Review

     So, remember, when we did the color of the circle, we typed "255, 0, 0"? Well, this is a color system used in most computer languages: R.G.B. It stands for Red, Green, & Blue. Simple. The max number you can have of one of those colors is 255, and the least is evidently 0. The higher the number of one color is, it will look more like that one. There are over 600 colors! Some are 255, 255, 255 (white), 255, 0, 0 (red), 0, 0, 255 (dark blue), 0, 255, 255 (light blue), 255, 0, 255 (pink), 0, 0, 0 (black), 0, 255, 0 (light green), and 255, 255, 0 (yellow). That's only some of the main ones. And that was quite a lot. You can try experimenting around with the colors and see what you find. If you know your color mixtures, then you should already have an idea of what colors you can figure out.
     Okay, off of the topic of color, let's go to coordinates. You might have learned about coordinates in math class, with the X axis (the horizontal line) and the Y axis (the vertical line going through the X axis). You use these same coordinates when placing something on the screen (remember, the X axis goes first, down the hall, and then the Y axis, up the stairs). Remember that (0, 0) starts at the top left corner of the screen. Well, if you have learned about coordinates in math, you would know that (0, 0) should be in the middle, but, apparently, this is one of the many programming mysteries of the world. So, remember, this: The X axis goes along the top of the window, and the Y axis will go down. Kick that knowledge of normal coordinates out and memorize those computer coordinates. With the size of the screen we always use, (320, 240) should be the middle.

import pygame, sys

pygame.init()
screen = pygame.display.set_mode([640, 480])
screen.fill([0, 255, 0])
pygame.draw.circle(screen, [255, 100, 0], [320, 240], 30, 0)
pygame.display.flip()
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()

     Well, there's a code to verify. Let's see what happens when we run it.

     Ha! I bet you thought I forgot it was St. Patrick's Day! Nah, those colors are a sure sign I didn't. I wouldn't want you to track me down just so you could pinch me!

     We'll continue the review next time. I have to go slay an evil death dragon in a Pygame now. Bye!