display.py

# Typical header of a Python script using Pinocchio
import gepetto.corbaserver
import pinocchio as pin
 
 
# Example of a class Display that connect to Gepetto-viewer and implement a
# 'place' method to set the position/rotation of a 3D visual object in a scene.
class Display:
    """
    Class Display: Example of a class implementing a client for the Gepetto-viewer
    server. The main method of the class is 'place', that sets the position/rotation of
    a 3D visual object in a scene.
    """
 
    def __init__(self, windowName="pinocchio"):
        """
        This function connect with the Gepetto-viewer server and open a window with the
        given name.  If the window already exists, it is kept in the current state.
        Otherwise, the newly-created window is set up with a scene named 'world'.
        """
 
        # Create the client and connect it with the display server.
        try:
            self.viewer = gepetto.corbaserver.Client()
        except:  # noqa: E722
            print("Error while starting the viewer client. ")
            print("Check whether Gepetto-viewer is properly started")
 
        # Open a window for displaying your model.
        try:
            # If the window already exists, do not do anything.
            windowID = self.viewer.gui.getWindowID(windowName)
            print("Warning: window '" + windowName + "' already created.")
            print(
                "The previously created objects will not be destroyed "
                "and do not have to be created again."
            )
        except:  # noqa: E722
            # Otherwise, create the empty window.
            windowID = self.viewer.gui.createWindow(windowName)
            # Start a new "scene" in this window, named "world", with just a floor.
            self.viewer.gui.createScene("world")
            self.viewer.gui.addSceneToWindow("world", windowID)
 
        # Finally, refresh the layout to obtain your first rendering.
        self.viewer.gui.refresh()
 
    def place(self, objName, M, refresh=True):
        """
        This function places (ie changes both translation and rotation) of the object
        names "objName" in place given by the SE3 object "M". By default, immediately
        refresh the layout. If multiple objects have to be placed at the same time, do
        the refresh only at the end of the list.
        """
        self.viewer.gui.applyConfiguration(objName, pin.se3ToXYZQUATtuple(M))
        if refresh:
            self.viewer.gui.refresh()