CODEWITHSUNDEEP
pythonpython-3.x
Garret Ulrich
Garret Ulrich

Reputation: 461

Calculating the perimeter of my object given another class in Python

I was wondering how I can calculate the perimeter of my object called 'Rectangle' if I do not have the x-coordinates and y-coordinates saved in the Rectangle class.

class Point:

    def __init__(self, xcoord=0, ycoord=0):
        self.x = xcoord
        self.y = ycoord

    def setx(self, xcoord):
        self.x = xcoord

    def sety(self, ycoord):
        self.y = ycoord

    def get(self):
        return (self.x, self.y)

    def move(self, dx, dy):
        self.x += dx
        self.y += dy

class Rectangle:

    def __init__(self, bottom_left, top_right, colour):
        self.bottom_left = bottom_left
        self.top_right = top_right
        self.colour = colour

    def get_colour(self):
        return self.colour

    def get_bottom_left(self):
        return self.bottom_left

    def get_top_right(self):
        return self.top_right

    def reset_colour(self, colour):
        self.colour = colour

    def move(self,dx,dy):
        Point.move(self.bottom_left,dx,dy)
        Point.move(self.top_right,dx,dy)

    def get_perimeter(self):

I am calling the function in python shell in the following format

r1=Rectangle(Point(),Point(1,1),'red')
r1.get_perimeter()

Upvotes: 1

Views: 375

Answers (1)

Jean-François Fabre
Jean-François Fabre

Reputation: 140168

That's more basic geometry than Python.

Since you only provide bottom left and top right points I'm assuming that the rectangle has sides parallel to x/y axis. In that case:

def get_perimeter(self):
    return 2*(abs(self.top_right.x-self.bottom_left.x)+abs(self.bottom_left.y-self.top_right.y))

I've put the abs function for good measure because left & right, top & bottom doesn't presuppose of the orientation of the coordinate system.

Note: you have x and y of the 2 defining points "saved" (accessible) in your Rectangle class, not directly as a direct member, but as a member of a member.

Upvotes: 2

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