快速嵌套for在矩阵中绘制圆

import numpy as np

def draw_circle(matrix, cx, cy, r):
    for i in range(len(matrix)):
        for j in range(len(matrix[0])):
            x = j
            y = i
            distance = np.sqrt((x - cx)**2 + (y - cy)**2)
            if distance <= r:
                matrix[i][j] = '.'

# 创建一个10x10的矩阵
matrix = [[' ' for _ in range(10)] for _ in range(10)]

# 绘制圆
draw_circle(matrix, 4, 4, 3)

# 打印结果
for row in matrix:
    print(' '.join(row))

          . . . .          
      . . . . . . . .      
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    . . . . . . . . . .    
      . . . . . . . .      
          . . . .