bindings/python/spatial/motion.hpp

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//
// Copyright (c) 2015-2024 CNRS INRIA
// Copyright (c) 2016 Wandercraft, 86 rue de Paris 91400 Orsay, France.
//
 
#ifndef __pinocchio_python_spatial_motion_hpp__
#define __pinocchio_python_spatial_motion_hpp__
 
#include <eigenpy/eigenpy.hpp>
#include <eigenpy/memory.hpp>
#include <boost/python/tuple.hpp>
#include <boost/python/implicit.hpp>
 
#include "pinocchio/spatial/se3.hpp"
#include "pinocchio/spatial/motion.hpp"
#include "pinocchio/spatial/force.hpp"
 
#include "pinocchio/bindings/python/utils/cast.hpp"
#include "pinocchio/bindings/python/utils/copyable.hpp"
#include "pinocchio/bindings/python/utils/printable.hpp"
 
#if EIGENPY_VERSION_AT_MOST(2, 8, 1)
EIGENPY_DEFINE_STRUCT_ALLOCATOR_SPECIALIZATION(pinocchio::Motion)
#endif
 
namespace pinocchio
{
  namespace python
  {
    namespace bp = boost::python;
 
    template<typename T>
    struct call;
 
    template<typename Scalar, int Options>
    struct call<MotionTpl<Scalar, Options>>
    {
      typedef MotionTpl<Scalar, Options> Motion;
 
      static bool isApprox(
        const Motion & self,
        const Motion & other,
        const Scalar & prec = Eigen::NumTraits<Scalar>::dummy_precision())
      {
        return self.isApprox(other, prec);
      }
 
      static bool
      isZero(const Motion & self, const Scalar & prec = Eigen::NumTraits<Scalar>::dummy_precision())
      {
        return self.isZero(prec);
      }
    };
 
    template<typename Motion>
    struct MotionPythonVisitor : public boost::python::def_visitor<MotionPythonVisitor<Motion>>
    {
      enum
      {
        Options = traits<Motion>::Options
      };
 
      typedef typename Motion::Scalar Scalar;
      typedef ForceTpl<Scalar, Options> Force;
      typedef typename Motion::Vector6 Vector6;
      typedef typename Motion::Vector3 Vector3;
 
      typedef typename Eigen::Map<Vector3> MapVector3;
      typedef typename Eigen::Ref<Vector3> RefVector3;
 
    public:
      template<class PyClass>
      void visit(PyClass & cl) const
      {
        static const Scalar dummy_precision = Eigen::NumTraits<Scalar>::dummy_precision();
        PINOCCHIO_COMPILER_DIAGNOSTIC_PUSH
        PINOCCHIO_COMPILER_DIAGNOSTIC_IGNORED_SELF_ASSIGN_OVERLOADED
        cl.def(bp::init<>(bp::arg("self"), "Default constructor"))
          .def(bp::init<const Vector3 &, const Vector3 &>(
            (bp::arg("self"), bp::arg("linear"), bp::arg("angular")),
            "Initialize from linear and angular components of a Motion vector (don't mix the "
            "order)."))
          .def(bp::init<const Vector6 &>(
            (bp::arg("self"), bp::arg("array")),
            "Init from a vector 6 [linear velocity, angular velocity]"))
          .def(bp::init<const Motion &>((bp::arg("self"), bp::arg("clone")), "Copy constructor"))
 
          .add_property(
            "linear",
            bp::make_function(
              &MotionPythonVisitor::getLinear, bp::with_custodian_and_ward_postcall<0, 1>()),
            &MotionPythonVisitor::setLinear,
            "Linear part of a *this, corresponding to the linear velocity in case of a "
            "Spatial velocity.")
          .add_property(
            "angular",
            bp::make_function(
              &MotionPythonVisitor::getAngular, bp::with_custodian_and_ward_postcall<0, 1>()),
            &MotionPythonVisitor::setAngular,
            "Angular part of a *this, corresponding to the angular velocity in case of "
            "a Spatial velocity.")
          .add_property(
            "vector",
            bp::make_function(
              (typename Motion::ToVectorReturnType(Motion::*)()) & Motion::toVector,
              bp::return_internal_reference<>()),
            &MotionPythonVisitor::setVector, "Returns the components of *this as a 6d vector.")
          .add_property(
            "np", bp::make_function(
                    (typename Motion::ToVectorReturnType(Motion::*)()) & Motion::toVector,
                    bp::return_internal_reference<>()))
 
          .def(
            "se3Action", &Motion::template se3Action<Scalar, Options>, bp::args("self", "M"),
            "Returns the result of the action of M on *this.")
          .def(
            "se3ActionInverse", &Motion::template se3ActionInverse<Scalar, Options>,
            bp::args("self", "M"), "Returns the result of the action of the inverse of M on *this.")
 
          .add_property(
            "action", &Motion::toActionMatrix,
            "Returns the action matrix of *this (acting on Motion).")
          .add_property(
            "dualAction", &Motion::toDualActionMatrix,
            "Returns the dual action matrix of *this (acting on Force).")
          .add_property(
            "homogeneous", &Motion::toHomogeneousMatrix,
            "Equivalent homogeneous representation of the Motion vector")
 
          .def(
            "setZero", &MotionPythonVisitor::setZero, bp::arg("self"),
            "Set the linear and angular components of *this to zero.")
          .def(
            "setRandom", &MotionPythonVisitor::setRandom, bp::arg("self"),
            "Set the linear and angular components of *this to random values.")
 
          .def(
            "dot", (Scalar(Motion::*)(const ForceBase<Force> &) const)&Motion::dot,
            bp::args("self", "f"), "Dot product between *this and a Force f.")
 
          .def(
            "cross", (Motion(Motion::*)(const Motion &) const)&Motion::cross, bp::args("self", "m"),
            "Action of *this onto another Motion m. Returns ¨*this x m.")
          .def(
            "cross", (Force(Motion::*)(const Force &) const)&Motion::cross, bp::args("self", "f"),
            "Dual action of *this onto a Force f. Returns *this x* f.")
 
          .def(bp::self + bp::self)
          .def(bp::self += bp::self)
          .def(bp::self - bp::self)
          .def(bp::self -= bp::self)
          .def(-bp::self)
          .def(bp::self ^ bp::self)
          .def(bp::self ^ Force())
 
#ifndef PINOCCHIO_PYTHON_SKIP_COMPARISON_OPERATIONS
          .def(bp::self == bp::self)
          .def(bp::self != bp::self)
#endif
 
          .def(bp::self * Scalar())
          .def(Scalar() * bp::self)
          .def(bp::self / Scalar())
 
#ifndef PINOCCHIO_PYTHON_SKIP_COMPARISON_OPERATIONS
          .def(
            "isApprox", &call<Motion>::isApprox,
            (bp::arg("self"), bp::arg("other"), bp::arg("prec") = dummy_precision),
            "Returns true if *this is approximately equal to other, within the precision given "
            "by prec.")
 
          .def(
            "isZero", &call<Motion>::isZero, (bp::arg("self"), bp::arg("prec") = dummy_precision),
            "Returns true if *this is approximately equal to the zero Motion, within the "
            "precision given by prec.")
#endif
 
          .def("Random", &Motion::Random, "Returns a random Motion.")
          .staticmethod("Random")
          .def("Zero", &Motion::Zero, "Returns a zero Motion.")
          .staticmethod("Zero")
 
          .def(
            "__array__", bp::make_function(
                           (typename Motion::ToVectorReturnType(Motion::*)()) & Motion::toVector,
                           bp::return_internal_reference<>()))
          .def(
            "__array__", &__array__,
            (bp::arg("self"), bp::arg("dtype") = bp::object(), bp::arg("copy") = bp::object()),
            bp::return_internal_reference<>())
#ifndef PINOCCHIO_PYTHON_NO_SERIALIZATION
          .def_pickle(Pickle())
#endif
          ;
        PINOCCHIO_COMPILER_DIAGNOSTIC_POP
      }
 
      static void expose()
      {
        typedef pinocchio::MotionBase<Motion> MotionBase;
        bp::objects::register_dynamic_id<MotionBase>();
        bp::objects::register_conversion<Motion, MotionBase>(false);
 
        typedef pinocchio::MotionDense<Motion> MotionDense;
        bp::objects::register_dynamic_id<MotionDense>();
        bp::objects::register_conversion<Motion, MotionDense>(false);
 
#if PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION == 6 && EIGENPY_VERSION_AT_LEAST(2, 9, 0)
        typedef PINOCCHIO_SHARED_PTR_HOLDER_TYPE(Motion) HolderType;
#else
        typedef ::boost::python::detail::not_specified HolderType;
#endif
        bp::class_<Motion, HolderType>(
          "Motion",
          "Motion vectors, in se3 == M^6.\n\n"
          "Supported operations ...",
          bp::no_init)
          .def(MotionPythonVisitor<Motion>())
          .def(CastVisitor<Motion>())
          .def(ExposeConstructorByCastVisitor<Motion, ::pinocchio::Motion>())
          .def(CopyableVisitor<Motion>())
          .def(PrintableVisitor<Motion>());
      }
 
    private:
      static typename Motion::ToVectorConstReturnType
      __array__(const Motion & self, bp::object, bp::object)
      {
        return self.toVector();
      }
 
      struct Pickle : bp::pickle_suite
      {
        static boost::python::tuple getinitargs(const Motion & m)
        {
          return bp::make_tuple((Vector3)m.linear(), (Vector3)m.angular());
        }
 
        static bool getstate_manages_dict()
        {
          return true;
        }
      };
 
      static RefVector3 getLinear(Motion & self)
      {
        return self.linear();
      }
      static void setLinear(Motion & self, const Vector3 & v)
      {
        self.linear(v);
      }
      static RefVector3 getAngular(Motion & self)
      {
        return self.angular();
      }
      static void setAngular(Motion & self, const Vector3 & w)
      {
        self.angular(w);
      }
 
      static void setVector(Motion & self, const Vector6 & v)
      {
        self = v;
      }
 
      static void setZero(Motion & self)
      {
        self.setZero();
      }
      static void setRandom(Motion & self)
      {
        self.setRandom();
      }
    };
 
  } // namespace python
} // namespace pinocchio
 
#endif // ifndef __pinocchio_python_spatial_motion_hpp__