vis.helper.js

var view =
{
  'start':0,
  'end':0,

  'zoomout':function ()
  {
    var time_window = this.end - this.start;
    var middle = this.start + time_window / 2;
    time_window = time_window * 2;
    this.start = middle - (time_window/2);
    this.end = middle + (time_window/2);
  },

  'zoomin':function ()
  {
    var time_window = this.end - this.start;
    var middle = this.start + time_window / 2;
    time_window = time_window * 0.5;
    this.start = middle - (time_window/2);
    this.end = middle + (time_window/2);
  },

  'panright':function ()
  {
    var time_window = this.end - this.start;
    var shiftsize = time_window * 0.2;
    this.start += shiftsize;
    this.end += shiftsize;
  },

  'panleft':function ()
  {
    var time_window = this.end - this.start;
    var shiftsize = time_window * 0.2;
    this.start -= shiftsize;
    this.end -= shiftsize;
  },

  'timewindow':function(time)
  {
    this.start = ((new Date()).getTime())-(3600000*24*time);	//Get start time
    this.end = (new Date()).getTime();	//Get end time
  }
}