title: how to change default font size for graphviz?
body: <p>I use doxygen + graphviz for documenting my code. graphviz does a nice job of generating images. </p>
  
  <p>Is there any way to change the default fontsize for graphviz? The default is 14, but I want to use 12 instead. </p>
  
  <p>Its a real pain to change the fontsize for individual elements like, nodes, subgraphs, edges ... etc.</p>
  
  <p>UPDATE:</p>
  
  <p>For reference here is the code I'm using in doxygen, (the text fields have been renamed, of course)</p>
  
  <pre><code>@dot
   strict digraph {
     node [shape = box, fontsize = 12];
       subgraph cluster_main {
         fontsize = 12;
         shape    = box;
         label    = "main";
         subgraph cluster_main_common {
           fontsize = 12;
           shape    = box;
           label    = "common";
           subgraph cluster_main_common_source {
             fontsize = 12;
             shape    = box;
             label    = "source"
             subgraph cluster_file1 {
               fontsize = 12;
               shape    = box;
               label    = "file1.c";
               gSystem [label = "var1" URL = "\ref var1"];
             }
             subgraph cluster_file2 {
               fontsize = 12;
               shape    = box;
               label    = "file2.c";
               gCard [label = "var2" URL = "\ref var2"];
             }
             subgraph cluster_file3 {
               fontsize = 12;
               shape    = box;
               label    = "file3.c";
               gPwrSupply [label = "var3" URL = "\ref var3"];
             }
           }
         }
         subgraph cluster_main_docs {
           fontsize = 12;
           shape    = box;
           label    = "docs";
           subgraph cluster_main_docs_features {
             fontsize = 12;
             shape    = box;
             label    = "features";
             subgraph cluster_main_docs_features_source {
               fontsize = 12;
               shape    = box;
               label    = "source"
               subgraph cluster_file4 {
                 fontsize = 12;
                 shape    = box;
                 label    = "file4.c";
                 deviceInfo [label = "var4" URL = "\ref var4"];
               }
             }
           }
         }
       }
     }
     @enddot
  </code></pre>