python计算点与多边形距离的代码是什么

以下是计算点与多边形距离的 Python 代码示例：

import math

def point_to_line_distance(point, line):
    # 计算点到线段的距离
    px, py = point
    x1, y1 = line[0]
    x2, y2 = line[1]
    dx = x2 - x1
    dy = y2 - y1
    if dx == dy == 0:
        # 线段退化为点
        return math.hypot(px - x1, py - y1)

    t = ((px - x1) * dx + (py - y1) * dy) / (dx * dx + dy * dy)

    if t < 0:
        # 超出线段左端点
        return math.hypot(px - x1, py - y1)

    elif t > 1:
        # 超出线段右端点
        return math.hypot(px - x2, py - y2)

    else:
        # 投影点在线段内
        proj_x = x1 + t * dx
        proj_y = y1 + t * dy
        return math.hypot(px - proj_x, py - proj_y)

def point_to_polygon_distance(point, polygon):
    # 计算点到多边形的距离
    min_dist = float("inf")
    for i in range(len(polygon)):
        line = [polygon[i], polygon[(i+1)%len(polygon)]]
        dist = point_to_line_distance(point, line)
        if dist < min_dist:
            min_dist = dist
    return min_dist

# 使用示例
point = (2, 2)
polygon = [(0, 0), (4, 0), (4, 4), (0, 4)]
print(point_to_polygon_distance(point, polygon))