Programming Pygame Zero to make images move and play sounds

Pygame Zero can be installed using pip, the Python package installer. Open a terminal window (in VSCode, or the program cmd on Windows or Terminal on Mac). Type "pip install pgzero".

To run Pygame Zero code, use the command "pgzrun" in the terminal, rather than the usual "python" command.

Pygame Zero opens a window and draws a circle:

# size of the window that opens
WIDTH = 800
HEIGHT = 600
# this function is called 60 times per second
def draw():
   screen.clear()
   screen.draw.circle((400, 300), 30, 'white')

Pygame Zero draws eyes that follow the mouse:

import math
import pygame
WIDTH = 600
HEIGHT = 600
def update():
   pass
def draw():
   screen.fill((0, 0, 0))
   def draw_eye(eye_x, eye_y):
       mouse_x, mouse_y = pygame.mouse.get_pos()
       screen.draw.text('x: ' + str(mouse_x)+ '\n' + 'y: ' + str(mouse_y),(0, 0))
       distance_x = mouse_x - eye_x
       distance_y = mouse_y - eye_y
       distance = min(math.sqrt(distance_x**2 + distance_y**2), 30)
       angle = math.atan2(distance_y, distance_x)
       pupil_x = eye_x + (math.cos(angle) * distance)
       pupil_y = eye_y + (math.sin(angle) * distance)
       screen.draw.filled_circle((eye_x, eye_y), 50, color=(255, 255, 255))
       screen.draw.filled_circle((pupil_x, pupil_y), 15, color=(0, 0, 100))
   draw_eye(WIDTH/3, HEIGHT/2)
   draw_eye(WIDTH*2/3, HEIGHT/2)

Pygame Zero draw the mouse position as text:

import pygame
import math
WIDTH = 600
HEIGHT = 600
def update():
   pass
def draw():
   screen.fill((0, 0, 0))
   def draw_mouse(x,y):
       screen.draw.text('x: ' + str(x)+ '\n' + 'y: ' + str(y),(0, 0))
       screen.draw.filled_circle((x, y), 10, color=(255, 0, 0))
   mouse_x, mouse_y = pygame.mouse.get_pos()
   draw_mouse(mouse_x, mouse_y)

Pygame Zero Piano:

WIDTH = 400
HEIGHT = 300
beep_a = tone.create('E3', 0.1)
beep_s = tone.create('D3', 0.1)
beep_d = tone.create('C3', 0.1)
# this function is called when a keyboard key is pressed down
def on_key_down(key):
   if key == keys.A:
       beep_a.play()
   if key == keys.S:
       beep_s.play()
   if key == keys.D:
       beep_d.play()
def draw():
   screen.fill((0, 0, 0)) # a black background, (red, green, blue)

Pygame Zero open a serial port and draw the number received (use "pip install pyserial" to get the serial package):

import serial
ser = serial.Serial('/dev/tty.usbmodem1101') # the name of your port here
print('Opening port: ' + str(ser.name))
import pygame
WIDTH = 600
HEIGHT = 600
n1_int = 0
n2_int = 0
def update():
   n_bytes = ser.readline() # read all the letters available
   s = str(n_bytes) # turn them into a str
   result1 = s[s.find('(')+1:s.find(',')] # find everything beween ( and ,
   result2 = s[s.find(',')+1:s.find(')')] # find everything between , and )
   global n1_int
   n1_int = int(result1) # convert str to int
   global n2_int
   n2_int = int(result2)
def draw():
   screen.fill((0, 0, 0))
   screen.draw.text('a0: ' + str(n1_int)+ '\n' + 'a1: ' + str(n2_int),(0, 0))

and the code that would run on the Pico to send the data:

import time # for time.sleep()
import board # for pin names
import analogio # for adc

a0 = analogio.AnalogIn(board.A0) # read the voltage on A0
a1 = analogio.AnalogIn(board.A1) # read the voltage on A1

while 1:
    print("("+str(a0.value)+","+str(a1.value)+")")
    time.sleep(1/30) # print out 30 times per second