MovementUtil.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 "MoveSplineFlag.h"
#include <cmath>
 
namespace Movement
{
    float gravity = static_cast<float>(19.29110527038574);
    UInt32Counter splineIdGen;
 
    float terminalVelocity = 60.148003f;
    float terminalSafefallVelocity = 7.0f;
 
    const float terminal_length = float(terminalVelocity * terminalVelocity) / (2.0f * gravity);
    const float terminal_safeFall_length = (terminalSafefallVelocity * terminalSafefallVelocity) / (2.0f * gravity);
    const float terminal_fallTime = float(terminalVelocity / gravity); // the time that needed to reach terminalVelocity
    const float terminal_safeFall_fallTime = float(terminalSafefallVelocity / gravity); // the time that needed to reach terminalVelocity with safefall
 
    float computeFallTime(float path_length, bool isSafeFall)
    {
        if (path_length < 0.0f)
            return 0.0f;
 
        float time;
        if (isSafeFall)
        {
            if (path_length >= terminal_safeFall_length)
                time = (path_length - terminal_safeFall_length) / terminalSafefallVelocity + terminal_safeFall_fallTime;
            else
                time = std::sqrt(2.0f * path_length / gravity);
        }
        else
        {
            if (path_length >= terminal_length)
                time = (path_length - terminal_length) / terminalVelocity + terminal_fallTime;
            else
                time = std::sqrt(2.0f * path_length / gravity);
        }
 
        return time;
    }
 
    float computeFallElevation(float t_passed, bool isSafeFall, float start_velocity /*= 0.0f*/)
    {
        float termVel;
        float result;
 
        if (isSafeFall)
            termVel = terminalSafefallVelocity;
        else
            termVel = terminalVelocity;
 
        if (start_velocity > termVel)
            start_velocity = termVel;
 
        float terminal_time = (isSafeFall ? terminal_safeFall_fallTime : terminal_fallTime) - start_velocity / gravity; // the time that needed to reach terminalVelocity
 
        if (t_passed > terminal_time)
        {
            result = termVel * (t_passed - terminal_time) +
                start_velocity * terminal_time +
                gravity * terminal_time * terminal_time * 0.5f;
        }
        else
            result = t_passed * (start_velocity + t_passed * gravity * 0.5f);
 
        return result;
    }
 
    #define STR(x) #x
 
    char const* g_MovementFlag_names[] =
    {
        STR(Forward            ), // 0x00000001,
        STR(Backward           ), // 0x00000002,
        STR(Strafe_Left        ), // 0x00000004,
        STR(Strafe_Right       ), // 0x00000008,
        STR(Turn_Left          ), // 0x00000010,
        STR(Turn_Right         ), // 0x00000020,
        STR(Pitch_Up           ), // 0x00000040,
        STR(Pitch_Down         ), // 0x00000080,
 
        STR(Walk               ), // 0x00000100,               // Walking
        STR(Ontransport        ), // 0x00000200,
        STR(Levitation         ), // 0x00000400,
        STR(Root               ), // 0x00000800,
        STR(Falling            ), // 0x00001000,
        STR(Fallingfar         ), // 0x00002000,
        STR(Pendingstop        ), // 0x00004000,
        STR(PendingStrafeStop  ), // 0x00008000,
        STR(PendingForward     ), // 0x00010000,
        STR(PendingBackward    ), // 0x00020000,
        STR(PendingStrafeReft  ), // 0x00040000,
        STR(PendingStrafeRight ), // 0x00080000,
        STR(PendingRoot        ), // 0x00100000,
        STR(Swimming           ), // 0x00200000,               // Appears With Fly Flag Also
        STR(Ascending          ), // 0x00400000,               // Swim Up Also
        STR(Descending         ), // 0x00800000,               // Swim Down Also
        STR(Can_Fly            ), // 0x01000000,               // Can Fly In 3.3?
        STR(Flying             ), // 0x02000000,               // Actual Flying Mode
        STR(Spline_Elevation   ), // 0x04000000,               // Used For Flight Paths
        STR(Spline_Enabled     ), // 0x08000000,               // Used For Flight Paths
        STR(Waterwalking       ), // 0x10000000,               // Prevent Unit From Falling Through Water
        STR(Safe_Fall          ), // 0x20000000,               // Active Rogue Safe Fall Spell (Passive)
        STR(Hover              ), // 0x40000000
        STR(Unknown13          ), // 0x80000000
        STR(NoStrafe           ),
        STR(NoJump             ),
        STR(Unk3               ),
        STR(FullSpeedTurning   ),
        STR(FullSpeedPitching  ),
        STR(Allow_Pitching     ),
        STR(Unk4               ),
        STR(Unk5               ),
        STR(Unk6               ),
        STR(Unk7               ),
        STR(Interp_Move        ),
        STR(Interp_Turning     ),
        STR(Interp_Pitching    ),
        STR(Unk8               ),
        STR(Unk9               ),
        STR(Unk10              ),
    };
 
    char const* g_SplineFlag_names[32] =
    {
        STR(AnimBit1     ), // 0x00000001,
        STR(AnimBit2     ), // 0x00000002,
        STR(AnimBit3     ), // 0x00000004,
        STR(AnimBit4     ), // 0x00000008,
        STR(AnimBit5     ), // 0x00000010,
        STR(AnimBit6     ), // 0x00000020,
        STR(AnimBit7     ), // 0x00000040,
        STR(AnimBit8     ), // 0x00000080,
        STR(Done         ), // 0x00000100,
        STR(Falling      ), // 0x00000200,           // Not Compartible With Trajectory Movement
        STR(No_Spline    ), // 0x00000400,
        STR(Trajectory   ), // 0x00000800,           // Not Compartible With Fall Movement
        STR(CanSwim      ), // 0x00001000,
        STR(Flying       ), // 0x00002000,           // Smooth Movement(Catmullrom Interpolation Mode), Flying Animation
        STR(Knockback    ), // 0x00004000,           // Model Orientation Fixed
        STR(Final_Point  ), // 0x00008000,
        STR(Final_Target ), // 0x00010000,
        STR(Final_Angle  ), // 0x00020000,
        STR(Catmullrom   ), // 0x00040000,           // Used Catmullrom Interpolation Mode
        STR(Cyclic       ), // 0x00080000,           // Movement By Cycled Spline
        STR(Enter_Cycle  ), // 0x00100000,           // Everytime Appears With Cyclic Flag In Monster Move Packet
        STR(Animation    ), // 0x00200000,           // Animationid (0...3), Uint32 Time, Not Compartible With Trajectory And Fall Movement
        STR(Unknown4     ), // 0x00400000,           // Disables Movement By Path
        STR(Unknown5     ), // 0x00800000,
        STR(Unknown6     ), // 0x01000000,
        STR(Unknown7     ), // 0x02000000,
        STR(Unknown8     ), // 0x04000000,
        STR(Backward     ), // 0x08000000,           // Appears With Runmode Flag, Nodes ), // 1, Handles Orientation
        STR(Unknown10    ), // 0x10000000,
        STR(Unknown11    ), // 0x20000000,
        STR(Unknown12    ), // 0x40000000,
        STR(Unknown13    ), // 0x80000000,
    };
 
    template<class Flags, int N>
    void print_flags(Flags t, char const* (&names)[N], std::string& str)
    {
        for (int i = 0; i < N; ++i)
        {
            if ((t & Flags(1 << i)) && names[i] != nullptr)
                str.append(" ").append(names[i]);
        }
    }
 
    std::string MoveSplineFlag::ToString() const
    {
        std::string str;
        print_flags(raw(), g_SplineFlag_names, str);
        return str;
    }
}