CPTG_DiffDrive_CC.cpp

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/* +---------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)               |
   |                          http://www.mrpt.org/                             |
   |                                                                           |
   | Copyright (c) 2005-2017, Individual contributors, see AUTHORS file        |
   | See: http://www.mrpt.org/Authors - All rights reserved.                   |
   | Released under BSD License. See details in http://www.mrpt.org/License    |
   +---------------------------------------------------------------------------+ */

#include "nav-precomp.h" // Precomp header
#include <mrpt/nav/tpspace/CPTG_DiffDrive_CC.h>
#include <mrpt/system/os.h>

using namespace mrpt;
using namespace mrpt::nav;
using namespace mrpt::system;
using namespace mrpt::utils;

IMPLEMENTS_SERIALIZABLE(CPTG_DiffDrive_CC,CParameterizedTrajectoryGenerator,mrpt::nav)

void CPTG_DiffDrive_CC::loadFromConfigFile(const mrpt::utils::CConfigFileBase &cfg,const std::string &sSection)
{
        CPTG_DiffDrive_CollisionGridBased ::loadFromConfigFile(cfg,sSection);
        
        MRPT_LOAD_CONFIG_VAR_NO_DEFAULT(K,double, cfg,sSection);

        // The constant curvature turning radius used in this PTG:
        R = V_MAX / W_MAX;
}
void CPTG_DiffDrive_CC::saveToConfigFile(mrpt::utils::CConfigFileBase &cfg,const std::string &sSection) const
{
        MRPT_START
        const int WN = 25, WV = 30;
        CPTG_DiffDrive_CollisionGridBased::saveToConfigFile(cfg,sSection);

        cfg.write(sSection,"K",K,   WN,WV, "K=+1 forward paths; K=-1 for backwards paths.");

        MRPT_END
}


void CPTG_DiffDrive_CC::readFromStream(mrpt::utils::CStream &in, int version)
{
        CPTG_DiffDrive_CollisionGridBased::internal_readFromStream(in);

        switch (version)
        {
        case 0:
                in >> K;
                break;
        default:
                MRPT_THROW_UNKNOWN_SERIALIZATION_VERSION(version)
        };
}

void CPTG_DiffDrive_CC::writeToStream(mrpt::utils::CStream &out, int *version) const
{
        if (version) 
        {
                *version = 0;
                return;
        }

        CPTG_DiffDrive_CollisionGridBased::internal_writeToStream(out);
        out << K;

}

std::string CPTG_DiffDrive_CC::getDescription() const
{
        char str[100];
        os::sprintf(str,100,"CPTG_DiffDrive_CC,K=%i",(int)K);
        return std::string(str);
}

void CPTG_DiffDrive_CC::ptgDiffDriveSteeringFunction( float alpha, float t,float x, float y, float phi, float &v, float &w ) const
{
        MRPT_UNUSED_PARAM(phi); MRPT_UNUSED_PARAM(x); MRPT_UNUSED_PARAM(y);
        float   u = fabs(alpha) * 0.5f; /// 6.0f;

        if (t< u*R/V_MAX)
        {
                // l-
                v = -V_MAX;
                w = W_MAX;
        }
        else
        if ( t< (u + M_PI*0.5f) * R/V_MAX )
        {
                // l+
                v = V_MAX;
                w = W_MAX;
        }
        else
        {
                // END:
                v = w = 0;
        }

        // Turn in the opposite direction??
        if (alpha<0)
                w*=-1;

        v*=K;
        w*=K;

}

bool CPTG_DiffDrive_CC::PTG_IsIntoDomain( double x, double y ) const
{
        // Aprox domain: The circle at (0,R):
        return (square(x)+square(fabs(y)-R))<=R;
}

void CPTG_DiffDrive_CC::loadDefaultParams()
{
        CPTG_DiffDrive_CollisionGridBased::loadDefaultParams();
        K = +1.0;
}