Poincare disc model: Difference between revisions

Revision as of 08:30, 30 July 2010

Chaim Goodman-Strauss, "Compass and Straightedge in the Poincare Disk", Am. Math. Monthly 108 (2001), 38-49.

@@ Line 1: / Line 1: @@
 <jsxgraph width="600" height="600">
 var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-5,5,5,-5]});
-var c = brd.create('circle',[[0,0],3],{strokeColor:'black'});
+var c = brd.create('circle',[[0,0],3],{strokeColor:'black'});  // outer circle
 var p = brd.create('point',[0,-4],{withLabel:false});
 var t = brd.create('polar', [c,p], {strokeColor:'gray', dash:2, visible:false});
@@ Line 13: / Line 14: @@
 var A = brd.create('intersection', [l,t,0], {withLabel:true,visible:false});
 var M = brd.create('midpoint',[pp,A], {withLabel:true,visible:false});
-//var p0 = brd.create('perpendicularpoint',[l,M], {withLabel:true,visible:false});
-//var line = brd.create('line', [p0,M], {name:'', withLabel:false, strokeColor:'gray', dash:1});
 var line = brd.create('perpendicular',[l,M], {name:'', withLabel:false, strokeColor:'gray', dash:1, straightFirst:true, straightLast:true});
 line[1].setProperty({'visible':false});