Player Xp

CONTRIBUTORS

@@ -12,5 +12,6 @@ rs2k
 Duralex 	
 mtilden
 Luksor
+marmot
 
 Please add yourself to this list if you contribute to MCServer.

source/Defines.h

@@ -44,6 +44,9 @@ extern bool g_BlockIsSolid[256];
 /// Can torches be placed on this block?
 extern bool g_BlockIsTorchPlaceable[256];
 
+/// Max Erperience that possible to be incremented at once
+#define MAX_EXPERIENCE_ORB_SIZE 2000 //ie from a ender dragon
+
 
 
 

source/Entities/Player.cpp

@@ -1,4 +1,4 @@
-
+
 #include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
 
 #include "Player.h"
@@ -33,6 +33,7 @@
 
 
 
+
 cPlayer::cPlayer(cClientHandle* a_Client, const AString & a_PlayerName)
 	: super(etPlayer, 0.6, 1.8)
 	, m_GameMode(eGameMode_NotSet)
@@ -65,6 +66,10 @@ cPlayer::cPlayer(cClientHandle* a_Client, const AString & a_PlayerName)
 	, m_EatingFinishTick(-1)
 	, m_IsChargingBow(false)
 	, m_BowCharge(0)
+	, m_XpLevel(0)
+	, m_XpP(0.f)
+	, m_XpTotal(0)
+	, m_XpNextLevelTotal(0)
 {
 	LOGD("Created a player object for \"%s\" @ \"%s\" at %p, ID %d", 
 		a_PlayerName.c_str(), a_Client->GetIPString().c_str(),
@@ -260,6 +265,67 @@ void cPlayer::Tick(float a_Dt, cChunk & a_Chunk)
 
 
 
+bool cPlayer::SetExperience(int a_XpTotal)
+{
+	if(!(a_XpTotal >= 0) || (a_XpTotal > (INT_MAX - m_XpTotal)))
+	{
+		LOGWARNING("Tried to update experiece with an invalid Xp value: %d", a_XpTotal);
+		return false; //oops, they gave us a dodgey number
+	}
+
+
+	m_XpTotal = a_XpTotal;
+
+	//now calculate XpP and XpLevel
+	//First Calc current level using quadratic eqn
+	m_XpLevel = CalcLevelFromXp(m_XpTotal);
+
+	//calculate total Xp for next level
+	m_XpNextLevelTotal = XpAtLevel(m_XpLevel+1);
+
+	//calulate Xp Percentage
+	m_XpP = (float)m_XpLevel / (float)m_XpNextLevelTotal;
+
+	return true;//aka happy :)
+}
+
+
+
+
+
+bool cPlayer::AddExperience(int a_Xp_delta)
+{
+	if(a_Xp_delta > MAX_EXPERIENCE_ORB_SIZE || a_Xp_delta < 0)
+	{
+		//value was too large or negative, abort and report
+		LOGWARNING("Attempt was made to increment Xp by %d, max is %d and must be positive",
+			a_Xp_delta, MAX_EXPERIENCE_ORB_SIZE);
+		return false;
+	}
+	
+	LOGD("Player \"%s\" earnt %d experience", m_PlayerName.c_str(), a_Xp_delta);
+
+	//update Xp, note there is no min
+	m_XpTotal += a_Xp_delta;
+
+	//update Xp percentage
+	if(m_XpTotal >= m_XpNextLevelTotal)
+	{
+		//oh actually, update their level first
+
+		m_XpLevel++;
+		m_XpNextLevelTotal = XpAtLevel(m_XpLevel+1);
+	}
+
+	m_XpP = (float)m_XpLevel / (float)m_XpNextLevelTotal;
+
+	return true;
+}
+
+
+
+
+
 void cPlayer::StartChargingBow(void)
 {
 	LOGD("Player \"%s\" started charging their bow", m_PlayerName.c_str());
@@ -1268,7 +1334,7 @@ bool cPlayer::LoadFromDisk()
 	cFile f;
 	if (!f.Open(SourceFile, cFile::fmRead))
 	{
-		// This is a new player whom we haven't seen yet, bail out, let them have the defaults
+		// This is a new player whom we haven't seen yet, bail, let them have the defaults
 		return false;
 	}
 
@@ -1278,7 +1344,7 @@ bool cPlayer::LoadFromDisk()
 		LOGWARNING("Cannot read player data from file \"%s\"", SourceFile.c_str()); 
 		return false;
 	}
-	f.Close();
+	f.Close(); //cool kids play nice
 
 	Json::Value root;
 	Json::Reader reader;
@@ -1308,6 +1374,7 @@ bool cPlayer::LoadFromDisk()
 	}
 
 	m_Health = root.get("health", 0).asInt();
+	m_XpLevel             = root.get("experience",     0).asInt();
 	m_AirLevel            = root.get("air",            MAX_AIR_LEVEL).asInt();
 	m_FoodLevel           = root.get("food",           MAX_FOOD_LEVEL).asInt();
 	m_FoodSaturationLevel = root.get("foodSaturation", MAX_FOOD_LEVEL).asDouble();
@@ -1354,6 +1421,7 @@ bool cPlayer::SaveToDisk()
 	root["rotation"]       = JSON_PlayerRotation;
 	root["inventory"]      = JSON_Inventory;
 	root["health"]         = m_Health;
+	root["experience"]     = m_XpTotal;
 	root["air"]            = m_AirLevel;
 	root["food"]           = m_FoodLevel;
 	root["foodSaturation"] = m_FoodSaturationLevel;

source/Entities/Player.h

@@ -64,6 +64,27 @@ public:
 	/// Returns the currently equipped boots; empty item if none
 	virtual cItem GetEquippedBoots(void) const override { return m_Inventory.GetEquippedBoots(); }
 
+	/** Sets the experience total - XpTotal, updates XpLevel and XpP as appropriate
+	Returns true on success
+	should really only be called at init or player death
+	*/
+	bool SetExperience(int a_XpTotal);
+
+	/* Adds Xp, will not inc more than MAX_EXPERIENCE_ORB_SIZE!
+	Returns true on success
+	Updates XpLevel and XpP appropriately
+	*/
+	bool AddExperience(int a_Xp_delta);
+
+	/// Gets the experience total - XpTotal
+	inline int GetExperience(void) { return m_XpTotal; }
+
+	/// Gets the current level - XpLevel
+	inline int GetExperienceLevel(void) { return m_XpLevel; }
+
+	/// Gets the experience bar percentage - XpP
+	inline float GetExperiencePercentage(void) { return m_XpP; }
+	
 	/// Starts charging the equipped bow
 	void StartChargingBow(void);
 	
@@ -379,6 +400,27 @@ protected:
 	/// The world tick in which eating will be finished. -1 if not eating
 	Int64 m_EatingFinishTick;
 
+	/// Player Xp levels etc
+	int m_XpLevel; //store this and m_XpP to save calculating each time
+	float m_XpP; //between 0 & 1
+	int m_XpTotal;
+	int m_XpNextLevelTotal; //save calculating this often
+
+	//Xp level defines
+	#define XP_TO_LEVEL15 255
+	#define XP_PER_LEVEL_TO15 17
+	#define XP_TO_LEVEL30 825
+
+	/// Caculates the Xp at a given level, ref: http://minecraft.gamepedia.com/XP
+	inline int XpAtLevel(int level) { return (int) ((level <= 15)? (15*level) : 
+		((level <= 31)? (1.5*level*level - 29.5*level + 360) : 
+		(3.5*level*level - 151.5*level + 2220))); }
+
+	/// inverse of XpAtLevel, ref: http://minecraft.gamepedia.com/XP values are as per this with pre-calculations
+	inline int CalcLevelFromXp(int XpTotal) { return (int) ((XpTotal <= XP_TO_LEVEL15)? XpTotal / XP_PER_LEVEL_TO15 : //level 0-15 or...
+		(XpTotal <= XP_TO_LEVEL30)? ( 29.5 + sqrt( 870.25 - (6 * ( 360 - XpTotal )))) / 3 : //level 15-30
+		(151.5 + sqrt( 22952.25 - (14 * (2220 - XpTotal)))) / 7); }//level 30+
+	
 	bool m_IsChargingBow;
 	int  m_BowCharge;