Difference between revisions of "Random points"

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===Draw 50 random points - version 1===
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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" />
 
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/prototype.js"></script>
 
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraphcore.js"></script>
 
 
<form><input type='button' value="Reload" onClick="reload();"></form>
 
<form><input type='button' value="Reload" onClick="reload();"></form>
<div id="box" class="jxgbox" style="width:400px; height:400px;"></div>
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</html>
<script language="JavaScript">
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        board = JXG.JSXGraph.initBoard('box', {originX: 10, originY:390 , unitX:380 , unitY: 380});
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<jsxgraph box="box" width="400" height="400">
 +
board = JXG.JSXGraph.initBoard('box', {boundingbox: [-0.02, 1.02, 1.02, -0.02]});
 
                  
 
                  
        function reload() {
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function reload() {
            JXG.JSXGraph.freeBoard(board);         
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    JXG.JSXGraph.freeBoard(board);         
            board = JXG.JSXGraph.initBoard('box', {originX: 10, originY: 390, unitX: 380, unitY: 380});          
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    board = JXG.JSXGraph.initBoard('box', {boundingbox: [-0.02, 1.02, 1.02, -0.02]});
  
            board.suspendUpdate();
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    board.suspendUpdate();
            for (var i=0;i<100;i++) {
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    for (var i=0;i<50;i++) {
                var p = board.createElement('point',
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        var p = board.createElement('point',
                      [Math.random(),Math.random()],{style:5,name:' '});
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            [Math.random(),Math.random()],{size:3,withLabel:false});
            }
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    }
            board.unsuspendUpdate();
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    board.unsuspendUpdate();
        }
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}
        reload();
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reload();
</script>
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</jsxgraph>
</html>
 
  
 
<source lang="javascript">
 
<source lang="javascript">
 +
board = JXG.JSXGraph.initBoard('box', {boundingbox: [-0.02, 1.02, 1.02, -0.02]});
 +
               
 +
function reload() {
 +
    JXG.JSXGraph.freeBoard(board);       
 +
    board = JXG.JSXGraph.initBoard('box', {boundingbox: [-0.02, 1.02, 1.02, -0.02]});
 +
 +
    board.suspendUpdate();
 +
    for (var i=0;i<50;i++) {
 +
        var p = board.createElement('point',
 +
            [Math.random(),Math.random()],{size:3,withLabel:false});
 +
    }
 +
    board.unsuspendUpdate();
 +
}
 +
reload();
 
</source>
 
</source>
  
 +
===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:
 +
 +
<jsxgraph box="box2" width="400" height="400">
 +
board2 = JXG.JSXGraph.initBoard('box2', {boundingbox: [-0.02, 1.02, 1.02, -0.02]});
 +
board2.suspendUpdate();
 +
for (var i=0;i<50;i++) {
 +
    var p2 = board2.createElement('point', [function(){return Math.random();},function(){ return Math.random()}], {size:3, withLabel: false});
 +
}
 +
board2.unsuspendUpdate();
 +
JXG.addEvent(document.getElementById('box2'), 'mousemove', function () { this.update(); }, board2);
 +
</jsxgraph>
 +
 +
<source lang="javascript">
 +
board2 = JXG.JSXGraph.initBoard('box', {boundingbox: [-0.02, 1.02, 1.02, -0.02]});
 +
board2.suspendUpdate();
 +
for (var i=0;i<50;i++) {
 +
    var p2 = board2.createElement('point', [function(){return Math.random();},function(){ return Math.random()}], {size:3, withLabel: false});
 +
}
 +
board2.unsuspendUpdate();
 +
JXG.addEvent(document.getElementById('box2'), 'mousemove', function () { this.update(); }, board2);
 +
</source>
  
 
[[Category:Examples]]
 
[[Category:Examples]]
 +
[[Category:Statistics]]

Latest revision as of 14:17, 8 June 2011

Draw 50 random points - version 1

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

board = JXG.JSXGraph.initBoard('box', {boundingbox: [-0.02, 1.02, 1.02, -0.02]});
                
function reload() {
    JXG.JSXGraph.freeBoard(board);        
    board = JXG.JSXGraph.initBoard('box', {boundingbox: [-0.02, 1.02, 1.02, -0.02]});

    board.suspendUpdate();
    for (var i=0;i<50;i++) {
        var p = board.createElement('point',
            [Math.random(),Math.random()],{size:3,withLabel:false});
    }
    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:

board2 = JXG.JSXGraph.initBoard('box', {boundingbox: [-0.02, 1.02, 1.02, -0.02]});
board2.suspendUpdate();
for (var i=0;i<50;i++) {
    var p2 = board2.createElement('point', [function(){return Math.random();},function(){ return Math.random()}], {size:3, withLabel: false});
}
board2.unsuspendUpdate();
JXG.addEvent(document.getElementById('box2'), 'mousemove', function () { this.update(); }, board2);