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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 "MovementTypedefs.h"
#include "SmartEnum.h"
#include <cmath>
namespace Movement
{
UInt32Counter splineIdGen;
/// Velocity bounds that makes fall speed limited
float constexpr terminalVelocity = 60.148003f;
float constexpr terminalSafefallVelocity = 7.0f;
float constexpr terminal_length = float(terminalVelocity * terminalVelocity) / (2.0f * gravity);
float constexpr terminal_safeFall_length = (terminalSafefallVelocity * terminalSafefallVelocity) / (2.0f * gravity);
float constexpr terminal_fallTime = float(terminalVelocity / gravity); // the time that needed to reach terminalVelocity
float constexpr 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;
}
template<class Flags>
void PrintFlags(Flags t, std::string& str)
{
for (Flags flag : EnumUtils::Iterate<Flags>())
if ((t & flag) != Flags(0))
str.append(" ").append(EnumUtils::ToConstant(flag));
}
std::string MoveSplineFlag::ToString() const
{
std::string str;
PrintFlags<MoveSplineFlagEnum>(Raw, str);
return str;
}
std::string MovementFlags_ToString(MovementFlags flags)
{
std::string str;
PrintFlags(flags, str);
return str;
}
std::string MovementFlags_ToString(MovementFlags2 flags)
{
std::string str;
PrintFlags(flags, str);
return str;
}
std::string MovementFlags_ToString(MovementFlags3 flags)
{
std::string str;
PrintFlags(flags, str);
return str;
}
}
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