## Everything following a '#' is a 'comment'. Comments are
## explanations for the programmer or other human beings looking at
## the code. The Python interpreter ignores them.  All lines that do
## not start with a '#', are instructions for the Python interpreter.

## Load the pygame library, so that we can use the functionality it
## provides.

import pygame


## Define a function called run_game.
## This function defines our whole game, which is a very simple
## game. All it does is display a picture.

def run_game():
    
    ## Initialize the pygame submodules.

    pygame.init()

    ## Open the pygame window with the specified width and height. We
    ## call our pygame window 'my_win'.

    width = 640
    height = 480
    my_win = pygame.display.set_mode((width,height))

    ## This is the "game loop". We will talk much more about the game
    ## loop next week. For now: the game loop keeps the pygame window
    ## on the screen until you click the 'X' in the upper right hand
    ## corner.

    keepGoing = True    
    while (keepGoing):

        ## Here we check whether somebody clicked the 'X' in the upper
        ## right hand corner of the pygame window.

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                keepGoing = False


        ###### START: This is the beginning of the part that you need to
        ######        look at for this first lab exercise.

        ## Make the background black.
        ##
        ## We specify colors using the expression
        ## 'pygame.color.Color(<Color Name>)', where '<Color Name>'
        ## needs to be replaced by an actual color name in
        ## quotes. (Note 1: The quotes are important. Note 2: I will
        ## always use angular brackets for places where you need to
        ## substitute in an expression.)  For more supported color
        ## names, look at the table of X11 colors on this page:
        ## http://en.wikipedia.org/wiki/Web_colors. (Note: for pygame
        ## all letters need to be lower case.)

        my_win.fill(pygame.color.Color("black"))

        ## Draw two rectangles.
        ##
        ## We specify where we want to draw it by giving the name of
        ## our pygame window - 'my_win'.  We specify a color (as
        ## described above).  We specify where in the window to put
        ## the rectangles. This is done by giving a tuple of four
        ## numbers. The third number specifies the width of the
        ## rectangle and the fourth number specifies the height.  The
        ## first two numbers specify the x-coordinate and the
        ## y-coordinate of the upper left hand corner of the
        ## rectangle. The origin of the coordinate system is in the
        ## upper left hand corner of the pygame window. x values
        ## increase going from the left to right; y values increase
        ## going from top to bottom.

        pygame.draw.rect(my_win, pygame.color.Color('white'), (100,100,50,50))
        pygame.draw.rect(my_win, pygame.color.Color('darkmagenta'), (140,140,70,40))

        ## Draw a circle.
        ##
        ## We specify the window, the color, the position (x and y
        ## coordinates) of the center, and the radius.

        pygame.draw.circle(my_win, pygame.color.Color('navy'), (500,250),75)

        ## Draw a line.
        ##
        ## We specify the window, the color, the starting point and
        ## the ending point of the line.

        pygame.draw.line(my_win,pygame.color.Color('deeppink'),(50,320),(550,200))

        ## Draw a polygon.
        ##
        ## We specify the window, the color, and a list of points -
        ## each points represents one corner.

        pygame.draw.polygon(my_win,pygame.color.Color('darkgreen'), [(150,300),(150+80,300),(150+40,300+120)])

        ###### END: This is the end of the part that you need to look at
        ######      for this first lab exercise.


        ## Show the pygame window.

        pygame.display.update()

    ## The game loop ends here.

    ## This closes your pygame window after we have left the game
    ## loop, i.e., after somebody closed the window.

    pygame.quit()



## Call the function run_game.

run_game()