# This is an answer to Exercise 15.4 done using objects.

from World import World

class Point(object):
    '''represents a point in 2-D space
       attributes: x, y. 
    '''

class Rectangle(object):
    '''represents a rectangle.
       attributes: width, height, corner, color.
    '''

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

class Polygon(object):
    '''represents a polygon.
       attributes: points, color.
    '''

def draw_rectangle(canvas, rect):
    '''Draws a reprentation of the Rectangle rect on the Canvas canvas.'''
    bbox = [[rect.corner.x, rect.corner.y],
            [rect.corner.x + rect.width, rect.corner.y + rect.height]]
    canvas.rectangle(bbox, outline='black', width=2, fill=rect.color)

def draw_circle(canvas, circle):
    '''Draws a reprentation of the Circle circle on the Canvas canvas.'''
    canvas.circle([circle.center.x, circle.center.y],
                  circle.radius, fill=circle.color)

def draw_polygon(canvas, pgon):
    '''Draws a reprentation of the Polygon pgon on the Canvas canvas.'''
    canvas.polygon([[pt.x, pt.y] for pt in pgon.points], fill=pgon.color)

########## Bangladesh flag
def bangladesh():
    world = World()
    canvas = world.ca(width=500, height=500, background='white')

    rect = Rectangle()
    rect.width = 300
    rect.height = 200
    rect.corner = Point()
    rect.corner.x, rect.corner.y =  -150, -100
    rect.color = 'green4'
    draw_rectangle(canvas, rect)

    circle = Circle()
    circle.center = Point()
    circle.center.x = -25
    circle.center.y = 0
    circle.radius = 70
    circle.color = 'red'
    draw_circle(canvas, circle)

    world.mainloop()

########## Czech flag
def czech():
    world = World()
    canvas = world.ca(width=500, height=500, background='white')

    rect = Rectangle()
    rect.width = 300
    rect.height = 200
    rect.corner = Point()
    rect.corner.x, rect.corner.y =  -150, -100
    rect.color = 'white'
    draw_rectangle(canvas, rect)

    center = Point()
    center.x, center.y = 0, 0
    ul = Point()
    ul.x, ul.y = -150, 100
    ll = Point()
    ll.x, ll.y = -150, -100
    mr = Point()
    mr.x, mr.y = 150, 0
    lr = Point()
    lr.x, lr.y = 150, -100

    pgon1 = Polygon()
    pgon1.points = [ul, ll, center]
    pgon1.color = 'blue4'
    draw_polygon(canvas, pgon1)

    pgon2 = Polygon()
    pgon2.points = [ll, center, mr, lr]
    pgon2.color = 'red3'
    draw_polygon(canvas, pgon2)

    world.mainloop()