使用几何对象作为matplotlib路径和面片
descartes的Python项目详细描述
使用Shapely或类似geojson的几何对象作为matplotlib路径和补丁
需要:matplotlib、numpy和可选的shapely 1.2+。
示例:
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()
另请参见:examples/patches.py。
笛卡尔与同名的显然已不复存在的 项目位于http://descartes.sourceforge.net/。