Add basic support for NPCs on transports; DB data required.

Currently no support for combat while the transport is in motion.
Based on a patch by Socolin.
Fixes issue #168

--HG--
branch : trunk

src/server/game/Entities/Object/Object.cpp

@@ -1151,6 +1151,7 @@ WorldObject::WorldObject()
     , m_name("")
     , m_notifyflags(0), m_executed_notifies(0)
 {
+    m_transport = NULL;
 }
 
 void WorldObject::SetWorldObject(bool on)
@@ -1235,6 +1236,22 @@ float WorldObject::GetDistanceZ(const WorldObject* obj) const
 
 bool WorldObject::_IsWithinDist(WorldObject const* obj, float dist2compare, bool is3D) const
 {
+    float sizefactor = GetObjectSize() + obj->GetObjectSize();
+    float maxdist = dist2compare + sizefactor;
+
+    if (m_transport && obj->GetTransport() &&  obj->GetTransport()->GetGUIDLow() == m_transport->GetGUIDLow())
+    {
+        float dtx = m_movementInfo.t_x - obj->m_movementInfo.t_x;
+        float dty = m_movementInfo.t_y - obj->m_movementInfo.t_y;
+        float disttsq = dtx * dtx + dty * dty;
+        if (is3D)
+        {
+            float dtz = m_movementInfo.t_z - obj->m_movementInfo.t_z;
+            disttsq += dtz * dtz;
+        }
+        return disttsq < (maxdist * maxdist);
+    }
+
     float dx = GetPositionX() - obj->GetPositionX();
     float dy = GetPositionY() - obj->GetPositionY();
     float distsq = dx*dx + dy*dy;
@@ -1243,8 +1260,6 @@ bool WorldObject::_IsWithinDist(WorldObject const* obj, float dist2compare, bool
         float dz = GetPositionZ() - obj->GetPositionZ();
         distsq += dz*dz;
     }
-    float sizefactor = GetObjectSize() + obj->GetObjectSize();
-    float maxdist = dist2compare + sizefactor;
 
     return distsq < maxdist * maxdist;
 }

src/server/game/Entities/Object/Object.h

@@ -115,9 +115,46 @@ class Vehicle;
 class CreatureAI;
 class ZoneScript;
 class Unit;
+class Transport;
 
 typedef UNORDERED_MAP<Player*, UpdateData> UpdateDataMapType;
 
+struct MovementInfo
+{
+    // common
+    uint64 guid;
+    uint32  flags;
+    uint16  unk1;
+    uint32  time;
+    float   x, y, z, o;
+    // transport
+    uint64  t_guid;
+    float   t_x, t_y, t_z, t_o;
+    uint32  t_time;
+    int8    t_seat;
+    // swimming and unknown
+    float   s_pitch;
+    // last fall time
+    uint32  fallTime;
+    // jumping
+    float   j_zspeed, j_sinAngle, j_cosAngle, j_xyspeed;
+    // spline
+    float   u_unk1;
+
+    MovementInfo()
+    {
+        flags = 0;
+        time = t_time = fallTime = 0;
+        unk1 = 0;
+        x = y = z = o = t_x = t_y = t_z = t_o = s_pitch = j_zspeed = j_sinAngle = j_cosAngle = j_xyspeed = u_unk1 = 0.0f;
+        t_guid = 0;
+    }
+
+    uint32 GetMovementFlags() { return flags; }
+    void AddMovementFlag(uint32 flag) { flags |= flag; }
+    bool HasMovementFlag(uint32 flag) const { return flags & flag; }
+};
+
 class Object
 {
     public:
@@ -696,12 +733,21 @@ class WorldObject : public Object, public WorldLocation
 
         bool m_isWorldObject;
         uint32  LastUsedScriptID;
+
+        // Transports
+        Transport *GetTransport() const { return m_transport; }
+        void SetTransport(Transport *t) { m_transport = t; }
+
+        MovementInfo m_movementInfo;
     protected:
         explicit WorldObject();
         std::string m_name;
         bool m_isActive;
         ZoneScript *m_zoneScript;
 
+        // transports
+        Transport *m_transport;
+
         //these functions are used mostly for Relocate() and Corpse/Player specific stuff...
         //use them ONLY in LoadFromDB()/Create() funcs and nowhere else!
         //mapId/instanceId should be set in SetMap() function!