[gmt]

Well, I've done some more fiddling and come up with a version which seems to do what I want. Specifically:

1. Blended scribble (so I can use them for highlighting)

2. Browsing history (so I can jump to figures/references and back)

3. Jumping between scribbles (so I can see what edits I've made)

I attach a file with src/*cpp src/ipdf and inc/*.h - see a previous message in this thread.

_long_ presses on the buttons do:

up - toggle fullscreen
dot - toggle scribble/viewing mode
down - toggle toolbar

in scribble mode you can see the scribbles, and _short_ presses do:

up - last scribble (in page order)
dot - toggle black/thin pen and grey/thick pen
down - next scribble (in page order

in viewing mode you don't see the scribbles, and _short_ presses do:

up - last page/link
dot - refresh
down - next page/link

The history is like a web browser - all previous page turns/links are stored.

I think this might be useful for others on other threads who have mentioned they want to use the Illiad for editing technical documents - I am half way through someone's thesis and this is working fine.