add example using ROS control with Bullet and Gazebo

examples/middlewares/bullet_ros_control_gazebo.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python
+"""Test the publisher using Gazebo with ROS control and Pybullet
+
+Before running this file, read the following instructions!
+
+First, clone the following repository in your catkin workspace (catkin_ws/src/):
+$ git clone https://github.com/ros-simulation/gazebo_ros_demos
+
+Then, in your workspace compile it using `catkin_make` and source it:
+$ catkin_make
+$ source devel/setup.bash
+
+Launch the roslaunch gazebo file and control file:
+$ roslaunch rrbot_gazebo rrbot_world.launch   # this will launch Gazebo and start the controller manager
+$ roslaunch rrbot_control rrbot_control.launch   # this will load the controllers
+
+Now, you should have your Gazebo running with the `rrbot` inside. Then, just run this file:
+$ python bullet_ros_control_gazebo.py
+
+And move the `rrbot` robot using your mouse by left-clicking on a part of the robot and moving it.
+
+Here is a video of what it should give: https://www.youtube.com/watch?v=NOybmaRHaBM
+"""
+
+import pyrobolearn as prl
+
+ros = prl.middlewares.ROS(publish=True, teleoperate=True)
+sim = prl.simulators.Bullet(middleware=ros)
+
+# load world
+world = prl.worlds.BasicWorld(sim)
+
+# load robot
+robot = world.load_robot('rrbot')
+
+# run simulation
+for t in prl.count():
+    # get the joint positions from the Bullet simulator (because :attr:`teleoperate` has been set to True,
+    # it will publish these read positions on the corresponding topic)
+    q = robot.get_joint_positions()
+
+    # perform a step in the simulator (and sleep for `sim.dt`)
+    world.step(sim.dt)