Dependent gliders

From JSXGraph Wiki
Revision as of 09:35, 18 June 2013 by A WASSERMANN (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.

The underlying JavaScript code

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 o;
    if (typeof brd.touches != 'undefined' && brd.touches.length>0) {
      o = brd.touches[0].obj;
    } else if (brd.mouse!=null && typeof brd.mouse.obj != 'undefined') {
      o = brd.mouse.obj;
    } else {
      return;
    }
 
    if (o==A) {
      B.position = A.position - 0.3;
      B.prepareUpdate().update(true).updateRenderer();

      C.setPositionDirectly(JXG.COORDS_BY_USER, [A.X()+3, C.Y()]); 
      C.prepareUpdate().update().updateRenderer();
    } else if (o==B) {
      A.position = B.position + 0.3;
      A.prepareUpdate().update(true).updateRenderer();

      C.setPositionDirectly(JXG.COORDS_BY_USER, [A.X()+3, C.Y()]); 
      C.prepareUpdate().update().updateRenderer();
    } else if (o==C) {
      A.setPositionDirectly(JXG.COORDS_BY_USER, [C.X()-3, A.Y()]); 
      A.prepareUpdate().update().updateRenderer();

      B.position = A.position - 0.3;
      B.prepareUpdate().update(true).updateRenderer();
    } 
 });