IRC logs for #openttd on OFTC at 2022-07-21
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14:02:58 <Samu> if tile from and tile to are the same, it doesn't fail
14:04:51 <Samu> ok, i need to test something
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14:05:55 <Samu> there is no enforceprecondition with from != to
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14:33:56 <Samu> buildrail and removerail
14:34:23 <Samu> they have from != to as precondition in the hpp file
14:36:54 <Samu> it would be useful, at least from my point of view
14:37:28 <Samu> less code required in the pf script to ensure it won't add a neighbour going backwards
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15:03:49 <Samu> hmm, what's the point for requiring the from tile?
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15:09:50 <glx> helps to find the correct side of the tile for some tracks
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15:18:33 <Samu> i guess there's no need to enforce from != to
15:18:51 <Samu> but building backwards is sure strange
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15:33:39 <Samu> something still amiss in the enforceprecondition
15:34:15 <LordAro> Samu: it's tricky, as adding the enforceprecondition might break existing scripts
15:34:34 <LordAro> technically it's just that the documentation is wrong
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16:36:21 <Samu> from != to was not sufficient when the rail was longer than 1 tile
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16:37:24 <LordAro> doing arithmetic on tileindexes like that seems very wrong
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16:38:52 <Samu> i mean, all pathfinders kind of do it
16:39:01 <LordAro> but tileindexes are not contiguous
16:39:12 <nielsm> but you're not writing Squirrel here
16:39:32 <nielsm> you're writing C++ and you should use the helper functions to express the proper meaning
16:40:04 <nielsm> (the compiler is going to generate the same code, probably, but humans reading the code will better be able to reason about it and understand it)
16:40:11 <Samu> it's checking if the direction from a tile to another is the same
16:47:06 <Samu> okay, i can use DiagdirBetweenTiles
16:51:03 <Samu> there is however no ScriptMap::DiagdirBetweenTiles
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17:27:48 <Samu> (int)from - (int)tile == ((int)tile - (int)to) / ::DistanceManhattan(tile, to)
17:28:09 <Samu> we already know the distance from 'from' to 'tile' is 1
17:29:05 <Samu> tile and to can be however not in the same axis
17:29:23 <LordAro> if you have to explain it to us, it should be explained in code
17:29:29 <Samu> distancemanhattan gives integers, no decimals
17:29:30 <LordAro> preferably with an intermediate variable
17:30:29 <LordAro> but as you say, DiagdirBetweenTiles exists
17:30:32 <LordAro> why are you not using that?
17:30:43 <Samu> there is no equivalent squirrel function
17:30:52 <LordAro> ...you're not in squirrel?
17:30:57 <Samu> what would I write in the declaration
17:31:40 <LordAro> i don't understand the issue with writing it as is
17:32:05 <Samu> one would assume there is a Script::DiagdirBetweeTiles
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17:33:16 <Samu> I don't think any other function does that
17:35:02 <LordAro> there's plenty of @pre statements that aren't full code
17:39:11 <Samu> oh, you're right, found one
17:39:57 <Samu> in the comment it isn't there though, but the functionality is explained as a note
17:41:48 <Samu> so it's a matter of english now, and I'm bad at it
17:44:46 <Samu> i just realized there's no way to build a rail in the edge of the map if its direction is towards the void
17:45:27 <nielsm> good thing rail track isn't directional, you can just build away from the void instead
17:46:09 <Samu> well, the opposite direction still requires a tile to be in the void
17:46:29 <Samu> at least there's BuildRailTrack, to compensate
17:46:39 <Samu> where BuildRail would fail
17:48:31 <Samu> i think IsValidTile(from) and IsValidTile(to) don't need to be a precondition
17:50:07 <nielsm> on the other hand, how often is it actually a problem that you can't build a rail track that connects to the void?
17:50:56 <nielsm> maybe if you're doing some weird signals abuse to build computers
18:02:47 * Rubidium wonders when you want to make a track that starts or ends in the void
18:04:04 <Rubidium> in my opinion doing that very likely means your code (path finder) is broken in some way
18:06:11 <LordAro> occasionally you can see why CS just made the world border ocean
18:19:14 <nielsm> also regarding building on the edge, even if you make that function work for the south edges on the map, I think it could break on the north edges because you don't have void tiles there
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18:49:05 <Samu> what to write in the comment
19:24:21 <Samu> something in the rail pathfinder still confusing
19:24:50 <Samu> then the neighbours after crossing the bridge are...
19:28:11 <Samu> feels like it doesn't have to push 3 times
19:29:23 <Samu> 3 times the same neighbour with the same direction and the same cost/estimate
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19:58:56 <TrueBrain> glx: it is shocking how much less dependabot activity without boto* :P
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