## Description:
This PR optimizes how the rail network looks up railroads connecting two
stations by introducing an O(1) neighbor→railroad map on `TrainStation`.
It also updates `getOrientedRailroad` and railroad deletion to use this
new API, avoiding repeated linear scans over all railroads attached to a
station.
### What changed
- **TrainStation neighbor→railroad index**
- Added `railroadByNeighbor: Map<TrainStation, Railroad>` to
`TrainStation` for quick edge lookup.
- Kept `railroads: Set<Railroad>` for iteration and existing APIs.
- Updated lifecycle methods to keep both data structures in sync:
- `addRailroad(railRoad: Railroad)` now:
- Adds to `railroads`.
- Computes the neighbor station (`railRoad.from === this ? railRoad.to :
railRoad.from`).
- Stores the mapping in `railroadByNeighbor`.
- `removeRailroad(railRoad: Railroad)` now:
- Removes from `railroads`.
- Removes the corresponding entry from `railroadByNeighbor`.
- `clearRailroads()` now clears both `railroads` and
`railroadByNeighbor`.
- Added `getRailroadTo(station: TrainStation): Railroad | null` to
retrieve the connecting railroad in O(1).
- **Use the new API in `TrainStation` and `Railroad`**
- `TrainStation.removeNeighboringRails(station)` now calls
`removeRailroad(toRemove)` instead of manually deleting from the set,
ensuring the map stays in sync.
- `Railroad.delete(game)` now calls `from.removeRailroad(this)` and
`to.removeRailroad(this)` instead of mutating the sets directly.
- **Refactor `getOrientedRailroad` to use O(1) lookup**
- Replaced a linear scan over `from.getRailroads()` with a direct
lookup:
```ts
export function getOrientedRailroad(
from: TrainStation,
to: TrainStation,
): OrientedRailroad | null {
const railroad = from.getRailroadTo(to);
if (!railroad) return null;
// If tiles are stored from -> to, we go forward when railroad.to === to
const forward = railroad.to === to;
return new OrientedRailroad(railroad, forward);
}
```
- Behavior is preserved:
- `getRailroadTo` returns the same `Railroad` instance that was
previously found by scanning `getRailroads()`.
- Direction (`forward` vs reversed) is still derived from the
`Railroad.from` / `.to` fields in the same way as before.
### Motivation
- `getOrientedRailroad` and upcoming logic both need to resolve “the
railroad between station A and station B” frequently.
- The old pattern (`for (const railroad of from.getRailroads()) { ...
}`) was:
- O(degree) per lookup,
- Repeated in multiple places,
- Harder to maintain as more features (like fare-based costs) touch this
code.
- Centralizing edge lookup in a dedicated `railroadByNeighbor` map makes
this:
- **O(1)** per lookup,
- Less error-prone (one source of truth),
- Easier to reuse from new systems (e.g. train pathfinding, fare-aware
logic).
### Impact / Risk
- **Public behavior:** No functional change in how railroads are
created, deleted, or oriented; only the lookup mechanism changed.
- **Internal invariants:** Correctness relies on:
- All railroad creations using `addRailroad` on both endpoints (already
true via `RailNetworkImpl.connect`).
- All removals (`Railroad.delete`,
`TrainStation.removeNeighboringRails`, `disconnectFromNetwork`) using
`removeRailroad` / `clearRailroads`, which this PR updates.
- **Tests:** Existing `TrainStation` tests still pass; they exercise
`addRailroad`, `removeNeighboringRails`, and `getRailroads()`, which
continue to behave the same from the outside.
## Please complete the following:
- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
## Please put your Discord username so you can be contacted if a bug or
regression is found:
DISCORD_USERNAME
## Description:
Team games have been too fast because teammates can create large
networks. Reduce the bonus from 50k=>25k
## Please complete the following:
- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
## Please put your Discord username so you can be contacted if a bug or
regression is found:
evan
## Description:
v25 meta update:
- Trade ship spawn rate is determined by number of ports players has and
total number of tradeships on the map
- Train spawn rate scales hyperbolically with number of factories owned
by player
- Factory & Port share the same early unit discount (eg building a port
makes the factory more expensive), this is to encourage more
specialization: become a naval economy or land based economy.
- Trains spawn from factories and arrive on cities
- Trains only give gold on cities
- Trains give 50k gold for allies, 25k for nonallies, and 10k for self
- Large players are given a 30% speed/attack debuff in sigmoid curve
- Reduced attack bonus for large players
- Nerf bot gold production from 1k/s => 500/s
- Nerf bot max troops
## Please complete the following:
- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
## Please put your Discord username so you can be contacted if a bug or
regression is found:
evan
## Description:
During the play test, trains did not produce enough gold. So increase
gold, and give 4x bonus for allies.
## Please complete the following:
- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I have read and accepted the CLA agreement (only required once).
## Please put your Discord username so you can be contacted if a bug or
regression is found:
evan
## Description:
I think it makes sense to allow trains between non-allies, but give a
bonus to land trade between players who are allies.
## Please complete the following:
- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I have read and accepted the CLA agreement (only required once).
## Please put your Discord username so you can be contacted if a bug or
regression is found:
evan
## Description:
This update encourages alliances by modifying how train-based trading
works. Trading is now restricted to allied networks, and allied trades
offer better rewards than self-trades, incentivizing cooperation.
Changes:
- Train destinations are now limited to stations owned by the player or
their allies.
- Delivering a train to one’s own station grants 4,000 gold.
- Delivering a train to an ally’s station grants 5,000 gold to both the
sender and the receiver.
This system encourages players to form alliances, especially with
factory-focused players.
## Please complete the following:
- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I have read and accepted the CLA agreement (only required once).
## Please put your Discord username so you can be contacted if a bug or
regression is found:
IngloriousTom
## Description:
- Change trains so it spawns from factories only
- Increase train frequency as they will now spawn from a single
structure.
- Factory will spawn more trains depending on its level
- Fix port to connect to nearby railroads
- Add factory description
## Please complete the following:
- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors
## Please put your Discord username so you can be contacted if a bug or
regression is found:
IngloriousTom
---------
Co-authored-by: Tom Rouillard <trouilla@mathworks.com>
Co-authored-by: evanpelle <evanpelle@gmail.com>
## Description:
Train stations are now built automatically when a factory is
constructed.
Changes:
- When a factory is built, nearby structures are connected to the rail
network
- When a city is built near a factory, it is connected to the rail
network
- All structures behave the same when a train stops: to be defined
- Removed station badge
- Gold income is now related to the structure's level
## Please complete the following:
- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors
## Please put your Discord username so you can be contacted if a bug or
regression is found:
IngloriousTom
## Description:
Add a text popup FX when a tradeship lands in your port.
They are only displayed for the current player.
https://github.com/user-attachments/assets/586ded57-5311-4394-a322-903ecea89bd6
## Please complete the following:
- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors
## Please put your Discord username so you can be contacted if a bug or
regression is found:
IngloriousTom
---------
Co-authored-by: Tom Rouillard <trouilla@mathworks.com>
Co-authored-by: evanpelle <evanpelle@gmail.com>
## Description:
Add a rail network to handle train stations/railroad between structures.
Changes:
- `RailNetwork` is responsible for the train station graph. Use it to
connect new `TrainStations`
- A `RailRoad` connects two `TrainStation`
- No loop possible in the rail network
- Train stations handles its railroads
- Added a layer to draw the railroads under the structures
#### Clusters
- To speed up computations, each `TrainStation` references its own
cluster
- A cluster is a list of `TrainStation` connected with each other,
created by the `RailNetwork` when connecting the station
- Train stations spawn trains randomly depending on its current cluster
size
- A `TrainStation` decides randomly of the train destination by picking
one from the cluster
#### Production building:
- Added a factory which has no gameplay impact currently. _To be
discussed._
#### Train stops:
- When a train reaches a factory, it's filled with a "cargo". The loaded
trains has no impact currently. _To be discussed._
- When a train reaches a city, the player earn 10k gold
- When a train reaches a port, it sends a new tradeship if possible
- If a destination/source is destroyed, the train & railroad are deleted
too
https://github.com/user-attachments/assets/42375c17-9e04-4a42-98d0-708c81ffd609https://github.com/user-attachments/assets/fbecdb53-a516-4df8-87fb-1f9a62c4efa0
## Please complete the following:
- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors
## Please put your Discord username so you can be contacted if a bug or
regression is found:
IngloriousTom
---------
Co-authored-by: Scott Anderson <scottanderson@users.noreply.github.com>
