geom_polygon.py 文件源码

def draw_group(data, panel_params, coord, ax, **params):
        data = coord.transform(data, panel_params, munch=True)
        data['size'] *= SIZE_FACTOR

        # Each group is a polygon with a single facecolor
        # with potentially an edgecolor for every edge.
        ngroups = data['group'].unique().size
        verts = [None] * ngroups
        facecolor = [None] * ngroups
        edgecolor = [None] * ngroups
        linestyle = [None] * ngroups
        linewidth = [None] * ngroups

        # Some stats may order the data in ways that prevent
        # objects from occluding other objects. We do not want
        # to undo that order.
        grouper = data.groupby('group', sort=False)
        for i, (group, df) in enumerate(grouper):
            verts[i] = tuple(zip(df['x'], df['y']))
            fill = to_rgba(df['fill'].iloc[0], df['alpha'].iloc[0])
            facecolor[i] = 'none' if fill is None else fill
            edgecolor[i] = df['color'].iloc[0] or 'none'
            linestyle[i] = df['linetype'].iloc[0]
            linewidth[i] = df['size'].iloc[0]

        col = PolyCollection(
            verts,
            facecolors=facecolor,
            edgecolors=edgecolor,
            linestyles=linestyle,
            linewidths=linewidth,
            transOffset=ax.transData,
            zorder=params['zorder'])

        ax.add_collection(col)