tf2_kdl.py

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# Copyright (c) 2008, Willow Garage, Inc.
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# author: Wim Meeussen

import roslib; roslib.load_manifest('tf2_kdl')
import PyKDL
import rospy
import tf2_ros
from geometry_msgs.msg import PointStamped

def transform_to_kdl(t):
    return PyKDL.Frame(PyKDL.Rotation.Quaternion(t.transform.rotation.x, t.transform.rotation.y,
                                                 t.transform.rotation.z, t.transform.rotation.w),
                       PyKDL.Vector(t.transform.translation.x, 
                                    t.transform.translation.y, 
                                    t.transform.translation.z))


# Vector
def do_transform_vector(vector, transform):
    res = transform_to_kdl(transform) * vector
    res.header = transform.header
    return res

tf2_ros.TransformRegistration().add(PyKDL.Vector, do_transform_vector)

def to_msg_vector(vector):
    msg = PointStamped()
    msg.header = vector.header
    msg.point.x = vector[0]
    msg.point.y = vector[1]
    msg.point.z = vector[2]
    return msg

tf2_ros.ConvertRegistration().add_to_msg(PyKDL.Vector, to_msg_vector)

def from_msg_vector(msg):
    vector = PyKDL.Vector(msg.point.x, msg.point.y, msg.point.z)
    return tf2_ros.Stamped(vector, msg.header.stamp, msg.header.frame_id)

tf2_ros.ConvertRegistration().add_from_msg(PyKDL.Vector, from_msg_vector)

def convert_vector(vector):
    return tf2_ros.Stamped(PyKDL.Vector(vector), vector.header.stamp, vector.header.frame_id)

tf2_ros.ConvertRegistration().add_convert((PyKDL.Vector, PyKDL.Vector), convert_vector)

# Frame
def do_transform_frame(frame, transform):
    res = transform_to_kdl(transform) * frame
    res.header = transform.header
    return res
tf2_ros.TransformRegistration().add(PyKDL.Frame, do_transform_frame)

# Twist
def do_transform_twist(twist, transform):
    res = transform_to_kdl(transform) * twist
    res.header = transform.header
    return res
tf2_ros.TransformRegistration().add(PyKDL.Twist, do_transform_twist)


# Wrench
def do_transform_wrench(wrench, transform):
    res = transform_to_kdl(transform) * wrench
    res.header = transform.header
    return res
tf2_ros.TransformRegistration().add(PyKDL.Wrench, do_transform_wrench)