOARD_QUALITY_HIGH;
                                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>
</html>
<jsxgraph width="500" height="500" box="jxgbox">
board = JXG.JSXGraph.initBoard('jxgbox', {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.create('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});
</jsxgraph>