View source for Koch curve

<html>
<link rel="stylesheet" type="text/css" href="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraph.css" />
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraphcore.js"></script>
<form><textarea id="inputtext" rows=10 cols=35 wrap="off" style="width:600px;">
function koch(x,level) {
    if (level<1) {
        t.fd(x);
    } else {
        koch(x/3,level-1);
        t.lt(60);
        koch(x/3,level-1);
        t.rt(120);
        koch(x/3,level-1);
        t.lt(60);
        koch(x/3,level-1);
    }
}

t.cs();
t.hideTurtle();
t.setPos(-250,0);
t.rt(90);
koch(400,7);
        
</textarea><br />
<input type="button" value="run" onClick="run()">
<input type="button" value="clear" onClick="clearturtle()">
</form>
<div id="box" class="jxgbox" style="width:600px; height:400px;"></div>
<script language="JavaScript">
var brd = JXG.JSXGraph.initBoard('box', {originX: 300, originY: 300, unitX: 1, unitY: 1});
var t = brd.createElement('turtle');
function run() {
  brd.suspendUpdate();
  var code = document.getElementById('inputtext').value;
  if (code=='') { return; }
  eval(code);
  brd.unsuspendUpdate();
}
function clearturtle() {
  t.cs();
}
run();
</script>
</html>

===References===
* [http://www.mathcurve.com/fractals/koch/koch.shtml http://www.mathcurve.com/fractals/koch/koch.shtml]

===Source code===
<source lang="javascript">
var brd = JXG.JSXGraph.initBoard('box', {originX: 300, originY: 300, unitX: 1, unitY: 1});
var t = brd.createElement('turtle');
function run() {
  brd.suspendUpdate();
  var code = document.getElementById('inputtext').value;
  if (code=='') { return; }
  eval(code);
  brd.unsuspendUpdate();
}
function clearturtle() {
  t.cs();
}
run();

function koch(x,level) {
    if (level<1) {
        t.fd(x);
    } else {
        koch(x/3,level-1);<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/prototype.js"></script>

        t.lt(60);
        koch(x/3,level-1);
        t.rt(120);
        koch(x/3,level-1);
        t.lt(60);
        koch(x/3,level-1);
    }
}

t.cs();
t.hideTurtle();
t.setPos(-250,0);
t.rt(90);
koch(400,7);
</source>

[[Category:Examples]]<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/prototype.js"></script>

[[Category:Turtle Graphics]]
[[Category:Fractals]]
[[Category:Curves]]