Python Bbox.null方法代码示例

# 需要导入模块: from matplotlib.transforms import Bbox [as 别名]
# 或者: from matplotlib.transforms.Bbox import null [as 别名]
def main():
    blue = '#4b92db'

    # We're drawing a flag with a 3:5 aspect ratio.
    fig = plt.figure(figsize=[10, 6], facecolor=blue)
    # Put a blue background on the figure.
    blue_background = PathPatch(matplotlib.path.Path.unit_rectangle(),
                                transform=fig.transFigure, color=blue,
                                zorder=-1)
    fig.patches.append(blue_background)

    # Set up the Azimuthal Equidistant and Plate Carree projections
    # for later use.
    az_eq = ccrs.AzimuthalEquidistant(central_latitude=90)
    pc = ccrs.PlateCarree()

    # Pick a suitable location for the map (which is in an Azimuthal
    # Equidistant projection).
    ax = plt.axes([0.25, 0.24, 0.5, 0.54], projection=az_eq)

    # The background patch and outline patch are not needed in this example.
    ax.background_patch.set_facecolor('none')
    ax.outline_patch.set_edgecolor('none')

    # We want the map to go down to -60 degrees latitude.
    ax.set_extent([-180, 180, -60, 90], ccrs.PlateCarree())

    # Importantly, we want the axes to be circular at the -60 latitude
    # rather than cartopy's default behaviour of zooming in and becoming
    # square.
    _, patch_radius = az_eq.transform_point(0, -60, pc)
    circular_path = matplotlib.path.Path.circle(0, patch_radius)
    ax.set_boundary(circular_path)

    if filled_land:
        ax.add_feature(
            cartopy.feature.LAND, facecolor='white', edgecolor='none')
    else:
        ax.stock_img()

    gl = ax.gridlines(crs=pc, linewidth=3, color='white', linestyle='-')
    # Meridians every 45 degrees, and 5 parallels.
    gl.xlocator = matplotlib.ticker.FixedLocator(np.arange(0, 361, 45))
    parallels = np.linspace(-60, 70, 5, endpoint=True)
    gl.ylocator = matplotlib.ticker.FixedLocator(parallels)

    # Now add the olive branches around the axes. We do this in normalised
    # figure coordinates
    olive_leaf = olive_path()

    olives_bbox = Bbox.null()
    olives_bbox.update_from_path(olive_leaf)

    # The first olive branch goes from left to right.
    olive1_axes_bbox = Bbox([[0.45, 0.15], [0.725, 0.75]])
    olive1_trans = BboxTransform(olives_bbox, olive1_axes_bbox)

    # THe second olive branch goes from right to left (mirroring the first).
    olive2_axes_bbox = Bbox([[0.55, 0.15], [0.275, 0.75]])
    olive2_trans = BboxTransform(olives_bbox, olive2_axes_bbox)

    olive1 = PathPatch(olive_leaf, facecolor='white', edgecolor='none',
                       transform=olive1_trans + fig.transFigure)
    olive2 = PathPatch(olive_leaf, facecolor='white', edgecolor='none',
                       transform=olive2_trans + fig.transFigure)

    fig.patches.append(olive1)
    fig.patches.append(olive2)

    plt.show()