MoveSplineInit.cpp

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/*
* This file is part of Project SkyFire https://www.projectskyfire.org.
* See LICENSE.md file for Copyright information
*/
 
#include "MovementPacketBuilder.h"
#include "MoveSpline.h"
#include "MoveSplineInit.h"
#include "Opcodes.h"
#include "Transport.h"
#include "Unit.h"
#include "Vehicle.h"
#include "WorldPacket.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;
 
        Location real_position(unit->GetPositionX(), unit->GetPositionY(), unit->GetPositionZMinusOffset(), unit->GetOrientation());
        // Elevators also use MOVEMENTFLAG_ONTRANSPORT but we do not keep track of their position changes
        if (unit->GetTransGUID())
        {
            real_position.x = unit->GetTransOffsetX();
            real_position.y = unit->GetTransOffsetY();
            real_position.z = unit->GetTransOffsetZ();
            real_position.orientation = unit->GetTransOffsetO();
        }
 
        // 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 == (unit->GetTransGUID() != 0))
            real_position = move_spline.ComputePosition();
 
        // 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;
        move_spline.onTransport = (unit->GetTransGUID() != 0);
 
        uint32 moveFlags = unit->m_movementInfo.GetMovementFlags();
        moveFlags |= MOVEMENTFLAG_FORWARD;
 
        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.flags.walkmode)
                moveFlagsForSpeed |= MOVEMENTFLAG_WALKING;
            else
                moveFlagsForSpeed &= ~MOVEMENTFLAG_WALKING;
 
            args.velocity = unit->GetSpeed(SelectSpeedType(moveFlagsForSpeed));
        }
 
        if (!args.Validate(unit))
            return 0;
 
        unit->m_movementInfo.SetMovementFlags(moveFlags);
        move_spline.Initialize(args);
 
        WorldPacket data(SMSG_ON_MONSTER_MOVE, 64);
        PacketBuilder::WriteMonsterMove(move_spline, data, unit);
        unit->SendMessageToSet(&data, 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;
 
        Location loc = move_spline.ComputePosition();
        args.flags = MoveSplineFlag::Done;
        unit->m_movementInfo.RemoveMovementFlag(MOVEMENTFLAG_FORWARD);
        move_spline.Initialize(args);
 
        WorldPacket data(SMSG_ON_MONSTER_MOVE, 64);
 
        PacketBuilder::WriteStopMovement(loc, args.splineId, data, unit);
        unit->SendMessageToSet(&data, 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();
        // mix existing state into new
        args.flags.walkmode = unit->m_movementInfo.HasMovementFlag(MOVEMENTFLAG_WALKING);
        args.flags.flying = unit->m_movementInfo.HasMovementFlag(MovementFlags(MOVEMENTFLAG_CAN_FLY | MOVEMENTFLAG_DISABLE_GRAVITY));
        args.flags.smoothGroundPath = true; // enabled by default, CatmullRom mode or client config "pathSmoothing" will disable this
    }
 
    void MoveSplineInit::SetFacing(const Unit* target)
    {
        args.flags.EnableFacingTarget();
        args.facing.target = target->GetGUID();
    }
 
    void MoveSplineInit::SetFacing(float angle)
    {
        if (args.TransformForTransport)
        {
            if (Unit* vehicle = unit->GetVehicleBase())
                angle -= vehicle->GetOrientation();
            else if (Transport* transport = unit->GetTransport())
                angle -= transport->GetOrientation();
        }
 
        args.facing.angle = G3D::wrap(angle, 0.f, (float)G3D::twoPi());
        args.flags.EnableFacingAngle();
    }
 
    void MoveSplineInit::MoveTo(const Vector3& 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;
    }
}