costmap_2d_publisher.cpp
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00022  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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00035  * Author: Eitan Marder-Eppstein
00036  *         David V. Lu!!
00037  *********************************************************************/
00038 #include <boost/bind.hpp>
00039 #include <costmap_2d/costmap_2d_publisher.h>
00040 #include <costmap_2d/cost_values.h>
00041 
00042 namespace costmap_2d
00043 {
00044 
00045 char* Costmap2DPublisher::cost_translation_table_ = NULL;
00046 
00047 Costmap2DPublisher::Costmap2DPublisher(ros::NodeHandle * ros_node, Costmap2D* costmap, std::string global_frame,
00048                                        std::string topic_name, bool always_send_full_costmap) :
00049     node(ros_node), costmap_(costmap), global_frame_(global_frame), active_(false),
00050     always_send_full_costmap_(always_send_full_costmap)
00051 {
00052   costmap_pub_ = ros_node->advertise<nav_msgs::OccupancyGrid>(topic_name, 1,
00053                                                     boost::bind(&Costmap2DPublisher::onNewSubscription, this, _1));
00054   costmap_update_pub_ = ros_node->advertise<map_msgs::OccupancyGridUpdate>(topic_name + "_updates", 1);
00055 
00056   if (cost_translation_table_ == NULL)
00057   {
00058     cost_translation_table_ = new char[256];
00059 
00060     // special values:
00061     cost_translation_table_[0] = 0;  // NO obstacle
00062     cost_translation_table_[253] = 99;  // INSCRIBED obstacle
00063     cost_translation_table_[254] = 100;  // LETHAL obstacle
00064     cost_translation_table_[255] = -1;  // UNKNOWN
00065 
00066     // regular cost values scale the range 1 to 252 (inclusive) to fit
00067     // into 1 to 98 (inclusive).
00068     for (int i = 1; i < 253; i++)
00069     {
00070       cost_translation_table_[ i ] = char(1 + (97 * (i - 1)) / 251);
00071     }
00072   }
00073 
00074   xn_ = yn_ = 0;
00075   x0_ = costmap_->getSizeInCellsX();
00076   y0_ = costmap_->getSizeInCellsY();
00077 }
00078 
00079 Costmap2DPublisher::~Costmap2DPublisher()
00080 {
00081 }
00082 
00083 void Costmap2DPublisher::onNewSubscription(const ros::SingleSubscriberPublisher& pub)
00084 {
00085   prepareGrid();
00086   pub.publish(grid_);
00087 }
00088 
00089 // prepare grid_ message for publication.
00090 void Costmap2DPublisher::prepareGrid()
00091 {
00092   boost::unique_lock<Costmap2D::mutex_t> lock(*(costmap_->getMutex()));
00093   double resolution = costmap_->getResolution();
00094 
00095   grid_.header.frame_id = global_frame_;
00096   grid_.header.stamp = ros::Time::now();
00097   grid_.info.resolution = resolution;
00098 
00099   grid_.info.width = costmap_->getSizeInCellsX();
00100   grid_.info.height = costmap_->getSizeInCellsY();
00101 
00102   double wx, wy;
00103   costmap_->mapToWorld(0, 0, wx, wy);
00104   grid_.info.origin.position.x = wx - resolution / 2;
00105   grid_.info.origin.position.y = wy - resolution / 2;
00106   grid_.info.origin.position.z = 0.0;
00107   grid_.info.origin.orientation.w = 1.0;
00108   saved_origin_x_ = costmap_->getOriginX();
00109   saved_origin_y_ = costmap_->getOriginY();
00110 
00111   grid_.data.resize(grid_.info.width * grid_.info.height);
00112 
00113   unsigned char* data = costmap_->getCharMap();
00114   for (unsigned int i = 0; i < grid_.data.size(); i++)
00115   {
00116     grid_.data[i] = cost_translation_table_[ data[ i ]];
00117   }
00118 }
00119 
00120 void Costmap2DPublisher::publishCostmap()
00121 {
00122   if (costmap_pub_.getNumSubscribers() == 0)
00123   {
00124     // No subscribers, so why do any work?
00125     return;
00126   }
00127 
00128   float resolution = costmap_->getResolution();
00129 
00130   if (always_send_full_costmap_ || grid_.info.resolution != resolution ||
00131       grid_.info.width != costmap_->getSizeInCellsX() ||
00132       grid_.info.height != costmap_->getSizeInCellsY() ||
00133       saved_origin_x_ != costmap_->getOriginX() ||
00134       saved_origin_y_ != costmap_->getOriginY())
00135   {
00136     prepareGrid();
00137     costmap_pub_.publish(grid_);
00138   }
00139   else if (x0_ < xn_)
00140   {
00141     boost::unique_lock<Costmap2D::mutex_t> lock(*(costmap_->getMutex()));
00142     // Publish Just an Update
00143     map_msgs::OccupancyGridUpdate update;
00144     update.header.stamp = ros::Time::now();
00145     update.header.frame_id = global_frame_;
00146     update.x = x0_;
00147     update.y = y0_;
00148     update.width = xn_ - x0_;
00149     update.height = yn_ - y0_;
00150     update.data.resize(update.width * update.height);
00151 
00152     unsigned int i = 0;
00153     for (unsigned int y = y0_; y < yn_; y++)
00154     {
00155       for (unsigned int x = x0_; x < xn_; x++)
00156       {
00157         unsigned char cost = costmap_->getCost(x, y);
00158         update.data[i++] = cost_translation_table_[ cost ];
00159       }
00160     }
00161     costmap_update_pub_.publish(update);
00162   }
00163 
00164   xn_ = yn_ = 0;
00165   x0_ = costmap_->getSizeInCellsX();
00166   y0_ = costmap_->getSizeInCellsY();
00167 }
00168 
00169 }  // end namespace costmap_2d


costmap_2d
Author(s): Eitan Marder-Eppstein, David V. Lu!!, Dave Hershberger, contradict@gmail.com
autogenerated on Wed Aug 2 2017 03:12:21