Spirograph: Difference between revisions

Revision as of 15:10, 19 July 2010

@@ Line 2: / Line 2: @@
 var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-5,5,5,-5], kkeepaspectratio:true});
 var R = 2.0;
-var r = brd.create('slider',[[-3,4],[3,4],[-5,1,5]],{name:'r',snapWidth:0.2});
+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',snapWidth:0.2});
+var a = brd.create('slider',[[-3,3],[3,3],[-5,1,5]],{name:'a'});
 var c = brd.create('curve',[
       function(t){
-         var r1 = r.Value();
+         var r1 = Math.round(100.0*r.Value())/100.0;
-         return (R-r1)*Math.cos(r1/R*t)+a.Value()*Math.cos((1-r1/R)*t);
+         return (R-r1)*Math.cos(r1/R*t)+a1*Math.cos((1-r1/R)*t);
       },
       function(t){
-         var r1 = r.Value();
+         var r1 = Math.round(100.0*r.Value())/100.0;
-         return (R-r1)*Math.sin(r1/R*t)+a.Value()*Math.sin((1-r1/R)*t);
+        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