inflation_layer.h

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#ifndef COSTMAP_2D_INFLATION_LAYER_H_
#define COSTMAP_2D_INFLATION_LAYER_H_

#include <ros/ros.h>
#include <costmap_2d/layer.h>
#include <costmap_2d/layered_costmap.h>
#include <costmap_2d/InflationPluginConfig.h>
#include <dynamic_reconfigure/server.h>
#include <queue>

namespace costmap_2d
{
class CellData
{
public:
  CellData(double d, double i, unsigned int x, unsigned int y, unsigned int sx, unsigned int sy) :
      distance_(d), index_(i), x_(x), y_(y), src_x_(sx), src_y_(sy)
  {
  }
  double distance_;
  unsigned int index_;
  unsigned int x_, y_;
  unsigned int src_x_, src_y_;
};

inline bool operator<(const CellData &a, const CellData &b)
{
  return a.distance_ > b.distance_;
}

class InflationLayer : public Layer
{
public:
  InflationLayer();

  virtual ~InflationLayer()
  {
    deleteKernels();
    if(dsrv_)
        delete dsrv_;
  }

  virtual void onInitialize();
  virtual void updateBounds(double robot_x, double robot_y, double robot_yaw, double* min_x, double* min_y, double* max_x,
                             double* max_y);
  virtual void updateCosts(costmap_2d::Costmap2D& master_grid, int min_i, int min_j, int max_i, int max_j);
  virtual bool isDiscretized()
  {
    return true;
  }
  virtual void matchSize();

  virtual void reset() { onInitialize(); }

  inline unsigned char computeCost(double distance) const
  {
    unsigned char cost = 0;
    if (distance == 0)
      cost = LETHAL_OBSTACLE;
    else if (distance * resolution_ <= inscribed_radius_)
      cost = INSCRIBED_INFLATED_OBSTACLE;
    else
    {
      //make sure cost falls off by Euclidean distance
      double euclidean_distance = distance * resolution_;
      double factor = exp(-1.0 * weight_ * (euclidean_distance - inscribed_radius_));
      cost = (unsigned char)((INSCRIBED_INFLATED_OBSTACLE - 1) * factor);
    }
    return cost;
  }

protected:
  virtual void onFootprintChanged();
  boost::shared_mutex* access_;

private:
  inline double distanceLookup(int mx, int my, int src_x, int src_y)
  {
    unsigned int dx = abs(mx - src_x);
    unsigned int dy = abs(my - src_y);
    return cached_distances_[dx][dy];
  }

  inline unsigned char costLookup(int mx, int my, int src_x, int src_y)
  {
    unsigned int dx = abs(mx - src_x);
    unsigned int dy = abs(my - src_y);
    return cached_costs_[dx][dy];
  }

  void computeCaches();
  void deleteKernels();
  void inflate_area(int min_i, int min_j, int max_i, int max_j, unsigned char* master_grid);

  unsigned int cellDistance(double world_dist)
  {
    return layered_costmap_->getCostmap()->cellDistance(world_dist);
  }

  inline void enqueue(unsigned char* grid, unsigned int index, unsigned int mx, unsigned int my, unsigned int src_x,
                      unsigned int src_y);

  double inflation_radius_, inscribed_radius_, weight_;
  unsigned int cell_inflation_radius_;
  unsigned int cached_cell_inflation_radius_;
  std::priority_queue<CellData> inflation_queue_;

  double resolution_;

  bool* seen_;

  unsigned char** cached_costs_;
  double** cached_distances_;

  dynamic_reconfigure::Server<costmap_2d::InflationPluginConfig> *dsrv_;
  void reconfigureCB(costmap_2d::InflationPluginConfig &config, uint32_t level);

  bool need_reinflation_; 
};

}  // namespace costmap_2d

#endif  // COSTMAP_2D_INFLATION_LAYER_H_