Programming turtle graphics: Difference between revisions

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===List of available commands===
==Input==
There is a predefined turtle object ''t''. Therefore, all commands
* [[List of available commands]]
start with ''t'', like ''t.fd(100)'';
* t.forward(len); or t.fd(len);
* t.back(len); or t.bk(len);
* t.right(angle); or t.rt(angle); (<math>0\leq angle \leq 360</math>)
* t.left(angle); or t.lt(angle);
* t.penUp(); or t.pu();
* t.penDown(); or t.pd();
* t.clearScreen(); or t.cs();
* t.clean();
* t.setPos(x,y);
* t.home();
* t.hideTurtle(); or t.ht();
* t.showTurtle(); or t.st();
* t.setPenSize(size); (size: number)
* t.setPenColor(col); (col: colorString, e.g. 'red' or '#ff0000')


===Input===
<html>
<html>
<link rel="stylesheet" type="text/css" href="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraph.css" />
<form><textarea id="inputtext" rows=5 cols=35 wrap="off" style="width:600px;">t.fd(100);</textarea><br />
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/prototype.js"></script>
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraphcore.js"></script>
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/jsxturtle.js"></script>
<form><textarea id="inputtext" rows=3 cols=35 wrap="off" style="width:600px;">t.fd(100);</textarea><br />
<input type="button" value="run" onClick="run()">
<input type="button" value="run" onClick="run()">
<input type="button" value="clear" onClick="clearturtle()">
<input type="button" value="clear" onClick="clearturtle()">
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</form>
</form>
</html>
</html>
===Output===
 
<html>
==Output==
<div id="box" class="jxgbox" style="width:600px; height:600px;"></div>
<jsxgraph box="box" width="600" height="600">
<script language="JavaScript">
var brd = JXG.JSXGraph.initBoard('box', {boundingbox: [-300, 300, 300, -300]});
var brd = JXG.JSXGraph.initBoard('box', {originX: 300, originY: 300, unitX: 1, unitY: 1});
var t = brd.create('turtle');
var t = new JSXTurtleObj(brd);
function run() {
function run() {
   brd.suspendUpdate();
   brd.suspendUpdate();
   var code = $('inputtext').value;
   var code = document.getElementById('inputtext').value;
   if (code=='') { return; }
   if (code=='') { return; }
   eval(code);
   eval(code);
   $('logwindow').innerHTML += code+'\n';
   document.getElementById('logwindow').innerHTML += code+'\n';
   //$('inputtext').value = '';
   //document.getElementById('inputtext').value = '';
   brd.unsuspendUpdate();
   brd.unsuspendUpdate();
}
}
function clearturtle() {
function clearturtle() {
   t.cs();
   t.cs();
   $('inputtext').value = 't.fd(100);';
   //document.getElementById('inputtext').value = 't.fd(100);';
}
}
function clearlog() {
function clearlog() {
   $('logwindow').innerHTML = '';
   document.getElementById('logwindow').innerHTML = '';
}
}
</script>
</jsxgraph>
</html>
 
===Log window===
==Log window==
<html>
<html>
<pre id="logwindow" class="javascript javascript" style="font-family:monospace;"></pre>
<pre id="logwindow" class="javascript javascript" style="font-family:monospace;"></pre>
</html>
</html>
==Source code==
<source lang="html4strict">
<form><textarea id="inputtext" rows=3 cols=35 wrap="off" style="width:600px;">t.fd(100);</textarea><br />
<input type="button" value="run" onClick="run()">
<input type="button" value="clear" onClick="clearturtle()">
<input type="button" value="clear log" onClick="clearlog()">
</form>
<pre id="logwindow" class="javascript javascript" style="font-family:monospace;"></pre>
</source>
<source lang="javascript">
var brd = JXG.JSXGraph.initBoard('box', {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);
  document.getElementById('logwindow').innerHTML += code+'\n';
  brd.unsuspendUpdate();
}
function clearturtle() {
  t.cs();
  //document.getElementById('inputtext').value = 't.fd(100);';
}
function clearlog() {
  document.getElementById('logwindow').innerHTML = '';
}
</source>
* How to "[[Slow the turtle down]]"
[[Category:Examples]]
[[Category:Turtle Graphics]]

Latest revision as of 12:00, 8 June 2011

Input


Output

Log window






Source code


<form><textarea id="inputtext" rows=3 cols=35 wrap="off" style="width:600px;">t.fd(100);</textarea><br />
<input type="button" value="run" onClick="run()">
<input type="button" value="clear" onClick="clearturtle()">
<input type="button" value="clear log" onClick="clearlog()">
</form>
<pre id="logwindow" class="javascript javascript" style="font-family:monospace;"></pre>



var brd = JXG.JSXGraph.initBoard('box', {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);
  document.getElementById('logwindow').innerHTML += code+'\n';
  brd.unsuspendUpdate();
}

function clearturtle() {
  t.cs();
  //document.getElementById('inputtext').value = 't.fd(100);';
}
function clearlog() {
  document.getElementById('logwindow').innerHTML = '';
}




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