code: function(){
      var s = this.selection.selection;
      return Math.abs(s.second.x - s.first.x) >= 5 || 
             Math.abs(s.second.y - s.first.y) >= 5;
    }
docs: Determines whether or not the selection is sane and should be drawn.
  @return {Boolean} - True when sane, false otherwise.