# drawing.py
# ----------
# Nelson Mason
# updated 9-23-2025
# Due by 9-29-2025
# (This is an animation of a sunrise.)

from turtle import *
from superturtle.animation import animate

# define 3 objects
# sky, ground, sun
# In the actual animation, the sun will start off entirely below the horizon,
# (where the sky meets the ground), hidden by the ground, and will slowly rise (move up the screen),
# with the sun, sky, and ground changing color. The disk of the sun will
# be apparent only in the sky, as it rises. I will be using color shading techniques in the animation.

# I played around with the RGB settings. I left out drawing the sun 
# casting a shadow on the ground while rising.
# Perhaps for another project?

# YOU CAN'T BEAT MOTHER NATURE FOR A SUNRISE!

def rectangle(b, c, d, e, f): # draws the sky first, then after the sun is drawn, the ground
   for x in range(2): # as the sun rises sky color changes from black to blue, ground changes
       # from black to dark green
       begin_fill()
       fillcolor(d, e, f)
       forward(b)
       left(90)        
       forward(c)
       left(90)
       end_fill()

def sun():
   begin_fill() # draw the sun
   fillcolor(1, a/550, 0) # as the sun rises sun color changes from red to orange
   circle(-75,360) 
   end_fill()

def sun_position(a): # this must be called to get the sun to move up (rise)
    penup()
    left(90)
    forward(a)
    right(90)
    pendown()

for frame in animate(frames=550, loop=True): # close Turtle Graphic to end the loop
   a = frame.interval=1100 # the frames-to-interval ratio controls the animation speed
   a = frame.interpolate(0, 275) # low and high positions of the sun as it rises
   
   b=400 # rectangle width
   c=300 # rectangle sky height
   d=0.05 # for RGB
   e=0.05 # for RGB
   f=a/275 # for RGB
   g=0.05 # for RGB
   h=a/1100 # for RGB
   i=0.05 # for RGB
   j=c/2 # rectangle ground height

   penup() # reposition the turtle before drawing the sky
   right(180)
   forward(200)
   left(90)
   forward(50)
   left(90)
   pendown()
   rectangle(b,c,d,e,f) # draws the sky
   penup() # reposition the turtle before drawing the sun
   forward(200) # starting the drawing of the sun right on the horizon
   # makes it easier to calculate everything else
   pendown()
   sun_position(a)
   sun() # draws the sun   
   penup() # reposition the turtle before drawing the ground
   right(180)
   forward(200)
   left(90)
   forward(+a) # increment to get to the correct starting point for 
   # the next iteration(re-drawing) of the sun rising
   forward(150)
   left(90)
   pendown()
   # I want the ground to hide the sun (overlay), but not the sky (obviously)
   rectangle(b,j,g,h,i) # draws the ground (call function with parameters by position)
   penup()
   left(90)
   forward(j)
   right(90)

input()