40 lines
1.3 KiB
Python
Executable File
40 lines
1.3 KiB
Python
Executable File
#!/usr/bin/env python
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import rospy
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import tf
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import time
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from geometry_msgs.msg import (PoseStamped, Pose, Point, Quaternion)
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from math import radians
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def tf_lookup(object_name):
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do_try = True
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listener = tf.TransformListener()
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while not rospy.is_shutdown() and do_try:
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try:
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(trans,rot) = listener.lookupTransform('base', object_name, rospy.Time(0))
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do_try = False
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except (tf.LookupException, tf.ConnectivityException, tf.ExtrapolationException):
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print('Failed to get frame data, retrying...')
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time.sleep(0.1)
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continue
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object_angles = tf.transformations.euler_from_quaternion([rot[0] , rot[1] , rot[2], rot[3]])
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xangle = object_angles[0] + radians(0)
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xangle1 = object_angles[1] + radians(0)
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xangle2 = object_angles[2] + radians(180)
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object_angles = (xangle, xangle1, xangle2)
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target_quat = tf.transformations.quaternion_from_euler(object_angles[0], object_angles[1], object_angles[2])
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target_pose = Pose()
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target_pose.position.x = trans[0]
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target_pose.position.y = trans[1]
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target_pose.position.z = trans[2]
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target_pose.orientation.x = target_quat[0]
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target_pose.orientation.y = target_quat[1]
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target_pose.orientation.z = target_quat[2]
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target_pose.orientation.w = target_quat[3]
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return target_pose
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if __name__ == "__main__":
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rospy.init_node('example_tf_listener')
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print(tf_lookup('c1')) |