CSplineInterpolator1D.h

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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 |
   +------------------------------------------------------------------------+ */
#pragma once
 
#include <mrpt/serialization/CSerializable.h>
#include <map>
 
namespace mrpt
{
namespace math
{
/** A (persistent) sequence of (x,y) coordinates, allowing queries of
 * intermediate points through spline interpolation, where possible.
  *  This class internally relies on mrpt::math::spline. Optionally the y
 * coordinate can be set as wrapped in ]-pi,pi].
  *  For querying interpolated points, see
  * \ sa mrpt::math::spline, mrpt::poses::CPose3DInterpolator
 * \ingroup interpolation_grp
 */
class CSplineInterpolator1D : public mrpt::serialization::CSerializable
{
        DEFINE_SERIALIZABLE(CSplineInterpolator1D)
 
   private:
        /** The placeholders for the data */
        std::map<double, double> m_x2y;
 
        /** Whether to wrap "y" */
        bool m_wrap2pi;
 
   public:
        /** Constructor with optional initial values. */
        template <class VECTOR>
        inline CSplineInterpolator1D(
                const VECTOR& initial_x, const VECTOR& initial_y, bool wrap2pi = false)
                : m_wrap2pi(wrap2pi)
        {
                setXY(initial_x, initial_y);
        }
 
        /** Constructor */
        CSplineInterpolator1D(bool wrap2pi = false);
 
        /** If set to true, the interpolated data will be wrapped to ]-pi,pi] */
        void setWrap2pi(bool wrap) { m_wrap2pi = wrap; }
        /** Return the wrap property */
        bool getWrap2pi() { return m_wrap2pi; }
        /** Set all the data at once .
          *  The vectors must have the same length.
         */
        template <class VECTOR>
        void setXY(
                const VECTOR& x, const VECTOR& y, bool clearPreviousContent = true)
        {
                MRPT_START
                if (clearPreviousContent) m_x2y.clear();
                ASSERT_EQUAL_(x.size(), y.size());
                const size_t n = size_t(x.size());
                for (size_t i = 0; i < n; i++) m_x2y[x[i]] = y[i];
                MRPT_END
        }
 
        /** Append a new point: */
        void appendXY(double x, double y);
 
        /** Clears all stored points */
        void clear() { m_x2y.clear(); }
        /** Query an interpolation of the curve at some "x".
          *   The result is stored in "y". If the "x" point is out of range,
         * "valid_out" is set to false.
          *  \return A reference to "y"
          * \sa queryVector
          */
        double& query(double x, double& y, bool& out_valid) const;
 
        /** As query, but for a whole vector at once.
          *  \return false if there is at least one value that couldn't be
         * interpolated (in this case the output is indeterminate).
          * \sa query
          */
        template <class VECTOR1, class VECTOR2>
        bool queryVector(const VECTOR1& x, VECTOR2& out_y) const
        {
                const size_t n = size_t(x.size());
                out_y.resize(n);
                bool valid, anyValid = false;
                for (size_t i = 0; i < n; i++)
                {
                        query(x[i], out_y[i], valid);
                        if (valid) anyValid = true;
                }
                return anyValid;
        }
};
 
}  // End of namespace
}  // End of namespace