def barh(self, bottom, width, height=0.8, left=None, **kwargs):
        """
        Make a horizontal bar plot.
        ...
        orientation : 'vertical' | 'horizontal', optional, default: 'vertical'
            The orientation of the bars.
        ...
        """

        patches = self.bar(left=left, height=height, width=width,
                           bottom=bottom, orientation='horizontal', **kwargs)
        return patches