view_interval.cpp

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#include <cstdio>
#include <ros/ros.h>
#include <calibration_msgs/Interval.h>

void intervalCallback(const calibration_msgs::IntervalConstPtr& msg)
{
  ros::Duration time_left = msg->end - msg->start;

  printf("[%.3fs]: ", time_left.toSec());
  while (time_left > ros::Duration(0,0))
  {
    printf("*");
    time_left = time_left - ros::Duration().fromSec(.25);
  }
  printf("\n");
}

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

  ros::NodeHandle n;

  ros::Subscriber sub = n.subscribe("interval", 1, &intervalCallback);

  ros::spin();
}