class Point(object): 
    """represents a point in 2-D space"""

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

    def __add__(self, other):
        return Point(self.x + other.x, self.y + other.y)

class Rectangle(object): 
    """represent a rectangle. 
       attributes: width, height, corner (lower left), color.
      """

    def __init__(self, width, height, corner, color):
        self.width = width
        self.height = height
        self.corner = corner
        self.color = color

    def draw(r, canvas):
        """Draws r on canvas."""
        bbox = [[r.corner.x, r.corner.y], [r.corner.x + r.width, r.corner.y + r.height]]
        canvas.rectangle(bbox, outline='black', width=2, fill=r.color)

    def move(self, displacement):
        self.corner = self.corner + displacement


class Circle(object):
    """represents a circle.
       attributes: center, radius, color.
       """

    def __init__(self, center, radius, color):
        self.center = center
        self.radius = radius
        self.color = color

    def draw(c, canvas):
        canvas.circle([c.center.x,c.center.y], c.radius, outline=None, fill=c.color)

    def move(self, displacement):
        self.center = self.center + displacement
    
class Polygon(object):
    """attributes: a list of points and a color"""

    def __init__(self, points, color):
        self.points = points
        self.color = color

    def draw(p, canvas):
        canvas.polygon ([[pt.x, pt.y] for pt in p.points], fill= p.color)

    def move(self, displacement):
        self.points = [pt + displacement for pt in self.points]

class Composite(object):
    """atributes: a list of constituent shapes"""

    def __init__(self, shapes):
        self.shapes = shapes

    def draw(self, canvas):
        for shape in self.shapes:
            shape.draw(canvas)

    def move(self, displacement):
        for shape in self.shapes:
            shape.move(displacement)

from World import World

def show(image):
    w = World() 
    canvas = w.ca(width=500, height=500, background='white')
    image.draw(canvas)
    w.mainloop()


def flagOfBangladesh():
    rect = Rectangle(color='green4', corner=Point(-150,-100), height=200, width=300)
    c = Circle(radius=70, color='red', center=Point(-25,0))
    return Composite([rect, c])

def flagOfCzechRepublic():
    redRect = Rectangle(color='red', corner=Point(-150,-100), height=200, width=300)
    whiteRect = Rectangle(color='white', corner=Point(-150,0), height=100, width=300)
    background = Composite([redRect, whiteRect])
    triangle = Polygon(points=[Point(-150,-100),Point(-150,100),Point(-10,0)], color = 'blue')
    return Composite([background, triangle])