00,
        size: getRandomInt(4, 5)
      });
    networkGraph.signal({
        from: 'd',
        to: 'a',
        color: getRandomColor(),
        duration: 12000,
        size: getRandomInt(3, 5)
      });
  }, 1000);

  var hexGrid = new zeu.HexGrid('hex-grid', {
    viewWidth: 200,
    viewHeight: 200,
    space: 5,
    radius: 30,
    border: 1
  });

  var data = [
    {x: 0, y: 1}, 
    {x: 0, y: 2},
    {x: 1, y: 0},
    {x: 1, y: 1},
    {x: 1, y: 2},
    {x: 2, y: 1},
    {x: 2, y: 2}
  ];

  fo