pimoroni-pico/micropython/examples/pico_display/balls_demo.py

import time
import random
from picographics import PicoGraphics, DISPLAY_PICO_DISPLAY, PEN_P8

display = PicoGraphics(display=DISPLAY_PICO_DISPLAY, pen_type=PEN_P8)
display.set_backlight(1.0)

WIDTH, HEIGHT = display.get_bounds()

# We're creating 100 balls with their own individual colour and 1 BG colour
# for a total of 101 colours, which will all fit in the custom 256 entry palette!


class Ball:
    def __init__(self, x, y, r, dx, dy, pen):
        self.x = x
        self.y = y
        self.r = r
        self.dx = dx
        self.dy = dy
        self.pen = pen


# initialise shapes
balls = []
for i in range(0, 100):
    r = random.randint(0, 10) + 3
    balls.append(
        Ball(
            random.randint(r, r + (WIDTH - 2 * r)),
            random.randint(r, r + (HEIGHT - 2 * r)),
            r,
            (14 - r) / 2,
            (14 - r) / 2,
            display.create_pen(random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)),
        )
    )

BG = display.create_pen(40, 40, 40)

while True:
    display.set_pen(BG)
    display.clear()

    for ball in balls:
        ball.x += ball.dx
        ball.y += ball.dy

        xmax = WIDTH - ball.r
        xmin = ball.r
        ymax = HEIGHT - ball.r
        ymin = ball.r

        if ball.x < xmin or ball.x > xmax:
            ball.dx *= -1

        if ball.y < ymin or ball.y > ymax:
            ball.dy *= -1

        display.set_pen(ball.pen)
        display.circle(int(ball.x), int(ball.y), int(ball.r))

    display.update()
    time.sleep(0.01)