Do not compute threats that are too far away to be useful

AI/Nullkiller/Analyzers/DangerHitMapAnalyzer.cpp

@@ -119,7 +119,7 @@ void DangerHitMapAnalyzer::updateHitMap()
 
 		PathfinderSettings ps;
 
-		ps.scoutTurnDistanceLimit = ps.mainTurnDistanceLimit = ai->settings->getMainHeroTurnDistanceLimit();
+		ps.scoutTurnDistanceLimit = ps.mainTurnDistanceLimit = ai->settings->getThreatTurnDistanceLimit();
 		ps.useHeroChain = false;
 
 		ai->pathfinder->updatePaths(pair.second, ps);

AI/Nullkiller/Engine/Settings.cpp

@@ -28,6 +28,7 @@ namespace NKAI
 		: maxRoamingHeroes(8),
 		mainHeroTurnDistanceLimit(10),
 		scoutHeroTurnDistanceLimit(5),
+		threatTurnDistanceLimit(5),
 		maxGoldPressure(0.3f),
 		retreatThresholdRelative(0.3),
 		retreatThresholdAbsolute(10000),

AI/Nullkiller/Engine/Settings.h

@@ -24,6 +24,7 @@ namespace NKAI
 		int maxRoamingHeroes;
 		int mainHeroTurnDistanceLimit;
 		int scoutHeroTurnDistanceLimit;
+		int threatTurnDistanceLimit;
 		int maxPass;
 		int maxPriorityPass;
 		int pathfinderBucketsCount;
@@ -52,6 +53,7 @@ namespace NKAI
 		int getMaxRoamingHeroes() const { return maxRoamingHeroes; }
 		int getMainHeroTurnDistanceLimit() const { return mainHeroTurnDistanceLimit; }
 		int getScoutHeroTurnDistanceLimit() const { return scoutHeroTurnDistanceLimit; }
+		int getThreatTurnDistanceLimit() const { return threatTurnDistanceLimit; }
 		int getPathfinderBucketsCount() const { return pathfinderBucketsCount; }
 		int getPathfinderBucketSize() const { return pathfinderBucketSize; }
 		bool isObjectGraphAllowed() const { return allowObjectGraph; }

config/ai/nkai/nkai-settings.json

@@ -38,6 +38,7 @@
 		"maxPriorityPass" : 10,
 		"mainHeroTurnDistanceLimit" : 10,
 		"scoutHeroTurnDistanceLimit" : 5,
+		"threatTurnDistanceLimit" : 1,
 		"maxGoldPressure" : 0.3,
 		"updateHitmapOnTileReveal" : false,
 		"useTroopsFromGarrisons" : true,
@@ -58,6 +59,7 @@
 		"maxPriorityPass" : 10,
 		"mainHeroTurnDistanceLimit" : 10,
 		"scoutHeroTurnDistanceLimit" : 5,
+		"threatTurnDistanceLimit" : 4,
 		"maxGoldPressure" : 0.3,
 		"updateHitmapOnTileReveal" : false,
 		"useTroopsFromGarrisons" : true,
@@ -78,6 +80,7 @@
 		"maxPriorityPass" : 10,
 		"mainHeroTurnDistanceLimit" : 10,
 		"scoutHeroTurnDistanceLimit" : 5,
+		"threatTurnDistanceLimit" : 5,
 		"maxGoldPressure" : 0.3,
 		"updateHitmapOnTileReveal" : false,
 		"useTroopsFromGarrisons" : true,
@@ -98,6 +101,7 @@
 		"maxPriorityPass" : 10,
 		"mainHeroTurnDistanceLimit" : 10,
 		"scoutHeroTurnDistanceLimit" : 5,
+		"threatTurnDistanceLimit" : 5,
 		"maxGoldPressure" : 0.3,
 		"updateHitmapOnTileReveal" : false,
 		"useTroopsFromGarrisons" : true,
@@ -118,6 +122,7 @@
 		"maxPriorityPass" : 10,
 		"mainHeroTurnDistanceLimit" : 10,
 		"scoutHeroTurnDistanceLimit" : 5,
+		"threatTurnDistanceLimit" : 5,
 		"maxGoldPressure" : 0.3,
 		"updateHitmapOnTileReveal" : false,
 		"useTroopsFromGarrisons" : true,