geom_crossbar.py 文件源码

def draw_legend(data, da, lyr):
        """
        Draw a rectangle with a horizontal strike in the box

        Parameters
        ----------
        data : dataframe
        da : DrawingArea
        lyr : layer

        Returns
        -------
        out : DrawingArea
        """
        data['size'] *= SIZE_FACTOR

        # background
        facecolor = to_rgba(data['fill'], data['alpha'])
        if facecolor is None:
            facecolor = 'none'

        bg = Rectangle((da.width*.125, da.height*.25),
                       width=da.width*.75,
                       height=da.height*.5,
                       linewidth=data['size'],
                       facecolor=facecolor,
                       edgecolor=data['color'],
                       linestyle=data['linetype'],
                       capstyle='projecting',
                       antialiased=False)
        da.add_artist(bg)

        strike = mlines.Line2D([da.width*.125, da.width*.875],
                               [da.height*.5, da.height*.5],
                               linestyle=data['linetype'],
                               linewidth=data['size'],
                               color=data['color'])
        da.add_artist(strike)
        return da