Programming turtle graphics: Difference between revisions

Revision as of 10:23, 21 December 2008

There is a predefined turtle object t. Therefore, all 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]\displaystyle{ 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')

@@ Line 23: / Line 23: @@
 <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="input" rows=3 cols=35 wrap="off" style="width:600px; float:left;">
+</textarea>
+<input type="button" value="run" onClick="run()">
+</form>
 <div id="box" class="jxgbox" style="width:600px; height:600px;"></div>
 <script language="JavaScript">
 var brd = JXG.JSXGraph.initBoard('box', {originX: 300, originY: 300, unitX: 1, unitY: 1});
 var t = new JSXTurtleObj(brd);
-function run(nr) {
+function run() {
    brd.suspendUpdate();
-   eval($('input'+nr).value);
+   eval($('input').value);
    brd.unsuspendUpdate();
 }
 </script>
 </html>