prismatic_joint_model.cpp

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/* Author: Ioan Sucan */

#include <moveit/robot_model/prismatic_joint_model.h>
#include <limits>

namespace moveit
{
namespace core
{
PrismaticJointModel::PrismaticJointModel(const std::string& name) : JointModel(name), axis_(0.0, 0.0, 0.0)
{
  type_ = PRISMATIC;
  variable_names_.push_back(name_);
  variable_bounds_.resize(1);
  variable_bounds_[0].position_bounded_ = true;
  variable_bounds_[0].min_position_ = -std::numeric_limits<double>::max();
  variable_bounds_[0].max_position_ = std::numeric_limits<double>::max();
  variable_index_map_[name_] = 0;
  computeVariableBoundsMsg();
}

unsigned int PrismaticJointModel::getStateSpaceDimension() const
{
  return 1;
}

double PrismaticJointModel::getMaximumExtent(const Bounds& other_bounds) const
{
  return variable_bounds_[0].max_position_ - other_bounds[0].min_position_;
}

void PrismaticJointModel::getVariableDefaultPositions(double* values, const Bounds& bounds) const
{
  // if zero is a valid value
  if (bounds[0].min_position_ <= 0.0 && bounds[0].max_position_ >= 0.0)
    values[0] = 0.0;
  else
    values[0] = (bounds[0].min_position_ + bounds[0].max_position_) / 2.0;
}

bool PrismaticJointModel::satisfiesPositionBounds(const double* values, const Bounds& bounds, double margin) const
{
  return !(values[0] < bounds[0].min_position_ - margin || values[0] > bounds[0].max_position_ + margin);
}

void PrismaticJointModel::getVariableRandomPositions(random_numbers::RandomNumberGenerator& rng, double* values,
                                                     const Bounds& bounds) const
{
  values[0] = rng.uniformReal(bounds[0].min_position_, bounds[0].max_position_);
}

void PrismaticJointModel::getVariableRandomPositionsNearBy(random_numbers::RandomNumberGenerator& rng, double* values,
                                                           const Bounds& bounds, const double* near,
                                                           const double distance) const
{
  values[0] = rng.uniformReal(std::max(bounds[0].min_position_, near[0] - distance),
                              std::min(bounds[0].max_position_, near[0] + distance));
}

bool PrismaticJointModel::enforcePositionBounds(double* values, const Bounds& bounds) const
{
  if (values[0] < bounds[0].min_position_)
  {
    values[0] = bounds[0].min_position_;
    return true;
  }
  else if (values[0] > bounds[0].max_position_)
  {
    values[0] = bounds[0].max_position_;
    return true;
  }
  return false;
}

double PrismaticJointModel::distance(const double* values1, const double* values2) const
{
  return fabs(values1[0] - values2[0]);
}

void PrismaticJointModel::interpolate(const double* from, const double* to, const double t, double* state) const
{
  state[0] = from[0] + (to[0] - from[0]) * t;
}

void PrismaticJointModel::computeTransform(const double* joint_values, Eigen::Affine3d& transf) const
{
  double* d = transf.data();
  d[0] = 1.0;
  d[1] = 0.0;
  d[2] = 0.0;
  d[3] = 0.0;

  d[4] = 0.0;
  d[5] = 1.0;
  d[6] = 0.0;
  d[7] = 0.0;

  d[8] = 0.0;
  d[9] = 0.0;
  d[10] = 1.0;
  d[11] = 0.0;

  d[12] = axis_.x() * joint_values[0];
  d[13] = axis_.y() * joint_values[0];
  d[14] = axis_.z() * joint_values[0];
  d[15] = 1.0;

  //  transf.setIdentity();
  //  transf.translation() = Eigen::Vector3d(axis_ * joint_values[0]);
}

void PrismaticJointModel::computeVariablePositions(const Eigen::Affine3d& transf, double* joint_values) const
{
  joint_values[0] = transf.translation().dot(axis_);
}

}  // end of namespace core
}  // end of namespace moveit