Units.h

//  trax track library
//  AD 2014
//
//  "She asked you if you love her
//  and you nod and say: Uh-Huh"
//
//                      Jade Bird
//
// Copyright (c) 2025 Trend Redaktions- und Verlagsgesellschaft mbH
// Copyright (c) 2019 Marc-Michael Horstmann
//
// Permission is hereby granted to any person obtaining a copy of this software 
// and associated source code (the "Software"), to use, view, and study the 
// Software for personal or internal business purposes, subject to the following 
// conditions:
//
// 1. Redistribution, modification, sublicensing, or commercial use of the 
// Software is NOT permitted without prior written consent from the copyright 
// holder.
//
// 2. The Software is provided "AS IS", without warranty of any kind, express 
// or implied.
//
// 3. All copies of the Software must retain this license notice.
//
// For further information, please contact: horstmann.marc@trendverlag.de
 
#pragma once

 
#include "dim/DimensionedValues.h"
#include "dim/DimLimits.h"
 
#include "spat/Vector.h"
 
namespace trax {
 
    using namespace dim;
 

    constexpr Time attention_span = 3_s;    
 
    constexpr Velocity maximum__velocity = 500_kmIh;

    constexpr Acceleration g{-9.81f * units_per_meter};
 
    constexpr Velocity bolt = 100_m / 9.58_s;   

    constexpr Length default_derailing_distance = 1.435_m / 4;
 
    constexpr Length earth_radius = 6.371e6_m;
 
    // \brief Fixed simulation steps per second.
    constexpr Real steps_per_second = 60;

    constexpr Time fixed_timestep = 1_s / steps_per_second;

    constexpr spat::Vector<One> Up = spat::Ez<One>;
 
    constexpr spat::Vector<Acceleration> G = g * Up;

    constexpr AnglePerLength epsilon__curvature = 1 / earth_radius;
} // namespace trax