geom_dotplot.py 文件源码

def draw_group(data, panel_params, coord, ax, **params):
        data = coord.transform(data, panel_params)
        fill = to_rgba(data['fill'], data['alpha'])
        color = to_rgba(data['color'], data['alpha'])
        ranges = coord.range(panel_params)

        # For perfect circles the width/height of the circle(ellipse)
        # should factor in the dimensions of axes
        bbox = ax.get_window_extent().transformed(
            ax.figure.dpi_scale_trans.inverted())
        ax_width, ax_height = bbox.width, bbox.height

        factor = ((ax_width/ax_height) *
                  np.ptp(ranges.y)/np.ptp(ranges.x))
        size = data.loc[0, 'binwidth'] * params['dotsize']
        offsets = data['stackpos'] * params['stackratio']

        if params['binaxis'] == 'x':
            width, height = size, size*factor
            xpos, ypos = data['x'], data['y'] + height*offsets
        elif params['binaxis'] == 'y':
            width, height = size/factor, size
            xpos, ypos = data['x'] + width*offsets, data['y']

        circles = []
        for xy in zip(xpos, ypos):
            patch = mpatches.Ellipse(xy, width=width, height=height)
            circles.append(patch)

        coll = mcoll.PatchCollection(circles,
                                     edgecolors=color,
                                     facecolors=fill)
        ax.add_collection(coll)