Core/Spells: fix wrong distance calculations in AoE spells [Needs testing] (#16290)

Core/Spells: Fix wrong distance calculations in AoE spells.
Pull request #16290 by chaodhib.
God bless, finally.

(cherry picked from commit a1f2f30c145f6ad9c4baeffeff32618e71ff537c)

5 files changed, 53 insertions, 58 deletions

diff --git a/src/server/game/Entities/Object/Object.cpp b/src/server/game/Entities/Object/Object.cpp
index c0fbdaaf530..94fd3e932c8 100644
--- a/src/server/game/Entities/Object/Object.cpp
+++ b/src/server/game/Entities/Object/Object.cpp
@@ -969,39 +969,31 @@ InstanceScript* WorldObject::GetInstanceScript()
 float WorldObject::GetDistanceZ(const WorldObject* obj) const
 {
     float dz = std::fabs(GetPositionZ() - obj->GetPositionZ());
-    float sizefactor = GetObjectSize() + obj->GetObjectSize();
+    float sizefactor = GetCombatReach() + obj->GetCombatReach();
     float dist = dz - sizefactor;
     return (dist > 0 ? dist : 0);
 }
 
-bool WorldObject::_IsWithinDist(WorldObject const* obj, float dist2compare, bool is3D) const
+bool WorldObject::_IsWithinDist(WorldObject const* obj, float dist2compare, bool is3D, bool incOwnRadius, bool incTargetRadius) const
 {
-    float sizefactor = GetObjectSize() + obj->GetObjectSize();
+    float sizefactor = 0;
+    sizefactor += incOwnRadius ? GetCombatReach() : 0.0f;
+    sizefactor += incTargetRadius ? obj->GetCombatReach() : 0.0f;
     float maxdist = dist2compare + sizefactor;
 
+    Position const* thisOrTransport = this;
+    Position const* objOrObjTransport = obj;
+
     if (GetTransport() && obj->GetTransport() && obj->GetTransport()->GetGUID() == GetTransport()->GetGUID())
     {
-        float dtx = m_movementInfo.transport.pos.m_positionX - obj->m_movementInfo.transport.pos.m_positionX;
-        float dty = m_movementInfo.transport.pos.m_positionY - obj->m_movementInfo.transport.pos.m_positionY;
-        float disttsq = dtx * dtx + dty * dty;
-        if (is3D)
-        {
-            float dtz = m_movementInfo.transport.pos.m_positionZ - obj->m_movementInfo.transport.pos.m_positionZ;
-            disttsq += dtz * dtz;
-        }
-        return disttsq < (maxdist * maxdist);
+        thisOrTransport = &m_movementInfo.transport.pos;
+        objOrObjTransport = &obj->m_movementInfo.transport.pos;
     }
 
-    float dx = GetPositionX() - obj->GetPositionX();
-    float dy = GetPositionY() - obj->GetPositionY();
-    float distsq = dx*dx + dy*dy;
     if (is3D)
-    {
-        float dz = GetPositionZ() - obj->GetPositionZ();
-        distsq += dz*dz;
-    }
-
-    return distsq < maxdist * maxdist;
+        return thisOrTransport->IsInDist(objOrObjTransport, maxdist);
+    else
+        return thisOrTransport->IsInDist2d(objOrObjTransport, maxdist);
 }
 
 bool WorldObject::IsWithinLOSInMap(const WorldObject* obj, VMAP::ModelIgnoreFlags ignoreFlags) const
@@ -1020,31 +1012,31 @@ bool WorldObject::IsWithinLOSInMap(const WorldObject* obj, VMAP::ModelIgnoreFlag
 
 float WorldObject::GetDistance(const WorldObject* obj) const
 {
-    float d = GetExactDist(obj) - GetObjectSize() - obj->GetObjectSize();
+    float d = GetExactDist(obj) - GetCombatReach() - obj->GetCombatReach();
     return d > 0.0f ? d : 0.0f;
 }
 
 float WorldObject::GetDistance(const Position &pos) const
 {
-    float d = GetExactDist(&pos) - GetObjectSize();
+    float d = GetExactDist(&pos) - GetCombatReach();
     return d > 0.0f ? d : 0.0f;
 }
 
 float WorldObject::GetDistance(float x, float y, float z) const
 {
-    float d = GetExactDist(x, y, z) - GetObjectSize();
+    float d = GetExactDist(x, y, z) - GetCombatReach();
     return d > 0.0f ? d : 0.0f;
 }
 
 float WorldObject::GetDistance2d(const WorldObject* obj) const
 {
-    float d = GetExactDist2d(obj) - GetObjectSize() - obj->GetObjectSize();
+    float d = GetExactDist2d(obj) - GetCombatReach() - obj->GetCombatReach();
     return d > 0.0f ? d : 0.0f;
 }
 
 float WorldObject::GetDistance2d(float x, float y) const
 {
-    float d = GetExactDist2d(x, y) - GetObjectSize();
+    float d = GetExactDist2d(x, y) - GetCombatReach();
     return d > 0.0f ? d : 0.0f;
 }
 
@@ -1064,22 +1056,22 @@ bool WorldObject::IsInMap(const WorldObject* obj) const
 
 bool WorldObject::IsWithinDist3d(float x, float y, float z, float dist) const
 {
-    return IsInDist(x, y, z, dist + GetObjectSize());
+    return IsInDist(x, y, z, dist + GetCombatReach());
 }
 
 bool WorldObject::IsWithinDist3d(const Position* pos, float dist) const
 {
-    return IsInDist(pos, dist + GetObjectSize());
+    return IsInDist(pos, dist + GetCombatReach());
 }
 
 bool WorldObject::IsWithinDist2d(float x, float y, float dist) const
 {
-    return IsInDist2d(x, y, dist + GetObjectSize());
+    return IsInDist2d(x, y, dist + GetCombatReach());
 }
 
 bool WorldObject::IsWithinDist2d(const Position* pos, float dist) const
 {
-    return IsInDist2d(pos, dist + GetObjectSize());
+    return IsInDist2d(pos, dist + GetCombatReach());
 }
 
 bool WorldObject::IsWithinDist(WorldObject const* obj, float dist2compare, bool is3D /*= true*/) const
@@ -1087,9 +1079,9 @@ bool WorldObject::IsWithinDist(WorldObject const* obj, float dist2compare, bool
     return obj && _IsWithinDist(obj, dist2compare, is3D);
 }
 
-bool WorldObject::IsWithinDistInMap(WorldObject const* obj, float dist2compare, bool is3D /*= true*/) const
+bool WorldObject::IsWithinDistInMap(WorldObject const* obj, float dist2compare, bool is3D /*= true*/, bool incOwnRadius /*= true*/, bool incTargetRadius /*= true*/) const
 {
-    return obj && IsInMap(obj) && IsInPhase(obj) && _IsWithinDist(obj, dist2compare, is3D);
+    return obj && IsInMap(obj) && IsInPhase(obj) && _IsWithinDist(obj, dist2compare, is3D, incOwnRadius, incTargetRadius);
 }
 
 bool WorldObject::IsWithinLOS(float ox, float oy, float oz, VMAP::ModelIgnoreFlags ignoreFlags) const
@@ -1116,7 +1108,7 @@ Position WorldObject::GetHitSpherePointFor(Position const& dest) const
 {
     G3D::Vector3 vThis(GetPositionX(), GetPositionY(), GetPositionZ());
     G3D::Vector3 vObj(dest.GetPositionX(), dest.GetPositionY(), dest.GetPositionZ());
-    G3D::Vector3 contactPoint = vThis + (vObj - vThis).directionOrZero() * std::min(dest.GetExactDist(GetPosition()), GetObjectSize());
+    G3D::Vector3 contactPoint = vThis + (vObj - vThis).directionOrZero() * std::min(dest.GetExactDist(GetPosition()), GetCombatReach());
 
     return Position(contactPoint.x, contactPoint.y, contactPoint.z, GetAngle(contactPoint.x, contactPoint.y));
 }
@@ -1163,7 +1155,7 @@ bool WorldObject::IsInRange(WorldObject const* obj, float minRange, float maxRan
         distsq += dz*dz;
     }
 
-    float sizefactor = GetObjectSize() + obj->GetObjectSize();
+    float sizefactor = GetCombatReach() + obj->GetCombatReach();
 
     // check only for real range
     if (minRange > 0.0f)
@@ -1183,7 +1175,7 @@ bool WorldObject::IsInRange2d(float x, float y, float minRange, float maxRange)
     float dy = GetPositionY() - y;
     float distsq = dx*dx + dy*dy;
 
-    float sizefactor = GetObjectSize();
+    float sizefactor = GetCombatReach();
 
     // check only for real range
     if (minRange > 0.0f)
@@ -1204,7 +1196,7 @@ bool WorldObject::IsInRange3d(float x, float y, float z, float minRange, float m
     float dz = GetPositionZ() - z;
     float distsq = dx*dx + dy*dy + dz*dz;
 
-    float sizefactor = GetObjectSize();
+    float sizefactor = GetCombatReach();
 
     // check only for real range
     if (minRange > 0.0f)
@@ -1227,7 +1219,7 @@ bool WorldObject::IsInBetween(Position const& pos1, Position const& pos2, float
         return false;
 
     if (!size)
-        size = GetObjectSize() / 2;
+        size = GetCombatReach() / 2;
 
     float angle = pos1.GetAngle(pos2);
 
@@ -1837,7 +1829,7 @@ TempSummon* WorldObject::SummonCreature(uint32 id, float x, float y, float z, fl
 {
     if (!x && !y && !z)
     {
-        GetClosePoint(x, y, z, GetObjectSize());
+        GetClosePoint(x, y, z, GetCombatReach());
         ang = GetOrientation();
     }
 
@@ -1879,7 +1871,7 @@ GameObject* WorldObject::SummonGameObject(uint32 entry, float x, float y, float
 {
     if (!x && !y && !z)
     {
-        GetClosePoint(x, y, z, GetObjectSize());
+        GetClosePoint(x, y, z, GetCombatReach());
         ang = GetOrientation();
     }
 
@@ -1993,8 +1985,8 @@ void WorldObject::GetPlayerListInGrid(Container& playerContainer, float maxSearc
 
 void WorldObject::GetNearPoint2D(float &x, float &y, float distance2d, float absAngle) const
 {
-    x = GetPositionX() + (GetObjectSize() + distance2d) * std::cos(absAngle);
-    y = GetPositionY() + (GetObjectSize() + distance2d) * std::sin(absAngle);
+    x = GetPositionX() + (GetCombatReach() + distance2d) * std::cos(absAngle);
+    y = GetPositionY() + (GetCombatReach() + distance2d) * std::sin(absAngle);
 
     Trinity::NormalizeMapCoord(x);
     Trinity::NormalizeMapCoord(y);
@@ -2066,15 +2058,7 @@ Position WorldObject::GetRandomNearPosition(float radius)
 void WorldObject::GetContactPoint(const WorldObject* obj, float &x, float &y, float &z, float distance2d /*= CONTACT_DISTANCE*/) const
 {
     // angle to face `obj` to `this` using distance includes size of `obj`
-    GetNearPoint(obj, x, y, z, obj->GetObjectSize(), distance2d, GetAngle(obj));
-}
-
-float WorldObject::GetObjectSize() const
-{
-    if (Unit const* thisUnit = ToUnit())
-        return thisUnit->m_unitData->CombatReach;
-
-    return DEFAULT_WORLD_OBJECT_SIZE;
+    GetNearPoint(obj, x, y, z, obj->GetCombatReach(), distance2d, GetAngle(obj));
 }
 
 void WorldObject::MovePosition(Position &pos, float dist, float angle)
diff --git a/src/server/game/Entities/Object/Object.h b/src/server/game/Entities/Object/Object.h
index c5e22c86c3a..1d48e1f2384 100644
--- a/src/server/game/Entities/Object/Object.h
+++ b/src/server/game/Entities/Object/Object.h
@@ -395,7 +395,7 @@ class TC_GAME_API WorldObject : public Object, public WorldLocation
         Position GetRandomNearPosition(float radius);
         void GetContactPoint(WorldObject const* obj, float &x, float &y, float &z, float distance2d = CONTACT_DISTANCE) const;
 
-        float GetObjectSize() const;
+        virtual float GetCombatReach() const { return 0.0f; } // overridden (only) in Unit
         void UpdateGroundPositionZ(float x, float y, float &z) const;
         void UpdateAllowedPositionZ(float x, float y, float &z) const;
 
@@ -445,7 +445,7 @@ class TC_GAME_API WorldObject : public Object, public WorldLocation
         bool IsWithinDist2d(Position const* pos, float dist) const;
         // use only if you will sure about placing both object at same map
         bool IsWithinDist(WorldObject const* obj, float dist2compare, bool is3D = true) const;
-        bool IsWithinDistInMap(WorldObject const* obj, float dist2compare, bool is3D = true) const;
+        bool IsWithinDistInMap(WorldObject const* obj, float dist2compare, bool is3D = true, bool incOwnRadius = true, bool incTargetRadius = true) const;
         bool IsWithinLOS(float x, float y, float z, VMAP::ModelIgnoreFlags ignoreFlags = VMAP::ModelIgnoreFlags::Nothing) const;
         bool IsWithinLOSInMap(WorldObject const* obj, VMAP::ModelIgnoreFlags ignoreFlags = VMAP::ModelIgnoreFlags::Nothing) const;
         Position GetHitSpherePointFor(Position const& dest) const;
@@ -605,7 +605,7 @@ class TC_GAME_API WorldObject : public Object, public WorldLocation
 
         uint16 m_notifyflags;
         uint16 m_executed_notifies;
-        virtual bool _IsWithinDist(WorldObject const* obj, float dist2compare, bool is3D) const;
+        virtual bool _IsWithinDist(WorldObject const* obj, float dist2compare, bool is3D, bool incOwnRadius = true, bool incTargetRadius = true) const;
 
         bool CanNeverSee(WorldObject const* obj) const;
         virtual bool CanAlwaysSee(WorldObject const* /*obj*/) const { return false; }
diff --git a/src/server/game/Entities/Object/ObjectDefines.h b/src/server/game/Entities/Object/ObjectDefines.h
index b0db49bcf9f..43f2ea15a4d 100644
--- a/src/server/game/Entities/Object/ObjectDefines.h
+++ b/src/server/game/Entities/Object/ObjectDefines.h
@@ -36,11 +36,11 @@
 #define DEFAULT_VISIBILITY_INSTANCE     170.0f                  // default visible distance in instances, 170 yards
 #define DEFAULT_VISIBILITY_BGARENAS     533.0f                  // default visible distance in BG/Arenas, roughly 533 yards
 
-#define DEFAULT_WORLD_OBJECT_SIZE       0.388999998569489f      // player size, also currently used (correctly?) for any non Unit world objects
-#define DEFAULT_COMBAT_REACH            1.5f
-#define MIN_MELEE_REACH                 2.0f
-#define NOMINAL_MELEE_RANGE             5.0f
-#define MELEE_RANGE                     (NOMINAL_MELEE_RANGE - MIN_MELEE_REACH * 2) //center to center for players
+#define DEFAULT_PLAYER_BOUNDING_RADIUS      0.388999998569489f     // player size, also currently used (correctly?) for any non Unit world objects
+#define DEFAULT_PLAYER_COMBAT_REACH         1.5f
+#define MIN_MELEE_REACH                     2.0f
+#define NOMINAL_MELEE_RANGE                 5.0f
+#define MELEE_RANGE                         (NOMINAL_MELEE_RANGE - MIN_MELEE_REACH * 2) //center to center for players
 
 enum class VisibilityDistanceType : uint8
 {
diff --git a/src/server/game/Entities/Object/Position.cpp b/src/server/game/Entities/Object/Position.cpp
index ae0fc14e173..a63a3da76d6 100644
--- a/src/server/game/Entities/Object/Position.cpp
+++ b/src/server/game/Entities/Object/Position.cpp
@@ -148,6 +148,12 @@ bool Position::IsWithinBox(const Position& center, float xradius, float yradius,
     return true;
 }
 
+bool Position::IsWithinDoubleVerticalCylinder(Position const* center, float radius, float height) const
+{
+    float verticalDelta = GetPositionZ() - center->GetPositionZ();
+    return IsInDist2d(center, radius) && std::abs(verticalDelta) <= height;
+}
+
 bool Position::HasInArc(float arc, const Position* obj, float border) const
 {
     // always have self in arc
diff --git a/src/server/game/Entities/Object/Position.h b/src/server/game/Entities/Object/Position.h
index 37f1231e709..f247c7fb860 100644
--- a/src/server/game/Entities/Object/Position.h
+++ b/src/server/game/Entities/Object/Position.h
@@ -218,6 +218,11 @@ public:
     }
 
     bool IsWithinBox(const Position& center, float xradius, float yradius, float zradius) const;
+
+    /*
+    search using this relation: dist2d < radius && abs(dz) < height
+    */
+    bool IsWithinDoubleVerticalCylinder(Position const* center, float radius, float height) const;
     bool HasInArc(float arcangle, Position const* pos, float border = 2.0f) const;
     bool HasInLine(Position const* pos, float objSize, float width) const;
     std::string ToString() const;