Matplotlib.patches.Rectangle()

Python Rectangle(matplotlib.patches.Rectangle)类用于用来将矩形补丁打到左下角xy = (x, y)处，并指定宽度、高度和旋转角度。

语法:

matplotlib.patches.Rectangle(xy, width, height, angle=0.0， **kwargs) 

参数:

• xy:开始绘制矩形的左下方点
• 宽度:矩形的宽度
• height:矩形的高度。
• angle:矩形的旋转角度。

示例1

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.patches import Rectangle
  
  
# The image
X = np.arange(16).reshape(4, 4)
  
# highlight some feature in the
# middle boxes.
fig = plt.figure()
  
ax = fig.add_subplot(111)
ax.imshow(X, cmap = plt.cm.gray,
          interpolation ='nearest')
ax.add_patch( Rectangle((0.5, 0.5),
                        2, 2,
                        fc ='none', 
                        ec ='g',
                        lw = 10) )
  
plt.show()

输出:

示例2

import matplotlib
import matplotlib.pyplot as plt
  
  
fig = plt.figure()
ax = fig.add_subplot(111)
  
rect1 = matplotlib.patches.Rectangle((-200, -100),
                                     400, 200,
                                     color ='green')
  
rect2 = matplotlib.patches.Rectangle((0, 150),
                                     300, 20,
                                     color ='pink')
  
rect3 = matplotlib.patches.Rectangle((-300, -50),
                                     40, 200,
                                     color ='yellow')
  
ax.add_patch(rect1)
ax.add_patch(rect2)
ax.add_patch(rect3)
  
plt.xlim([-400, 400])
plt.ylim([-400, 400])
  
plt.show()

输出: