ORIGINAL_Shapes2D_template

from math import atan2, cos, sin, pi

class Point2D:
    """
    Point 2D Class
        Each object is point in the x-y plane.
        Coordinates are 2 floating point numbers x and y.
    """
    __precision = 10

    def __init__(self, x=0, y=0):
        """
        Point2d Constructor
            Default value is (0, 0)
        """
        self.__r  = (x**2 + y**2)**0.5
        self.__th = atan2(y, x)

    def getX(self):
        """
        Get radius of equivalent polar coordinate.
        """
        return round(self.__r * cos(self.__th), Point2D.__precision)

    def getY(self):
        """
        Get radius of equivalent polar coordinate.
        """
        return round(self.__r * sin(self.__th), Point2D.__precision)

    def translateX(self, x):
        """
        Translate in the x direction
        """
        nx = x + self.getX()
        ny = self.getY()
        self.__r  = (nx**2 + ny**2)**0.5
        self.__th = atan2(ny, nx)

    def translateY(self, y):
        """
        Translate in the y direction
        """
        nx = self.getX()
        ny = y + self.getY()
        self.__r  = (nx**2 + ny**2)**0.5
        self.__th = atan2(ny, nx)

    def getRadius(self):
        """
        Get radius of equivalent polar coordinate.
        """
        return round(self.__r, Point2D.__precision)

    def getTheta(self):
        """
        Get angle of equivalent polar coordinate.
        """
        return round(self.__th, Point2D.__precision)

    def extend(self, r):
        """
        Increase radius by a factor of r.
        """
        self.__r  *= r


    def rotate(self, th):
        """
        Increase angle by th radians.
        """
        self.__th += th


    def getDistance(self, other):
        """
        Return distance between two points.
        """
        dx = self.getX() - other.getX()
        dy = self.getY() - other.getY()
        return (dx**2 + dy**2)**0.5

    def getSlope(self, other):
        """
        Return the slope of the line containing both points.
        """
        dx = self.getX() - other.getX()
        dy = self.getY() - other.getY()
        return dy/dx

    def getMidpoint(self, other):
        """
        Return a Point2D object with coordinates
        equal to the midpoint of the line segment
        connecting self and other.
        """
        dx = self.getX() + other.getX()
        dy = self.getY() + other.getY()
        return Point2D(dx/2.0, dy/2.0)

from copy import deepcopy

class Shape2D:
    """
    Shape 2D Class
        Each object is shape in the x-y plane.
        A shape in this context is defined as a set of points
        that are connected one after the other, where the
        last point is connected to the first point as well.
    """
    def __init__(self, points=[]):
        """
        Shape2D Constructor
            Defaults to no points yet.
        """
        self._points = points
        self._nsides = len(self._points)

    def set_points(self, new_points):
        self._points = new_points
        self._nsides = len(self._points)

    def clear_points(self):
        self._points = []
        self._nsides = 0

    def get_points(self):
        # Uses deep copy to ensure returned copy
        # does not modify original list.
        return deepcopy(self._points)

    def print_points(self):
        # Prints each point as (x, y)
        for p in self.get_points():
            print(f"({p.getX()}, {p.getY()}), ", end="")
        print()
        return deepcopy(self._points)


    def copy(self):
        # Returns a copy of the shape
        return Shape2D(self.get_points())

    def add_point(self, new_point):
        self._points.append(new_point)
        self._nsides = len(self._points)

    def get_allX(self):
        return [p.getX() for p in self.get_points()]

    def get_allY(self):
        return [p.getY() for p in self.get_points()]

    def translateX(self, x):
        """
        Translate all points to the x direction
        """
        for i in range(self._nsides):
            self._points[i].translateX(x)

    def translateY(self, y):
        """
        Translate all points to the y direction
        """
        for i in range(self._nsides):
            self._points[i].translateY(y)

    def rotate(self, th):
        """
        Rotates all points about the origin
        """
        for i in range(self._nsides):
            self._points[i].rotate(th)
        return

    def getPerimeter(self):
        """
        Returns the perimeter of the shape
        """
        perim = 0
        for i in range(self._nsides):
            perim += self._points[i-1].getdistance(self._points[i])
        return perim

class Triangle(Shape2D):
    def __init__(self, points=[]):
        """
        Triangle Constructor
            Defaults to [(0,0), (1,0), (0,1)].
        """
        self.set_points(points)
        self._nsides = 3

    def set_points(self, points):
        if len(points) == 3:
            self._points = points
        else:
            print("Only Three Points Allowed, using default values")
            self._points = [Point2D(0,0), Point2D(1,0), Point2D(0,1)]


class Square(Shape2D):
    def __init__(self, side=1, center=(0,0)):
        """
        Square Constructor
            Defaults to Unit Square
            centered at the origin.
        """
        self._points =  [Point2D(0.5,0.5), Point2D(-0.5,0.5), \
                         Point2D(-0.5,-0.5), Point2D(0.5,-0.5)]
        self._nsides = 4

    def scale(self, r):
        """
        Increases square side length by a factor of r.
        Center of the square is maintained.
        """
        for i in range(4):
            self._points[i].extend(r)

    def get_center(self):
        """
        Returns the center of the square.
        """
        return (0, 0)

    def set_center(self, c):
        """
        Sets the center of the square.
        """
        return

import matplotlib.pyplot as plt
# May require `python -m pip install -U matplotlib`

class Drawing:
    def __init__(self, shape_list=[]):
        temp = [issubclass(type(x), Shape2D) for x in shape_list]
        if False in temp:
            # Check if any element of shape_list is not a Shape2D
            print("Invalid list of shapes, creating empty list instead.")
            self.__shape_list=[]
        # Create a list member that would store the given shapes
        self.__shape_list=[]

    def show(self, a=1):
        fig, ax = plt.subplots()
        # Plot each Shape2D in a figure

        for shape in self.__shape_list:
            x_list = shape.get_allX()
            y_list = shape.get_allY()
            ax.plot(x_list + [x_list[0]], y_list + [y_list[0]], alpha=a)
        plt.show()

    def add_shape(self, shape):
        if not (issubclass(type(shape), Shape2D)):
            print("Invalid Shape2D")
            return
        # Insert shape to list of Shape2D
        self.__shape_list.append(shape)

    def clear(self):
        # Remove all the Shape2D
        self.__shape_list=[]