joint_model.cpp

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/* Author: Ioan Sucan */
 
#include <moveit/exceptions/exceptions.h>
#include <moveit/robot_model/joint_model.h>
#include <moveit/robot_model/link_model.h>
#include <algorithm>
 
namespace moveit
{
namespace core
{
JointModel::JointModel(const std::string& name, size_t joint_index, size_t first_variable_index)
  : name_(name)
  , joint_index_(joint_index)
  , first_variable_index_(first_variable_index)
  , type_(UNKNOWN)
  , parent_link_model_(nullptr)
  , child_link_model_(nullptr)
  , mimic_(nullptr)
  , mimic_factor_(1.0)
  , mimic_offset_(0.0)
  , passive_(false)
  , distance_factor_(1.0)
{
}
 
JointModel::~JointModel() = default;
 
std::string JointModel::getTypeName() const
{
  switch (type_)
  {
    case UNKNOWN:
      return "Unknown";
    case REVOLUTE:
      return "Revolute";
    case PRISMATIC:
      return "Prismatic";
    case PLANAR:
      return "Planar";
    case FLOATING:
      return "Floating";
    case FIXED:
      return "Fixed";
    default:
      return "[Unknown]";
  }
}
 
size_t JointModel::getLocalVariableIndex(const std::string& variable) const
{
  VariableIndexMap::const_iterator it = variable_index_map_.find(variable);
  if (it == variable_index_map_.end())
    throw Exception("Could not find variable '" + variable + "' to get bounds for within joint '" + name_ + "'");
  return it->second;
}
 
bool JointModel::harmonizePosition(double* /*values*/, const Bounds& /*other_bounds*/) const
{
  return false;
}
 
bool JointModel::enforceVelocityBounds(double* values, const Bounds& other_bounds) const
{
  bool change = false;
  for (std::size_t i = 0; i < other_bounds.size(); ++i)
    if (other_bounds[i].max_velocity_ < values[i])
    {
      values[i] = other_bounds[i].max_velocity_;
      change = true;
    }
    else if (other_bounds[i].min_velocity_ > values[i])
    {
      values[i] = other_bounds[i].min_velocity_;
      change = true;
    }
  return change;
}
 
bool JointModel::satisfiesVelocityBounds(const double* values, const Bounds& other_bounds, double margin) const
{
  for (std::size_t i = 0; i < other_bounds.size(); ++i)
    if (other_bounds[i].max_velocity_ + margin < values[i])
      return false;
    else if (other_bounds[i].min_velocity_ - margin > values[i])
      return false;
  return true;
}
 
const VariableBounds& JointModel::getVariableBounds(const std::string& variable) const
{
  return variable_bounds_[getLocalVariableIndex(variable)];
}
 
void JointModel::setVariableBounds(const std::string& variable, const VariableBounds& bounds)
{
  variable_bounds_[getLocalVariableIndex(variable)] = bounds;
  computeVariableBoundsMsg();
}
 
void JointModel::setVariableBounds(const std::vector<moveit_msgs::msg::JointLimits>& jlim)
{
  for (std::size_t j = 0; j < variable_names_.size(); ++j)
    for (const moveit_msgs::msg::JointLimits& joint_limit : jlim)
      if (joint_limit.joint_name == variable_names_[j])
      {
        variable_bounds_[j].position_bounded_ = joint_limit.has_position_limits;
        if (joint_limit.has_position_limits)
        {
          variable_bounds_[j].min_position_ = joint_limit.min_position;
          variable_bounds_[j].max_position_ = joint_limit.max_position;
        }
        variable_bounds_[j].velocity_bounded_ = joint_limit.has_velocity_limits;
        if (joint_limit.has_velocity_limits)
        {
          variable_bounds_[j].min_velocity_ = -joint_limit.max_velocity;
          variable_bounds_[j].max_velocity_ = joint_limit.max_velocity;
        }
        variable_bounds_[j].acceleration_bounded_ = joint_limit.has_acceleration_limits;
        if (joint_limit.has_acceleration_limits)
        {
          variable_bounds_[j].min_acceleration_ = -joint_limit.max_acceleration;
          variable_bounds_[j].max_acceleration_ = joint_limit.max_acceleration;
        }
        variable_bounds_[j].jerk_bounded_ = joint_limit.has_jerk_limits;
        if (joint_limit.has_jerk_limits)
        {
          variable_bounds_[j].min_jerk_ = -joint_limit.max_jerk;
          variable_bounds_[j].max_jerk_ = joint_limit.max_jerk;
        }
        break;
      }
  computeVariableBoundsMsg();
}
 
void JointModel::computeVariableBoundsMsg()
{
  variable_bounds_msg_.clear();
  for (std::size_t i = 0; i < variable_bounds_.size(); ++i)
  {
    moveit_msgs::msg::JointLimits lim;
    lim.joint_name = variable_names_[i];
    lim.has_position_limits = variable_bounds_[i].position_bounded_;
    lim.min_position = variable_bounds_[i].min_position_;
    lim.max_position = variable_bounds_[i].max_position_;
    lim.has_velocity_limits = variable_bounds_[i].velocity_bounded_;
    lim.max_velocity = std::min(fabs(variable_bounds_[i].min_velocity_), fabs(variable_bounds_[i].max_velocity_));
    lim.has_acceleration_limits = variable_bounds_[i].acceleration_bounded_;
    lim.max_acceleration =
        std::min(fabs(variable_bounds_[i].min_acceleration_), fabs(variable_bounds_[i].max_acceleration_));
    lim.has_jerk_limits = variable_bounds_[i].jerk_bounded_;
    lim.max_jerk = std::min(fabs(variable_bounds_[i].min_jerk_), fabs(variable_bounds_[i].max_jerk_));
    variable_bounds_msg_.push_back(lim);
  }
}
 
void JointModel::setMimic(const JointModel* mimic, double factor, double offset)
{
  mimic_ = mimic;
  mimic_factor_ = factor;
  mimic_offset_ = offset;
}
 
void JointModel::addMimicRequest(const JointModel* joint)
{
  mimic_requests_.push_back(joint);
}
 
void JointModel::addDescendantJointModel(const JointModel* joint)
{
  descendant_joint_models_.push_back(joint);
  if (joint->getType() != FIXED)
    non_fixed_descendant_joint_models_.push_back(joint);
}
 
void JointModel::addDescendantLinkModel(const LinkModel* link)
{
  descendant_link_models_.push_back(link);
}
 
namespace
{
inline void printBoundHelper(std::ostream& out, double v)
{
  if (v <= -std::numeric_limits<double>::infinity())
    out << "-inf";
  else if (v >= std::numeric_limits<double>::infinity())
    out << "inf";
  else
    out << v;
}
}  // namespace
 
std::ostream& operator<<(std::ostream& out, const VariableBounds& b)
{
  out << "P." << (b.position_bounded_ ? "bounded" : "unbounded") << " [";
  printBoundHelper(out, b.min_position_);
  out << ", ";
  printBoundHelper(out, b.max_position_);
  out << "]; "
      << "V." << (b.velocity_bounded_ ? "bounded" : "unbounded") << " [";
  printBoundHelper(out, b.min_velocity_);
  out << ", ";
  printBoundHelper(out, b.max_velocity_);
  out << "]; "
      << "A." << (b.acceleration_bounded_ ? "bounded" : "unbounded") << " [";
  printBoundHelper(out, b.min_acceleration_);
  out << ", ";
  printBoundHelper(out, b.max_acceleration_);
  out << "]; "
      << "J." << (b.jerk_bounded_ ? "bounded" : "unbounded") << " [";
  printBoundHelper(out, b.min_jerk_);
  out << ", ";
  printBoundHelper(out, b.max_jerk_);
  out << "];";
  return out;
}
 
}  // end of namespace core
}  // end of namespace moveit