SWI-Prolog based shared diagram server

This repository provides a demonstration for using the recently added websocket support for realising a chat server. To use it, you must install SWI-Prolog 7.1.29 or later. Then, you can load demo_diagrammer.pl and run

?- server.

This will start the server at port 3080 in debug mode, showing a graphical window with the running server threads and debug messages in the console.

This advice is probably bogus, I have retained it because it's probably easy to get it working, but I haven't worked on it

Running as a service

The script daemon.pl is provided to start the server as a Unix daemon process. Run ./daemon.pl --help for a brief help message.

Starting as an upstart job

The service can be started as an (Ubuntu) upstart job by copying upstart/chat.conf to /etc/init editing /etc/init/chat.conf to reflect the installation directory. After that, run this command to start the server:

% sudo service chat start

Status

Minimally functional, pre alpha, at the moment this is mostly a way of poking at websockets. Tested with the server running on Linux using firefox and chromium as clients. Anne Ogborn confirmed it also works using Windows 7 as server and IE 11.0 as client.

Drawing

Select one of the tools (text is broken as I write this), left click to draw. Drag to move, right click drag to make connecting lines.

Future

The library hub.pl is probably going to end up as a core library and the demo program will than be added as a demo application.

Contributors

Anne Ogborn (Anniepoo) initial code
Craig Allen (cjallen88) fill color and picker
Brian Rogers (brog45) fix math for moving shapes; deletion of nodes; changing node shape and color

brog45 / whiteboard