# Restrict points to limited area

From JSXGraph Wiki

Revision as of 11:47, 18 June 2013 by A WASSERMANN (talk | contribs)

Restrict the points A, B, and C to the lower left quadrant.

### The underlying JavaScript code

```
var brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-5,5,5,-5], axis:true});
var A = brd.create('point', [-1,-1], {name:'A'});
var B = brd.create('point', [-3, -3], {name:'B'});
var C = brd.create('point', [ -2, 0], {name:'C'});
brd.on('move', function() {
var list = [A, B, C], i;
brd.suspendUpdate();
for (i = 0; i < list.length; ++i) {
list[i].moveTo(
[
Math.min(0, list[i].X()),
Math.min(0, list[i].Y())
]
);
}
brd.unsuspendUpdate();
});
```