# HG changeset patch
# User celestar
# Date 1173823403 0
# Node ID 7cf72895ca8c0af80c59ba26f6b35a30097b7409
# Parent  3d32aa4ae67c5acacd5d40f56820c5439fe3cdcc
(svn r9152) [gamebalance] -Add: Towns now have an economic activity level so that poorer and richer towns can occur on the map

diff -r 3d32aa4ae67c -r 7cf72895ca8c src/economy_new.cpp
--- a/src/economy_new.cpp	Tue Mar 13 21:49:33 2007 +0000
+++ b/src/economy_new.cpp	Tue Mar 13 22:03:23 2007 +0000
@@ -3,11 +3,38 @@
 /** @file */
 
 #include "economy_new.h"
+#include "town.h"
 
 /** The global economy */
 CEconomy *_eco;
 
 /**
+ * Adjust the global activity level by the cumulative activity level of all towns.
+ * This is to iron out the difference between the sum of all economic activites of
+ * all towns and the the product of the economic activity per capita times the
+ * population of the map.
+ */
+void CEconomy::AdjustActivityByTowns()
+{
+	Town *t;
+	FixedT<int64, 16> total_activity = 0;
+	FixedT<int64, 16> old_activity = m_activity_level;
+
+	FOR_ALL_TOWNS(t) {
+		total_activity += (t->GetActivity() * t->population * m_activity_level);
+		DEBUG(eco, 6, "Obtained EAL of %f, total %f", (double)t->GetActivity());
+	}
+
+	DEBUG(eco, 5, "Global EAL is             %f", (double)m_activity_level * GetWorldPopulation());
+	DEBUG(eco, 5, "Total EAL of all towns is %f", (double)total_activity);
+
+	m_activity_level = total_activity / GetWorldPopulation();
+	DEBUG(eco, 4, "Adjusting global EAL to %f (ratio %f)", (double)m_activity_level, (double)(m_activity_level/old_activity));
+
+	FOR_ALL_TOWNS(t) t->SetActivity(t->GetActivity() * old_activity / m_activity_level);
+}
+
+/**
  * Starts a new economy. As there can always be only one economy in place,
  * deletes the one that is currently active
  */
diff -r 3d32aa4ae67c -r 7cf72895ca8c src/economy_new.h
--- a/src/economy_new.h	Tue Mar 13 21:49:33 2007 +0000
+++ b/src/economy_new.h	Tue Mar 13 22:03:23 2007 +0000
@@ -1,6 +1,9 @@
 /* $Id$ */
 
-/** @file */
+/**
+ * @file economy_new.h
+ * Definition file for the economy of the game.
+ */
 
 #ifndef ECONOMY_NEW_H
 #define ECONOMY_NEW_H
@@ -17,6 +20,25 @@
 class EconomicObject {
 protected:
 	FixedT<int64, 16> m_activity_level;   ///< Economic Activity Level, an indicator for the GDP per capita of the map
+
+public:
+	/**
+	 * Destructors for EconomicObjects. It is virtual because at least one of the methods
+	 * (or member functions) is virtual; thus a non-virtual destructor will cause a
+	 * compiler warning
+	 */
+	virtual ~EconomicObject() {}
+
+	/**
+	 * Used to set the activity level from outside
+	 */
+	virtual void SetActivity() {}
+
+	/**
+	 * Obtains the activity level of the object
+	 * @return the economic activity
+	 */
+	FixedT<int64, 16> GetActivity() const { return m_activity_level; }
 };
 
 /**
@@ -87,6 +109,7 @@
 	 */
 	void MonthlyLoop()
 	{
+		AdjustActivityByTowns();
 		/* Modifications of the global economic activity one-tenth of a percent */
 		static const int RandomEvents[] = {-1, 1, -2, 2, -5, 5, -10, 10, -12, 12, -15, 15, -20, 20, -25, 25, 32, -32, 50, -50, -100};
 		/* I didn't use the 19, because it hardly ever is the return of RandomRange for whatever reason */
@@ -97,8 +120,11 @@
 
 		m_activity_level *= mod;
 		DEBUG(eco, 5, "Added a random event with a value of %f, adjusted EAL to %f", (double)mod, (double)m_activity_level);
+
 	}
 
+	void AdjustActivityByTowns();
+
 private:
 	/**
 	 * Computes the modification of economic growth by cyclic events
diff -r 3d32aa4ae67c -r 7cf72895ca8c src/town.h
--- a/src/town.h	Tue Mar 13 21:49:33 2007 +0000
+++ b/src/town.h	Tue Mar 13 22:03:23 2007 +0000
@@ -5,12 +5,13 @@
 
 #include "oldpool.h"
 #include "player.h"
+#include "economy_new.h"
 
 enum {
 	INVALID_TOWN = 0xFFFF,
 };
 
-struct Town {
+struct Town : EconomicObject {
 	TileIndex xy;
 
 	// Current population of people and amount of houses.
@@ -78,6 +79,18 @@
 
 	// NOSAVE: UpdateTownRadius updates this given the house count.
 	uint16 radius[5];
+
+	/**
+	 * Sets the economic activity level of a town
+	 * @param level The activity level
+	 */
+	/* virtual */
+	template <typename T>
+	void SetActivity(T level)
+	{
+		DEBUG(eco, 7, "Setting EAL of town %d [0x%x], to %f", index, xy, (double)level);
+		m_activity_level = level;
+	}
 };
 
 uint32 GetWorldPopulation(void);
diff -r 3d32aa4ae67c -r 7cf72895ca8c src/town_cmd.cpp
--- a/src/town_cmd.cpp	Tue Mar 13 21:49:33 2007 +0000
+++ b/src/town_cmd.cpp	Tue Mar 13 22:03:23 2007 +0000
@@ -962,6 +962,9 @@
 	t->exclusive_counter = 0;
 	t->statues = 0;
 
+	FixedT<int32, 16> activity = 1;
+
+	t->SetActivity(activity);
 	t->townnametype = SPECSTR_TOWNNAME_START + _opt.town_name;
 	t->townnameparts = townnameparts;
 
@@ -1113,6 +1116,7 @@
 		}
 	}
 
+	_eco->AdjustActivityByTowns();
 	return true;
 }