# Difference between revisions of "Spirograph"

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<jsxgraph width="600" height="600"> | <jsxgraph width="600" height="600"> | ||

− | var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-5,5,5,-5], | + | var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-5,5,5,-5], keepaspectratio:true}); |

var R = 2.0; | var R = 2.0; | ||

var r = brd.create('slider',[[-3,4],[3,4],[-5,1,5]],{name:'r'}); | var r = brd.create('slider',[[-3,4],[3,4],[-5,1,5]],{name:'r'}); | ||

Line 22: | Line 22: | ||

===The underlying JavaScript code=== | ===The underlying JavaScript code=== | ||

<source lang="javascript"> | <source lang="javascript"> | ||

− | var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-5,5,5,-5], | + | var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-5,5,5,-5], keepaspectratio:true}); |

var R = 2.0; | var R = 2.0; | ||

var r = brd.create('slider',[[-3,4],[3,4],[-5,1,5]],{name:'r'}); | var r = brd.create('slider',[[-3,4],[3,4],[-5,1,5]],{name:'r'}); |

## Latest revision as of 21:39, 19 July 2010

### The underlying JavaScript code

```
var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-5,5,5,-5], keepaspectratio:true});
var R = 2.0;
var r = brd.create('slider',[[-3,4],[3,4],[-5,1,5]],{name:'r'});
var a = brd.create('slider',[[-3,3],[3,3],[-5,1,5]],{name:'a'});
var c = brd.create('curve',[
function(t){
var r1 = Math.round(100.0*r.Value())/100.0;
var a1 = Math.round(100.0*a.Value())/100.0;
return (R-r1)*Math.cos(r1/R*t)+a1*Math.cos((1-r1/R)*t);
},
function(t){
var r1 = Math.round(100.0*r.Value())/100.0;
var a1 = Math.round(100.0*a.Value())/100.0;
return (R-r1)*Math.sin(r1/R*t)+a1*Math.sin((1-r1/R)*t);
},
-40*Math.PI,40*Math.PI
], {strokeWidth:3, strokeColor:'#3355ff', strokeOpacity:0.7});
```