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AI doesn't settle very unfavorable locations (#11305)

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* AI doesn't settle locations with less than 50 value

* Settlers try and found cities at a distance of 7 more

* Reduced the value of being on the coast

* RankTile quits early if the tile is already owned
This commit is contained in:
Oskar Niesen
2024-05-15 23:02:20 -05:00
committed by GitHub
parent 1fed88acf6
commit d4cfd4e563
3 changed files with 29 additions and 18 deletions
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39
core/src/com/unciv/logic/automation/unit/CityLocationTileRanker.kt
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@ -4,6 +4,7 @@ import com.unciv.logic.automation.Automation
import com.unciv.logic.city.City
import com.unciv.logic.civilization.Civilization
import com.unciv.logic.civilization.diplomacy.DiplomacyFlags
import com.unciv.logic.map.HexMath
import com.unciv.logic.map.mapunit.MapUnit
import com.unciv.logic.map.tile.Tile
import com.unciv.models.ruleset.tile.ResourceType
@ -21,7 +22,7 @@ object CityLocationTileRanker {
/**
* Returns a hashmap of tiles to their ranking plus the a the highest value tile and its value
*/
fun getBestTilesToFoundCity(unit: MapUnit, distanceToSearch: Int? = null): BestTilesToFoundCity {
fun getBestTilesToFoundCity(unit: MapUnit, distanceToSearch: Int? = null, minimumValue: Float): BestTilesToFoundCity {
val range = if (distanceToSearch != null) distanceToSearch else {
val distanceFromHome = if (unit.civ.cities.isEmpty()) 0
else unit.civ.cities.minOf { it.getCenterTile().aerialDistanceTo(unit.getTile()) }
@ -39,10 +40,11 @@ object CityLocationTileRanker {
val possibleTileLocationsWithRank = possibleCityLocations
.map {
val tileValue = rankTileToSettle(it, unit.civ, nearbyCities, baseTileMap, uniqueCache)
if (tileValue >= minimumValue)
bestTilesToFoundCity.tileRankMap[it] = tileValue
Pair(it, tileValue)
}
}.filter { it.second >= minimumValue }
.sortedByDescending { it.second }
val bestReachableTile = possibleTileLocationsWithRank.firstOrNull { unit.movement.canReach(it.first) }
@ -85,7 +87,7 @@ object CityLocationTileRanker {
// Only count a luxary resource that we don't have yet as unique once
val newUniqueLuxuryResources = HashSet<String>()
if (onCoast) tileValue += 15
if (onCoast) tileValue += 8
if (newCityTile.isAdjacentToRiver()) tileValue += 10
if (newCityTile.terrainHasUnique(UniqueType.FreshWater)) tileValue += 5
// We want to found the city on an oasis because it can't be improved otherwise
@ -93,11 +95,16 @@ object CityLocationTileRanker {
// If we build the city on a resource tile, then we can't build any special improvements on it
if (newCityTile.resource != null) tileValue -= 4
var tiles = 0
for (i in 0..3) {
for (nearbyTile in newCityTile.getTilesAtDistance(i)) {
tiles++
tileValue += rankTile(nearbyTile, civ, onCoast, newUniqueLuxuryResources, baseTileMap, uniqueCache)
}
}
// Placing cities on the edge of the map is bad, we can't even build improvements on them!
tileValue -= (HexMath.getNumberOfTilesInHexagon(3) - tiles) * 3
return tileValue
}
@ -111,35 +118,37 @@ object CityLocationTileRanker {
// If it is not higher the settler may get stuck when it ranks the same tile differently
// as it moves away from the city and doesn't include it in the calculation
// and values it higher than when it moves closer to the city
distanceToCity == 6 -> 2f
distanceToCity == 5 -> 5f
distanceToCity == 4 -> 10f
distanceToCity == 3 -> 15f
distanceToCity < 3 -> 25f // Even if it is a mod that lets us settle closer, lets still not do it
distanceToCity == 7 -> 5f // Perfect location, there aren't any unused tiles in between
distanceToCity == 6 -> -4f
distanceToCity == 5 -> -8f
distanceToCity == 4 -> -20f
distanceToCity == 3 -> -25f
distanceToCity < 3 -> -30f // Even if it is a mod that lets us settle closer, lets still not do it
else -> 0f
}
// Bigger cities will expand more so we want to stay away from them
// Reduces the chance that we don't settle at the begining
distanceToCityModifier *= when {
city.population.population >= 12 -> 4f
city.population.population >= 8 -> 3f
city.population.population >= 3 -> 2f
city.population.population >= 12 -> 2f
city.population.population >= 8 -> 1.5f
city.population.population >= 3 -> 1.2f
else -> 1f
}
// It is worse to settle cities near our own compare to near another civ
// Do not settle near our capital unless really necessary
// Having a strong capital is esential to constructing wonders
if (city.civ == civ) distanceToCityModifier *= if (city.isCapital()) 5 else 2
modifier -= distanceToCityModifier
if (city.civ == civ) distanceToCityModifier *= if (city.isCapital()) 2 else 1
modifier += distanceToCityModifier
}
return modifier
}
private fun rankTile(rankTile: Tile, civ: Civilization, onCoast: Boolean, newUniqueLuxuryResources: HashSet<String>,
baseTileMap: HashMap<Tile, Float>, uniqueCache: LocalUniqueCache): Float {
if (rankTile.getCity() != null) return -1f
var locationSpecificTileValue = 0f
// Don't settle near but not on the coast
if (rankTile.isCoastalTile() && !onCoast) locationSpecificTileValue -= 10
if (rankTile.isCoastalTile() && !onCoast) locationSpecificTileValue -= 2
// Apply the effect of having a lighthouse, since we can probably assume that we will build it
if (onCoast && rankTile.isOcean) locationSpecificTileValue += 1
// Check if there are any new unique luxury resources
@ -154,6 +163,8 @@ object CityLocationTileRanker {
if (rankTile.getOwner() != null && rankTile.getOwner() != civ) return 0f
var rankTileValue = Automation.rankStatsValue(rankTile.stats.getTileStats(null, civ, uniqueCache), civ)
// We can't build improvements on water tiles without resources
if (!rankTile.isLand) rankTileValue -= 1
if (rankTile.resource != null) {
rankTileValue += when (rankTile.tileResource.resourceType) {

4
core/src/com/unciv/logic/automation/unit/SpecificUnitAutomation.kt
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@ -107,7 +107,7 @@ object SpecificUnitAutomation {
// It's possible that we'll see a tile "over the sea" that's better than the tiles close by, but that's not a reason to abandon the close tiles!
// Also this lead to some routing problems, see https://github.com/yairm210/Unciv/issues/3653
val bestTilesInfo = CityLocationTileRanker.getBestTilesToFoundCity(unit, rangeToSearch)
val bestTilesInfo = CityLocationTileRanker.getBestTilesToFoundCity(unit, rangeToSearch, 50f)
var bestCityLocation: Tile? = null
if (unit.civ.gameInfo.turns == 0 && unit.civ.cities.isEmpty() && bestTilesInfo.tileRankMap.containsKey(unit.getTile())) { // Special case, we want AI to settle in place on turn 1.
@ -133,7 +133,7 @@ object SpecificUnitAutomation {
// If the tile we are currently on is close to the best tile, then lets just settle here instead
if (bestTilesInfo.tileRankMap.containsKey(unit.getTile())
&& (bestTilesInfo.bestTile == null || bestTilesInfo.tileRankMap[unit.getTile()]!! >= bestTilesInfo.bestTileRank - 10)) {
&& (bestTilesInfo.bestTile == null || bestTilesInfo.tileRankMap[unit.getTile()]!! >= bestTilesInfo.bestTileRank - 2)) {
bestCityLocation = unit.getTile()
}

2
core/src/com/unciv/ui/screens/worldscreen/WorldMapHolder.kt
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@ -858,7 +858,7 @@ class WorldMapHolder(
// Highlight best tiles for city founding
if (unit.hasUnique(UniqueType.FoundCity)
&& UncivGame.Current.settings.showSettlersSuggestedCityLocations) {
CityLocationTileRanker.getBestTilesToFoundCity(unit).tileRankMap.asSequence()
CityLocationTileRanker.getBestTilesToFoundCity(unit, minimumValue = 50f).tileRankMap.asSequence()
.filter { it.key.isExplored(unit.civ) }.sortedByDescending { it.value }.take(3).forEach {
tileGroups[it.key]!!.layerOverlay.showGoodCityLocationIndicator()
}