Descartes
=========
Use Shapely_ or GeoJSON-like geometric objects as matplotlib paths and patches
.. image:: http://farm4.static.flickr.com/3662/4555372019_9bbed1f956_o_d.png
:width: 800
:height: 320
Requires: matplotlib, numpy, and optionally Shapely 1.2+.
Example::
from matplotlib import pyplot
from shapely.geometry import LineString
from descartes import PolygonPatch
BLUE = '#6699cc'
GRAY = '#999999'
def plot_line(ax, ob):
x, y = ob.xy
ax.plot(x, y, color=GRAY, linewidth=3, solid_capstyle='round', zorder=1)
line = LineString([(0, 0), (1, 1), (0, 2), (2, 2), (3, 1), (1, 0)])
fig = pyplot.figure(1, figsize=(10, 4), dpi=180)
# 1
ax = fig.add_subplot(121)
plot_line(ax, line)
dilated = line.buffer(0.5)
patch1 = PolygonPatch(dilated, fc=BLUE, ec=BLUE, alpha=0.5, zorder=2)
ax.add_patch(patch1)
#2
ax = fig.add_subplot(122)
patch2a = PolygonPatch(dilated, fc=GRAY, ec=GRAY, alpha=0.5, zorder=1)
ax.add_patch(patch2a)
eroded = dilated.buffer(-0.3)
# GeoJSON-like data works as well
polygon = eroded.__geo_interface__
# >>> geo['type']
# 'Polygon'
# >>> geo['coordinates'][0][:2]
# ((0.50502525316941682, 0.78786796564403572), (0.5247963548222736, 0.8096820147509064))
patch2b = PolygonPatch(polygon, fc=BLUE, ec=BLUE, alpha=0.5, zorder=2)
ax.add_patch(patch2b)
pyplot.show()
See also: examples/patches.py.
Descartes is not associated with the identically named and apparently defunct
project at http://descartes.sourceforge.net/.
.. _Shapely: http://gispython.org/lab/wiki/Shapely
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"description": "Descartes\n=========\n\nUse Shapely_ or GeoJSON-like geometric objects as matplotlib paths and patches\n\n.. image:: http://farm4.static.flickr.com/3662/4555372019_9bbed1f956_o_d.png\n :width: 800\n :height: 320\n\nRequires: matplotlib, numpy, and optionally Shapely 1.2+.\n\nExample::\n\n from matplotlib import pyplot\n from shapely.geometry import LineString\n from descartes import PolygonPatch\n\n BLUE = '#6699cc'\n GRAY = '#999999'\n\n def plot_line(ax, ob):\n x, y = ob.xy\n ax.plot(x, y, color=GRAY, linewidth=3, solid_capstyle='round', zorder=1)\n\n line = LineString([(0, 0), (1, 1), (0, 2), (2, 2), (3, 1), (1, 0)])\n\n fig = pyplot.figure(1, figsize=(10, 4), dpi=180)\n\n # 1\n ax = fig.add_subplot(121)\n\n plot_line(ax, line)\n\n dilated = line.buffer(0.5)\n patch1 = PolygonPatch(dilated, fc=BLUE, ec=BLUE, alpha=0.5, zorder=2)\n ax.add_patch(patch1)\n\n #2\n ax = fig.add_subplot(122)\n\n patch2a = PolygonPatch(dilated, fc=GRAY, ec=GRAY, alpha=0.5, zorder=1)\n ax.add_patch(patch2a)\n\n eroded = dilated.buffer(-0.3)\n\n # GeoJSON-like data works as well\n\n polygon = eroded.__geo_interface__\n # >>> geo['type']\n # 'Polygon'\n # >>> geo['coordinates'][0][:2]\n # ((0.50502525316941682, 0.78786796564403572), (0.5247963548222736, 0.8096820147509064))\n patch2b = PolygonPatch(polygon, fc=BLUE, ec=BLUE, alpha=0.5, zorder=2)\n ax.add_patch(patch2b)\n\n pyplot.show()\n\n\nSee also: examples/patches.py.\n\nDescartes is not associated with the identically named and apparently defunct\nproject at http://descartes.sourceforge.net/.\n\n.. _Shapely: http://gispython.org/lab/wiki/Shapely\n\n\n\n",
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