Rolling circle on circle: Difference between revisions

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Line 1: Line 1:
<jsxgraph width="0" height="0" box="nix"></jsxgraph>
<html>
<html>
<script type="text/javascript" src="/~alfred/jsxgraph/trunk/src/Roulette.js"></script>
<form>
<form>
<input type="button" value="start" onclick="rol.start()">
<input type="button" value="start" onclick="rol.start()">
Line 11: Line 9:
var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-5,5,5,-5], keepaspectratio:true});
var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-5,5,5,-5], keepaspectratio:true});
brd.suspendUpdate();
brd.suspendUpdate();
// Big circle
// Big circle
var bigCircle = brd.create('curve', [
var bigCircle = brd.create('curve', [
Line 20: Line 17:
var C = brd.create('point',[2,0],{name:'C'});
var C = brd.create('point',[2,0],{name:'C'});
var circle = brd.create('curve',[
var circle = brd.create('curve',[
                     function(t){var d = P.Dist(C);
                     function(t){var d = P.Dist(C),
                                    beta = JXG.Math.Geometry.rad([C.X()+1,C.Y()],C,P);
                                t += beta;
                                 return C.X()+d*Math.cos(t);
                                 return C.X()+d*Math.cos(t);
                     },
                     },
                     function(t){var d = P.Dist(C);
                     function(t){var d = P.Dist(C),
                                    beta = JXG.Math.Geometry.rad([C.X()+1,C.Y()],C,P);
                                t += beta;
                                 return C.Y()+d*Math.sin(t);
                                 return C.Y()+d*Math.sin(t);
                     },
                     },
Line 30: Line 31:


// Point on circle
// Point on circle
var B = brd.create('glider',[0,2,circle],{name:'B', color:'blue',trace:true});
var B = brd.create('glider',[0,2,circle],{name:'B', color:'blue',trace:false});
brd.create('segment',[C,B],{color:'black'});  
brd.create('segment',[C,B],{color:'black'});  
brd.unsuspendUpdate();
brd.unsuspendUpdate();
var rol = JXG.Math.Numerics.createRoulette(bigCircle, circle, 0, Math.PI/90, 50, [C,P,B]);  
var rol = brd.createRoulette(bigCircle, circle, 0, Math.PI/45, -1, 150, [C,P,B]);  


</jsxgraph>
</jsxgraph>

Latest revision as of 17:19, 23 November 2010

The underlying JavaScript code

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