#  File: USFlag.py
#  Description: Draws a US Flag using Turtle graphics.
#  Student's Name: Robert Jurgens
#  Student's UT EID: rdj697
#  Course Name: CS313E
#  Unique Number: 51325
#
#  Date Created: 9/10/2016
#  Date Last Modified: 9/15/2016

import turtle
import math

## Initializing turtle...

height = eval(input("What is the vertical height of the flag in pixels? : "))
width = 1.9 * height
star_size = height * (((2 * (5 - (5 ** 0.5))) / 4225) ** .5)
screen = turtle.Screen()
screen.setup(width + 200, height + 200, 100, 100)
ttl = turtle.Turtle()
ttl.pu()
ttl.speed(10)
screen.bgcolor("black")

def drawFrame(width, height):

    ## Draw the frame

    ttl.goto(-width/2, height/2)
    ttl.pd()
    for i in range(2):
        ttl.forward(width)
        ttl.right(90)
        ttl.forward(height)
        ttl.right(90)

def drawStripes(width, height):

    ttl.color("red")
    ttl.fillcolor("red")
    for i in range(13):
        if ttl.pencolor() == "red":
            ttl.begin_fill()
            for i in range(2):
                ttl.forward(width)
                ttl.right(90)
                ttl.forward(height/13)
                ttl.right(90)
            ttl.end_fill()
            ttl.right(90)
            ttl.forward(height/13)
            ttl.left(90)
            ttl.color("white")
            ttl.fillcolor("white")
        else:
            ttl.begin_fill()
            for i in range(2):
                ttl.forward(width)
                ttl.right(90)
                ttl.forward(height/13)
                ttl.right(90)
            ttl.end_fill()
            ttl.right(90)
            ttl.forward(height/13)
            ttl.left(90)
            ttl.color("red")
            ttl.fillcolor("red")

def drawCanton(width, height):

    ## draw the canton
    canton_width = 2/5 * width
    canton_height = 7/13 * height
    ttl.penup()
    ttl.goto(-width/2, height/2)
    ttl.pendown()
    ttl.color("blue")
    ttl.fillcolor("blue")
    for i in range(2):
        ttl.begin_fill()
        ttl.forward(canton_width)
        ttl.right(90)
        ttl.forward(canton_height)
        ttl.right(90)
        ttl.end_fill()

def drawStar(width, height):
    ttl.speed(10)
    ttl.color("white")
    ttl.fillcolor("white")
    ttl.begin_fill()
    for i in range(5):
        ttl.forward(star_size)
        ttl.right(144)
    ttl.end_fill()

def padStars(width, height):
    horiz_padding = 1/30 * width
    vert_padding = 7/130 * height
    ttl.pu()
    ttl.forward(horiz_padding)
    ttl.right(90)
    ttl.forward(vert_padding)
    ttl.left(162)
    ttl.pd()

def main():
    ttl.hideturtle()
    drawFrame(width, height)
    drawStripes(width, height)
    drawCanton(width, height)
    padStars(width, height)
    ttl.penup()
    ttl.left(144)
    ttl.forward(.0117528 * height)
    ttl.right(144)
    ttl.pendown()
    for j in range(5):
        for i in range(6):
            drawStar(width, height)
            ttl.right(72)
            ttl.penup()
            ttl.forward(1/15 * width)
            ttl.left(72)
            ttl.pendown()
        ttl.pu()
        ttl.left(108)
        ttl.forward(6/15 * width)
        ttl.left(90)
        ttl.forward(7/65 * height)
        ttl.left(162)
        ttl.pendown()
    ttl.penup()
    ttl.left(18)
    ttl.forward(63/130 * height)
    ttl.right(90)
    ttl.forward(1/30 * width)
    ttl.left(72)
    for j in range(4):
        for i in range(5):
            drawStar(width, height)
            ttl.right(72)
            ttl.penup()
            ttl.forward(1/15 * width)
            ttl.left(72)
            ttl.pendown()
            ttl.pu()
        ttl.left(108)
        ttl.forward(5/15 * width)
        ttl.left(90)
        ttl.forward(7/65 * height)
        ttl.left(162)
        ttl.pendown()

main()
turtle.done()