tf当前用到的接口小结

1、定义一个tf发布器

tf::TransformBroadcaster br;

2、定义个tf的转换关系

tf::Transform transform;

设置三维坐标点的位置

transform.setOrigin( tf::Vector3(msg->x, msg->y, 0.0) );

将角度转换成四元数，设置到转换中

tf::Quaternion q;

q.setRPY(0, 0, msg->theta);

transform.setRotation(q);

3、将转换关系即相对父坐标系的位置发送到tf库

br.sendTransform(tf::StampedTransform(transform, ros::Time::now(), "world", turtle_name));

4、定义一个接收器

tf::TransformListener listener;

5、定义个Stamped tf的转换关系

tf::StampedTransform transform;

6、等待需要的tf转换关系生成

listener.waitForTransform("/turtle2", "/turtle1", now, ros::Duration(3.0));

7、查阅turtle2转换成turtle1的

 listener.lookupTransform("/turtle2", "/turtle1",now, transform);

8、注册接收某个坐标系

tf_filter_ = new tf::MessageFilter<geometry_msgs::PointStamped>(point_sub_, tf_, target_frame_, 10);

    tf_filter_->registerCallback( boost::bind(&PoseDrawer::msgCallback, this, _1) );

9、转换point_ptr到target_frame_的转换关系

tf_.transformPoint(target_frame_, *point_ptr, point_out);

10、将yaw角度值转换成四元素

tf::createQuaternionMsgFromYaw(angle+M_PI/2);

tf::Quaternion createIdentityQuaternion()

• Return an identity quaternion.

tf::Quaternion createQuaternionFromRPY(double roll,double pitch,double yaw)

• Return a tf::Quaternion constructed from Fixed-Axis Roll, Pitch and Yaw

geometry_msgs::Quaternion createQuaternionMsgFromRollPitchYaw(double roll,double pitch,double yaw)

• Return a geometry_msgs::Quaternion constructed from Fixed-Axis Roll, Pitch and Yaw.

11、

Quaternion	tf::Quaternion
Vector	tf::Vector3
Point	tf::Point
Pose	tf::Pose
Transform	tf::Transform

12、抛出异常

Exceptions used in the tf package

All exceptions in tf inherit from tf::TransformException, which inherits from std::runtime_error.

tf::ConnectivityException

• Thrown if the request cannot be completed due to the two frame ids not being in the same connected tree.

tf::ExtrapolationException

• Thrown if there is a connection between the frame ids requested but one or more of the transforms are out of date.

tf::InvalidArgument

• Thrown if an argument is invalid. The most common case is an unnormalized quaternion.

tf::LookupException

• Thrown if an unpublished frame id is referenced.