CPose3DInterpolator.cpp

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          http://www.mrpt.org/                          |
   |                                                                        |
   | Copyright (c) 2005-2018, 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 "poses-precomp.h"  // Precompiled headers

#include <mrpt/poses/CPose3DInterpolator.h>
#include "CPoseInterpolatorBase.hpp"  // templ impl
#include <mrpt/serialization/stl_serialization.h>

using namespace mrpt::poses;

IMPLEMENTS_SERIALIZABLE(CPose3DInterpolator, CSerializable, mrpt::poses)

uint8_t CPose3DInterpolator::serializeGetVersion() const { return 1; }
void CPose3DInterpolator::serializeTo(mrpt::serialization::CArchive& out) const
{
    out << m_path;  // v1: change container element CPose3D->TPose3D
}
void CPose3DInterpolator::serializeFrom(
    mrpt::serialization::CArchive& in, uint8_t version)
{
    switch (version)
    {
        case 0:
        {
            std::map<mrpt::Clock::time_point, mrpt::poses::CPose3D> old_path;
            in >> old_path;
            m_path.clear();
            for (const auto& p : old_path)
            {
                m_path[p.first] = p.second.asTPose();
            }
        }
        break;
        case 1:
        {
            in >> m_path;
        }
        break;
        default:
            MRPT_THROW_UNKNOWN_SERIALIZATION_VERSION(version)
    };
}

namespace mrpt::poses
{
// Specialization for DIM=3
template <>
void CPoseInterpolatorBase<3>::impl_interpolation(
    const TTimePosePair &p1, const TTimePosePair &p2, 
    const TTimePosePair &p3, const TTimePosePair &p4,
    const TInterpolatorMethod method, const mrpt::Clock::time_point &t, pose_t& out_interp) const
{
    using mrpt::math::TPose3D;
    mrpt::math::CArrayDouble<4> X, Y, Z, yaw, pitch, roll;
    mrpt::math::CArrayDouble<4> ts;
    using doubleDuration = std::chrono::duration<double>;
    doubleDuration durationT = t.time_since_epoch();
    double td = durationT.count();
    ts[0] = std::chrono::duration_cast<doubleDuration>(p1.first.time_since_epoch()).count();
    ts[1] = std::chrono::duration_cast<doubleDuration>(p2.first.time_since_epoch()).count();
    ts[2] = std::chrono::duration_cast<doubleDuration>(p3.first.time_since_epoch()).count();
    ts[3] = std::chrono::duration_cast<doubleDuration>(p4.first.time_since_epoch()).count();
    

    X[0] = p1.second.x;
    Y[0] = p1.second.y;
    Z[0] = p1.second.z;
    X[1] = p2.second.x;
    Y[1] = p2.second.y;
    Z[1] = p2.second.z;
    X[2] = p3.second.x;
    Y[2] = p3.second.y;
    Z[2] = p3.second.z;
    X[3] = p4.second.x;
    Y[3] = p4.second.y;
    Z[3] = p4.second.z;

    yaw[0] = p1.second.yaw;
    pitch[0] = p1.second.pitch;
    roll[0] = p1.second.roll;
    yaw[1] = p2.second.yaw;
    pitch[1] = p2.second.pitch;
    roll[1] = p2.second.roll;
    yaw[2] = p3.second.yaw;
    pitch[2] = p3.second.pitch;
    roll[2] = p3.second.roll;
    yaw[3] = p4.second.yaw;
    pitch[3] = p4.second.pitch;
    roll[3] = p4.second.roll;

    unwrap2PiSequence(yaw);
    unwrap2PiSequence(pitch);
    unwrap2PiSequence(roll);

    // Target interpolated values:
    switch (method)
    {
        case imSpline:
        {
            // ---------------------------------------
            //    SPLINE INTERPOLATION
            // ---------------------------------------
            out_interp.x = math::spline(td, ts, X);
            out_interp.y = math::spline(td, ts, Y);
            out_interp.z = math::spline(td, ts, Z);
            out_interp.yaw = math::spline(td, ts, yaw, true);  // Wrap 2pi
            out_interp.pitch = math::spline(td, ts, pitch, true);
            out_interp.roll = math::spline(td, ts, roll, true);
        }
        break;

        case imLinear2Neig:
        {
            out_interp.x =
                math::interpolate2points(td, ts[1], X[1], ts[2], X[2]);
            out_interp.y =
                math::interpolate2points(td, ts[1], Y[1], ts[2], Y[2]);
            out_interp.z =
                math::interpolate2points(td, ts[1], Z[1], ts[2], Z[2]);
            out_interp.yaw = math::interpolate2points(
                td, ts[1], yaw[1], ts[2], yaw[2], true);  // Wrap 2pi
            out_interp.pitch = math::interpolate2points(
                td, ts[1], pitch[1], ts[2], pitch[2], true);
            out_interp.roll = math::interpolate2points(
                td, ts[1], roll[1], ts[2], roll[2], true);
        }
        break;

        case imLinear4Neig:
        {
            out_interp.x =
                math::leastSquareLinearFit<double, decltype(ts), 4>(td, ts, X);
            out_interp.y =
                math::leastSquareLinearFit<double, decltype(ts), 4>(td, ts, Y);
            out_interp.z =
                math::leastSquareLinearFit<double, decltype(ts), 4>(td, ts, Z);
            out_interp.yaw =
                math::leastSquareLinearFit<double, decltype(ts), 4>(
                    td, ts, yaw, true);  // Wrap 2pi
            out_interp.pitch =
                math::leastSquareLinearFit<double, decltype(ts), 4>(
                    td, ts, pitch, true);
            out_interp.roll =
                math::leastSquareLinearFit<double, decltype(ts), 4>(
                    td, ts, roll, true);
        }
        break;

        case imSSLLLL:
        {
            out_interp.x = math::spline(td, ts, X);
            out_interp.y = math::spline(td, ts, Y);
            out_interp.z =
                math::leastSquareLinearFit<double, decltype(ts), 4>(td, ts, Z);
            out_interp.yaw =
                math::leastSquareLinearFit<double, decltype(ts), 4>(
                    td, ts, yaw, true);  // Wrap 2pi
            out_interp.pitch =
                math::leastSquareLinearFit<double, decltype(ts), 4>(
                    td, ts, pitch, true);
            out_interp.roll =
                math::leastSquareLinearFit<double, decltype(ts), 4>(
                    td, ts, roll, true);
        }
        break;

        case imSSLSLL:
        {
            out_interp.x = math::spline(td, ts, X);
            out_interp.y = math::spline(td, ts, Y);
            out_interp.z =
                math::leastSquareLinearFit<double, decltype(ts), 4>(td, ts, Z);
            out_interp.yaw = math::spline(td, ts, yaw, true);  // Wrap 2pi
            out_interp.pitch =
                math::leastSquareLinearFit<double, decltype(ts), 4>(
                    td, ts, pitch, true);
            out_interp.roll =
                math::leastSquareLinearFit<double, decltype(ts), 4>(
                    td, ts, roll, true);
        }
        break;

        case imLinearSlerp:
        {
            const double ratio = (td - ts[1]) / (ts[2] - ts[1]);
            mrpt::math::slerp_ypr(
                TPose3D(0, 0, 0, yaw[1], pitch[1], roll[1]),
                TPose3D(0, 0, 0, yaw[2], pitch[2], roll[2]), ratio, out_interp);

            out_interp.x =
                math::interpolate2points(td, ts[1], X[1], ts[2], X[2]);
            out_interp.y =
                math::interpolate2points(td, ts[1], Y[1], ts[2], Y[2]);
            out_interp.z =
                math::interpolate2points(td, ts[1], Z[1], ts[2], Z[2]);
        }
        break;

        case imSplineSlerp:
        {
            const double ratio = (td - ts[1]) / (ts[2] - ts[1]);
            mrpt::math::slerp_ypr(
                TPose3D(0, 0, 0, yaw[1], pitch[1], roll[1]),
                TPose3D(0, 0, 0, yaw[2], pitch[2], roll[2]), ratio, out_interp);

            out_interp.x = math::spline(td, ts, X);
            out_interp.y = math::spline(td, ts, Y);
            out_interp.z = math::spline(td, ts, Z);
        }
        break;

        default:
            THROW_EXCEPTION("Unknown value for interpolation method!");
    };  // end switch
}

// Explicit instantations:
template class CPoseInterpolatorBase<3>;
}