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# Copyright Crown and Cartopy Contributors
#
# This file is part of Cartopy and is released under the BSD 3-clause license.
# See LICENSE in the root of the repository for full licensing details.
import inspect
from pathlib import Path
import textwrap
import matplotlib.pyplot as plt
import numpy as np
import cartopy.crs as ccrs
#: A dictionary to allow examples to use non-default parameters to the CRS
#: constructor.
SPECIFIC_PROJECTION_KWARGS = {
ccrs.RotatedPole: {'pole_longitude': 177.5, 'pole_latitude': 37.5},
ccrs.AzimuthalEquidistant: {'central_latitude': 90},
ccrs.NearsidePerspective: {
'central_longitude': -3.53, 'central_latitude': 50.72,
'satellite_height': 10.0e6},
ccrs.OSGB: {'approx': False},
ccrs.OSNI: {'approx': False},
ccrs.TransverseMercator: {'approx': False},
}
def plate_carree_plot():
nplots = 2
fig = plt.figure(figsize=(6, 6))
for i in range(0, nplots):
central_longitude = 0 if i == 0 else 180
ax = fig.add_subplot(
nplots, 1, i+1,
projection=ccrs.PlateCarree(central_longitude=central_longitude))
ax.coastlines(resolution='110m')
ax.gridlines()
def igh_plot():
fig = plt.figure(figsize=(6.9228, 6))
ax1 = fig.add_subplot(2, 1, 1,
projection=ccrs.InterruptedGoodeHomolosine(
emphasis='land'))
ax1.coastlines(resolution='110m')
ax1.gridlines()
ax2 = fig.add_subplot(2, 1, 2,
projection=ccrs.InterruptedGoodeHomolosine(
central_longitude=-160, emphasis='ocean'))
ax2.coastlines(resolution='110m')
ax2.gridlines()
def utm_plot():
nplots = 60
fig = plt.figure(figsize=(10, 3))
for i in range(0, nplots):
ax = fig.add_subplot(1, nplots, i+1,
projection=ccrs.UTM(zone=i+1,
southern_hemisphere=True))
ax.coastlines(resolution='110m')
ax.gridlines()
MULTI_PLOT_CASES = {
ccrs.PlateCarree: plate_carree_plot,
ccrs.InterruptedGoodeHomolosine: igh_plot,
ccrs.UTM: utm_plot,
}
COASTLINE_RESOLUTION = {ccrs.OSNI: '10m',
ccrs.OSGB: '50m',
ccrs.EuroPP: '50m',
ccrs.LambertZoneII: '10m'}
PRJ_SORT_ORDER = {'PlateCarree': 1,
'Mercator': 2, 'Mollweide': 2, 'Robinson': 2,
'TransverseMercator': 2, 'ObliqueMercator': 2,
'LambertCylindrical': 2,
'LambertConformal': 2, 'EquidistantConic': 2,
'Stereographic': 2, 'Miller': 2,
'Orthographic': 2, 'UTM': 2, 'AlbersEqualArea': 2,
'AzimuthalEquidistant': 2, 'Sinusoidal': 2,
'InterruptedGoodeHomolosine': 3, 'RotatedPole': 3,
'OSGB': 4, 'LambertZoneII': 4.1, 'EuroPP': 5,
'Geostationary': 6, 'NearsidePerspective': 7,
'EckertI': 8.1, 'EckertII': 8.2, 'EckertIII': 8.3,
'EckertIV': 8.4, 'EckertV': 8.5, 'EckertVI': 8.6,
'Spilhaus': 9}
def find_projections():
for obj_name, o in vars(ccrs).copy().items():
if isinstance(o, type) and issubclass(o, ccrs.Projection) and \
not obj_name.startswith('_') and obj_name not in ['Projection']:
yield o
def create_instance(prj_cls, instance_args):
name = prj_cls.__name__
# Format instance arguments into strings
instance_params = ',\n '.join(
f'{k}={v}'
for k, v in sorted(instance_args.items()))
if instance_params:
instance_params = '\n ' \
+ instance_params
instance_creation_code = f'{name}({instance_params})'
prj_inst = prj(**instance_args)
return prj_inst, instance_creation_code
if __name__ == '__main__':
fname = Path(__file__).parent / 'source' / 'reference' / 'projections.rst'
table = open(fname, 'w')
header = """
.. (comment): DO NOT EDIT this file.
.. It is auto-generated by running : cartopy/docs/make_projection.py
.. Please adjust by making changes there.
.. It is included in the repository only to aid detection of changes.
.. _cartopy_projections:
Cartopy projection list
=======================
"""
table.write(textwrap.dedent(header))
def prj_class_sorter(cls):
return (PRJ_SORT_ORDER.get(cls.__name__, 100),
cls.__name__)
for prj in sorted(find_projections(), key=prj_class_sorter):
name = prj.__name__
table.write(name + '\n')
table.write('-' * len(name) + '\n\n')
table.write('.. autoclass:: cartopy.crs.%s\n' % name)
if prj not in MULTI_PLOT_CASES:
# Get instance arguments and number of plots
instance_args = SPECIFIC_PROJECTION_KWARGS.get(prj, {})
prj_inst, instance_repr = create_instance(prj, instance_args)
aspect = (np.diff(prj_inst.x_limits) /
np.diff(prj_inst.y_limits))[0]
width = 3 * aspect
width = f'{width:.4f}'.rstrip('0').rstrip('.')
# Generate plotting code
code = textwrap.dedent("""
.. plot::
import matplotlib.pyplot as plt
import cartopy.crs as ccrs
plt.figure(figsize=({width}, 3))
ax = plt.axes(projection=ccrs.{proj_constructor})
ax.coastlines(resolution={coastline_resolution!r})
ax.gridlines()
""").format(width=width,
proj_constructor=instance_repr,
coastline_resolution=COASTLINE_RESOLUTION.get(prj,
'110m'))
else:
func = MULTI_PLOT_CASES[prj]
lines = inspect.getsourcelines(func)
func_code = "".join(lines[0][1:])
code = textwrap.dedent("""
.. plot::
import matplotlib.pyplot as plt
import cartopy.crs as ccrs
{func_code}
""").format(func_code=func_code)
table.write(code)
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