View source for Turtle spiral

<html>
<form><textarea id="inputtext" rows=5 cols=35 wrap="off" style="width:600px;">for (var i=0;i<100;i++){
 t.forward(i*3);
 t.left(71);
}
</textarea><br />
<input type="button" value="run" onClick="run()">
<input type="button" value="clear" onClick="clearturtle()">
</form>
</html>

<jsxgraph width="600" height="600">
var brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox: [-300, 300, 300, -300]});
var t = brd.create('turtle');

function run() {
  brd.suspendUpdate();
  var code = document.getElementById('inputtext').value;
  if (code=='') { return; }
  eval(code);
  brd.unsuspendUpdate();
}
function clearturtle() {
  t.cs();
}
run();
</jsxgraph>

===Source code===
<source lang="javascript">
var brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox: [-300, 300, 300, -300]});
var t = brd.create('turtle');

function run() {
  brd.suspendUpdate();
  var code = document.getElementById('inputtext').value;
  if (code=='') { return; }
  eval(code);
  brd.unsuspendUpdate();
}
function clearturtle() {
  t.cs();
}
run();
</source>

* Hints how to "[[Slow the turtle down]]"

===External links===
* [http://www.geogebra.org/de/wiki/index.php/Turtlegrafik A similar construction with GeoGebra]
* [http://wiki.zum.de/Turtle-Grafik ZUM-Wiki's Turtle graphics page]

[[Category:Examples]]
[[Category:Turtle Graphics]]