python/pyxel/examples/99_flip_animation.py

import pyxel

phase = 0.0

pyxel.init(128, 128, title="Flip Animation")

while True:
    if pyxel.btnp(pyxel.KEY_Q):
        pyxel.quit()

    pyxel.cls(1)

    for x in range(0, 128, 4):
        for y in range(0, 128, 4):
            dist = pyxel.sqrt((x - 64) ** 2 + (y - 64) ** 2)
            offset_x = pyxel.sin(dist * 20 + phase) * 2.5
            offset_y = pyxel.sin(offset_x * 25) * 2.5
            color = int((15 - dist * 0.2) % 16)
            pyxel.circ(x + offset_x, y + offset_y, 1, color)

    phase += 360 / 30

    pyxel.flip()
    # Please note that flip function only works on non-Web platforms