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"""
Modifying the boundary/neatline of a map in cartopy
---------------------------------------------------
This example demonstrates how to modify the boundary/neatline
of an axes. We construct a star with coordinates in a Plate Carree
coordinate system, and use the star as the outline of the map.
Notice how changing the projection of the map represents a *projected*
star shaped boundary.
"""
import matplotlib.path as mpath
import matplotlib.pyplot as plt
import cartopy.crs as ccrs
def main():
fig = plt.figure()
ax = fig.add_axes([0, 0, 1, 1], projection=ccrs.PlateCarree())
ax.coastlines()
# Construct a star in longitudes and latitudes.
star_path = mpath.Path.unit_regular_star(5, 0.5)
star_path = mpath.Path(star_path.vertices.copy() * 80,
star_path.codes.copy())
# Use the star as the boundary.
ax.set_boundary(star_path, transform=ccrs.PlateCarree())
plt.show()
if __name__ == '__main__':
main()
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