Function graph animation: Difference between revisions

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Line 6: Line 6:
   var start = -4,
   var start = -4,
       end = 4,
       end = 4,
       turtle = brd.create('turtle', [start, f(start)]);
      x = start,
      step = 0.2,
       turtle = brd.create('turtle', [x, f(x)]);


   turtle.hideTurtle()
   var moveForward = function() {
  turtle.moveTo([0,0]);
        x += step;
        if (x>end) {
            return;
        }
        turtle.moveTo([x, f(x)]);
        setTimeout(moveForward, 200);
    };
 
  turtle.hideTurtle();
  moveForward(); 
 


</jsxgraph>
</jsxgraph>
===The JavaScript code===
<source lang="javascript">
  // User supplied function to be drawn.
  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
</source>
[[Category:Examples]]
[[Category:Calculus]]
[[Category:Turtle Graphics]]

Latest revision as of 07:30, 31 October 2012

The JavaScript code

  // User supplied function to be drawn.
  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