digraph UML {
  rankdir  = BT
     
  fontname = "Courier New"
  fontsize = 10
     
  node [ fontname = "Courier New", fontsize = 10, shape = "record" ];
  edge [ fontname = "Courier New", fontsize = 10 ];
     
   subgraph clusterImageManager {
       bitmap_t[ label = "{bitmap_t|+x\l+y\l+w\l+h\l+data\l}" ];
       image_manager_t[ label = "{image_manager_t|+ get_bitmap(...)\l}" ];
       image_loader_t[ label = "{image_loader_t|+ load(...)\l}" ];

       image_manager_t->bitmap_t[constraint=false arrowhead=none];
       image_loader_t->image_manager_t[arrowhead=vee ];
   };
    
   image_loader_stb_t->image_loader_t[arrowhead=empty style=dashed];
}