digraph G { 
   
    rankdir  = BT
    fontname = "Courier New"
    fontsize = 12

    node [
        fontname = "Courier New"
        fontsize = 12
        shape    = "record"
        width = 0.4 
    ]   

   glyph_t[ label = "{glyph_t|+x\l+y\l+w\l+h\l+data\l}" ];
   font_t[ label = "{font_t|+match(...)\l+find_glyph(...) : glyph_t\l}" ];
   font_loader_t [ label = "{font_loader_t|+load(...) : font_t\l}" ];
   font_manager_t [ label = "{font_manager_t|+get_font(...) : font_t\l}" ];

   glyph_t -> font_t [arrowhead = ediamond ]
   canvas_t -> font_manager_t[arrowhead="vee" label="get_font"];
   font_t -> font_manager_t[arrowhead="none"];
   font_loader_t -> font_manager_t[arrowhead="none"];
   font_loader_t -> font_t [arrowhead="vee" label="load"];

   font_loader_ft_t -> font_loader_t[arrowhead=empty style=dashed]
   font_loader_stb_t -> font_loader_t[arrowhead=empty style=dashed]
   font_loader_bitmap_t -> font_loader_t[arrowhead=empty style=dashed]
 }