angular_bounds_filter_in_place.h

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* Author: Kevin Hallenbeck
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#ifndef LASER_SCAN_ANGULAR_BOUNDS_FILTER_IN_PLACE_H
#define LASER_SCAN_ANGULAR_BOUNDS_FILTER_IN_PLACE_H

#include <filters/filter_base.h>
#include <sensor_msgs/LaserScan.h>

namespace laser_filters
{
  class LaserScanAngularBoundsFilterInPlace : public filters::FilterBase<sensor_msgs::LaserScan>
  {
    public:
      double lower_angle_;
      double upper_angle_;

      bool configure()
      {
        lower_angle_ = 0;
        upper_angle_ = 0;

        if(!getParam("lower_angle", lower_angle_) || !getParam("upper_angle", upper_angle_)){
          ROS_ERROR("Both the lower_angle and upper_angle parameters must be set to use this filter.");
          return false;
        }

        return true;
      }

      virtual ~LaserScanAngularBoundsFilterInPlace(){}

      bool update(const sensor_msgs::LaserScan& input_scan, sensor_msgs::LaserScan& filtered_scan){
        filtered_scan = input_scan; //copy entire message

        double current_angle = input_scan.angle_min;
        unsigned int count = 0;
        //loop through the scan and remove ranges at angles between lower_angle_ and upper_angle_
        for(unsigned int i = 0; i < input_scan.ranges.size(); ++i){
          if((current_angle > lower_angle_) && (current_angle < upper_angle_)){
            filtered_scan.ranges[i] = input_scan.range_max + 1.0;
            if(i < filtered_scan.intensities.size()){
              filtered_scan.intensities[i] = 0.0;
            }
            count++;
          }
          current_angle += input_scan.angle_increment;
        }

        ROS_DEBUG("Filtered out %u points from the laser scan.", count);

        return true;

      }
  };
};
#endif