Hi)
I was working recently on this thing and it seems it may be useful for some of users here. Here's a small xml-only plugin to mark opened spots in some way.
How to use:
1) Include 'visited_spots.xml' into your tour.xml
2) Adjust 'visited_spots_check_settings'. There are only two settings now:
- 'style_to_check' - check if a hotspot belongs to that style and then do something
- 'what_to_do' - what actions to call from this hotspot (e.g. change crop, scale or smth else).
Here's working example (visited spots change crop to red):
http://vt.most-inform.com/bugs/visited/
Xml attached to the post. Enjoy!