PyGame Zero

In the Mu Editor there are some built-in tools for easily making Graphical User Interfaces (GUI Zero) and Games. The game environment is PyGame Zero which is a "zero boilerplate" version of PyGame. Mu makes it even easier to use by running it in the correct environment and giving you quick access to the correct folders for images and sound.

Have a quick look at the intro video on the Mu Editor site: codewith.mu tutorial pgzero

Then work through the tutorial at the pygame-zero docs: pygame zero: introduction'

The documentation is pretty good and Googling does help, just make sure you don't confuse PyGame with PyGame zero advice (you can use the latter, but it requires more understanding).

Resources

https://pygame-zero.readthedocs.io/en/stable/index.html
Paper Chase source code (made as a first game by the programmer behind the Mu Editor)
Space invaders tutorial: https://magpi.raspberrypi.org/articles/pygame-zero-invaders

Here's a quick example to demonstrate some of the basic features of Pygame Zero.

This "game" does not have user interaction. However, you can easily add user interaction by using the event handling hooks.

See the documentation for more.

# Magic global variables to set the window properties

WIDTH, HEIGHT = 320, 400

TITLE = "Alien Bouncer"

# New sprite using "alien.png" image shipped with Mu

alien = Actor("alien")

# Set its initial position and velocity

alien.x,  alien.y  = WIDTH/2, HEIGHT/2

alien.vx, alien.vy = 6, 7

# Runs 60 times per second by default

def draw():

    screen.clear()

    alien.draw()

# Runs 60 times per second by default

def update():

    # Move the alien

    alien.x = alien.x + alien.vx

    alien.y = alien.y + alien.vy

    # Check position on screen and bounce

    if alien.left < 0 or alien.right > WIDTH:

        alien.vx = -alien.vx

    if alien.top < 0 or alien.bottom > HEIGHT:

        alien.vy = -alien.vy

Here's a line art example that uses the Pygame scheduler to get custom update frequency

WIDTH, HEIGHT = 400, 400

x, y = 0, 0

def next_line():

    global x, y

    screen.draw.line((x,0), (0, HEIGHT-y), "red")

    screen.draw.line((x,HEIGHT), (WIDTH, HEIGHT-y),

                                           "blue")

    x += 10; y += 10

    if x > WIDTH or x > HEIGHT:

        clock.unschedule(next_line)

        print("done!")

clock.schedule_interval(next_line, 0.1)

A small change in the next line function can give other shapes like that to the left.

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