Difference between revisions of "Random points"

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===Draw 50 random points - version 1===
 
===Draw 50 random points - version 1===
In the first version at construction time each point receives random coordinates.
+
In the first version each point receives random coordinates once at construction time.
 
<html>
 
<html>
 
<link rel="stylesheet" type="text/css" href="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraph.css" />
 
<link rel="stylesheet" type="text/css" href="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraph.css" />

Revision as of 14:40, 15 December 2008

Draw 50 random points - version 1

In the first version each point receives random coordinates once at construction time.

        board = JXG.JSXGraph.initBoard('box', {originX: 10, originY:390 , unitX:380 , unitY: 380});
                
        function reload() {
            JXG.JSXGraph.freeBoard(board);        
            board = JXG.JSXGraph.initBoard('box', {originX: 10, originY: 390, unitX: 380, unitY: 380});            

            board.suspendUpdate();
            for (var i=0;i<50;i++) {
                var p = board.createElement('point',
                       [Math.random(),Math.random()],{style:5,name:' '});
            }
            board.unsuspendUpdate();
        }
        reload();

Draw 50 random points - version 2

Here, at construction time each point receives a function pair as coordinates. In each update these functions which return Math.random() are called. Thus in each update each point receives new random coordinates. The 50 points are updated on the onmousemove event.

Please, move the mouse pointer over this area:

<div id="box2" class="jxgbox" style="width:400px; height:400px;" onmousemove="board2.update()"></div>
 board2 = JXG.JSXGraph.initBoard('box2', {originX: 10, originY:390 , unitX:380 , unitY: 380});
 board2.suspendUpdate();
 for (var i=0;i<50;i++) {
   var p2 = board2.createElement('point',
           [function(){return Math.random();},function(){ return Math.random()}],
           {style:5,name:' '});
 }
 board2.unsuspendUpdate();