each instance can be assigned to all columns of the corresponding type?
I've defined a single editor class that handles signed (accepts leading -)
Just integrated it into my code (just the 5 char verification)
can/should I use just one instance of the editor for all columns?
I have googled around and know the answer probably involves writing a cell editor
If editability is not relevant for your application, then I would go with Rob: use a BufferedImage to do your drawings (ironically, you must use the bi.getGraphics() for that as well), and in your paintComponent draw that bi.
But with this text pane i should have only place for 4 digits. (number from 1 to 100).