def set_data(self, data, metadata=None):
        """Set an image to be displayed by providing raw data.

        This is a convenience method for first constructing an image
        with `~ginga.AstroImage.AstroImage` and then calling :meth:`set_image`.

        Parameters
        ----------
        data : ndarray
            This should be at least a 2D Numpy array.

        metadata : dict or `None`
            Image metadata mapping keywords to their respective values.

        """
        image = AstroImage.AstroImage(data, metadata=metadata,
                                      logger=self.logger)
        self.set_image(image)
Set an image to be displayed by providing raw data.

        This is a convenience method for first constructing an image
        with `~ginga.AstroImage.AstroImage` and then calling :meth:`set_image`.

        Parameters
        ----------
        data : ndarray
            This should be at least a 2D Numpy array.

        metadata : dict or `None`
            Image metadata mapping keywords to their respective values.