Spent several hours thinking, selecting the drawing tool and finally making the sketch. Decided to try some diagramming tools available for Android tablets and found one that I liked very much (DrawExpress Diagram) – it allowed me to produce quality schematics pretty fast, learning curve is very merciful and the tool supports various connector types to show OOP relations, “bring to front” / “send to back” functions to create composite objects like boxes inside boxes, etc. Of course there is a group selection ability and finally the most interesting part – the tool is gesture-based, there is a number of simple to remember gestures that draw stuff on screen.
However not everything was as smooth as I wanted it to be: when I was making final strokes to fplog draft design the application crashed and it started to crash every time I tried opening fplog.de file.. I thought that I would have to start over and was quite disappointed as you may imagine but there was a possibility the format of the file is human-readable like XML or something and there is a chance I can fix the corrupted file to make DrawExpress work with this file again.
Docked my Galaxy Note 10.1, fired a terminal, switched to root to see all files (yes, my tablet is rooted) and executed
find / -type f -name "*fplog*"
That gave me a file inside “/data/data/com.drawexpress.full/files/” so I copied it to a non-root accessible folder, chmod to 777 and copied to my PC over FTP.
When I opened fplog.de file I was pleased to find simple JSON inside, it looked like there were all objects sorted by creation time followed by array of connectors that connected all these objects. When the editor crashed I was trying to add couple of connectors, so I decided to remove several connectors from the end of the file. Well, few JSON objects later I was overwriting my original fplog.de file on my tablet with the one edited on PC.
Rejoice! It worked and DrawExpress stopped crashing, here is the design I was so eager to save: