pr2_arm_ik.cpp

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/* Author: Sachin Chitta, E. Gil Jones */
 
#include <angles/angles.h>
#include "pr2_arm_ik.h"
 
/**** List of angles (for reference) *******
      th1 = shoulder/turret pan
      th2 = shoulder/turret lift/pitch
      th3 = shoulder/turret roll
      th4 = elbow pitch
      th5 = elbow roll
      th6 = wrist pitch
      th7 = wrist roll
*****/
using namespace angles;
namespace pr2_arm_kinematics
{
static const rclcpp::Logger LOGGER = rclcpp::get_logger("moveit_constaint_samplers.test.pr2_arm_ik");
 
PR2ArmIK::PR2ArmIK()
{
}
 
bool PR2ArmIK::init(const urdf::ModelInterface& robot_model, const std::string& root_name, const std::string& tip_name)
{
  std::vector<urdf::Pose> link_offset;
  int num_joints = 0;
  urdf::LinkConstSharedPtr link = robot_model.getLink(tip_name);
  while (link && num_joints < 7)
  {
    urdf::JointConstSharedPtr joint;
    if (link->parent_joint)
      joint = robot_model.getJoint(link->parent_joint->name);
    if (!joint)
    {
      if (link->parent_joint)
      {
        RCLCPP_ERROR(LOGGER, "Could not find joint: %s", link->parent_joint->name.c_str());
      }
      else
      {
        RCLCPP_ERROR(LOGGER, "Link %s has no parent joint", link->name.c_str());
      }
      return false;
    }
    if (joint->type != urdf::Joint::UNKNOWN && joint->type != urdf::Joint::FIXED)
    {
      link_offset.push_back(link->parent_joint->parent_to_joint_origin_transform);
      angle_multipliers_.push_back(joint->axis.x * fabs(joint->axis.x) + joint->axis.y * fabs(joint->axis.y) +
                                   joint->axis.z * fabs(joint->axis.z));
      RCLCPP_DEBUG(LOGGER, "Joint axis: %d, %f, %f, %f", 6 - num_joints, joint->axis.x, joint->axis.y, joint->axis.z);
      if (joint->type != urdf::Joint::CONTINUOUS)
      {
        if (joint->safety)
        {
          min_angles_.push_back(joint->safety->soft_lower_limit);
          max_angles_.push_back(joint->safety->soft_upper_limit);
        }
        else
        {
          if (joint->limits)
          {
            min_angles_.push_back(joint->limits->lower);
            max_angles_.push_back(joint->limits->upper);
          }
          else
          {
            min_angles_.push_back(0.0);
            max_angles_.push_back(0.0);
            RCLCPP_WARN(LOGGER, "No joint limits or joint '%s'", joint->name.c_str());
          }
        }
        continuous_joint_.push_back(false);
      }
      else
      {
        min_angles_.push_back(-M_PI);
        max_angles_.push_back(M_PI);
        continuous_joint_.push_back(true);
      }
      addJointToChainInfo(link->parent_joint, solver_info_);
      num_joints++;
    }
    link = robot_model.getLink(link->getParent()->name);
  }
 
  solver_info_.link_names.push_back(tip_name);
 
  //  solver_info_.link_names.push_back(tip_name);
  // We expect order from root to tip, so reverse the order
  std::reverse(angle_multipliers_.begin(), angle_multipliers_.end());
  std::reverse(min_angles_.begin(), min_angles_.end());
  std::reverse(max_angles_.begin(), max_angles_.end());
  std::reverse(link_offset.begin(), link_offset.end());
  std::reverse(solver_info_.limits.begin(), solver_info_.limits.end());
  std::reverse(solver_info_.joint_names.begin(), solver_info_.joint_names.end());
  std::reverse(solver_info_.link_names.begin(), solver_info_.link_names.end());
  std::reverse(continuous_joint_.begin(), continuous_joint_.end());
 
  if (num_joints != 7)
  {
    RCLCPP_ERROR(LOGGER, "PR2ArmIK:: Chain from %s to %s does not have 7 joints", root_name.c_str(), tip_name.c_str());
    return false;
  }
 
  torso_shoulder_offset_x_ = link_offset[0].position.x;
  torso_shoulder_offset_y_ = link_offset[0].position.y;
  torso_shoulder_offset_z_ = link_offset[0].position.z;
  shoulder_upperarm_offset_ = distance(link_offset[1]);
  upperarm_elbow_offset_ = distance(link_offset[3]);
  elbow_wrist_offset_ = distance(link_offset[5]);
  shoulder_elbow_offset_ = shoulder_upperarm_offset_ + upperarm_elbow_offset_;
  shoulder_wrist_offset_ = shoulder_upperarm_offset_ + upperarm_elbow_offset_ + elbow_wrist_offset_;
 
  Eigen::Isometry3f home = Eigen::Isometry3f::Identity();
  home(0, 3) = shoulder_upperarm_offset_ + upperarm_elbow_offset_ + elbow_wrist_offset_;
  home_inv_ = home.inverse();
  grhs_ = home;
  gf_ = home_inv_;
  solution_.resize(NUM_JOINTS_ARM7DOF);
  return true;
}
 
void PR2ArmIK::addJointToChainInfo(const urdf::JointConstSharedPtr& joint, moveit_msgs::msg::KinematicSolverInfo& info)
{
  moveit_msgs::msg::JointLimits limit;
  info.joint_names.push_back(joint->name);  // Joints are coming in reverse order
 
  if (joint->type != urdf::Joint::CONTINUOUS)
  {
    if (joint->safety)
    {
      limit.min_position = joint->safety->soft_lower_limit;
      limit.max_position = joint->safety->soft_upper_limit;
      limit.has_position_limits = true;
    }
    else if (joint->limits)
    {
      limit.min_position = joint->limits->lower;
      limit.max_position = joint->limits->upper;
      limit.has_position_limits = true;
    }
    else
      limit.has_position_limits = false;
  }
  else
  {
    limit.min_position = -M_PI;
    limit.max_position = M_PI;
    limit.has_position_limits = false;
  }
  if (joint->limits)
  {
    limit.max_velocity = joint->limits->velocity;
    limit.has_velocity_limits = 1;
  }
  else
    limit.has_velocity_limits = 0;
  info.limits.push_back(limit);
}
 
void PR2ArmIK::getSolverInfo(moveit_msgs::msg::KinematicSolverInfo& info)
{
  info = solver_info_;
}
 
void PR2ArmIK::computeIKShoulderPan(const Eigen::Isometry3f& g_in, const double& t1_in,
                                    std::vector<std::vector<double> >& solution) const
{
  // t1 = shoulder/turret pan is specified
  //  solution_ik_.resize(0);
  std::vector<double> solution_ik(NUM_JOINTS_ARM7DOF, 0.0);
  Eigen::Isometry3f g = g_in;
  Eigen::Isometry3f gf_local = home_inv_;
  Eigen::Isometry3f grhs_local = home_inv_;
  // First bring everything into the arm frame
  g(0, 3) = g_in(0, 3) - torso_shoulder_offset_x_;
  g(1, 3) = g_in(1, 3) - torso_shoulder_offset_y_;
  g(2, 3) = g_in(2, 3) - torso_shoulder_offset_z_;
 
  double t1 = angles::normalize_angle(t1_in);
  if (!checkJointLimits(t1, 0))
    return;
 
  double cost1, cost2, cost3, cost4;
  double sint1, sint2, sint3, sint4;
 
  gf_local = g * home_inv_;
 
  cost1 = cos(t1);
  sint1 = sin(t1);
 
  double t2(0), t3(0), t4(0), t5(0), t6(0), t7(0);
 
  double at(0), bt(0), ct(0);
 
  double theta2[2], theta3[2], theta4[2], theta5[2], theta6[4], theta7[2];
 
  double sopx = shoulder_upperarm_offset_ * cost1;
  double sopy = shoulder_upperarm_offset_ * sint1;
  double sopz = 0;
 
  double x = g(0, 3);
  double y = g(1, 3);
  double z = g(2, 3);
 
  double dx = x - sopx;
  double dy = y - sopy;
  double dz = z - sopz;
 
  double dd = dx * dx + dy * dy + dz * dz;
 
  double numerator =
      dd - shoulder_upperarm_offset_ * shoulder_upperarm_offset_ +
      2 * shoulder_upperarm_offset_ * shoulder_elbow_offset_ - 2 * shoulder_elbow_offset_ * shoulder_elbow_offset_ +
      2 * shoulder_elbow_offset_ * shoulder_wrist_offset_ - shoulder_wrist_offset_ * shoulder_wrist_offset_;
  double denominator =
      2 * (shoulder_upperarm_offset_ - shoulder_elbow_offset_) * (shoulder_elbow_offset_ - shoulder_wrist_offset_);
 
  double acos_term = numerator / denominator;
 
  if (acos_term > 1.0 || acos_term < -1.0)
    return;
 
  double acos_angle = acos(acos_term);
 
  theta4[0] = acos_angle;
  theta4[1] = -acos_angle;
 
#ifdef DEBUG
  std::cout << "ComputeIK::theta3:" << numerator << "," << denominator << ",\n" << theta4[0] << '\n';
#endif
 
  for (double theta : theta4)
  {
    t4 = theta;
    cost4 = cos(t4);
    sint4 = sin(t4);
 
#ifdef DEBUG
    std::cout << "t4 " << t4 << '\n';
#endif
    if (std::isnan(t4))
      continue;
 
    if (!checkJointLimits(t4, 3))
      continue;
 
    at = x * cost1 + y * sint1 - shoulder_upperarm_offset_;
    bt = -z;
    ct = -shoulder_upperarm_offset_ + shoulder_elbow_offset_ +
         (shoulder_wrist_offset_ - shoulder_elbow_offset_) * cos(t4);
 
    if (!solveCosineEqn(at, bt, ct, theta2[0], theta2[1]))
      continue;
 
    for (double theta : theta2)
    {
      t2 = theta;
      if (!checkJointLimits(t2, 1))
        continue;
 
#ifdef DEBUG
      std::cout << "t2 " << t2 << '\n';
#endif
      sint2 = sin(t2);
      cost2 = cos(t2);
 
      at = sint1 * (shoulder_elbow_offset_ - shoulder_wrist_offset_) * sint2 * sint4;
      bt = (-shoulder_elbow_offset_ + shoulder_wrist_offset_) * cost1 * sint4;
      ct = y - (shoulder_upperarm_offset_ + cost2 * (-shoulder_upperarm_offset_ + shoulder_elbow_offset_ +
                                                     (-shoulder_elbow_offset_ + shoulder_wrist_offset_) * cos(t4))) *
                   sint1;
      if (!solveCosineEqn(at, bt, ct, theta3[0], theta3[1]))
        continue;
 
      for (double theta : theta3)
      {
        t3 = theta;
 
        if (!checkJointLimits(angles::normalize_angle(t3), 2))
          continue;
 
        sint3 = sin(t3);
        cost3 = cos(t3);
#ifdef DEBUG
        std::cout << "t3 " << t3 << '\n';
#endif
        if (fabs((shoulder_upperarm_offset_ - shoulder_elbow_offset_ +
                  (shoulder_elbow_offset_ - shoulder_wrist_offset_) * cost4) *
                     sint2 +
                 (shoulder_elbow_offset_ - shoulder_wrist_offset_) * cost2 * cost3 * sint4 - z) > IK_EPS)
          continue;
 
        if (fabs((shoulder_elbow_offset_ - shoulder_wrist_offset_) * sint1 * sint3 * sint4 +
                 cost1 * (shoulder_upperarm_offset_ +
                          cost2 * (-shoulder_upperarm_offset_ + shoulder_elbow_offset_ +
                                   (-shoulder_elbow_offset_ + shoulder_wrist_offset_) * cost4) +
                          (shoulder_elbow_offset_ - shoulder_wrist_offset_) * cost3 * sint2 * sint4) -
                 x) > IK_EPS)
          continue;
 
        grhs_local(0, 0) =
            cost4 * (gf_local(0, 0) * cost1 * cost2 + gf_local(1, 0) * cost2 * sint1 - gf_local(2, 0) * sint2) -
            (gf_local(2, 0) * cost2 * cost3 + cost3 * (gf_local(0, 0) * cost1 + gf_local(1, 0) * sint1) * sint2 +
             (-(gf_local(1, 0) * cost1) + gf_local(0, 0) * sint1) * sint3) *
                sint4;
 
        grhs_local(0, 1) =
            cost4 * (gf_local(0, 1) * cost1 * cost2 + gf_local(1, 1) * cost2 * sint1 - gf_local(2, 1) * sint2) -
            (gf_local(2, 1) * cost2 * cost3 + cost3 * (gf_local(0, 1) * cost1 + gf_local(1, 1) * sint1) * sint2 +
             (-(gf_local(1, 1) * cost1) + gf_local(0, 1) * sint1) * sint3) *
                sint4;
 
        grhs_local(0, 2) =
            cost4 * (gf_local(0, 2) * cost1 * cost2 + gf_local(1, 2) * cost2 * sint1 - gf_local(2, 2) * sint2) -
            (gf_local(2, 2) * cost2 * cost3 + cost3 * (gf_local(0, 2) * cost1 + gf_local(1, 2) * sint1) * sint2 +
             (-(gf_local(1, 2) * cost1) + gf_local(0, 2) * sint1) * sint3) *
                sint4;
 
        grhs_local(1, 0) = cost3 * (gf_local(1, 0) * cost1 - gf_local(0, 0) * sint1) + gf_local(2, 0) * cost2 * sint3 +
                           (gf_local(0, 0) * cost1 + gf_local(1, 0) * sint1) * sint2 * sint3;
 
        grhs_local(1, 1) = cost3 * (gf_local(1, 1) * cost1 - gf_local(0, 1) * sint1) + gf_local(2, 1) * cost2 * sint3 +
                           (gf_local(0, 1) * cost1 + gf_local(1, 1) * sint1) * sint2 * sint3;
 
        grhs_local(1, 2) = cost3 * (gf_local(1, 2) * cost1 - gf_local(0, 2) * sint1) + gf_local(2, 2) * cost2 * sint3 +
                           (gf_local(0, 2) * cost1 + gf_local(1, 2) * sint1) * sint2 * sint3;
 
        grhs_local(2, 0) =
            cost4 *
                (gf_local(2, 0) * cost2 * cost3 + cost3 * (gf_local(0, 0) * cost1 + gf_local(1, 0) * sint1) * sint2 +
                 (-(gf_local(1, 0) * cost1) + gf_local(0, 0) * sint1) * sint3) +
            (gf_local(0, 0) * cost1 * cost2 + gf_local(1, 0) * cost2 * sint1 - gf_local(2, 0) * sint2) * sint4;
 
        grhs_local(2, 1) =
            cost4 *
                (gf_local(2, 1) * cost2 * cost3 + cost3 * (gf_local(0, 1) * cost1 + gf_local(1, 1) * sint1) * sint2 +
                 (-(gf_local(1, 1) * cost1) + gf_local(0, 1) * sint1) * sint3) +
            (gf_local(0, 1) * cost1 * cost2 + gf_local(1, 1) * cost2 * sint1 - gf_local(2, 1) * sint2) * sint4;
 
        grhs_local(2, 2) =
            cost4 *
                (gf_local(2, 2) * cost2 * cost3 + cost3 * (gf_local(0, 2) * cost1 + gf_local(1, 2) * sint1) * sint2 +
                 (-(gf_local(1, 2) * cost1) + gf_local(0, 2) * sint1) * sint3) +
            (gf_local(0, 2) * cost1 * cost2 + gf_local(1, 2) * cost2 * sint1 - gf_local(2, 2) * sint2) * sint4;
 
        double val1 = sqrt(grhs_local(0, 1) * grhs_local(0, 1) + grhs_local(0, 2) * grhs_local(0, 2));
        double val2 = grhs_local(0, 0);
 
        theta6[0] = atan2(val1, val2);
        theta6[1] = atan2(-val1, val2);
 
        //            theta6[3] = M_PI + theta6[0];
        //            theta6[4] = M_PI + theta6[1];
 
        for (int mm = 0; mm < 2; ++mm)
        {
          t6 = theta6[mm];
          if (!checkJointLimits(angles::normalize_angle(t6), 5))
            continue;
 
#ifdef DEBUG
          std::cout << "t6 " << t6 << '\n';
#endif
          if (fabs(cos(t6) - grhs_local(0, 0)) > IK_EPS)
            continue;
 
          if (fabs(sin(t6)) < IK_EPS)
          {
            //                std::cout << "Singularity" << '\n';
            theta5[0] = acos(grhs_local(1, 1)) / 2.0;
            theta7[0] = theta7[0];
            theta7[1] = M_PI + theta7[0];
            theta5[1] = theta7[1];
          }
          else
          {
            theta7[0] = atan2(grhs_local(0, 1), grhs_local(0, 2));
            theta5[0] = atan2(grhs_local(1, 0), -grhs_local(2, 0));
            theta7[1] = M_PI + theta7[0];
            theta5[1] = M_PI + theta5[0];
          }
#ifdef DEBUG
          std::cout << "theta1: " << t1 << '\n';
          std::cout << "theta2: " << t2 << '\n';
          std::cout << "theta3: " << t3 << '\n';
          std::cout << "theta4: " << t4 << '\n';
          std::cout << "theta5: " << t5 << '\n';
          std::cout << "theta6: " << t6 << '\n';
          std::cout << "theta7: " << t7 << '\n' << '\n' << '\n';
#endif
          for (int lll = 0; lll < 2; ++lll)
          {
            t5 = theta5[lll];
            t7 = theta7[lll];
            if (!checkJointLimits(t5, 4))
              continue;
            if (!checkJointLimits(t7, 6))
              continue;
 
#ifdef DEBUG
            std::cout << "t5" << t5 << '\n';
            std::cout << "t7" << t7 << '\n';
#endif
            if (fabs(sin(t6) * sin(t7) - grhs_local(0, 1)) > IK_EPS ||
                fabs(cos(t7) * sin(t6) - grhs_local(0, 2)) > IK_EPS)
              continue;
 
            solution_ik[0] = normalize_angle(t1) * angle_multipliers_[0];
            solution_ik[1] = normalize_angle(t2) * angle_multipliers_[1];
            solution_ik[2] = normalize_angle(t3) * angle_multipliers_[2];
            solution_ik[3] = normalize_angle(t4) * angle_multipliers_[3];
            solution_ik[4] = normalize_angle(t5) * angle_multipliers_[4];
            solution_ik[5] = normalize_angle(t6) * angle_multipliers_[5];
            solution_ik[6] = normalize_angle(t7) * angle_multipliers_[6];
            solution.push_back(solution_ik);
 
#ifdef DEBUG
            std::cout << "SOLN " << solution_ik[0] << " " << solution_ik[1] << " " << solution_ik[2] << " "
                      << solution_ik[3] << " " << solution_ik[4] << " " << solution_ik[5] << " " << solution_ik[6]
                      << '\n'
                      << '\n';
#endif
          }
        }
      }
    }
  }
}
 
void PR2ArmIK::computeIKShoulderRoll(const Eigen::Isometry3f& g_in, const double& t3,
                                     std::vector<std::vector<double> >& solution) const
{
  std::vector<double> solution_ik(NUM_JOINTS_ARM7DOF, 0.0);
  //  ROS_INFO(" ");
  // solution_ik_.clear();
  //  ROS_INFO("Solution IK size: %d",solution_ik_.size());
  //  for(unsigned int i=0; i < solution_ik_.size(); ++i)
  //  {
  //    solution_ik_[i].clear();
  //  }
  //  if(!solution_ik_.empty())
  //    solution_ik_.resize(0);
  // t3 = shoulder/turret roll is specified
  Eigen::Isometry3f g = g_in;
  Eigen::Isometry3f gf_local = home_inv_;
  Eigen::Isometry3f grhs_local = home_inv_;
  // First bring everything into the arm frame
  g(0, 3) = g_in(0, 3) - torso_shoulder_offset_x_;
  g(1, 3) = g_in(1, 3) - torso_shoulder_offset_y_;
  g(2, 3) = g_in(2, 3) - torso_shoulder_offset_z_;
 
  if (!checkJointLimits(t3, 2))
  {
    return;
  }
  double x = g(0, 3);
  double y = g(1, 3);
  double z = g(2, 3);
  double cost1, cost2, cost3, cost4;
  double sint1, sint2, sint3, sint4;
 
  gf_local = g * home_inv_;
 
  cost3 = cos(t3);
  sint3 = sin(t3);
 
  double t1(0), t2(0), t4(0), t5(0), t6(0), t7(0);
 
  double at(0), bt(0), ct(0);
 
  double theta1[2], theta2[2], theta4[4], theta5[2], theta6[4], theta7[2];
 
  double c0 = -sin(-t3) * elbow_wrist_offset_;
  double c1 = -cos(-t3) * elbow_wrist_offset_;
 
  double d0 = 4 * shoulder_upperarm_offset_ * shoulder_upperarm_offset_ *
              (upperarm_elbow_offset_ * upperarm_elbow_offset_ + c1 * c1 - z * z);
  double d1 = 8 * shoulder_upperarm_offset_ * shoulder_upperarm_offset_ * upperarm_elbow_offset_ * elbow_wrist_offset_;
  double d2 =
      4 * shoulder_upperarm_offset_ * shoulder_upperarm_offset_ * (elbow_wrist_offset_ * elbow_wrist_offset_ - c1 * c1);
 
  double b0 = x * x + y * y + z * z - shoulder_upperarm_offset_ * shoulder_upperarm_offset_ -
              upperarm_elbow_offset_ * upperarm_elbow_offset_ - c0 * c0 - c1 * c1;
  double b1 = -2 * upperarm_elbow_offset_ * elbow_wrist_offset_;
 
  if (!solveQuadratic(b1 * b1 - d2, 2 * b0 * b1 - d1, b0 * b0 - d0, &theta4[0], &theta4[1]))
  {
#ifdef DEBUG
    printf("No solution to quadratic eqn\n");
#endif
    return;
  }
  theta4[0] = acos(theta4[0]);
  theta4[2] = acos(theta4[1]);
  theta4[1] = -theta4[0];
  theta4[3] = -theta4[2];
 
  for (double theta : theta4)
  {
    t4 = theta;
 
    if (!checkJointLimits(t4, 3))
    {
      continue;
    }
    cost4 = cos(t4);
    sint4 = sin(t4);
#ifdef DEBUG
    std::cout << "t4 " << t4 << '\n';
#endif
    if (std::isnan(t4))
      continue;
    at = cos(t3) * sin(t4) * (shoulder_elbow_offset_ - shoulder_wrist_offset_);
    bt = (shoulder_upperarm_offset_ - shoulder_elbow_offset_ +
          (shoulder_elbow_offset_ - shoulder_wrist_offset_) * cos(t4));
    ct = z;
 
    if (!solveCosineEqn(at, bt, ct, theta2[0], theta2[1]))
      continue;
 
    for (double theta : theta2)
    {
      t2 = theta;
#ifdef DEBUG
      std::cout << "t2 " << t2 << '\n';
#endif
      if (!checkJointLimits(t2, 1))
      {
        continue;
      }
 
      sint2 = sin(t2);
      cost2 = cos(t2);
 
      at = -y;
      bt = x;
      ct = (shoulder_elbow_offset_ - shoulder_wrist_offset_) * sin(t3) * sin(t4);
      if (!solveCosineEqn(at, bt, ct, theta1[0], theta1[1]))
      {
#ifdef DEBUG
        std::cout << "could not solve cosine equation for t1" << '\n';
#endif
        continue;
      }
 
      for (double theta : theta1)
      {
        t1 = theta;
#ifdef DEBUG
        std::cout << "t1 " << t1 << '\n';
#endif
        if (!checkJointLimits(t1, 0))
        {
          continue;
        }
        sint1 = sin(t1);
        cost1 = cos(t1);
        if (fabs((shoulder_upperarm_offset_ - shoulder_elbow_offset_ +
                  (shoulder_elbow_offset_ - shoulder_wrist_offset_) * cost4) *
                     sint2 +
                 (shoulder_elbow_offset_ - shoulder_wrist_offset_) * cost2 * cost3 * sint4 - z) > IK_EPS)
        {
#ifdef DEBUG
          printf("z value not matched %f\n",
                 fabs((shoulder_upperarm_offset_ - shoulder_elbow_offset_ +
                       (shoulder_elbow_offset_ - shoulder_wrist_offset_) * cost4) *
                          sint2 +
                      (shoulder_elbow_offset_ - shoulder_wrist_offset_) * cost2 * cost3 * sint4 - z));
#endif
          continue;
        }
        if (fabs((shoulder_elbow_offset_ - shoulder_wrist_offset_) * sint1 * sint3 * sint4 +
                 cost1 * (shoulder_upperarm_offset_ +
                          cost2 * (-shoulder_upperarm_offset_ + shoulder_elbow_offset_ +
                                   (-shoulder_elbow_offset_ + shoulder_wrist_offset_) * cost4) +
                          (shoulder_elbow_offset_ - shoulder_wrist_offset_) * cost3 * sint2 * sint4) -
                 x) > IK_EPS)
        {
#ifdef DEBUG
          printf("x value not matched by %f\n",
                 fabs((shoulder_elbow_offset_ - shoulder_wrist_offset_) * sint1 * sint3 * sint4 +
                      cost1 * (shoulder_upperarm_offset_ +
                               cost2 * (-shoulder_upperarm_offset_ + shoulder_elbow_offset_ +
                                        (-shoulder_elbow_offset_ + shoulder_wrist_offset_) * cost4) +
                               (shoulder_elbow_offset_ - shoulder_wrist_offset_) * cost3 * sint2 * sint4) -
                      x));
#endif
          continue;
        }
        if (fabs(-(shoulder_elbow_offset_ - shoulder_wrist_offset_) * cost1 * sint3 * sint4 +
                 sint1 * (shoulder_upperarm_offset_ +
                          cost2 * (-shoulder_upperarm_offset_ + shoulder_elbow_offset_ +
                                   (-shoulder_elbow_offset_ + shoulder_wrist_offset_) * cost4) +
                          (shoulder_elbow_offset_ - shoulder_wrist_offset_) * cost3 * sint2 * sint4) -
                 y) > IK_EPS)
        {
#ifdef DEBUG
          printf("y value not matched\n");
#endif
          continue;
        }
        grhs_local(0, 0) =
            cost4 * (gf_local(0, 0) * cost1 * cost2 + gf_local(1, 0) * cost2 * sint1 - gf_local(2, 0) * sint2) -
            (gf_local(2, 0) * cost2 * cost3 + cost3 * (gf_local(0, 0) * cost1 + gf_local(1, 0) * sint1) * sint2 +
             (-(gf_local(1, 0) * cost1) + gf_local(0, 0) * sint1) * sint3) *
                sint4;
 
        grhs_local(0, 1) =
            cost4 * (gf_local(0, 1) * cost1 * cost2 + gf_local(1, 1) * cost2 * sint1 - gf_local(2, 1) * sint2) -
            (gf_local(2, 1) * cost2 * cost3 + cost3 * (gf_local(0, 1) * cost1 + gf_local(1, 1) * sint1) * sint2 +
             (-(gf_local(1, 1) * cost1) + gf_local(0, 1) * sint1) * sint3) *
                sint4;
 
        grhs_local(0, 2) =
            cost4 * (gf_local(0, 2) * cost1 * cost2 + gf_local(1, 2) * cost2 * sint1 - gf_local(2, 2) * sint2) -
            (gf_local(2, 2) * cost2 * cost3 + cost3 * (gf_local(0, 2) * cost1 + gf_local(1, 2) * sint1) * sint2 +
             (-(gf_local(1, 2) * cost1) + gf_local(0, 2) * sint1) * sint3) *
                sint4;
 
        grhs_local(1, 0) = cost3 * (gf_local(1, 0) * cost1 - gf_local(0, 0) * sint1) + gf_local(2, 0) * cost2 * sint3 +
                           (gf_local(0, 0) * cost1 + gf_local(1, 0) * sint1) * sint2 * sint3;
 
        grhs_local(1, 1) = cost3 * (gf_local(1, 1) * cost1 - gf_local(0, 1) * sint1) + gf_local(2, 1) * cost2 * sint3 +
                           (gf_local(0, 1) * cost1 + gf_local(1, 1) * sint1) * sint2 * sint3;
 
        grhs_local(1, 2) = cost3 * (gf_local(1, 2) * cost1 - gf_local(0, 2) * sint1) + gf_local(2, 2) * cost2 * sint3 +
                           (gf_local(0, 2) * cost1 + gf_local(1, 2) * sint1) * sint2 * sint3;
 
        grhs_local(2, 0) =
            cost4 *
                (gf_local(2, 0) * cost2 * cost3 + cost3 * (gf_local(0, 0) * cost1 + gf_local(1, 0) * sint1) * sint2 +
                 (-(gf_local(1, 0) * cost1) + gf_local(0, 0) * sint1) * sint3) +
            (gf_local(0, 0) * cost1 * cost2 + gf_local(1, 0) * cost2 * sint1 - gf_local(2, 0) * sint2) * sint4;
 
        grhs_local(2, 1) =
            cost4 *
                (gf_local(2, 1) * cost2 * cost3 + cost3 * (gf_local(0, 1) * cost1 + gf_local(1, 1) * sint1) * sint2 +
                 (-(gf_local(1, 1) * cost1) + gf_local(0, 1) * sint1) * sint3) +
            (gf_local(0, 1) * cost1 * cost2 + gf_local(1, 1) * cost2 * sint1 - gf_local(2, 1) * sint2) * sint4;
 
        grhs_local(2, 2) =
            cost4 *
                (gf_local(2, 2) * cost2 * cost3 + cost3 * (gf_local(0, 2) * cost1 + gf_local(1, 2) * sint1) * sint2 +
                 (-(gf_local(1, 2) * cost1) + gf_local(0, 2) * sint1) * sint3) +
            (gf_local(0, 2) * cost1 * cost2 + gf_local(1, 2) * cost2 * sint1 - gf_local(2, 2) * sint2) * sint4;
 
        double val1 = sqrt(grhs_local(0, 1) * grhs_local(0, 1) + grhs_local(0, 2) * grhs_local(0, 2));
        double val2 = grhs_local(0, 0);
 
        theta6[0] = atan2(val1, val2);
        theta6[1] = atan2(-val1, val2);
 
        for (int mm = 0; mm < 2; ++mm)
        {
          t6 = theta6[mm];
#ifdef DEBUG
          std::cout << "t6 " << t6 << '\n';
#endif
          if (!checkJointLimits(t6, 5))
          {
            continue;
          }
 
          if (fabs(cos(t6) - grhs_local(0, 0)) > IK_EPS)
            continue;
 
          if (fabs(sin(t6)) < IK_EPS)
          {
            //                std::cout << "Singularity" << '\n';
            theta5[0] = acos(grhs_local(1, 1)) / 2.0;
            theta7[0] = theta5[0];
            //            theta7[1] = M_PI+theta7[0];
            //            theta5[1] = theta7[1];
          }
          else
          {
            theta7[0] = atan2(grhs_local(0, 1) / sin(t6), grhs_local(0, 2) / sin(t6));
            theta5[0] = atan2(grhs_local(1, 0) / sin(t6), -grhs_local(2, 0) / sin(t6));
            //            theta7[1] = M_PI+theta7[0];
            //            theta5[1] = M_PI+theta5[0];
          }
          for (int lll = 0; lll < 1; ++lll)
          {
            t5 = theta5[lll];
            t7 = theta7[lll];
 
            if (!checkJointLimits(t5, 4))
            {
              continue;
            }
            if (!checkJointLimits(t7, 6))
            {
              continue;
            }
 
#ifdef DEBUG
            std::cout << "t5 " << t5 << '\n';
            std::cout << "t7 " << t7 << '\n';
#endif
            //           if(fabs(sin(t6)*sin(t7)-grhs_local(0,1)) > IK_EPS || fabs(cos(t7)*sin(t6)-grhs_local(0,2)) > IK_EPS)
            //  continue;
 
#ifdef DEBUG
            std::cout << "theta1: " << t1 << '\n';
            std::cout << "theta2: " << t2 << '\n';
            std::cout << "theta3: " << t3 << '\n';
            std::cout << "theta4: " << t4 << '\n';
            std::cout << "theta5: " << t5 << '\n';
            std::cout << "theta6: " << t6 << '\n';
            std::cout << "theta7: " << t7 << '\n' << '\n' << '\n';
#endif
 
            solution_ik[0] = normalize_angle(t1 * angle_multipliers_[0]);
            solution_ik[1] = normalize_angle(t2 * angle_multipliers_[1]);
            solution_ik[2] = t3 * angle_multipliers_[2];
            solution_ik[3] = normalize_angle(t4 * angle_multipliers_[3]);
            solution_ik[4] = normalize_angle(t5 * angle_multipliers_[4]);
            solution_ik[5] = normalize_angle(t6 * angle_multipliers_[5]);
            solution_ik[6] = normalize_angle(t7 * angle_multipliers_[6]);
            solution.push_back(solution_ik);
#ifdef DEBUG
            std::cout << "SOLN " << solution_ik[0] << " " << solution_ik[1] << " " << solution_ik[2] << " "
                      << solution_ik[3] << " " << solution_ik[4] << " " << solution_ik[5] << " " << solution_ik[6]
                      << '\n'
                      << '\n';
#endif
          }
        }
      }
    }
  }
}
 
bool PR2ArmIK::checkJointLimits(const std::vector<double>& joint_values) const
{
  for (int i = 0; i < NUM_JOINTS_ARM7DOF; ++i)
  {
    if (!checkJointLimits(angles::normalize_angle(joint_values[i] * angle_multipliers_[i]), i))
    {
      return false;
    }
  }
  return true;
}
 
bool PR2ArmIK::checkJointLimits(const double& joint_value, const int& joint_num) const
{
  double jv;
  if (continuous_joint_[joint_num])
    jv = angles::normalize_angle(joint_value * angle_multipliers_[joint_num]);
  else if (joint_num == 2)
    jv = joint_value * angle_multipliers_[joint_num];
  else
    jv = angles::normalize_angle(joint_value * angle_multipliers_[joint_num]);
 
  return !(jv < min_angles_[joint_num] || jv > max_angles_[joint_num]);
}
}  // namespace pr2_arm_kinematics