Franka机械臂代码学习——generate_joint_position_motion.cpp例程_position joint interface

该例程是给出机械臂的七个关节角，控制机械臂的运动。

#include <cmath>     
// 是C++语言中标准库头文件
#include <iostream>
 
#include <franka/exception.h>
#include <franka/robot.h>
 
#include "examples_common.h"
 
/**
 * @example generate_joint_position_motion.cpp
 * An example showing how to generate a joint position motion.
 *
 * @warning 注意！！！在运行本例程之前确保机械臂前方有足够的空间
 */
 
int main(int argc, char** argv) {
  if (argc != 2) {
    std::cerr << "Usage: " << argv[0] << " <robot-hostname>" << std::endl;
    return -1;
  }
  try {
    franka::Robot robot(argv[1]);
    setDefaultBehavior(robot);    // 设置默认碰撞行为、关节阻抗、笛卡尔阻抗和滤波器频率
 
    // 首先让机械臂运动到一个合适的关节空间
    std::array<double, 7> q_goal = {{0, -M_PI_4, 0, -3 * M_PI_4, 0, M_PI_2, M_PI_4}};
    MotionGenerator motion_generator(0.5, q_goal);     
    // MotionGenerator (double speed_factor, const std::array< double, 7 > q_goal)
    std::cout << "WARNING: This example will move the robot! "
              << "Please make sure to have the user stop button at hand!" << std::endl
              << "Press Enter to continue..." << std::endl;
    std::cin.ignore();
    robot.control(motion_generator);
    std::cout << "Finished moving to initial joint configuration." << std::endl;
 
    // 始终在控制回路之前设置附加参数,不要在控制回路中！！！
    // 设置碰撞行为
    robot.setCollisionBehavior(
        {{20.0, 20.0, 18.0, 18.0, 16.0, 14.0, 12.0}}, {{20.0, 20.0, 18.0, 18.0, 16.0, 14.0, 12.0}},
        {{20.0, 20.0, 18.0, 18.0, 16.0, 14.0, 12.0}}, {{20.0, 20.0, 18.0, 18.0, 16.0, 14.0, 12.0}},
        {{20.0, 20.0, 20.0, 25.0, 25.0, 25.0}}, {{20.0, 20.0, 20.0, 25.0, 25.0, 25.0}},
        {{20.0, 20.0, 20.0, 25.0, 25.0, 25.0}}, {{20.0, 20.0, 20.0, 25.0, 25.0, 25.0}});
    // 设置转矩和力的阈值，大于这个阈值说明碰撞了
 
    std::array<double, 7> initial_position;
    double time = 0.0;
    robot.control([&initial_position, &time](const franka::RobotState& robot_state,
                                             franka::Duration period) -> franka::JointPositions {
      time += period.toSec();
 
      if (time == 0.0) {
        initial_position = robot_state.q_d;
      }
 
      double delta_angle = M_PI / 8.0 * (1 - std::cos(M_PI / 2.5 * time));
 
      franka::JointPositions output = {{initial_position[0], initial_position[1],
                                        initial_position[2], initial_position[3] + delta_angle,
                                        initial_position[4] + delta_angle, initial_position[5],
                                        initial_position[6] + delta_angle}};
 
      if (time >= 5.0) {
        std::cout << std::endl << "Finished motion, shutting down example" << std::endl;
        return franka::MotionFinished(output);
      }
      return output;
    });
  } catch (const franka::Exception& e) {
    std::cout << e.what() << std::endl;
    return -1;
  }
 
  return 0;
}