# Difference between revisions of "Random points"

From JSXGraph Wiki

A WASSERMANN (talk | contribs) |
A WASSERMANN (talk | contribs) |
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===Draw 50 random points - version 2=== | ===Draw 50 random points - version 2=== | ||

− | Here, at construction time | + | 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. | The 50 points are updated on the onmousemove event. | ||

− | Please, move | + | Please, move the mouse pointer over this area: |

<html> | <html> | ||

<div id="box2" class="jxgbox" style="width:400px; height:400px;" onmousemove="board2.update()"></div> | <div id="box2" class="jxgbox" style="width:400px; height:400px;" onmousemove="board2.update()"></div> |

## Revision as of 09:18, 8 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 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();
```