# drawing.py
# ----------
# By Jannatun Uddin
#
# (It makes 3 buildings that flicker from dark gray and gets dimmer.Also, if tou look closely at the buildings you can see it get closer too.)
from superturtle.animation import animate
from turtle import forward, left, right, backward, penup, pendown, begin_fill, end_fill, pencolor, fillcolor

def draw_building(width, height, color="gray"):
    pencolor(color)
    fillcolor(color)
    begin_fill()
    for i in range(2):
        forward(width)
        left(90)
        forward(height)
        left(90)
    end_fill()

# This is an Animation
for frame in animate(40, loop=True):
    shade = int(frame.interpolate(100, 200, mirror=True))
    color = f"#{shade:02x}{shade:02x}{shade:02x}"

    penup()
    backward(200)
    pendown()

    # Building 1
    draw_building(60, 200, color)

    # Building 2
    penup()
    forward(80)
    pendown()
    draw_building(50, 120, color)

    # Building 3
    penup()
    forward(70)
    pendown()
    draw_building(90, 300, color)