Difference between revisions of "Random points"

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===Draw 50 random points===
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===Draw 50 random points - version 1===
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In the first version at construction time each point receives random coordinates.
 
<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" />
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</source>
 
</source>
  
===Draw 50 random points===
+
===Draw 50 random points - version 2===
These 50 points are updated on the onmouseover event and get
+
Here, at construction time ech 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.
new random coordinates.
+
The 50 points are updated on the onmousemove event.
 
<html>
 
<html>
<div id="box2" class="jxgbox" style="width:400px; height:400px;" onmouseover="board2.update()"></div>
+
<div id="box2" class="jxgbox" style="width:400px; height:400px;" onmousemove="board2.update()"></div>
 
<script language="JavaScript">
 
<script language="JavaScript">
 
  board2 = JXG.JSXGraph.initBoard('box2', {originX: 10, originY:390 , unitX:380 , unitY: 380});
 
  board2 = JXG.JSXGraph.initBoard('box2', {originX: 10, originY:390 , unitX:380 , unitY: 380});
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<source lang="html4strict">
 
<source lang="html4strict">
<div id="box2" class="jxgbox" style="width:400px; height:400px;" onmouseover="board2.update()"></div>
+
<div id="box2" class="jxgbox" style="width:400px; height:400px;" onmousemove="board2.update()"></div>
 
</source>
 
</source>
  

Revision as of 18:40, 7 December 2008

Draw 50 random points - version 1

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

        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 ech 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.

<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();