Turtle Graphics: Difference between revisions
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A WASSERMANN (talk | contribs)  New page: <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/pro...  | 
				A WASSERMANN (talk | contribs) No edit summary  | 
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<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/jsxgraphcore.js"></script>  | ||
<form><textarea id="input" rows=7 cols=35 wrap="off" >  | <form><textarea id="input" rows=7 cols=35 wrap="off" >  | ||
</textarea  | </textarea>  | ||
<input type="button" value="plot" onClick="  | <input type="button" value="plot" onClick="run()" style='margin-right:1em'>    | ||
</form>  | </form>  | ||
<div id="box" class="jxgbox" style="width:600px; height:600px;"></div>  | <div id="box" class="jxgbox" style="width:600px; height:600px;"></div>  | ||
<script language="JavaScript">  | <script language="JavaScript">  | ||
            var turtleObj = function(board,attributes) {  | |||
                this.board = board;  | |||
                if (attributes==null) {  | |||
                    this.attributes = {  | |||
                        strokeColor:'#000000'  | |||
                    };  | |||
                } else {  | |||
                    this.attributes = attributes;  | |||
                }  | |||
                this.attributes.straightFirst = false;  | |||
                this.attributes.straightLast = false;  | |||
                this.init();  | |||
            };  | |||
            turtleObj.prototype.init = function() {  | |||
                this.points = [];  | |||
                this.pos = [0,0];  | |||
                this.isPenDown = true;  | |||
                this.dir = 90;  | |||
                var p = this.board.createElement('point',this.pos,{fixed:true,name:' ',visible:false});  | |||
                this.points.push(p);  | |||
                this.turtle = this.board.createElement('point',this.pos,{fixed:true,name:' ',visible:false});  | |||
                this.turtle2 = this.board.createElement('point',[this.pos[0],this.pos[1]+20],{fixed:true,name:' ',visible:false});  | |||
                this.board.createElement('line',[this.turtle,this.turtle2],  | |||
                        {lastArrow:true,strokeColor:'#ff0000',straightFirst:false,straightLast:false});  | |||
            }  | |||
            turtleObj.prototype.forward = function(len) {  | |||
                if (len==0) { return; }  | |||
                var dx = -len*Math.cos(this.dir*Math.PI/180.0);  | |||
                var dy = len*Math.sin(this.dir*Math.PI/180.0);  | |||
                var t = this.board.createElement('transform', [dx,dy], {type:'translate'});  | |||
                t.applyOnce(this.turtle);  | |||
                t.applyOnce(this.turtle2);  | |||
                this.pos[0] += dx;  | |||
                this.pos[1] += dy;  | |||
                var p = this.board.createElement('point',this.pos,{fixed:true,name:' ',visible:false});  | |||
                this.points.push(p);  | |||
                if (this.isPenDown) {  | |||
                    this.board.createElement('line',[this.points[this.points.length-2],p],this.attributes);  | |||
                }  | |||
                this.board.update();  | |||
            };  | |||
            turtleObj.prototype.back = function(len) {  | |||
                this.forward(-len);  | |||
            }  | |||
            turtleObj.prototype.right = function(angle) {  | |||
                this.dir += angle;  | |||
                var t = this.board.createElement('transform', [-angle*Math.PI/180.0,this.turtle], {type:'rotate'});  | |||
                t.applyOnce(this.turtle2);  | |||
                this.board.update();  | |||
            }  | |||
            turtleObj.prototype.left = function(angle) {  | |||
                this.right(-angle);  | |||
            }  | |||
            turtleObj.prototype.penUp = function() {  | |||
                this.isPenDown = false;  | |||
            }  | |||
            turtleObj.prototype.penDown = function() {  | |||
                this.isPenDown = true;  | |||
            }  | |||
            turtleObj.prototype.clear = function() {  | |||
                for(var el in this.board.objects) {  | |||
                    this.board.removeObject(el);  | |||
                }  | |||
                this.init();  | |||
            }  | |||
            turtleObj.prototype.fd = function(len) { this.forward(len); };  | |||
            turtleObj.prototype.bk = function(len) { this.back(len); };  | |||
            turtleObj.prototype.lt = function(angle) { this.left(angle); };  | |||
            turtleObj.prototype.rt = function(angle) { this.right(angle); };  | |||
            var brd = JXG.JSXGraph.initBoard('jsxgbox', {originX: 300, originY: 300, unitX: 1, unitY: 1});  | |||
            var t = new turtleObj(brd);  | |||
</script>  | </script>  | ||
</html>  | </html>  | ||
[[Category:Examples]]  | [[Category:Examples]]  | ||
Revision as of 15:28, 19 December 2008