Difference between revisions of "Function graph animation"

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Line 20: Line 20:
  
 
   turtle.hideTurtle();
 
   turtle.hideTurtle();
   moveForward();
+
   moveForward();  
 
    
 
    
  
Line 48: Line 48:
  
 
   turtle.hideTurtle();    // Hide the turtle arrow
 
   turtle.hideTurtle();    // Hide the turtle arrow
   moveForward();
+
   moveForward();         // Start the drawing
 
</source>
 
</source>
  

Revision as of 08:29, 31 October 2012

The JavaScript code

  var f = function(x) { return Math.sin(x); };

  var brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-5,2,5,-2], axis:true, keepaspectratio:false});

  var start = -4,
      end = 4,
      x = start,
      step = 0.2,
      turtle = brd.create('turtle', [x, f(x)]);

  var moveForward = function() {
         x += step;
         if (x>end) {
            return;
         }
         turtle.moveTo([x, f(x)]);
         setTimeout(moveForward, 200); // delay by 200 ms
     };

  turtle.hideTurtle();    // Hide the turtle arrow
  moveForward();          // Start the drawing