///Here we store the maps that can be displayed through properties.

   ///Here we store the maps that can be displayed through properties.

   MapStorage mapstorage;

   MapStorage mapstorage;

   ///Indicates whether the button of mouse is pressed or not

   ///Indicates whether the button of mouse is pressed or not

   ///At this location was the mousebutton pressed.

   ///At this location was the mousebutton pressed.

   ///It helps to calculate the distance of dragging.

   ///It helps to calculate the distance of dragging.

   double clicked_x, clicked_y;

   double clicked_x, clicked_y;