Circle approximation: Difference between revisions

Revision as of 09:30, 24 June 2009

@@ Line 8: / Line 8: @@
 var rot = brd.createElement('transform', [function() {return Math.PI*2.0/n.Value();},p0], {type:'rotate'});  // angle, rotation center
 var ptmp = brd.createElement('point',[0,0],{visible:false,withLabel:false});  // dummy point for the rotation
-var c = brd.createElement('curve',[[],[]],{fillColor:'#ff3300',fillOpacity:0.5});
+var cIn = brd.createElement('curve',[[],[]],{fillColor:'#ff3300',fillOpacity:0.5});
+var cOut = brd.createElement('curve',[[],[]],{fillColor:'#0033ff',fillOpacity:0.5});
-c.updateDataArray = function() {
+cIn.updateDataArray = function() {
    var i;
    this.dataX = [p1.X()];
@@ Line 21: / Line 22: @@
    }
 }
+cOut.updateDataArray = function() {
+  var i;
+  var s = circ.getRadius()/Math.cos(Math.PI*2.0/n.Value);
+  this.dataX = [p0.X()+s];
+  this.dataY = [p0.Y()];
+  ptmp.setPositionDirectly(JXG.COORDS_BY_USER, p0.X()+s,p0.Y());
+  for (i=0;i<n.Value();i++) {
+    rot.applyOnce(ptmp);
+    this.dataX.push(ptmp.X());
+    this.dataY.push(ptmp.Y());
+  }
+}
 brd.update();