steer.cpp

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/***************************************************************************

    file                 : steer.cpp
    created              : Sun Mar 19 00:08:20 CET 2000
    copyright            : (C) 2000-2026 by Eric Espie, Bernhard Wymann
    email                : berniw@bluewin.ch

 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#include "sim.h"

void SimSteerConfig(tCar *car)
{
    void *hdle = car->params;

    car->steer.steerLock = GfParmGetNum(hdle, SECT_STEER, PRM_STEERLOCK, (char*)NULL, 0.43f);
    car->steer.maxSpeed  = GfParmGetNum(hdle, SECT_STEER, PRM_STEERSPD, (char*)NULL, 1.0f);
    car->carElt->_steerLock = car->steer.steerLock;
}


void SimSteerReConfig(tCar *car)
{
    tCarPitSetupValue* steerLock = &car->carElt->pitcmd.setup.steerLock;
    if (SimAdjustPitCarSetupParam(steerLock)) {
        car->steer.steerLock = steerLock->value;
        car->carElt->_steerLock = steerLock->value;
    }
}

void
SimSteerUpdate(tCar *car)
{
    tdble steer, steer2;
    tdble stdelta;
    tdble tanSteer;

    /* input control */
    steer = car->ctrl->steer;
    steer *= car->steer.steerLock;
    stdelta = steer - car->steer.steer;

    if (((tdble) fabs(stdelta) / SimDeltaTime) > car->steer.maxSpeed) {
        steer = SIGN(stdelta) * car->steer.maxSpeed * SimDeltaTime + car->steer.steer;
    }

    car->steer.steer = steer;
    tanSteer = (tdble) fabs(tan(steer));
    steer2 = (tdble) atan2((car->wheelbase * tanSteer) , (car->wheelbase - tanSteer * car->wheeltrack));

    if (steer > 0) {
        car->wheel[FRNT_RGT].steer = steer2;
        car->wheel[FRNT_LFT].steer = steer;
    } else {
        car->wheel[FRNT_RGT].steer = steer;
        car->wheel[FRNT_LFT].steer = -steer2;
    }
}