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(svn r25998) -Document [FS#5661]: why catchment area's are (slightly) inconsistent

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rubidium 2013-11-14 22:16:43 +00:00
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@ -403,3 +403,34 @@ Mouse cursor going missing with SDL [FS#4997]:
We cannot fix this problem as SDL simply does not provide the
required information in these corner cases. This is a bug in SDL
and as such there is little that we can do about it.
Inconsistent catchment areas [FS#5661]:
Due to performance decisions the catchment area for cargo accepted
by a station for delivery to houses or industries differs from the
catchment area for cargo that is delivered to stations from houses
or industries.
Conceptually they work the same, but the effect in game differs.
They work by finding the closest destination "around" the source
which is within a certain distance. This distance depends on the
type of station, e.g. road stops have a smaller catchment area than
large airports. In both cases the bounding box, the smallest
rectangle that contains all tiles of something, is searched for the
target of the cargo, and then spiraling outwards finding the closest
tile of the target.
In the case of a station with two tiles spread far apart with a house
that is within the station's bounding box, it would be possible that
the spiraling search from the house does not reach one of the station
tiles before the search ends, i.e. all tiles within that distance
are searched. So the house does not deliver cargo to the station. On
the other hand, the station will deliver cargo because the house
falls within the bounding box, and thus search area.
It is possible to make these consistent, but then cargo from a house
to a station needs to search up to 32 tiles around itself, i.e. 64
by 64 tiles, to find all possible stations it could deliver to
instead of 10 by 10 tiles (40 times more tiles). Alternatively the
search from a station could be changed to use the actual tiles, but
that would require considering checking 10 by 10 tiles for each of
the tiles of a station, instead of just once.