Difference between revisions of "Restrict points to limited area"

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Line 2: Line 2:
 
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});
 
var A = brd.create('point', [-1,-1], {name:'A'});
 
var A = brd.create('point', [-1,-1], {name:'A'});
−
var B = brd.create('point', [-3, 2], {name:'B'});
+
var B = brd.create('point', [-3, -3], {name:'B'});
−
var C = brd.create('point', [ 3, 0], {name:'C'});
+
var C = brd.create('point', [ -2, 0], {name:'C'});
  
 
brd.on('move', function() {
 
brd.on('move', function() {
 
   var list = [A, B, C], i;
 
   var list = [A, B, C], i;
−
+
 
 +
  brd.suspendUpdate();
 
   for (i = 0; i < list.length; ++i) {
 
   for (i = 0; i < list.length; ++i) {
−
       list[i].moveTo([Math.min(0, list[i].X()), Math.min(0, list[i].Y())]);
+
       list[i].moveTo(
 +
          [
 +
            Math.min(0, list[i].X()),  
 +
            Math.min(0, list[i].Y())
 +
          ]
 +
        );
 
   }
 
   }
 +
  brd.unsuspendUpdate();
 
  });
 
  });
  
Line 18: Line 25:
 
===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 P0 = brd.create('point', [-4,-1], {name:'', face:'[]'});
 
−
var P1 = brd.create('point', [4,-1], {name:'', face:'[]'});
 
−
var li = brd.create('line', [P0,P1]);
 
−
var A = brd.create('glider', [0,-1,li], {name:'A'});
 
−
var B = brd.create('glider', [-3,-1,li], {name:'B'});
 
−
var C = brd.create('glider', [ 3,-1,li], {name:'C'});
 
−
 
−
brd.on('update', function() {
 
−
  var list = [A, B, C], i;
 
−
 
−
  for (i=
 
−
 
−
});
 
 
</source>
 
</source>
  
 
[[Category:Examples]]
 
[[Category:Examples]]

Revision as of 11:46, 18 June 2013

The underlying JavaScript code

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