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boundary.py
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boundary.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2014-2021 Pyresample developers
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""The Boundary classes."""
import logging
import numpy as np
from pyresample.spherical import SphPolygon
logger = logging.getLogger(__name__)
class Boundary(object):
"""Boundary objects."""
def __init__(self, lons=None, lats=None, frequency=1):
self._contour_poly = None
if lons is not None:
self.lons = lons[::frequency]
if lats is not None:
self.lats = lats[::frequency]
def contour(self):
"""Get lon/lats of the contour."""
return self.lons, self.lats
@property
def contour_poly(self):
"""Get the Spherical polygon corresponding to the Boundary."""
if self._contour_poly is None:
self._contour_poly = SphPolygon(
np.deg2rad(np.vstack(self.contour()).T))
return self._contour_poly
def draw(self, mapper, options, **more_options):
"""Draw the current boundary on the *mapper*."""
self.contour_poly.draw(mapper, options, **more_options)
class AreaBoundary(Boundary):
"""Area boundary objects."""
def __init__(self, *sides):
Boundary.__init__(self)
self.sides_lons, self.sides_lats = zip(*sides)
self.sides_lons = list(self.sides_lons)
self.sides_lats = list(self.sides_lats)
def decimate(self, ratio):
"""Remove some points in the boundaries, but never the corners."""
for i in range(len(self.sides_lons)):
length = len(self.sides_lons[i])
start = int((length % ratio) / 2)
points = np.concatenate(([0], np.arange(start, length, ratio),
[length - 1]))
if points[1] == 0:
points = points[1:]
if points[-2] == (length - 1):
points = points[:-1]
self.sides_lons[i] = self.sides_lons[i][points]
self.sides_lats[i] = self.sides_lats[i][points]
def contour(self):
"""Get the (lons, lats) tuple of the boundary object."""
lons = np.concatenate([lns[:-1] for lns in self.sides_lons])
lats = np.concatenate([lts[:-1] for lts in self.sides_lats])
return lons, lats
class AreaDefBoundary(AreaBoundary):
"""Boundaries for area definitions (pyresample)."""
def __init__(self, area, frequency=1):
lons, lats = area.get_bbox_lonlats()
AreaBoundary.__init__(self,
*zip(lons, lats))
if frequency != 1:
self.decimate(frequency)
class SimpleBoundary(object):
"""Container for geometry boundary.
Labelling starts in upper left corner and proceeds clockwise
"""
def __init__(self, side1, side2, side3, side4):
self.side1 = side1
self.side2 = side2
self.side3 = side3
self.side4 = side4