I am currently working on private car routing (http://forum.simutrans.com/index.php?topic=9595.msg111562#msg111562) for Experimental. I have it working for cities and factories, but not yet for tourist attractions. What I have found that I need to do to get acceptable performance is store nearby cities or connected factories in planquadrat_t or strasse_t tiles so that the program does not need to check iteratively for cities, industries and attractions at each step of the routing algorithm (this reduces execution speed by a factor of more than 10).
I am not quite sure how to do this for attractions, however, as they do not seem to store any co-ordinate/tile information in the way that cities and factories do. This must be accessible somewhere for the shape of attractions to be shown in outline on the minimap. May I ask - how might I go about iterating through all the tiles of an attraction to check whether there are any connected roads?
Post about "monuments being listed on attraction list" was split: http://forum.simutrans.com/index.php?topic=11420.0
Igor - thank you for organising the topics! I should be interested in any replies to the original post...
I am afraid that you have to loop over all adjacent tiles to find any roads.
You could add a way list to planquadrat, like the halt list. But that will waste too much memory.
Make a subclass to building only for attractions, which contains a list of ways in their private parts.
It is not immediately obvious how I find a list of all an attraction's tiles in order to identify which roads are next to them in the first place (how to store that information being a separate issue). How would I go about identifying an attraction's tiles?
Try looking at the remove tool. It would need to find all tiles in order to remove all parts of a building. There is also gebaeude_t::get_first_tile()
Thank you very much - have now managed to get this to work on my private-cars branch on Github. Much appreciated.