/usr/lib/python2.7/dist-packages/cartopy/mpl/slippy_image_artist.py is in python-cartopy 0.14.2+dfsg1-2build3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | # (C) British Crown Copyright 2014 - 2016, Met Office
#
# This file is part of cartopy.
#
# cartopy is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the
# Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cartopy 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with cartopy. If not, see <https://www.gnu.org/licenses/>.
"""
Defines the SlippyImageArtist class, which interfaces with
:class:`cartopy.io.RasterSource` instances at draw time, for interactive
dragging and zooming of raster data.
"""
from __future__ import (absolute_import, division, print_function)
from matplotlib.image import AxesImage
import matplotlib.artist
class SlippyImageArtist(AxesImage):
"""
A subclass of :class:`~matplotlib.image.AxesImage` which provides an
interface for getting a raster from the given object with interactive
slippy map type functionality.
Kwargs are passed to the AxesImage constructor.
"""
def __init__(self, ax, raster_source, **kwargs):
self.raster_source = raster_source
super(SlippyImageArtist, self).__init__(ax, **kwargs)
self.set_clip_path(ax.outline_patch)
@matplotlib.artist.allow_rasterization
def draw(self, renderer, *args, **kwargs):
if not self.get_visible():
return
ax = self.axes
window_extent = ax.get_window_extent()
[x1, y1], [x2, y2] = ax.viewLim.get_points()
located_images = self.raster_source.fetch_raster(
ax.projection, extent=[x1, x2, y1, y2],
target_resolution=(window_extent.width, window_extent.height))
for img, extent in located_images:
self.set_array(img)
with ax.hold_limits():
self.set_extent(extent)
super(SlippyImageArtist, self).draw(renderer, *args, **kwargs)
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