Difference between revisions of "Spirograph - geometric construction"

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Line 99: Line 99:
 
=== Fourfold speed ===
 
=== Fourfold speed ===
 
The speed of <math>C_2</math> is four times the speed of <math>B</math>.
 
The speed of <math>C_2</math> is four times the speed of <math>B</math>.
<jsxgraph width="600" height="600" box="jxgbox2">
+
<jsxgraph width="600" height="600" box="jxgbox3">
 
(function() {
 
(function() {
var brd = JXG.JSXGraph.initBoard('jxgbox2',{boundingbox:[-5,5,5,-5], keepaspectratio:true});
+
var brd = JXG.JSXGraph.initBoard('jxgbox3',{boundingbox:[-5,5,5,-5], keepaspectratio:true});
  
 
var O = brd.create('point',[0,0],{name:'O',fixed:true, fillColor:'blue', strokeColor:'blue'});
 
var O = brd.create('point',[0,0],{name:'O',fixed:true, fillColor:'blue', strokeColor:'blue'});
Line 126: Line 126:
 
<source lang="javascript">
 
<source lang="javascript">
 
(function() {
 
(function() {
var brd = JXG.JSXGraph.initBoard('jxgbox2',{boundingbox:[-5,5,5,-5], keepaspectratio:true});
+
var brd = JXG.JSXGraph.initBoard('jxgbox3',{boundingbox:[-5,5,5,-5], keepaspectratio:true});
  
 
var O = brd.create('point',[0,0],{name:'O',fixed:true, fillColor:'blue', strokeColor:'blue'});
 
var O = brd.create('point',[0,0],{name:'O',fixed:true, fillColor:'blue', strokeColor:'blue'});
Line 136: Line 136:
  
 
var g1a = brd.create('line',[O,C], {strokeColor:'lightgray'});
 
var g1a = brd.create('line',[O,C], {strokeColor:'lightgray'});
var C2 = brd.create('reflection',[g1a,B],{name:'C_2', fillColor:'blue', strokeColor:'blue'});
+
var C2 = brd.create('reflection',[g1a,A],{name:'C_2', fillColor:'blue', strokeColor:'blue'});
  
 
var M = brd.create('glider',[2,2,g1], {name:'M', fillColor:'red', strokeColor:'red'});
 
var M = brd.create('glider',[2,2,g1], {name:'M', fillColor:'red', strokeColor:'red'});

Revision as of 18:22, 19 July 2010

Double speed

The speed of [math]C[/math] is double the speed of [math]B[/math].

The JavaScript code

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

var O = brd.create('point',[0,0],{name:'O',fixed:true, fillColor:'blue', strokeColor:'blue'});
var A = brd.create('point',[2,0],{name:'A'});
var k = brd.create('circle',[O,A],{name:'k'});
var B = brd.create('glider',[0.7,1,k],{name:'B drag me'});
var g1 = brd.create('line',[O,B], {strokeColor:'lightgray'});
var C = brd.create('reflection',[g1,A],{name:'C', fillColor:'blue', strokeColor:'blue'});

var M = brd.create('glider',[2,2,g1], {name:'M', fillColor:'red', strokeColor:'red'});
var k2 = brd.create('circle',[M,B],{name:'k'});  

var gpar = brd.create('parallel',[O,C,M], {name:"g", strokeColor:'lightgray'});
var Cprime = brd.create('intersection',[gpar,k2,0], {name:"C'", fillColor:'blue', strokeColor:'blue'});

var g2 = brd.create('line',[M,Cprime], {strokeColor:'lightgray'});
var Cstern = brd.create('glider',[1,1,g2], {name:"C*", trace:true, fillColor:'green', strokeColor:'green'});
})();

Threefold speed

The speed of [math]C_2[/math] is three times the speed of [math]B[/math].

The JavaScript code

(function() {
var brd = JXG.JSXGraph.initBoard('jxgbox2',{boundingbox:[-5,5,5,-5], keepaspectratio:true});

var O = brd.create('point',[0,0],{name:'O',fixed:true, fillColor:'blue', strokeColor:'blue'});
var A = brd.create('point',[2,0],{name:'A'});
var k = brd.create('circle',[O,A],{name:'k'});
var B = brd.create('glider',[0.7,1,k],{name:'B drag me'});
var g1 = brd.create('line',[O,B], {strokeColor:'lightgray'});
var C = brd.create('reflection',[g1,A],{name:'C', fillColor:'blue', strokeColor:'blue'});

var g1a = brd.create('line',[O,C], {strokeColor:'lightgray'});
var C2 = brd.create('reflection',[g1a,B],{name:'C_2', fillColor:'blue', strokeColor:'blue'});

var M = brd.create('glider',[2,2,g1], {name:'M', fillColor:'red', strokeColor:'red'});
var k2 = brd.create('circle',[M,B],{name:'k'});  

var gpar = brd.create('parallel',[O,C2,M], {name:"g", strokeColor:'lightgray'});
var Cprime = brd.create('intersection',[gpar,k2,0], {name:"C'", fillColor:'blue', strokeColor:'blue'});

var g2 = brd.create('line',[M,Cprime], {strokeColor:'lightgray'});
var Cstern = brd.create('glider',[1,1,g2], {name:"C*", trace:true, fillColor:'green', strokeColor:'green'});
})();

Fourfold speed

The speed of [math]C_2[/math] is four times the speed of [math]B[/math].

The JavaScript code

(function() {
var brd = JXG.JSXGraph.initBoard('jxgbox3',{boundingbox:[-5,5,5,-5], keepaspectratio:true});

var O = brd.create('point',[0,0],{name:'O',fixed:true, fillColor:'blue', strokeColor:'blue'});
var A = brd.create('point',[2,0],{name:'A'});
var k = brd.create('circle',[O,A],{name:'k'});
var B = brd.create('glider',[0.7,1,k],{name:'B drag me'});
var g1 = brd.create('line',[O,B], {strokeColor:'lightgray'});
var C = brd.create('reflection',[g1,A],{name:'C', fillColor:'blue', strokeColor:'blue'});

var g1a = brd.create('line',[O,C], {strokeColor:'lightgray'});
var C2 = brd.create('reflection',[g1a,A],{name:'C_2', fillColor:'blue', strokeColor:'blue'});

var M = brd.create('glider',[2,2,g1], {name:'M', fillColor:'red', strokeColor:'red'});
var k2 = brd.create('circle',[M,B],{name:'k'});  

var gpar = brd.create('parallel',[O,C2,M], {name:"g", strokeColor:'lightgray'});
var Cprime = brd.create('intersection',[gpar,k2,0], {name:"C'", fillColor:'blue', strokeColor:'blue'});

var g2 = brd.create('line',[M,Cprime], {strokeColor:'lightgray'});
var Cstern = brd.create('glider',[1,1,g2], {name:"C*", trace:true, fillColor:'green', strokeColor:'green'});
})();