draw_th_flag_turtle.py

## GitHub: dark-teal-coder 
## First Published Date: 2021-09-21
## Program Input(s): 
### (1) taking a number representing the width of the flag
## Program Process(es): 
### (1) setting up the screen and using the turtle module to draw the flag line by line 
## Program Output(s): 
### (1) a new pop-up window with the flag of Thailand
## Program Description: This program draws a flag of Thailand using Python built-in Turtle module. 

####################################################################################################

import turtle


def set_up_screen():
	## Create a turtle window object
	screen = turtle.Screen()
	## Maximize the screen
	screen.setup(width=0.5, height=1.0)
	## Change the title of the turtle window
	screen.title("See Python turtle draw flag of Thailand! ~Ree")


def draw_stripe(t, fill_color: str, flag_wid: int, flag_len: int) -> None:
	"""This function draws a color-filled stripe."""
	t.pendown()
	t.color(fill_color, fill_color)
	t.begin_fill()
	## Set turtle's orientation to east
	t.setheading(0)
	t.forward(flag_len)
	t.right(90)
	## Each stripe on the TH flag is one sixth of its width
	t.forward(flag_wid/6)
	t.right(90)
	t.forward(flag_len)
	t.right(90)
	t.forward(flag_wid/6)
	t.end_fill()
	## Set turtle's orientation to south
	t.setheading(270)
	t.forward(flag_wid/6)
	t.penup()


def draw_flag(width):
	## Create a turtle object
	t = turtle.Turtle()
	## Change pen thickness
	t.pensize(1)
	## Set drawing speed
	t.speed(100)

	## Flag ratio
	flag_wid = width
	flag_len = (9/6) * flag_wid

	## Pen up and go to the top left corner of the flag
	t.penup()
	t.goto(-(flag_len/2), flag_wid/2)
	## Start drawing
	colors = ["red", "white", "blue"]
	for color in colors:
		draw_stripe(t, color, flag_wid, flag_len)
	for color in colors[::-1]:
		draw_stripe(t, color, flag_wid, flag_len)
	## Make turtle invisible
	t.hideturtle()


if __name__ == '__main__':
	set_up_screen()
	draw_flag(width=200)
	## Listen to events before continuing
	# turtle.mainloop()
	try:
		turtle.exitonclick()
	except:
		print("The program didn't exit properly!")

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## REFERENCES:
### Thailand's flag ratio: https://asean.org/wp-content/uploads/2012/05/Flag-of-the-Kingdom-of-Thailand.pdf