Difference between revisions of "Programming turtle graphics"

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===List of available commands===
+
==Input==
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There is a predefined turtle object ''t''. Therefore, all commands
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* [[List of available commands]]
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start with ''t'', like ''t.fd(100)'';
 
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* t.forward(len); or t.fd(len);
 
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* t.back(len); or t.bk(len);
 
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* t.right(angle); or t.rt(angle); (<math>0\leq angle \leq 360</math>)
 
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* t.left(angle); or t.lt(angle);
 
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* t.penUp(); or t.pu();
 
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* t.penDown(); or t.pd();
 
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* t.clearScreen(); or t.cs();
 
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* t.clean();
 
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* t.setPos(x,y);
 
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* t.home();
 
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* t.hideTurtle(); or t.ht();
 
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* t.showTurtle(); or t.st();
 
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* t.setPenSize(size); (size: number)
 
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* t.setPenColor(col); (col: colorString, e.g. 'red' or '#ff0000')
 
  
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===Input===
 
 
<html>
 
<html>
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<link rel="stylesheet" type="text/css" href="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraph.css" />
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<form><textarea id="inputtext" rows=5 cols=35 wrap="off" style="width:600px;">t.fd(100);</textarea><br />
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<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/prototype.js"></script>
 
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<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraphcore.js"></script>
 
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<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/jsxturtle.js"></script>
 
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<form><textarea id="input" rows=3 cols=35 wrap="off" style="width:600px;">
 
−
</textarea>
 
 
<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 log" onClick="clearlog()">
 
</form>
 
</form>
 
</html>
 
</html>
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===Output===
+
 
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<html>
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==Output==
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<div id="box" class="jxgbox" style="width:600px; height:600px;"></div>
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<jsxgraph box="box" width="600" height="600">
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<script language="JavaScript">
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var brd = JXG.JSXGraph.initBoard('box', {boundingbox: [-300, 300, 300, -300]});
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var brd = JXG.JSXGraph.initBoard('box', {originX: 300, originY: 300, unitX: 1, unitY: 1});
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var t = brd.create('turtle');
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var t = new JSXTurtleObj(brd);
 
 
function run() {
 
function run() {
 
   brd.suspendUpdate();
 
   brd.suspendUpdate();
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   eval($('input').value);
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  var code = document.getElementById('inputtext').value;
 +
  if (code=='') { return; }
 +
   eval(code);
 +
  document.getElementById('logwindow').innerHTML += code+'\n';
 +
  //document.getElementById('inputtext').value = '';
 
   brd.unsuspendUpdate();
 
   brd.unsuspendUpdate();
 
}
 
}
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</script>
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function clearturtle() {
 +
  t.cs();
 +
  //document.getElementById('inputtext').value = 't.fd(100);';
 +
}
 +
function clearlog() {
 +
  document.getElementById('logwindow').innerHTML = '';
 +
}
 +
</jsxgraph>
 +
 
 +
==Log window==
 +
<html>
 +
<pre id="logwindow" class="javascript javascript" style="font-family:monospace;"></pre>
 
</html>
 
</html>
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===Log window===
+
 
 +
==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">
 
<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>
 
</source>
 +
 +
* How to "[[Slow the turtle down]]"
 +
 +
[[Category:Examples]]
 +
[[Category:Turtle Graphics]]

Latest revision as of 14:00, 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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