matplotlib example logo (snippet)

Python matplotlib example 'logo'

Functions in program:

def main(ax):

Modules used in program:

import numpy as np
import matplotlib.patches
import matplotlib.textpath
import cartopy.crs as ccrs

python logo

Python matplotlib example: logo

import cartopy.crs as ccrs
import matplotlib.textpath
import matplotlib.patches
from matplotlib.font_manager import FontProperties
import numpy as np


def main(ax):
    # Comes from the cartopy gallery: http://scitools.org.uk/cartopy/docs/latest/examples/logo.html

    # generate a matplotlib path representing the word "cartopy"
    fp = FontProperties(family='Bitstream Vera Sans', weight='bold')
    logo_path = matplotlib.textpath.TextPath((-175, -35), 'cartopy',
                                             size=80, prop=fp)
    # scale the letters up to sensible longitude and latitude sizes
    logo_path._vertices *= np.array([1, 2])

    im = ax.stock_img()

    def on_draw(event=None):
        """
        Hooks into matplotlib's event mechanism to define the clip path of the
        background image.

        """
        plate_carree_transform = ccrs.PlateCarree()._as_mpl_transform(ax)
        im.set_clip_path(logo_path, transform=plate_carree_transform)

    # Register the on_draw method and call it once now.
    ax.figure.canvas.mpl_connect('draw_event', on_draw)
    on_draw()

    # add the path as a patch, drawing black outlines around the text
    patch = matplotlib.patches.PathPatch(logo_path,
                                         antialiased=True,
                                         facecolor='none', edgecolor='black',
                                         transform=ccrs.PlateCarree())
    ax.add_patch(patch)

Python links

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