Rolling Reuleaux triangle: Difference between revisions
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A WASSERMANN (talk | contribs) (New page: <jsxgraph width="0" height="0" box="nix"></jsxgraph> <html> <script type="text/javascript" src="/~alfred/jsxgraph/trunk/src/Roulette.js"></script> <form> <input type="button" value="start"...) |
A WASSERMANN (talk | contribs) No edit summary |
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| Line 1: | Line 1: | ||
<html> | <html> | ||
<form> | <form> | ||
<input type="button" value="start" onclick="rol3.start();"> | <input type="button" value="start" onclick="rol3.start();"> | ||
| Line 17: | Line 15: | ||
var B = brd.create('point',[0,0]); | var B = brd.create('point',[0,0]); | ||
var pol3 = brd.create('regularpolygon',[A,B,3], {withLines:false, fillColor:'none', highlightFillColor:'none', fillOpacity:0.0}); | var pol3 = brd.create('regularpolygon',[A,B,3], {withLines:false, fillColor:'none', highlightFillColor:'none', fillOpacity:0.0}); | ||
for (var i=0;i< | for (var i=0;i<3;i++) pol3.vertices[i].setProperty({color:'#3d1c24'}); | ||
var line = brd.create('curve',[function(t){return t;}, function(t){return -2;}], | var line = brd.create('curve',[function(t){return t;}, function(t){return -2;}], | ||
{strokeWidth:6, strokeColor:'#d66d55', fillColor:'#d6bb55', highlightFillColor:'#d6bb55'}); | {strokeWidth:6, strokeColor:'#d66d55', fillColor:'#d6bb55', highlightFillColor:'#d6bb55'}); | ||
var reuleauxTriangle = brd.create('curve', JXG.Math. | var reuleauxTriangle = brd.create('curve', JXG.Math.Geometry.reuleauxPolygon(pol3.vertices, 3), | ||
{strokeWidth:6, strokeColor:'#d66d55', fillColor:'#ad5544', highlightFillColor:'#ad5544'}); | {strokeWidth:6, strokeColor:'#d66d55', fillColor:'#ad5544', highlightFillColor:'#ad5544'}); | ||
var S = brd.create('point', [ | |||
function(){return (pol3.vertices[0].X()+pol3.vertices[1].X()+pol3.vertices[2].X())/3; }, | |||
function(){return (pol3.vertices[0].Y()+pol3.vertices[1].Y()+pol3.vertices[2].Y())/3; }], | |||
{strokeColor:'#703545', fillColor:'#703545', highlightFillColor:'#703545', name:'S', trace:true}); | |||
brd.unsuspendUpdate(); | brd.unsuspendUpdate(); | ||
var rol3 = brd.createRoulette(line, reuleauxTriangle, -2, Math.PI/45, 1, 100, [A,B]); | |||
var rol3 = | |||
</jsxgraph> | </jsxgraph> | ||
===The underlying JavaScript code=== | ===The underlying JavaScript code=== | ||
<source lang="javascript"> | <source lang="javascript"> | ||
var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-2,7,20,-3], keepaspectratio:true}); | |||
brd.renderer.container.style.backgroundColor = '#3d1c24'; // background color board | |||
brd.suspendUpdate(); | |||
// Triangle | |||
var A = brd.create('point',[-2,-2]); | |||
var B = brd.create('point',[0,0]); | |||
var pol3 = brd.create('regularpolygon',[A,B,3], {withLines:false, fillColor:'none', highlightFillColor:'none', fillOpacity:0.0}); | |||
for (var i=0;i<3;i++) pol3.vertices[i].setProperty({color:'#3d1c24'}); | |||
var line = brd.create('curve',[function(t){return t;}, function(t){return -2;}], | |||
{strokeWidth:6, strokeColor:'#d66d55', fillColor:'#d6bb55', highlightFillColor:'#d6bb55'}); | |||
var reuleauxTriangle = brd.create('curve', JXG.Math.Geometry.reuleauxPolygon(pol3.vertices, 3), | |||
{strokeWidth:6, strokeColor:'#d66d55', fillColor:'#ad5544', highlightFillColor:'#ad5544'}); | |||
var S = brd.create('point', [ | |||
function(){return (pol3.vertices[0].X()+pol3.vertices[1].X()+pol3.vertices[2].X())/3; }, | |||
function(){return (pol3.vertices[0].Y()+pol3.vertices[1].Y()+pol3.vertices[2].Y())/3; }], | |||
{strokeColor:'#703545', fillColor:'#703545', highlightFillColor:'#703545', name:'S', trace:true}); | |||
brd.unsuspendUpdate(); | |||
var rol3 = brd.createRoulette(line, reuleauxTriangle, -2, Math.PI/90, 1, 50, [A,B]); | |||
</source> | </source> | ||
Latest revision as of 15:53, 20 February 2013
The underlying JavaScript code
var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-2,7,20,-3], keepaspectratio:true});
brd.renderer.container.style.backgroundColor = '#3d1c24'; // background color board
brd.suspendUpdate();
// Triangle
var A = brd.create('point',[-2,-2]);
var B = brd.create('point',[0,0]);
var pol3 = brd.create('regularpolygon',[A,B,3], {withLines:false, fillColor:'none', highlightFillColor:'none', fillOpacity:0.0});
for (var i=0;i<3;i++) pol3.vertices[i].setProperty({color:'#3d1c24'});
var line = brd.create('curve',[function(t){return t;}, function(t){return -2;}],
{strokeWidth:6, strokeColor:'#d66d55', fillColor:'#d6bb55', highlightFillColor:'#d6bb55'});
var reuleauxTriangle = brd.create('curve', JXG.Math.Geometry.reuleauxPolygon(pol3.vertices, 3),
{strokeWidth:6, strokeColor:'#d66d55', fillColor:'#ad5544', highlightFillColor:'#ad5544'});
var S = brd.create('point', [
function(){return (pol3.vertices[0].X()+pol3.vertices[1].X()+pol3.vertices[2].X())/3; },
function(){return (pol3.vertices[0].Y()+pol3.vertices[1].Y()+pol3.vertices[2].Y())/3; }],
{strokeColor:'#703545', fillColor:'#703545', highlightFillColor:'#703545', name:'S', trace:true});
brd.unsuspendUpdate();
var rol3 = brd.createRoulette(line, reuleauxTriangle, -2, Math.PI/90, 1, 50, [A,B]);
