Use geometric objects as matplotlib paths and patches
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)
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)
polygon = eroded.geo_interface
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