python 用 matplotlib 中的 patches 模块绘制圆形步骤详解

版本说明：

 

0、import

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.patches import Circle

1、绘制圆形

# 创建画布
fig = plt.figure(figsize=(12, 8),
                 facecolor='beige',    # 米黄色
                )
# 划分子区
axes = fig.subplots(nrows=2,
                    ncols=2,
                  )

# ---------------------------------  subplot(221) ---------------------------------
ax = axes[0, 0]
cicle = Circle(xy=(2, 2),    # 圆心坐标
               radius=2,    # 半径
               fc='white',    # facecolor
               ec='cornflowerblue',    # 浅蓝色，矢车菊蓝
               
              )
ax.add_patch(p=cicle)
circle.set(facecolor='yellow',
           alpha=0.5,
           hatch='/',
           ls='-.',
           ec='r'
          )


# 调整坐标轴刻度范围
ax.set(xlim=(-1, 5),
       ylim=(-1, 5)
      )

# ---------------------------------  subplot(222) ---------------------------------
ax = axes[0, 1]
rectangle = ax.patch
rectangle.set(facecolor='gold',
              alpha=0.7
             )

circle = Circle(xy=(2, 2),    # 圆心
                radius=2,    # 半径
               )
ax.add_patch(p=circle)
circle.set(fc='red',    # facecolor
           ec='green',    # edgecolor,
           alpha=0.6,
           lw=2,    # line widht
          )

# 调整坐标轴
ax.set(xlim=(-1, 5),
       ylim=(-1, 5),
       aspect='equal'    # x 轴和 y 轴的刻度单位比率
      )

# ---------------------------------  subplot(223) ---------------------------------
ax = axes[1, 0]
rectangle = ax.patch
rectangle.set(facecolor='palegreen',    # 淡绿色，苍绿色
              alpha=1
             )

circle = Circle(xy=(2, 2),    # 圆心
                radius=2,    # 半径
               )
ax.add_patch(p=circle)
circle.set(fc='red',    # facecolor
           ec='yellow',    # edgecolor,
           alpha=0.6,
           lw=5,    # line widht
          )

# 调整坐标轴
ax.axis('equal'    # x 轴和 y 轴的刻度单位比率
      )

# ---------------------------------  subplot(224) ---------------------------------
ax = axes[1, 1]
rectangle = ax.patch
rectangle.set(facecolor='lightskyblue',
              alpha=1
             )

circle = Circle(xy=(2, 2),    # 圆心
                radius=2,    # 半径
               )
ax.add_patch(p=circle)
circle.set(fc='white',    # facecolor
           ec='magenta',    # edgecolor, 品红
           alpha=0.6,
           lw=5,    # line widht
          )

# 调整坐标轴
ax.axis([-1, 5, 1, 5])    # 坐标轴刻度范围 [xmin, xmax, ymin, ymax]
ax.set(aspect='equal',    # x 轴和 y 轴的刻度单位比率
       yticks=range(-1, 6, 1)    # 刻度位置
      )


# 设置子区布局
plt.subplots_adjust(left=0.1,
                    right=0.8
                   )


# 显示图形
plt.show()

图形：