add_smoothing_filter.cpp

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/* Author: Chris Lewis */

#include <moveit/planning_request_adapter/planning_request_adapter.h>
#include <class_loader/class_loader.h>

#include <industrial_trajectory_filters/smoothing_trajectory_filter.h>
#include <ros/ros.h>  // required for NodeHandle
#include <ros/console.h>

namespace industrial_trajectory_filters
{

class AddSmoothingFilter : public planning_request_adapter::PlanningRequestAdapter
{
public:

  static const std::string FILTER_PARAMETER_NAME_; // base name for filter parameters

  AddSmoothingFilter() : planning_request_adapter::PlanningRequestAdapter(), nh_("~")
  {
      int num_coef;

      // set of default filter coefficients in case paramter, or its associated file, or its syntax is wrong
      filter_coef_.push_back(0.25);
      filter_coef_.push_back(0.5);
      filter_coef_.push_back(1.0);
      filter_coef_.push_back(0.5);
      filter_coef_.push_back(0.25);

    // see if a new set of filter parameters is on the parameter server, if so, install them
    if (!nh_.getParam(FILTER_PARAMETER_NAME_, filter_name_)){
      ROS_INFO_STREAM("Param '" << FILTER_PARAMETER_NAME_ << "' was not set. Using default filter values " );
    }
    else{ // base filter name exists
      std::vector<double> temp_coef;
      nh_.getParam(filter_name_.c_str(),temp_coef); // no need to check for success
      if(temp_coef.size()%2 == 1 && temp_coef.size()>2){ // need to have odd number of coefficients greater than 2
        filter_coef_.clear();
        for(int i=0; i< (int) temp_coef.size(); i++){ // install the filter coefficients
          filter_coef_.push_back(temp_coef[i]);
        }
      }
      else{
        ROS_INFO_STREAM("Could not read filter, using default filter coefficients");
      }
    }
    if(!smoothing_filter_.init(filter_coef_))
      ROS_ERROR("Initialization error on smoothing filter. Requires an odd number of coeficients");
    
  };

  ~AddSmoothingFilter(){ };

  virtual std::string getDescription() const { return "Add Smoothing Trajectory Filter"; }

  virtual bool adaptAndPlan(const PlannerFn &planner,
                            const planning_scene::PlanningSceneConstPtr& planning_scene,
                            const planning_interface::MotionPlanRequest &req,
                            planning_interface::MotionPlanResponse &res,
                            std::vector<std::size_t> &added_path_index) const
  {
    // do anything prior to calling the planner here
    // ....
    // IN this case nothing was done

    // call the nested planner or adapter
    bool result = planner(planning_scene, req, res); 

    // do anything after calling the nested planner or adapters here
    if (result && res.trajectory_) // successful plan
    {
      ROS_DEBUG("Running '%s'", getDescription().c_str()); // inform the user 
      if (!smoothing_filter_.applyFilter(*res.trajectory_)) {// do the smoothing
        ROS_ERROR("Smoothing filter of the solution path failed. Filter Not Initialized ");
      }
    }// end of if successful plan
    return result;
  };
  

private:
  ros::NodeHandle nh_;
  industrial_trajectory_filters::SmoothingTrajectoryFilter smoothing_filter_;
  std::string filter_name_;
  std::vector<double> filter_coef_;

};

const std::string  AddSmoothingFilter::FILTER_PARAMETER_NAME_ = "/move_group/smoothing_filter_name";

}

CLASS_LOADER_REGISTER_CLASS(industrial_trajectory_filters::AddSmoothingFilter,
                            planning_request_adapter::PlanningRequestAdapter);