NML NewObject TileCheck's, how to detect Farm land?

[Aegir]

I think based off my own reading of the NML spec I've already answered my own question as a 'no' but I thought I'd throw it out there.

Currently I'm doing this:

Code: Select all

switch (FEAT_OBJECTS, SELF, switch_object_auto_build_rules,
			(terrain_type == TILETYPE_SNOW) ||
			(terrain_type == TILETYPE_DESERT) ||
			(nearby_tile_is_water( 0 , 0))
		) {
	1: return CB_RESULT_LOCATION_DISALLOW;
	return CB_RESULT_LOCATION_ALLOW;
}

with this:

Code: Select all

tile_check: switch_object_auto_build_rules;

hiding in the graphics{} block of each object to prevent some objects being built on snow, desert, or tiles directly adjacent the ocean. What I'd *really* love is to detect Farm Land and prevent construction on it too. I've already got "OBJ_FLAG_ANYTHING_REMOVE" set so in theory any farms being built after the fact should be able to clear the land easy-peasy, but these objects are all being generated at map gen time and are getting built after industries are already built and the newobjects are making swiss cheese of farms.

How do?

Thnx

[PikkaBird]

You're right, you can't.

(Nor, IMO, would it make much sense to - farm fields have gaps of clear land between them, so your object might still end up in the middle of a farm even if it could avoid the actual field tiles. And farms regularly construct new fields, so a field might get built around your object even if there was no field there when the object was placed).

[2TallTyler]

It would probably be relatively easy to add a tiletype for farm land (and perhaps include rough ground and rocks, perhaps as MP_ROUGH) and add the necessary NewGRF spec extensions for objects, houses, industries, etc.

[Eddi]

no, you can't just add tiletypes like that. that's an integral part of the map array.

you need to distinguish rough ground, fields, etc. with the other bits from the map array, as documented in "docs/landscape.html", and check whether those are exposed to newgrfs