Restrict points to limited area: Difference between revisions

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Restrict the points A, B, and C to the lower left quadrant.
<jsxgraph width="600" height="600">
<jsxgraph width="600" height="600">
var brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-5,5,5,-5], axis:true});
var brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-5,5,5,-5], axis:true});
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===The underlying JavaScript code===
===The underlying JavaScript code===
<source lang="javascript">
<source lang="javascript">
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();
});
</source>
</source>


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

Latest revision as of 09:47, 18 June 2013

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();
 });