Matplotlib.patches.Wedge类

Python matplotlib.patches.Wedge类用于在绘图中添加楔形斑块。楔子以xy = (x, y)为中心，半径为r，它从theta1扫到theta2（单位：度）。如果给定了宽度，部分楔形将从内半径r-宽度画到外半径r。

语法:

matplotlib.patches.Wedge(center, r, theta1, theta2, width=None, **kwargs)

参数:

1. center:楔子的中心点。
   2. r:楔体半径。

   3. theta1:第一掠角。

   4. theta2:第二个扫描角度。

   5. width:扫描的宽度

示例1

import numpy as np
from matplotlib.patches import Circle, Wedge, Polygon
from matplotlib.collections import PatchCollection
import matplotlib.pyplot as plt
 
 
# Fixing random state for reproducibility
np.random.seed(19680801)
 
fig, ax = plt.subplots()
 
resolution = 50  # the number of vertices
N = 3
x = np.random.rand(N)
y = np.random.rand(N)
radii = 0.1 * np.random.rand(N)
patches = []
 
for x1, y1, r in zip(x, y, radii):
    circle = Circle((x1, y1), r)
    patches.append(circle)
 
x = np.random.rand(N)
y = np.random.rand(N)
radii = 0.1 * np.random.rand(N)
theta1 = 360.0 * np.random.rand(N)
theta2 = 360.0 * np.random.rand(N)
 
for x1, y1, r, t1, t2 in zip(x, y, radii,
                             theta1, theta2):
    wedge = Wedge((x1, y1), r, t1, t2)
    patches.append(wedge)
 
# Some limiting conditions on Wedge
patches += [
    Wedge((.3, .7), .1, 0, 360),             # Full circle
    Wedge((.7, .8), .2, 0, 360, width = 0.05),  # Full ring
    Wedge((.8, .3), .2, 0, 45),              # Full sector
    Wedge((.8, .3), .2, 45, 90, width = 0.10),  # Ring sector
]
 
for i in range(N):
    polygon = Polygon(np.random.rand(N, 2), True)
    patches.append(polygon)
 
colors = 100 * np.random.rand(len(patches))
p = PatchCollection(patches, alpha = 0.4)
p.set_array(np.array(colors))
ax.add_collection(p)
fig.colorbar(p, ax = ax)
 
plt.show()

输出:

示例2

import numpy as np
import matplotlib.pyplot as plt
 
 
fig, ax = plt.subplots(figsize =(6, 3),
                       subplot_kw = dict(aspect ="equal"))
 
recipe = ["375 g flour",
          "75 g sugar",
          "250 g butter",
          "300 g berries"]
 
data = [float(x.split()[0]) for x in recipe]
ingredients = [x.split()[-1] for x in recipe]
 
 
def func(pct, allvals):
    absolute = int(pct / 100.*np.sum(allvals))
     
    return "{:.1f}%\n({:d} g)".format(pct, absolute)
 
 
wedges, texts, autotexts = ax.pie(data,
                                  autopct = lambda pct: func(pct, data),
                                  textprops = dict(color ="w"))
 
ax.legend(wedges, ingredients,
          title ="Ingredients",
          loc ="center left",
          bbox_to_anchor =(1, 0, 0.5, 1))
 
plt.setp(autotexts, size = 8, weight ="bold")
 
ax.set_title("Recipe for a pie")
 
plt.show()

输出: