//! Sends the command to start a given trajectory
void startTrajectory(control_msgs::FollowJointTrajectoryGoal goal)
{
// When to start the trajectory: 1s from now
goal.trajectory.header.stamp = ros::Time::now() + ros::Duration(1.0);
traj_client_->sendGoal(goal);
if (!traj_client_->waitForResult(ros::Duration(10.0)))
{
traj_client_->cancelGoal();
ROS_INFO("Action did not finish before the time out.\n");
}
}
//send a desired joint trajectory to the joint trajectory action
//and wait for it to finish
bool execute_joint_trajectory(std::vector<double *> joint_trajectory)
{
int i, j;
int trajectorylength = joint_trajectory.size();
//get the current joint angles
double current_angles[6];
get_current_joint_angles(current_angles);
//fill the goal message with the desired joint trajectory
goal.trajectory.points.resize(trajectorylength+1);
//set the first trajectory point to the current position
goal.trajectory.points[0].positions.resize(6);
goal.trajectory.points[0].velocities.resize(6);
for(j=0; j<6; j++)
{
goal.trajectory.points[0].positions[j] = current_angles[j];
goal.trajectory.points[0].velocities[j] = 0.0;
}
//make the first trajectory point start 0.25 seconds from when we run
goal.trajectory.points[0].time_from_start = ros::Duration(0.25);
//fill in the rest of the trajectory
double time_from_start = 0.25;
for(i=0; i<trajectorylength; i++)
{
goal.trajectory.points[i+1].positions.resize(6);
goal.trajectory.points[i+1].velocities.resize(6);
//fill in the joint positions (velocities of 0 mean that the arm
//will try to stop briefly at each waypoint)
for(j=0; j<6; j++)
{
goal.trajectory.points[i+1].positions[j] = joint_trajectory[i][j];
goal.trajectory.points[i+1].velocities[j] = 0.0;
}
//compute a desired time for this trajectory point using a max
//joint velocity
double max_joint_move = 0;
for(j=0; j<6; j++)
{
double joint_move = fabs(goal.trajectory.points[i+1].positions[j]
- goal.trajectory.points[i].positions[j]);
if(joint_move > max_joint_move) max_joint_move = joint_move;
}
double seconds = max_joint_move/MAX_JOINT_VEL;
ROS_INFO("max_joint_move: %0.3f, seconds: %0.3f", max_joint_move, seconds);
time_from_start += seconds;
goal.trajectory.points[i+1].time_from_start =
ros::Duration(time_from_start);
}
//when to start the trajectory
goal.trajectory.header.stamp = ros::Time::now() + ros::Duration(0.25);
ROS_INFO("Sending goal to joint_trajectory_action");
action_client->sendGoal(goal);
action_client->waitForResult();
//get the current joint angles for debugging
get_current_joint_angles(current_angles);
// ROS_INFO("joint angles after trajectory: %0.3f %0.3f %0.3f %0.3f %0.3f %0.3f %0.3f\n",current_angles[0],current_angles[1],current_angles[2],current_angles[3],current_angles[4],current_angles[5]);
if(action_client->getState() == actionlib::SimpleClientGoalState::SUCCEEDED){
ROS_INFO("Hooray, the arm finished the trajectory!");
return 1;
}
ROS_INFO("The arm failed to execute the trajectory.");
return 0;
}
