我正在尝试使用 matplotlib 和pyshp查看从 Shapefile 读取的基本多边形 但我所有的努力只产生了一个没有多边形的空轴。以下是我的一些尝试,使用显示比利时边界的数据集:
import shapefile as sf
r = sf.Reader("BEL_adm/BEL_adm0")
p=r.shapes()
b=p[0]
points = b.points
import matplotlib.pyplot as plt
from matplotlib.path import Path
imporst matplotlib.patches as patches
verts = points
verts = []
for x,y in points:
verts.append(tuple([x,y]))
codes = ['']*len(verts)
codes[0] = Path.MOVETO
codes[-1] = Path.CLOSEPOLY
for i in range(1,len(verts)):
codes[i]=Path.LINETO
path = Path(verts, codes)
fig = plt.figure()
ax = fig.add_subplot(111)
patch = patches.PathPatch(path, facecolor='orange', lw=2)
ax.add_patch(patch)
ax.set_xlim(-2,2)
ax.set_ylim(-2,2)
plt.show()
另一个使用补丁的尝试也会产生一个空帧:
fig = plt.figure(figsize=(11.7,8.3))
ax = plt.subplot(111)
x,y=zip(*b.points)
import matplotlib.patches as patches
import matplotlib.pyplot as plt
bol=patches.Polygon(b.points,True, transform=ax.transAxes)
ax.add_patch(bol)
ax.set_ylim(0,60)
ax.set_xlim(0,200)
plt.show()
很高兴看到我错过了什么。
谢谢,奥兹