MoveSplineInit.cpp

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/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "MoveSplineInit.h"
#include "Creature.h"
#include "MovementPackets.h"
#include "MoveSpline.h"
#include "PathGenerator.h"
#include "Transport.h"
#include "Unit.h"
 
namespace Movement
{
 UnitMoveType SelectSpeedType(uint32 moveFlags)
 {
 if (moveFlags & MOVEMENTFLAG_FLYING)
 {
 if (moveFlags & MOVEMENTFLAG_BACKWARD /*&& speed_obj.flight >= speed_obj.flight_back*/)
 return MOVE_FLIGHT_BACK;
 else
 return MOVE_FLIGHT;
 }
 else if (moveFlags & MOVEMENTFLAG_SWIMMING)
 {
 if (moveFlags & MOVEMENTFLAG_BACKWARD /*&& speed_obj.swim >= speed_obj.swim_back*/)
 return MOVE_SWIM_BACK;
 else
 return MOVE_SWIM;
 }
 else if (moveFlags & MOVEMENTFLAG_WALKING)
 {
 //if (speed_obj.run > speed_obj.walk)
 return MOVE_WALK;
 }
 else if (moveFlags & MOVEMENTFLAG_BACKWARD /*&& speed_obj.run >= speed_obj.run_back*/)
 return MOVE_RUN_BACK;
 
 // Flying creatures use MOVEMENTFLAG_CAN_FLY or MOVEMENTFLAG_DISABLE_GRAVITY
 // Run speed is their default flight speed.
 return MOVE_RUN;
 }
 
 int32 MoveSplineInit::Launch()
 {
 MoveSpline& move_spline = *unit->movespline;
 
 bool transport = !unit->GetTransGUID().IsEmpty();
 Location real_position;
 // there is a big chance that current position is unknown if current state is not finalized, need compute it
 // this also allows calculate spline position and update map position in much greater intervals
 // Don't compute for transport movement if the unit is in a motion between two transports
 if (!move_spline.Finalized() && move_spline.onTransport == transport)
 real_position = move_spline.ComputePosition();
 else
 {
 Position const* pos;
 if (!transport)
 pos = unit;
 else
 pos = &unit->m_movementInfo.transport.pos;
 
 real_position.x = pos->GetPositionX();
 real_position.y = pos->GetPositionY();
 real_position.z = pos->GetPositionZ();
 real_position.orientation = unit->GetOrientation();
 }
 
 // should i do the things that user should do? - no.
 if (args.path.empty())
 return 0;
 
 // correct first vertex
 args.path[0] = real_position;
 args.initialOrientation = real_position.orientation;
 args.flags.enter_cycle = args.flags.cyclic;
 move_spline.onTransport = transport;
 
 uint32 moveFlags = unit->m_movementInfo.GetMovementFlags();
 if (!args.flags.backward)
 moveFlags = (moveFlags & ~MOVEMENTFLAG_BACKWARD) | MOVEMENTFLAG_FORWARD;
 else
 moveFlags = (moveFlags & ~MOVEMENTFLAG_FORWARD) | MOVEMENTFLAG_BACKWARD;
 
 if (moveFlags & MOVEMENTFLAG_ROOT)
 moveFlags &= ~MOVEMENTFLAG_MASK_MOVING;
 
 if (!args.HasVelocity)
 {
 // If spline is initialized with SetWalk method it only means we need to select
 // walk move speed for it but not add walk flag to unit
 uint32 moveFlagsForSpeed = moveFlags;
 if (args.walk)
 moveFlagsForSpeed |= MOVEMENTFLAG_WALKING;
 else
 moveFlagsForSpeed &= ~MOVEMENTFLAG_WALKING;
 
 args.velocity = unit->GetSpeed(SelectSpeedType(moveFlagsForSpeed));
 if (Creature* creature = unit->ToCreature())
 if (creature->HasSearchedAssistance())
 args.velocity *= 0.66f;
 }
 
 // limit the speed in the same way the client does
 float speedLimit = [&]()
 {
 if (args.flags.unlimitedSpeed)
 return std::numeric_limits<float>::max();
 
 if (args.flags.falling || args.flags.catmullrom || args.flags.flying || args.flags.parabolic)
 return 50.0f;
 
 return std::max(28.0f, unit->GetSpeed(MOVE_RUN) * 4.0f);
 }();
 
 args.velocity = std::min(args.velocity, speedLimit);
 
 if (!args.Validate(unit))
 return 0;
 
 unit->m_movementInfo.SetMovementFlags(moveFlags);
 move_spline.Initialize(args);
 
 WorldPackets::Movement::MonsterMove packet;
 packet.MoverGUID = unit->GetGUID();
 packet.Pos = Position(real_position.x, real_position.y, real_position.z, real_position.orientation);
 packet.InitializeSplineData(move_spline);
 if (transport)
 {
 packet.SplineData.Move.TransportGUID = unit->GetTransGUID();
 packet.SplineData.Move.VehicleSeat = unit->GetTransSeat();
 }
 
 unit->SendMessageToSet(packet.Write(), true);
 
 return move_spline.Duration();
 }
 
 void MoveSplineInit::Stop()
 {
 MoveSpline& move_spline = *unit->movespline;
 
 // No need to stop if we are not moving
 if (move_spline.Finalized())
 return;
 
 bool transport = !unit->GetTransGUID().IsEmpty();
 Location loc;
 if (move_spline.onTransport == transport)
 loc = move_spline.ComputePosition();
 else
 {
 Position const* pos;
 if (!transport)
 pos = unit;
 else
 pos = &unit->m_movementInfo.transport.pos;
 
 loc.x = pos->GetPositionX();
 loc.y = pos->GetPositionY();
 loc.z = pos->GetPositionZ();
 loc.orientation = unit->GetOrientation();
 }
 
 args.flags = MoveSplineFlag::Done;
 unit->m_movementInfo.RemoveMovementFlag(MOVEMENTFLAG_FORWARD);
 move_spline.onTransport = transport;
 move_spline.Initialize(args);
 
 WorldPackets::Movement::MonsterMove packet;
 packet.MoverGUID = unit->GetGUID();
 packet.Pos = Position(loc.x, loc.y, loc.z, loc.orientation);
 packet.SplineData.StopDistanceTolerance = 2;
 packet.SplineData.ID = move_spline.GetId();
 
 if (transport)
 {
 packet.SplineData.Move.TransportGUID = unit->GetTransGUID();
 packet.SplineData.Move.VehicleSeat = unit->GetTransSeat();
 }
 
 unit->SendMessageToSet(packet.Write(), true);
 }
 
 MoveSplineInit::MoveSplineInit(Unit* m) : unit(m)
 {
 args.splineId = splineIdGen.NewId();
 // Elevators also use MOVEMENTFLAG_ONTRANSPORT but we do not keep track of their position changes
 args.TransformForTransport = !unit->GetTransGUID().IsEmpty();
 // mix existing state into new
 args.flags.canSwim = unit->CanSwim();
 args.walk = unit->HasUnitMovementFlag(MOVEMENTFLAG_WALKING);
 args.flags.flying = unit->HasUnitMovementFlag(MovementFlags(MOVEMENTFLAG_CAN_FLY | MOVEMENTFLAG_DISABLE_GRAVITY));
 args.flags.smoothGroundPath = true; // enabled by default, CatmullRom mode or client config "pathSmoothing" will disable this
 args.flags.steering = unit->HasNpcFlag2(UNIT_NPC_FLAG_2_STEERING);
 }
 
 MoveSplineInit::~MoveSplineInit() = default;
 
 void MoveSplineInit::SetFacing(Vector3 const& spot)
 {
 TransportPathTransform transform(unit, args.TransformForTransport);
 Vector3 finalSpot = transform(spot);
 args.facing.f.x = finalSpot.x;
 args.facing.f.y = finalSpot.y;
 args.facing.f.z = finalSpot.z;
 args.facing.type = MONSTER_MOVE_FACING_SPOT;
 }
 
 void MoveSplineInit::SetFacing(float x, float y, float z)
 {
 SetFacing({ x, y, z });
 }
 
 void MoveSplineInit::SetFacing(Unit const* target)
 {
 args.facing.angle = unit->GetAbsoluteAngle(target);
 args.facing.target = target->GetGUID();
 args.facing.type = MONSTER_MOVE_FACING_TARGET;
 }
 
 void MoveSplineInit::SetFacing(float angle)
 {
 if (args.TransformForTransport)
 {
 if (Unit* vehicle = unit->GetVehicleBase())
 angle -= vehicle->GetOrientation();
 else if (TransportBase* transport = unit->GetTransport())
 angle -= transport->GetTransportOrientation();
 }
 
 args.facing.angle = G3D::wrap(angle, 0.f, (float)G3D::twoPi());
 args.facing.type = MONSTER_MOVE_FACING_ANGLE;
 }
 
 void MoveSplineInit::MovebyPath(PointsArray const& controls, int32 path_offset)
 {
 args.path_Idx_offset = path_offset;
 args.path.reserve(controls.size());
 std::transform(controls.begin(), controls.end(), std::back_inserter(args.path), TransportPathTransform(unit, args.TransformForTransport));
 }
 
 void MoveSplineInit::MoveTo(float x, float y, float z, bool generatePath, bool forceDestination)
 {
 MoveTo(G3D::Vector3(x, y, z), generatePath, forceDestination);
 }
 
 void MoveSplineInit::MoveTo(Vector3 const& dest, bool generatePath, bool forceDestination)
 {
 if (generatePath)
 {
 PathGenerator path(unit);
 bool result = path.CalculatePath(dest.x, dest.y, dest.z, forceDestination);
 if (result && !(path.GetPathType() & PATHFIND_NOPATH))
 {
 MovebyPath(path.GetPath());
 return;
 }
 }
 
 args.path_Idx_offset = 0;
 args.path.resize(2);
 TransportPathTransform transform(unit, args.TransformForTransport);
 args.path[1] = transform(dest);
 }
 
 void MoveSplineInit::SetFall()
 {
 args.flags.EnableFalling();
 args.flags.fallingSlow = unit->HasUnitMovementFlag(MOVEMENTFLAG_FALLING_SLOW);
 }
 
 Vector3 TransportPathTransform::operator()(Vector3 input)
 {
 if (_transformForTransport)
 if (TransportBase* transport = _owner->GetDirectTransport())
 transport->CalculatePassengerOffset(input.x, input.y, input.z);
 
 return input;
 }
}