Arc length: Difference between revisions

Revision as of 15:39, 11 June 2009

@@ Line 41: / Line 41: @@
-brd.createElement('text',[-6,-1,function(){ return 'Length='; }]);
+brd.createElement('text',[-6,-1,function(){
+   var i,s,f0,f1;
+   var m = n.Value();
+   m = Math.floor(m);
+   var d = (end-start)/m;
+   s = 0.0;
+   f0 = f(start);
+   for (i=1;i<=m;i++) {
+     f1 = f(start+i*d);
+     s += Math.sqrt(d*d+(f1-f0)*(f1-f0));
+     f0 = f1;
+   }
+   return 'Length='+s.toFixed(2); }]);
 </jsxgraph>