Random points: Difference between revisions

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===Draw 50 random points===
===Draw 50 random points - version 1===
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>
</html>
<script language="JavaScript">
 
        board = JXG.JSXGraph.initBoard('box', {originX: 10, originY:390 , unitX:380 , unitY: 380});
<jsxgraph box="box" width="400" height="400">
board = JXG.JSXGraph.initBoard('box', {boundingbox: [-0.02, 1.02, 1.02, -0.02]});
                  
                  
        function reload() {
function reload() {
            JXG.JSXGraph.freeBoard(board);         
    JXG.JSXGraph.freeBoard(board);         
            board = JXG.JSXGraph.initBoard('box', {originX: 10, originY: 390, unitX: 380, unitY: 380});          
    board = JXG.JSXGraph.initBoard('box', {boundingbox: [-0.02, 1.02, 1.02, -0.02]});


            board.suspendUpdate();
    board.suspendUpdate();
            for (var i=0;i<50;i++) {
    for (var i=0;i<50;i++) {
                var p = board.createElement('point',
        var p = board.create('point',
                      [Math.random(),Math.random()],{style:5,name:' '});
            [Math.random(),Math.random()],{size:3,withLabel:false});
            }
    }
            board.unsuspendUpdate();
    board.unsuspendUpdate();
        }
}
        reload();
reload();
</script>
</jsxgraph>
</html>


<source lang="javascript">
<source lang="javascript">
        board = JXG.JSXGraph.initBoard('box', {originX: 10, originY:390 , unitX:380 , unitY: 380});
board = JXG.JSXGraph.initBoard('box', {boundingbox: [-0.02, 1.02, 1.02, -0.02]});
                  
                  
        function reload() {
function reload() {
            JXG.JSXGraph.freeBoard(board);         
    JXG.JSXGraph.freeBoard(board);         
            board = JXG.JSXGraph.initBoard('box', {originX: 10, originY: 390, unitX: 380, unitY: 380});          
    board = JXG.JSXGraph.initBoard('box', {boundingbox: [-0.02, 1.02, 1.02, -0.02]});


            board.suspendUpdate();
    board.suspendUpdate();
            for (var i=0;i<50;i++) {
    for (var i=0;i<50;i++) {
                var p = board.createElement('point',
        var p = board.create('point',
                      [Math.random(),Math.random()],{style:5,name:' '});
            [Math.random(),Math.random()],{size:3,withLabel:false});
            }
    }
            board.unsuspendUpdate();
    board.unsuspendUpdate();
        }
}
        reload();
reload();
</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 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.
new random coordinates.
The 50 points are updated on the onmousemove event.
<html>
 
<div id="box2" class="jxgbox" style="width:400px; height:400px;" onmouseover="board2.update()"></div>
Please, move the mouse pointer over this area:
<script language="JavaScript">
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();
</script>
</html>


<source lang="html4strict">
<jsxgraph box="box2" width="400" height="400">
<div id="box2" class="jxgbox" style="width:400px; height:400px;" onmouseover="board2.update()"></div>
board2 = JXG.JSXGraph.initBoard('box2', {boundingbox: [-0.02, 1.02, 1.02, -0.02]});
</source>
board2.suspendUpdate();
for (var i=0;i<50;i++) {
    var p2 = board2.create('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">
<source lang="javascript">
board2 = JXG.JSXGraph.initBoard('box2', {originX: 10, originY:390 , unitX:380 , unitY: 380});
board2 = JXG.JSXGraph.initBoard('box2', {boundingbox: [-0.02, 1.02, 1.02, -0.02]});
board2.suspendUpdate();
board2.suspendUpdate();
for (var i=0;i<50;i++) {
for (var i=0;i<50;i++) {
  var p2 = board2.createElement('point',
    var p2 = board2.create('point', [function(){return Math.random();},function(){ return Math.random()}], {size:3, withLabel: false});
          [function(){return Math.random();},function(){ return Math.random()}],
}
          {style:5,name:' '});
board2.unsuspendUpdate();
}
JXG.addEvent(document.getElementById('box2'), 'mousemove', function () { this.update(); }, board2);
board2.unsuspendUpdate();
</source>
</source>


[[Category:Examples]]
[[Category:Examples]]
[[Category:Statistics]]

Latest revision as of 08:19, 3 March 2021

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.create('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('box2', {boundingbox: [-0.02, 1.02, 1.02, -0.02]});
board2.suspendUpdate();
for (var i=0;i<50;i++) {
    var p2 = board2.create('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);