在使用Alphashape和PolygonPatch进行绘图时,必须先对数据进行处理,并确保数据格式正确。以下示例代码可以帮助解决此问题:
from scipy.spatial import Delaunay
from alphashape import alphashape
from descartes import PolygonPatch
import matplotlib.pyplot as plt
# 生成数据点
points = [(0, 0), (0, 1), (1, 1), (1, 0.5), (1.5, 1.5), (2, 2), (3, 3), (3, 4), (4, 3)]
# 建立Delaunay三角网格
tri = Delaunay(points)
# 设置alpha值,生成Alpha Shape
alpha = 0.5
ch = alphashape(points, alpha=alpha)
# 绘制Delaunay三角网格
fig, ax = plt.subplots()
ax.triplot(points[:, 0], points[:, 1], tri.simplices)
ax.plot(points[:,0], points[:,1], 'o')
# 绘制Alpha Shape
patch = PolygonPatch(ch, facecolor='orange', edgecolor='red', alpha=0.7)
ax.add_patch(patch)
plt.show()
该示例代码将生成一个正方形和两个圆形的组合,对其进行Delaunay三角剖分,并使用alphashape函数生成Alpha Shape多边形。然后,使用PolygonPatch将Alpha Shape多边形绘制在图像上。请确保已经安装了所需的Python库。