我正在使用集合绘制圆圈组,但无法生成三个类别的图例。我想:
- 猫 1:红色圆圈
- 猫 2:蓝色圆圈
- 猫 3:黄色圆圈
import matplotlib
import matplotlib.pyplot as plt
from matplotlib.collections import PatchCollection
from matplotlib.patches import Circle
import numpy as np
# (modified from one of the matplotlib gallery examples)
resolution = 50 # the number of vertices
N = 50
Na = 25
Nb = 10
x = np.random.random(N)
y = np.random.random(N)
radii = 0.1*np.random.random(30)
xa = np.random.random(Na)
ya = np.random.random(Na)
radiia = 0.1*np.random.random(50)
xb = np.random.random(Nb)
yb = np.random.random(Nb)
radiib = 0.1*np.random.random(60)
patches = []
patchesa = []
patchesb = []
for x1,y1,r in zip(x, y, radii):
circle = Circle((x1,y1), r)
patches.append(circle)
for x1,y1,r in zip(xa, ya, radiia):
circle = Circle((x1,y1), r)
patchesa.append(circle)
for x1,y1,r in zip(xb, yb, radiib):
circle = Circle((x1,y1), r)
patchesb.append(circle)
fig = plt.figure()
ax = fig.add_subplot(111)
colors = 100*np.random.random(N)
p = PatchCollection(patches, cmap=matplotlib.cm.jet, alpha=0.4, label= "Cat 1", facecolor="red")
pa = PatchCollection(patchesa, cmap=matplotlib.cm.jet, alpha=0.3, label= "Cat 2", facecolor="blue")
pb = PatchCollection(patchesb, cmap=matplotlib.cm.jet, alpha=0.4, label= "Cat 3", facecolor="yellow")
#p.set_array(colors)
ax.add_collection(p)
ax.add_collection(pa)
ax.add_collection(pb)
ax.legend(loc = 2)
plt.colorbar(p)
print p.get_label()
plt.show()
PathCollection
s 不是可迭代对象,因此尝试通过以下方式生成图例;
legend([p, pa, pb], ["cat 1", "2 cat", "cat 3"])
不起作用。
字幕怎么会出现?
我的系统在 Python 2.7 和 Matplotlib 1.2.0_1 上运行
请注意,该命令print p.get_label()
显示该对象具有关联的标签,但 matplotlib 无法挂载图例。