## Generating Documentation for OWA-EPANET 2.2

You must have [Doxygen](http://www.doxygen.nl)  installed on your machine to generate documentation for the OWA-EPANET Toolkit. Assuming this is the case, open a terminal window, navigate to the project's `doc` directory and issue the command `doxygen`. This will generate HTML documentation placed in a sub-directory named `html`.  From that directory you can launch the `index.html` file to view the full documentation in a web browser.

To generate a Windows compiled HTML Help file you must have [Microsoft's HTML Help Workshop](https://www.microsoft.com/en-us/download/details.aspx?id=21138) installed. You  then need to edit the Doxygen configuration file `doxyfile` as follows:

1. Change the `GENERATE_HTMLHELP` setting to `YES`.

2. Enter the location where the Help Workshop system was installed next to the
   `HHC_LOCATION` setting.

After running Doxygen again the resulting Help file named `owa-epanet.chm` will appear in the `html` sub-directory.

Doxygen uses the special comments placed in the project's `epanet2_2.h` and  `epanet2_enums.h` header files to document EPANET's API. It also uses supplementary material contained in the following files of the project's `doc` directory to generate additional pages of documentation:

- `main.dox`:  generates the *Overview* section.
- `usage.dox`: generates the *Usage* section.
- `toolkit-examples.dox` : generates the *Examples* section.
- `toolkit-files.dox`: generates the *Toolkit Files* section.
- `input-file.dox`: generates the *Input File* sub-section.
- `toolkit-units.dox`:  generates the *Measurement Units* section.
- `modules.dox`: defines the contents of the *API Reference* section.
             
Finally, a group of special Doxygen files are used to customize the format of the generated documentation. These include the following:
- `doxyfile`: the main Doxygen configuration file
- `DoxygenLayout.xml`: sets the title of the automatically generated *Modules* section to *API Reference* and hides the  *Files* section in the tree view pane of the document. 
- `extrastylesheet.css`: reduces the size of the the h1 heading style.
- `newfooter.html`: replaces the default Doxygen footer in HTML output with a custom one.