1 教程上的simple_marker解析

官方教程越寫越不走心了
前面的教程，運(yùn)行例子simple_marker，就是下面這個：

simple_marker

the current position of the marker

下面是源碼:

#include <ros/ros.h>

#include <interactive_markers/interactive_marker_server.h>

void processFeedback(
    const visualization_msgs::InteractiveMarkerFeedbackConstPtr &feedback )
{
  ROS_INFO_STREAM( feedback->marker_name << " is now at "
      << feedback->pose.position.x << ", " << feedback->pose.position.y
      << ", " << feedback->pose.position.z );
}

int main(int argc, char** argv)
{
  ros::init(argc, argv, "simple_marker");

  // create an interactive marker server on the topic namespace simple_marker
  interactive_markers::InteractiveMarkerServer server("simple_marker");

  // create an interactive marker for our server
  visualization_msgs::InteractiveMarker int_marker;
  int_marker.header.frame_id = "base_link";
  int_marker.header.stamp=ros::Time::now();
  int_marker.name = "my_marker";
  int_marker.description = "Simple 1-DOF Control";

  // create a grey box marker
  visualization_msgs::Marker box_marker;
  box_marker.type = visualization_msgs::Marker::CUBE;
  box_marker.scale.x = 0.45;
  box_marker.scale.y = 0.45;
  box_marker.scale.z = 0.45;
  box_marker.color.r = 0.5;
  box_marker.color.g = 0.5;
  box_marker.color.b = 0.5;
  box_marker.color.a = 1.0;

  // create a non-interactive control which contains the box
  visualization_msgs::InteractiveMarkerControl box_control;
  box_control.always_visible = true;
  box_control.markers.push_back( box_marker );

  // add the control to the interactive marker
  int_marker.controls.push_back( box_control );

  // create a control which will move the box
  // this control does not contain any markers,
  // which will cause RViz to insert two arrows
  visualization_msgs::InteractiveMarkerControl rotate_control;
  rotate_control.name = "move_x";
  rotate_control.interaction_mode =
      visualization_msgs::InteractiveMarkerControl::MOVE_AXIS;

  // add the control to the interactive marker
  int_marker.controls.push_back(rotate_control);

  // add the interactive marker to our collection &
  // tell the server to call processFeedback() when feedback arrives for it
  server.insert(int_marker, &processFeedback);

  // 'commit' changes and send to all clients
  server.applyChanges();

  // start the ROS main loop
  ros::spin();
}

這段程序主要做了以下事：

• 定義了一個函數(shù)processFeedback ，它用來處理來自RViz的反饋消息，把它們打印出來。
• 初始化roscpp
• 創(chuàng)建一個交互式Marker 服務(wù)對象
• 設(shè)置交互式Marker并且把它添加到服務(wù)
• 進(jìn)入ROS消息循環(huán)
  程序里也有比較詳盡的注釋。