GraphvizFormatter : Adds support of graphviz inline syntax


Author : Tam Kien Duong - nicky@deveha.com - development's page

Graphviz is a very nice tool to produce and generate graphs. It's maye be usefull to let user create directly graph to illustrate the content (or import figures from documents). This extension aims to provide a support of graphviz graph language description.


Requirements



Installation



If you're using URL Rewriting, don't forget to add a rule in your .htaccess file.

RewriteCond %{REQUEST_FILENAME} !uploads/.*$


How to use it


%%(graphviz)
digraph G {Hello->World}
%%

To Do



Live Test


Some live tests are available on the development's page.

The Code


graphviz.php (line 1)
  1. <?php
  2. #
  3. # WikkaWiki Formatter to display graphviz-graphs
  4. #
  5. # $Id: $
  6. #
  7. # Copyright (C) 2007, Tam Kien Duong http://cendres.net
  8. #
  9. # This file is Free Software.
  10. #
  11. # It is licensed under the following three licenses as alternatives:
  12. #   1. GNU Lesser General Public License (LGPL) V2.1 or any newer version
  13. #   2. GNU General Public License (GPL) V2 or any newer version
  14. #   3. Apache License, V2.0 or any newer version
  15. #
  16. # You may not use this file except in compliance with at least one of
  17. # the above three licenses.
  18. #
  19. # This file is based on Sebastian Dietzold Graphviz extension for WackoWiki
  20. # https://wiki.imise.uni-leipzig.de/Projects/WackoTuning?v=xii#h702-8
  21.  
  22. # if set to "" we test is the file in PATH
  23. $GraphVizSettings['bindir'] = "";
  24. $GraphVizSettings['filedir'] = $this->config["upload_path"];
  25.  
  26. # check, if there should be another tool than dot used
  27. if (isset($options['neato'])) $bin = "neato";
  28. elseif (isset($options['circo'])) $bin = "circo";
  29. elseif (isset($options['twopi'])) $bin = "twopi";
  30. elseif (isset($options['circo'])) $bin = "circo";
  31. elseif (isset($options['fdp'])) $bin = "fdp";
  32. else $bin = "dot";
  33. $GraphVizSettings['bin'] = $GraphVizSettings['bindir'] . $bin;
  34.  
  35. # write graphviz code to temporary text-file
  36. $tmpname = tempnam ($GraphVizSettings['filedir'], "temp");
  37. $tmpfile = fopen($tmpname, "w");
  38. fwrite($tmpfile, $text);
  39. fclose($tmpfile);
  40.  
  41. ### here starts the big code block ###
  42.  
  43.     ## step 1: convert the source-code to generated source code
  44.     $cmd = $GraphVizSettings['bin']." -Tdot -o $tmpname.dot $tmpname 2>&1";
  45.     $cmdOut = `{$cmd}`;
  46.     if ($cmdOut != "")
  47.     {
  48.         echo "<i>$cmdOut</i><br/>";
  49.         unlink($tmpname);
  50.     }
  51.     else
  52.     {
  53.         # extract the name of the graph (second string in first line)
  54.         $gname = file ("$tmpname.dot"); $gname = split(" ", $gname[0]); $gname = $gname[1];
  55.  
  56.         # the basename is generated in the same way like the upload-handler do this
  57.         $fname = $GraphVizSettings['filedir'] .'/'.$this->page['tag'].'/'.$gname;
  58.  
  59.         if(!file_exists($GraphVizSettings['filedir'] .'/'.$this->page['tag'])) mkdir($GraphVizSettings['filedir'] .'/'.$this->page['tag']);
  60.  
  61.         ## step 2: prepare and run the image command and put the image in the upload dir
  62.         $imagecmd = $GraphVizSettings['bin']." -Tpng -o $fname.png $tmpname.dot";
  63.         $cmdOut = `{$imagecmd}`;
  64.  
  65.         $imgurl = $this->config["base_url"].$GraphVizSettings['filedir'] .'/'.$this->page['tag'].'/'.$gname.".png";
  66.         $imagesize = getimagesize ($fname.".png");
  67.  
  68.         ## step 3: prepare and run the map command
  69.         $mapcmd = $GraphVizSettings['bin']." -Tcmap $tmpname.dot";
  70.         $map = `{$mapcmd}`;
  71.         if ($map == "")
  72.         {
  73.             # output without no image map
  74.             echo "<img border=\"0\" src=\"$imgurl\">\n";
  75.         }
  76.         else
  77.         {
  78.             # output with image map
  79.             echo "<map name=\"$gname\">$map</map>";
  80.             echo "<img border=\"0\" usemap=\"#$gname\" src=\"$imgurl\">\n";
  81.         }
  82.  
  83.         # clear the directory and vars
  84.         unset($cmdOut); # maybe this can cause trouble if un-unsetted
  85.         unlink($tmpname);
  86.         unlink($tmpname.".dot");
  87.     }
  88. ?>


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