hz_measure_nodelet.cpp
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00034 
00035 #include <pluginlib/class_list_macros.h>
00036 #include "jsk_topic_tools/hz_measure_nodelet.h"
00037 
00038 #include "std_msgs/Float32.h"
00039 
00040 namespace jsk_topic_tools
00041 {
00042   void HzMeasure::onInit()
00043   {
00044     pnh_ = getPrivateNodeHandle();
00045     if (!pnh_.getParam("message_num", average_message_num_)) {
00046       average_message_num_ = 10; // defaults to 10
00047     }
00048     hz_pub_ = pnh_.advertise<std_msgs::Float32>("output", 1);
00049     sub_ = pnh_.subscribe<topic_tools::ShapeShifter>("input", 1,
00050                                                      &HzMeasure::inputCallback, this);
00051   }
00052 
00053   void HzMeasure::inputCallback(const boost::shared_ptr<topic_tools::ShapeShifter const>& msg)
00054   {
00055     ros::Time now = ros::Time::now();
00056     buffer_.push(now);
00057     if (buffer_.size() > average_message_num_) {
00058       ros::Time oldest = buffer_.front();
00059       double whole_time = (now - oldest).toSec();
00060       double average_time = whole_time / (buffer_.size() - 1);
00061       std_msgs::Float32 output;
00062       output.data = 1.0 / average_time;
00063       hz_pub_.publish(output);
00064       buffer_.pop();
00065     }
00066     else {
00067       NODELET_DEBUG("there is no enough messages yet");
00068     }
00069   }
00070   
00071 }
00072 
00073 typedef jsk_topic_tools::HzMeasure HzMeasure;
00074 PLUGINLIB_EXPORT_CLASS(HzMeasure, nodelet::Nodelet)


jsk_topic_tools
Author(s): Kei Okada , Yusuke Furuta
autogenerated on Mon Oct 6 2014 10:56:17