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grasp_pcd.cpp

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#include <ros/ros.h>
#include <sensor_msgs/PointCloud.h>
#include <SimpleGraspPlanner.h>
#include <geometry_msgs/Pose.h>


using namespace sensor_msgs;

bool s_need_cloud_data = true;
ros::Publisher pub;
std::string s_input_cloud_topic = "graspable_segments";
std::string s_output_cloud_topic = "hand_config";

double param_start_top = 0.0;
double param_start_side = 0.0;
void cloud_cb (const PointCloudConstPtr& cloud)
{
  /*
  Cite sgp:

  typedef struct
  {
     double sx; double sxy; double sxz;
     double syx; double sy; double syz;
      double szx; double szy; double sz;
  }
  CovariancePoint;
  */
  CovariancePoint cov;   
  Point3D mean, a, b, c1,c2,c3;
  mean.x = 0.0;
  mean.y = 0.0;
  mean.z = 0.0;
  for(size_t i = 0; i < (*cloud).points.size(); i++)
  {
    mean.x += (*cloud).points[i].x;
    mean.y += (*cloud).points[i].y;
    mean.z += (*cloud).points[i].z;
  }
  mean.x /=  (*cloud).points.size();
  mean.y /=  (*cloud).points.size();
  mean.z /=  (*cloud).points.size();
  cov.sx  = 0.0;
  cov.sxy = 0.0;
  cov.sxz = 0.0;
  cov.syx = 0.0;
  cov.sy  = 0.0;
  cov.syz = 0.0;
  cov.szx = 0.0;
  cov.szy = 0.0;
  cov.sz  = 0.0;
  for(size_t i = 0; i < (*cloud).points.size(); i++)
  {
     double tmpx = (*cloud).points[i].x - mean.x;
     double tmpy = (*cloud).points[i].y - mean.y;
     double tmpz = (*cloud).points[i].z - mean.z;

     cov.sx  += tmpx*tmpx;
     cov.sxy += tmpx*tmpy;
     cov.sxz += tmpx*tmpz;
     cov.syx += tmpy*tmpx;
     cov.sy  += tmpy*tmpy;
     cov.syz += tmpy*tmpz;
     cov.szx += tmpz*tmpx;
     cov.szy += tmpz*tmpy;
     cov.sz  += tmpz*tmpz;
  }
  cov.sx  /= (*cloud).points.size();
  cov.sxy /= (*cloud).points.size();
  cov.sxz /= (*cloud).points.size();
  cov.syx /= (*cloud).points.size();
  cov.sy  /= (*cloud).points.size();
  cov.syz /= (*cloud).points.size();
  cov.szx /= (*cloud).points.size();
  cov.szy /= (*cloud).points.size();
  cov.sz  /= (*cloud).points.size();
  HandConfig cfg = GetGraspLM(&mean, &cov,1, param_start_top, param_start_side);
  geometry_msgs::Point32 pout;
  pout.x= cfg.alpha;
  pout.y = cfg.beta;
  pout.z  = cfg.delta_max;
  b.x = 0.0;
  b.y = 0.0;
  b.z = 0.0;
  a.x = 1.0;
  a.y = 0.0;
  a.z = 0.0;
  c1 = TransformPoint(a, b, cfg.alpha, cfg.beta, cfg.delta_max) ;
  a.x = 0.0;
  a.y = 1.0;
  a.z = 0.0;
  c2 = TransformPoint(a, b, cfg.alpha, cfg.beta, cfg.delta_max) ;
  a.x = 0.0;
  a.y = 0.0;
  a.z = 1.0;
  c3 = TransformPoint(a, b, cfg.alpha, cfg.beta, cfg.delta_max) ;
  geometry_msgs::Pose pose;
  pose.position.x = 0.0;
  pose.position.y = 0.0;
  pose.position.z = 0.0;

  double S, T = 1 + c1.x + c2.y + c3.z;


  /* If the trace of the matrix is greater than zero, then
  perform an "instant" calculation.
  Important note wrt. rouning errors: */
  if ( T > 0.00000001 )
  {
      S = sqrt(T) * 2;
      pose.orientation.x = ( c2.z - c3.y ) / S;
      pose.orientation.y = ( c3.x - c1.z ) / S;
      pose.orientation.z = ( c1.y - c2.x ) / S;
      pose.orientation.w = 0.25 * S;
  }
  else
  {

    /*If the trace of the matrix is equal to zero then identify
    which major diagonal element has the greatest value.
    Deending on this, calculate the following:*/

    if ( c1.x > c2.y && c1.x > c3.z )  {        // Column 0:
        S  = sqrt( 1.0 + c1.x - c2.y - c3.z ) * 2;
        pose.orientation.x = 0.25 * S;
        pose.orientation.y = (c1.y + c2.x ) / S;
        pose.orientation.z = (c3.x + c1.z ) / S;
        pose.orientation.w = (c2.z - c3.y ) / S;
    } else if ( c2.y > c3.z ) {                 // Column 1:
        S  = sqrt( 1.0 + c2.y - c1.x - c3.z ) * 2;
        pose.orientation.x = (c1.y + c2.x ) / S;
        pose.orientation.y = 0.25 * S;
        pose.orientation.z = (c2.z + c3.y ) / S;
        pose.orientation.w = (c3.x - c1.z ) / S;
    } else {                                            // Column 2:
        S  = sqrt( 1.0 + c3.z - c1.x - c2.y ) * 2;
        pose.orientation.x = (c3.x + c1.z ) / S;
        pose.orientation.y = (c2.z + c3.y ) / S;
        pose.orientation.z = 0.25 * S;
        pose.orientation.w = (c1.y - c2.x ) / S;
    }
  }

  pub.publish(pose);
}

#ifndef MAX_HAND_POINTS
#define MAX_HAND_POINTS 100
#endif
Point3D hand_points[MAX_HAND_POINTS];

void GetParams(ros::NodeHandle &n)
{
  using namespace XmlRpc;
  int counting_hand_points = 0;

  if( n.hasParam( "sgp_config" ) )
  {
      XmlRpcValue sgp_config_param_value;
      n.getParam( "sgp_config", sgp_config_param_value );
      if( sgp_config_param_value.getType() != XmlRpcValue::TypeArray )
      {
          printf("Type %d\n", sgp_config_param_value.getType());
          ROS_WARN("sgp_config has invalid type.");
      }
      else
      {
        for(int i=0; i<sgp_config_param_value.size(); i++)
        {
            if( sgp_config_param_value[i].getType() != XmlRpcValue::TypeArray && sgp_config_param_value[i].size() != 3)
            {
               ROS_WARN("Ignoring sgp_config entry: Not a point consisting of three real values");
               continue;
            }

            if( sgp_config_param_value[i][0].getType() !=  XmlRpcValue::TypeDouble ||
                sgp_config_param_value[i][1].getType() !=  XmlRpcValue::TypeDouble ||
                sgp_config_param_value[i][2].getType() !=  XmlRpcValue::TypeDouble)
            {
              ROS_WARN("Ignoring sgp_config entry: Not a point consisting of three real values");
              continue;
            }
            hand_points[counting_hand_points].x = sgp_config_param_value[i][0];
            hand_points[counting_hand_points].y = sgp_config_param_value[i][1];
            hand_points[counting_hand_points].z = sgp_config_param_value[i][2];
            printf("Added point %d with %f %f %f\n", counting_hand_points, hand_points[counting_hand_points].x,
                        hand_points[counting_hand_points].y, hand_points[counting_hand_points].z);
            counting_hand_points++;
        }
      }
  }
  else
    printf("sgp config not set!!\n\n");
  if(n.hasParam( "sgp_config_param_start_top"))
  {
    XmlRpcValue sgp_config_param_value;
    n.getParam( "sgp_config_param_start_top", sgp_config_param_value );

    if(sgp_config_param_value.getType() !=  XmlRpcValue::TypeDouble)
       ROS_WARN("Ignoring sgp_config_paramt_start_top: Not a real value");
    else
    {
      param_start_top = sgp_config_param_value;
    }
  }
  if(n.hasParam( "sgp_config_param_start_side"))
  {
    XmlRpcValue sgp_config_param_value;
    n.getParam( "sgp_config_param_start_side", sgp_config_param_value );
    if(sgp_config_param_value.getType() !=  XmlRpcValue::TypeDouble)
       ROS_WARN("Ignoring sgp_config_param_start_side: Not a real value");
    else
    {
      param_start_side = sgp_config_param_value;
    }
  }
  InitSGP(hand_points, counting_hand_points, 0.0);
}

int main(int argc, char* argv[])
{
  ros::init (argc, argv, "trans_pcd_jlo");
  ros::NodeHandle nh("~");

  ros::Subscriber cloud_sub = nh.subscribe (s_input_cloud_topic, 1, &cloud_cb);
  pub = nh.advertise<geometry_msgs::Pose>(s_output_cloud_topic, 1);
  GetParams(nh);
  while(nh.ok())
  {
    ros::spinOnce ();
  }
  return 0;
}

---

pc_grasp_position
Author(s): Ulrich F Klank
autogenerated on Mon Dec 3 22:07:46 2012