2 files changed, 112 insertions, 1 deletions

diff --git a/src/Entities/Player.cpp b/src/Entities/Player.cpp
index 33ded6ab9..bede603e2 100644
--- a/src/Entities/Player.cpp
+++ b/src/Entities/Player.cpp
@@ -63,6 +63,7 @@ cPlayer::cPlayer(cClientHandlePtr a_Client, const AString & a_PlayerName) :
 	m_GameMode(eGameMode_NotSet),
 	m_IP(""),
 	m_ClientHandle(a_Client),
+	m_FreezeCounter(-1),
 	m_NormalMaxSpeed(1.0),
 	m_SprintingMaxSpeed(1.3),
 	m_FlyingMaxSpeed(1.0),
@@ -112,6 +113,7 @@ cPlayer::cPlayer(cClientHandlePtr a_Client, const AString & a_PlayerName) :
 
 	m_LastGroundHeight = static_cast<float>(GetPosY());
 	m_Stance = GetPosY() + 1.62;
+	FreezeInternal(GetPosition(), false);  // Freeze. Will be unfrozen once the chunk is loaded
 
 	if (m_GameMode == gmNotSet)
 	{
@@ -220,8 +222,35 @@ void cPlayer::Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
 
 	m_Stats.AddValue(statMinutesPlayed, 1);
 
+	// Handle a frozen player
+	if (m_IsFrozen)
+	{
+		m_FreezeCounter += 1;
+		if (!m_IsManuallyFrozen && a_Chunk.IsValid())
+		{
+			// If the player was automatically frozen, unfreeze if the chunk the player is inside is loaded
+			Unfreeze();
+		}
+		else
+		{
+			// If the player was externally / manually frozen (plugin, etc.) or if the chunk isn't loaded yet:
+			// 1. Set the location to m_FrozenPosition every tick.
+			// 2. Zero out the speed every tick.
+			// 3. Send location updates every 60 ticks.
+			SetPosition(m_FrozenPosition);
+			SetSpeed(0, 0, 0);
+			if (m_FreezeCounter % 60 == 0)
+			{
+				BroadcastMovementUpdate(m_ClientHandle.get());
+				m_ClientHandle->SendPlayerPosition();
+			}
+			return;
+		}
+	}
+
 	if (!a_Chunk.IsValid())
 	{
+		FreezeInternal(GetPosition(), false);
 		// This may happen if the cPlayer is created before the chunks have the chance of being loaded / generated (#83)
 		return;
 	}
@@ -1263,6 +1292,46 @@ void cPlayer::TeleportToCoords(double a_PosX, double a_PosY, double a_PosZ)
 
 
 
+void cPlayer::Freeze(const Vector3d & a_Location)
+{
+	FreezeInternal(a_Location, true);
+}
+
+
+
+
+
+bool cPlayer::IsFrozen()
+{
+	return m_IsFrozen;
+}
+
+
+
+
+
+int cPlayer::GetFrozenDuration()
+{
+	return m_FreezeCounter;
+}
+
+
+
+
+
+void cPlayer::Unfreeze()
+{
+	m_FreezeCounter = -1;
+	m_IsFrozen = false;
+	SetPosition(m_FrozenPosition);
+	BroadcastMovementUpdate(m_ClientHandle.get());
+	m_ClientHandle->SendPlayerPosition();
+}
+
+
+
+
+
 void cPlayer::SendRotation(double a_YawDegrees, double a_PitchDegrees)
 {
 	SetYaw(a_YawDegrees);
@@ -1533,6 +1602,20 @@ void cPlayer::TossItems(const cItems & a_Items)
 }
 
 
+
+
+
+void cPlayer::FreezeInternal(const Vector3d & a_Location, bool a_ManuallyFrozen)
+{
+	m_IsFrozen = true;
+	m_FrozenPosition = a_Location;
+	m_IsManuallyFrozen = a_ManuallyFrozen;
+}
+
+
+
+
+
 bool cPlayer::DoMoveToWorld(cWorld * a_World, bool a_ShouldSendRespawn, Vector3d a_NewPosition)
 {
 	ASSERT(a_World != nullptr);
diff --git a/src/Entities/Player.h b/src/Entities/Player.h
index bff9599f7..10c9106a3 100644
--- a/src/Entities/Player.h
+++ b/src/Entities/Player.h
@@ -138,6 +138,18 @@ public:
 
 	// tolua_begin
 
+	/** Prevent the player from moving and lock him into a_Location. */
+	void Freeze(const Vector3d & a_Location);
+
+	/** Is the player frozen? */
+	bool IsFrozen();
+
+	/** How long has the player been frozen? */
+	int GetFrozenDuration();
+
+	/** Cancels Freeze(...) and allows the player to move naturally. */
+	void Unfreeze();
+
 	/** Sends the "look" packet to the player, forcing them to set their rotation to the specified values.
 	a_YawDegrees is clipped to range [-180, +180),
 	a_PitchDegrees is clipped to range [-180, +180) but the client only uses [-90, +90]
@@ -240,7 +252,7 @@ public:
 	void SendMessageFatal         (const AString & a_Message) { m_ClientHandle->SendChat(a_Message, mtFailure); }
 	void SendMessagePrivateMsg    (const AString & a_Message, const AString & a_Sender) { m_ClientHandle->SendChat(a_Message, mtPrivateMessage, a_Sender); }
 	void SendMessage              (const cCompositeChat & a_Message) { m_ClientHandle->SendChat(a_Message); }
-	
+
 	void SendSystemMessage        (const AString & a_Message) { m_ClientHandle->SendChatSystem(a_Message, mtCustom); }
 	void SendAboveActionBarMessage(const AString & a_Message) { m_ClientHandle->SendChatAboveActionBar(a_Message, mtCustom); }
 	void SendSystemMessage        (const cCompositeChat & a_Message) { m_ClientHandle->SendChatSystem(a_Message); }
@@ -576,6 +588,18 @@ protected:
 
 	cSlotNums m_InventoryPaintSlots;
 
+	/** if m_IsFrozen is true, we lock m_Location to this position. */
+	Vector3d m_FrozenPosition;
+
+	/** If true, we are locking m_Position to m_FrozenPosition. */
+	bool m_IsFrozen;
+
+	/** */
+	int m_FreezeCounter;
+
+	/** Was the player frozen manually by a plugin or automatically by the server? */
+	bool m_IsManuallyFrozen;
+
 	/** Max speed, relative to the game default.
 	1 means regular speed, 2 means twice as fast, 0.5 means half-speed.
 	Default value is 1. */
@@ -661,6 +685,10 @@ protected:
 	/** Tosses a list of items. */
 	void TossItems(const cItems & a_Items);
 
+	/** Pins the player to a_Location until Unfreeze() is called.
+	If ManuallyFrozen is false, the player will unfreeze when the chunk is loaded. */
+	void FreezeInternal(const Vector3d & a_Location, bool a_ManuallyFrozen);
+
 	/** Returns the filename for the player data based on the UUID given.
 	This can be used both for online and offline UUIDs. */
 	AString GetUUIDFileName(const AString & a_UUID);