<!--
/*************************************************************
* This script is developed by Arturs Sosins aka ar2rsawseen, http://webcodingeasy.com
* Feel free to distribute and modify code, but keep reference to its creator
*
* Canvas Turtle provides LOGO Turtle Grpahics Javascript API
* and LOGO Turtle Grpahic language interpreter for drawing
* objects in Canvas
*
* For more information, examples and online documentation visit:
* http://webcodingeasy.com/JS-classes/Canvas-Turtle-graphics-using-javascript
**************************************************************/
-->
<html>
<head>
</head>
<body>
<div>
<p>Emulate formal grammar using string replace:</p>
<!--<pre>
axiom : draw 100
right 120
draw 100
right 120
draw 100
rule1 : draw 100 -> draw 100
left 60
draw 100
right 120
draw 100
left 60
draw 100
rule2 : right 120 -> right 120
rule3 : left 60 -> left 60
</pre>-->
</div>
<div id='logo_div'></div>
<p><input type='button' value='Next Step' onclick='next();'/></p>
<script src="./canvas_turtle.packed.js" type="text/javascript"></script>
<script>
var l = new canvas_turtle("logo_div", {
//width of canvas
width: 800,
//height of canvas
height: 600,
//start value for x axis
});
l.exec("left 90\r\nmove 5\r\nright 180");
var cmd = "draw 10\r\nright 120\r\ndraw 10\r\nright 120\r\ndraw 10";
l.exec(cmd);
function next(){
var rep = "draw 10\r\nleft 60\r\ndraw 10\r\nright 120\r\ndraw 10\r\nleft 60\r\ndraw 10";
l.clear();
l.exec("left 90\r\nmove 5\r\nright 180");
cmd = cmd.replace(new RegExp("draw 10", "g"), rep);
l.exec(cmd);
}
</script>
</body>
</html> |
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