voxel_markers.cpp

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 * Author: Eitan Marder-Eppstein
 *         David V. Lu!!
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#include <ros/ros.h>
#include <visualization_msgs/MarkerArray.h>
#include <costmap_2d/VoxelGrid.h>
#include <voxel_grid/voxel_grid.h>

struct Cell
{
  double x;
  double y;
  double z;
  voxel_grid::VoxelStatus status;
};
typedef std::vector<Cell> V_Cell;

float g_colors_r[] = {0.0f, 1.0f, 1.0f};
float g_colors_g[] = {1.0f, 1.0f, 0.0f};
float g_colors_b[] = {1.0f, 1.0f, 0.0f};
float g_colors_a[] = {0.5f, 0.1f, 0.5f};

std::string g_marker_ns;
V_Cell g_cells;
int g_cell_type;
void voxelCallback(const ros::Publisher& pub, const costmap_2d::VoxelGridConstPtr& grid)
{
  if (grid->data.empty())
  {
    ROS_ERROR("Received empty voxel grid");
    return;
  }

  ros::WallTime start = ros::WallTime::now();

  ROS_DEBUG("Received voxel grid");
  const std::string frame_id = grid->header.frame_id;
  const ros::Time stamp = grid->header.stamp;
  const uint32_t* data = &grid->data.front();
  const double x_origin = grid->origin.x;
  const double y_origin = grid->origin.y;
  const double z_origin = grid->origin.z;
  const double x_res = grid->resolutions.x;
  const double y_res = grid->resolutions.y;
  const double z_res = grid->resolutions.z;
  const uint32_t x_size = grid->size_x;
  const uint32_t y_size = grid->size_y;
  const uint32_t z_size = grid->size_z;

  g_cells.clear();
  uint32_t num_markers = 0;
  for (uint32_t y_grid = 0; y_grid < y_size; ++y_grid)
  {
    for (uint32_t x_grid = 0; x_grid < x_size; ++x_grid)
    {
      for (uint32_t z_grid = 0; z_grid < z_size; ++z_grid)
      {
        voxel_grid::VoxelStatus status = voxel_grid::VoxelGrid::getVoxel(x_grid, y_grid, z_grid, x_size, y_size, z_size,
                                                                         data);

        if (status == (voxel_grid::VoxelStatus)g_cell_type)
        {
          Cell c;
          c.status = status;
          c.x = x_origin + (x_grid + 0.5) * x_res;
          c.y = y_origin + (y_grid + 0.5) * y_res;
          c.z = z_origin + (z_grid + 0.5) * z_res;
          g_cells.push_back(c);

          ++num_markers;
        }
      }
    }
  }

  visualization_msgs::Marker m;
  m.header.frame_id = frame_id;
  m.header.stamp = stamp;
  m.ns = g_marker_ns;
  m.id = 0;
  m.type = visualization_msgs::Marker::CUBE_LIST;
  m.action = visualization_msgs::Marker::ADD;
  m.pose.orientation.w = 1.0;
  m.scale.x = x_res;
  m.scale.y = y_res;
  m.scale.z = z_res;
  m.color.r = g_colors_r[g_cell_type];
  m.color.g = g_colors_g[g_cell_type];
  m.color.b = g_colors_b[g_cell_type];
  m.color.a = g_colors_a[g_cell_type];
  m.points.resize(num_markers);
  for (uint32_t i = 0; i < num_markers; ++i)
  {
    Cell& c = g_cells[i];
    geometry_msgs::Point& p = m.points[i];
    p.x = c.x;
    p.y = c.y;
    p.z = c.z;
  }

  pub.publish(m);

  ros::WallTime end = ros::WallTime::now();
  ROS_DEBUG("Published %d markers in %f seconds", num_markers, (end - start).toSec());
}

ros::Publisher pub;
ros::Subscriber sub;
void connectCb()
{
        ros::NodeHandle n;
        sub = n.subscribe < costmap_2d::VoxelGrid > ("voxel_grid", 1, boost::bind(voxelCallback, pub, boost::placeholders::_1));
}

void disconnectCb()
{
        if(pub.getNumSubscribers()==0)
                sub.shutdown();
}

int main(int argc, char** argv)
{
  ros::init(argc, argv, "3d_markers");
  ros::NodeHandle n;
  ros::NodeHandle pnh("~");
 
  pnh.param("cell_type", g_cell_type, (int)voxel_grid::MARKED);
  pnh.param("r", g_colors_r[g_cell_type], g_colors_r[g_cell_type]);
  pnh.param("g", g_colors_g[g_cell_type], g_colors_g[g_cell_type]);
  pnh.param("b", g_colors_b[g_cell_type], g_colors_b[g_cell_type]);
  pnh.param("a", g_colors_a[g_cell_type], g_colors_a[g_cell_type]);

  ROS_DEBUG("Startup");

  ros::SubscriberStatusCallback connect_cb = boost::bind(connectCb);
  ros::SubscriberStatusCallback disconnect_cb = boost::bind(disconnectCb);

  pub = n.advertise < visualization_msgs::Marker > ("visualization_marker", 1, connect_cb, disconnect_cb);
  g_marker_ns = n.resolveName("voxel_grid");

  ros::spin();
}