gistfile1.js

 var stickyInfo = {
  width: 0,
  height: 0,
  index: 0,
  nRows: 0,
  nCols: 0,
  nFrames: 0
};


scope.$watch('Animation', function (Animation) {
    // cuando tengamos animacion, vamos a ininiarlo y lanzarlo
    if (Animation) {
        stickyInfo.nRows = Math.ceil(Animation.nframes / Animation.rframes);
        stickyInfo.index = 0;
        stickyInfo.nCols = Animation.rframes;
        stickyInfo.nFrames = Animation.nframes;
        stickyInfo.width = Animation.width / Animation.rframes;
        stickyInfo.height = Animation.height / stickyInfo.nRows;
        // ininicar la animacion
        element.css({
            'backgroundPosition': '0 0',
                'background-image': 'url(' + Animation.url + ')',
                'width': stickyInfo.width + 'px',
                'height': stickyInfo.height + 'px'
        });
        scope.isAnimated = true; //queremos verlo animado siempre
    }
});