## 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

## 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):


    ###### 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()

    ## 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

## This closes your pygame window.

pygame.quit()