function (capture) {
      var self = this;
      self.clear();
      self.capture = capture;
      self.capture_idx = index_capture(capture);
      self.render();      
    }
function (capture) {
      var self = this;
      self.clear();
      self.capture = capture;
      self.capture_idx = index_capture(capture);
      self.render();      
    }
function ( capture ) { var self = this ; self . clear ( ) ; self . capture = capture ; self . capture_idx = index_capture ( capture ) ; self . render ( ) ; }
update with new capture data and re-render
update with new capture data and re - render