题解 | 点到直线距离

import math

class Point:
    def __init__(self, x, y):
        self.x = x
        self.y = y

class Line:
    def __init__(self, point_a, point_b):
        self.point_a = point_a
        self.point_b = point_b
        self.A = point_b.y - point_a.y
        self.B = point_a.x - point_b.x
        self.C = point_b.x * point_a.y - point_a.x * point_b.y

def get_distance(P, L):
    # TODO: 计算点P到直线L的距离
    if L.point_a.x == L.point_b.x:  
        return abs(P.x - L.point_a.x)
    else:
        return abs(L.A * P.x + L.B * P.y + L.C)/(math.sqrt(L.A ** 2 + L.B ** 2))
    pass

































































































































































































def main():
    a, b = map(int, input().split())
    sx, sy, tx, ty = map(int, input().split())
    
    point_a = Point(sx, sy)
    point_b = Point(tx, ty)
    point_c = Point(a, b)
    line = Line(point_a, point_b)
    
    print("{:.2f}".format(get_distance(point_c, line)))

if __name__ == "__main__":
    main()