Scale displayed running costs by day length factor

src/build_vehicle_gui.cpp

@@ -586,7 +586,7 @@ static int DrawRailWagonPurchaseInfo(int left, int right, int y, EngineID engine
 
 	/* Running cost */
 	if (rvi->running_cost_class != INVALID_PRICE) {
-		SetDParam(0, e->GetRunningCost());
+		SetDParam(0, e->GetDisplayRunningCost());
 		DrawString(left, right, y, STR_PURCHASE_INFO_RUNNINGCOST);
 		y += FONT_HEIGHT_NORMAL;
 	}
@@ -620,7 +620,7 @@ static int DrawRailEnginePurchaseInfo(int left, int right, int y, EngineID engin
 
 	/* Running cost */
 	if (rvi->running_cost_class != INVALID_PRICE) {
-		SetDParam(0, e->GetRunningCost());
+		SetDParam(0, e->GetDisplayRunningCost());
 		DrawString(left, right, y, STR_PURCHASE_INFO_RUNNINGCOST);
 		y += FONT_HEIGHT_NORMAL;
 	}
@@ -674,7 +674,7 @@ static int DrawRoadVehPurchaseInfo(int left, int right, int y, EngineID engine_n
 	}
 
 	/* Running cost */
-	SetDParam(0, e->GetRunningCost());
+	SetDParam(0, e->GetDisplayRunningCost());
 	DrawString(left, right, y, STR_PURCHASE_INFO_RUNNINGCOST);
 	y += FONT_HEIGHT_NORMAL;
 
@@ -717,7 +717,7 @@ static int DrawShipPurchaseInfo(int left, int right, int y, EngineID engine_numb
 	y += FONT_HEIGHT_NORMAL;
 
 	/* Running cost */
-	SetDParam(0, e->GetRunningCost());
+	SetDParam(0, e->GetDisplayRunningCost());
 	DrawString(left, right, y, STR_PURCHASE_INFO_RUNNINGCOST);
 	y += FONT_HEIGHT_NORMAL;
 
@@ -764,7 +764,7 @@ static int DrawAircraftPurchaseInfo(int left, int right, int y, EngineID engine_
 	y += FONT_HEIGHT_NORMAL;
 
 	/* Running cost */
-	SetDParam(0, e->GetRunningCost());
+	SetDParam(0, e->GetDisplayRunningCost());
 	DrawString(left, right, y, STR_PURCHASE_INFO_RUNNINGCOST);
 	y += FONT_HEIGHT_NORMAL;
 

src/engine.cpp

@@ -30,6 +30,7 @@
 #include "company_base.h"
 #include "vehicle_func.h"
 #include "articulated_vehicles.h"
+#include "settings_type.h"
 #include "error.h"
 
 #include "table/strings.h"
@@ -277,6 +278,15 @@ uint Engine::DetermineCapacity(const Vehicle *v, uint16 *mail_capacity) const
 	return capacity;
 }
 
+/**
+ * Return display value of how much the running costs of this engine are.
+ * @return Yearly running cost of the engine.
+ */
+Money Engine::GetDisplayRunningCost() const
+{
+	return this->GetRunningCost() * _settings_game.economy.day_length_factor;
+}
+
 /**
  * Return how much the running costs of this engine are.
  * @return Yearly running cost of the engine.

src/engine_base.h

@@ -104,6 +104,7 @@ struct Engine : EnginePool::PoolItem<&_engine_pool> {
 	}
 
 	Money GetRunningCost() const;
+	Money GetDisplayRunningCost() const;
 	Money GetCost() const;
 	uint GetDisplayMaxSpeed() const;
 	uint GetPower() const;

src/engine_gui.cpp

@@ -174,7 +174,7 @@ static StringID GetTrainEngineInfoString(const Engine *e)
 	SetDParam(1, e->GetDisplayWeight());
 	SetDParam(7, e->GetDisplayMaxTractiveEffort());
 
-	SetDParam(4, e->GetRunningCost());
+	SetDParam(4, e->GetDisplayRunningCost());
 
 	uint capacity = GetTotalCapacityOfArticulatedParts(e->index);
 	if (capacity != 0) {
@@ -204,10 +204,10 @@ static StringID GetAircraftEngineInfoString(const Engine *e)
 	if (mail_capacity > 0) {
 		SetDParam(i++, CT_MAIL);
 		SetDParam(i++, mail_capacity);
-		SetDParam(i++, e->GetRunningCost());
+		SetDParam(i++, e->GetDisplayRunningCost());
 		return range > 0 ? STR_ENGINE_PREVIEW_COST_MAX_SPEED_TYPE_RANGE_CAP_CAP_RUNCOST : STR_ENGINE_PREVIEW_COST_MAX_SPEED_TYPE_CAP_CAP_RUNCOST;
 	} else {
-		SetDParam(i++, e->GetRunningCost());
+		SetDParam(i++, e->GetDisplayRunningCost());
 		return range > 0 ? STR_ENGINE_PREVIEW_COST_MAX_SPEED_TYPE_RANGE_CAP_RUNCOST : STR_ENGINE_PREVIEW_COST_MAX_SPEED_TYPE_CAP_RUNCOST;
 	}
 }
@@ -224,7 +224,7 @@ static StringID GetRoadVehEngineInfoString(const Engine *e)
 		} else {
 			SetDParam(2, CT_INVALID);
 		}
-		SetDParam(4, e->GetRunningCost());
+		SetDParam(4, e->GetDisplayRunningCost());
 		return STR_ENGINE_PREVIEW_COST_MAX_SPEED_CAP_RUNCOST;
 	} else {
 		SetDParam(0, e->GetCost());
@@ -233,7 +233,7 @@ static StringID GetRoadVehEngineInfoString(const Engine *e)
 		SetDParam(1, e->GetDisplayWeight());
 		SetDParam(7, e->GetDisplayMaxTractiveEffort());
 
-		SetDParam(4, e->GetRunningCost());
+		SetDParam(4, e->GetDisplayRunningCost());
 
 		uint capacity = GetTotalCapacityOfArticulatedParts(e->index);
 		if (capacity != 0) {
@@ -252,7 +252,7 @@ static StringID GetShipEngineInfoString(const Engine *e)
 	SetDParam(1, e->GetDisplayMaxSpeed());
 	SetDParam(2, e->GetDefaultCargoType());
 	SetDParam(3, e->GetDisplayDefaultCapacity());
-	SetDParam(4, e->GetRunningCost());
+	SetDParam(4, e->GetDisplayRunningCost());
 	return STR_ENGINE_PREVIEW_COST_MAX_SPEED_CAP_RUNCOST;
 }
 

src/vehicle_base.h

@@ -572,7 +572,7 @@ public:
 	 * Gets the running cost of a vehicle  that can be sent into SetDParam for string processing.
 	 * @return the vehicle's running cost
 	 */
-	Money GetDisplayRunningCost() const { return (this->GetRunningCost() >> 8); }
+	Money GetDisplayRunningCost() const { return (this->GetRunningCost() >> 8) * _settings_game.economy.day_length_factor; }
 
 	/**
 	 * Gets the profit vehicle had this year. It can be sent into SetDParam for string processing.