from math import *

def run():
    print("Podaj wspolrzedne punktow do analizy w postaci [x, y]")
    a = eval (input("Podaj wspolrzedne pierwszego punktu:"))



    b = eval (input("Podaj wspolrzedne drugiego punktu:"))
    c = eval (input("Podaj wspolrzedne trzeciego punktu:"))
    p1 = Point(a[0], a[1])
    p2 = Point(b[0], b[1])
    p3 = Point(c[0], c[1])

    line = Line(p1,p2)

    dist = line.getDistanceToPoint(p3)

    if (dist == 0):
        print ("Punkty leza na jednej lini")
    else:
        print (" Punkty nie leza na jednej linii")




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






class Line:
    #Constructor, accepts two points as an arguemnts
    def __init__(self, p1 ,p2):
        self.p1 = p1
        self.p2 = p2
        self.is_valid = True
        self.is_vertical = False
        self.a = 0
        self.b = 0
        if p1.x is p2.x and p1.y is p2.y:
            self.is_valid = False
        elif p1.x is p2.x:
            self.is_vertical = True
            self.vertical_pos = p1.x
        else:
            self.a = (p1.y - p2.y) / (p1.x - p2.x)
            self.b = (p1.y - self.a * p1.x   )


    def  getDistanceToPoint(self, point):
        if not self.is_valid:
            return None
        if not self.is_vertical:
            coefA = -self.a
            coefB = 1
            coefC = -self.b

            dist = abs(coefA * point.x + coefB * point.y + coefC)  / sqrt(pow(coefA,2) + pow(coefB,2))
            return  dist
        else:
            print("calculating vertical line")
            dist = abs (self.p1.x - point.x)
            return dist


def runTest1():
    a = Point(0,2)
    b = Point(5,2)
    c = Point(3,3)

    line = Line(a,b)

    print ("Line \"a\"" + str(line.a) )

    print ("C dist from line = " + str(line.getDistanceToPoint(c)))


def runTest2():
    a = Point(0,0)
    b = Point(1,1)
    c = Point(0,1)

    line = Line(a,b)

    print ("Line \"a\"" + str(line.a) )

    print ("C dist from line = " + str(line.getDistanceToPoint(c)))


def runTest2():
    a = Point(0,0)
    b = Point(1,1)
    c = Point(0,1)

    line = Line(a,b)

    print ("Line \"a\"" + str(line.a) )

    print ("C dist from line = " + str(line.getDistanceToPoint(c)))


def runTest3():
    a = Point(0,0)
    b = Point(0,1)
    c = Point(1,0)

    line = Line(a,b)

    if line.is_vertical is True:
        print("Line is vertical")

    print ("Line \"a\"" + str(line.a) )

    print ("C dist from line = " + str(line.getDistanceToPoint(c)))






run()