From 67e8f7531809f48bad7dd92bc6f28f63bd7cbd21 Mon Sep 17 00:00:00 2001
From: madmaxoft <github@xoft.cz>
Date: Fri, 6 Sep 2013 00:04:49 +0200
Subject: Implemented SteerVehicle packet.

---
 source/Entities/Entity.cpp | 33 +++++++++++++++++++++++++++------
 source/Entities/Entity.h   |  2 ++
 2 files changed, 29 insertions(+), 6 deletions(-)

(limited to 'source/Entities')

diff --git a/source/Entities/Entity.cpp b/source/Entities/Entity.cpp
index 56fd36a05..4066e81ab 100644
--- a/source/Entities/Entity.cpp
+++ b/source/Entities/Entity.cpp
@@ -546,22 +546,24 @@ void cEntity::HandlePhysics(float a_Dt, cChunk & a_Chunk)
 		}
 		else
 		{
+			// TODO: This condition belongs to minecarts, without it, they derails too much.
+			// But it shouldn't be here for other entities. We need a complete minecart physics overhaul.
 			if (
-				(BlockBelow != E_BLOCK_RAIL) && 
-				(BlockBelow != E_BLOCK_DETECTOR_RAIL) && 
-				(BlockBelow != E_BLOCK_POWERED_RAIL) && 
+				(BlockBelow != E_BLOCK_RAIL) &&
+				(BlockBelow != E_BLOCK_DETECTOR_RAIL) &&
+				(BlockBelow != E_BLOCK_POWERED_RAIL) &&
 				(BlockBelow != E_BLOCK_ACTIVATOR_RAIL)
-				)
+			)
 			{
 				// Friction
 				if (NextSpeed.SqrLength() > 0.0004f)
 				{
-					NextSpeed.x *= 0.7f / (1 + a_Dt);
+					NextSpeed.x *= 0.6666;
 					if (fabs(NextSpeed.x) < 0.05)
 					{
 						NextSpeed.x = 0;
 					}
-					NextSpeed.z *= 0.7f / (1 + a_Dt);
+					NextSpeed.z *= 0.6666;
 					if (fabs(NextSpeed.z) < 0.05)
 					{
 						NextSpeed.z = 0;
@@ -1225,6 +1227,25 @@ void cEntity::AddSpeedZ(double a_AddSpeedZ)
 
 
 
+void cEntity::SteerVehicle(float a_Forward, float a_Sideways)
+{
+	if (m_AttachedTo == NULL)
+	{
+		return;
+	}
+	if ((a_Forward != 0) || (a_Sideways != 0))
+	{
+		Vector3d LookVector = GetLookVector();
+		double AddSpeedX = LookVector.x * a_Forward + LookVector.z * a_Sideways;
+		double AddSpeedZ = LookVector.z * a_Forward - LookVector.x * a_Sideways;
+		m_AttachedTo->AddSpeed(AddSpeedX, 0, AddSpeedZ);
+	}
+}
+
+
+
+
+
 //////////////////////////////////////////////////////////////////////////
 // Get look vector (this is NOT a rotation!)
 Vector3d cEntity::GetLookVector(void) const
diff --git a/source/Entities/Entity.h b/source/Entities/Entity.h
index 2d058abae..b4777d249 100644
--- a/source/Entities/Entity.h
+++ b/source/Entities/Entity.h
@@ -185,6 +185,8 @@ public:
 	void AddSpeedX  (double a_AddSpeedX);
 	void AddSpeedY  (double a_AddSpeedY);
 	void AddSpeedZ  (double a_AddSpeedZ);
+	
+	void SteerVehicle(float a_Forward, float a_Sideways);
 
 	inline int  GetUniqueID(void) const { return m_UniqueID; }
 	inline bool IsDestroyed(void) const { return !m_IsInitialized; }
-- 
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