mandelbrot.py

import gpu, framebuf
gpu.fb_init(240, 135, screen_w=1920, screen_h=1080)
fb = framebuf.FrameBuffer(gpu.fb_data(), 240, 135, framebuf.RGB565)
fb.fill_rect(0,0,240,135,0)

minX = -2.0
maxX = 1.0
width = 240
height = 135
aspectRatio = 1.0

yScale = (maxX - minX) * (float(height) / width) * aspectRatio

for y in range(height):
    for x in range(width):
        c = complex(minX + x * (maxX - minX) / width, y * yScale / height - yScale / 2)
        z = c
        for color in range(512):
            if abs(z) > 2:
                break
            z = z * z + c
        color = ~color & 0x1ff
        r, g, b = (color & 0x1a) << 7, (color & 0x38) << 3, (color & 0x7) << 2
        fb.pixel(x, y, r | g | b)