tft_mandelbrot.py

from ST7735 import TFT,TFTColor
from machine import SPI,Pin
spi = SPI(2, baudrate=20000000, polarity=0, phase=0, sck=Pin(14), mosi=Pin(13), miso=Pin(12))
tft=TFT(spi,16,17,18)
tft.initr()
tft.rgb(True)
tft.fill(TFT.BLACK)

minX = -2.0
maxX = 1.0
width = 128
height = 160
aspectRatio = 1.25

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

for y in range(height):
    buf = bytes()
    for x in range(width):
        c = complex(minX+x*(maxX-minX)/width, y*yScale/height-yScale/2)
        z = c
        for color in range(64):
            if abs(z) > 2:
                break
            z = z*z+c
        r, b, g = color>>4, (color>>2)&3, color & 3
        buf += TFTColor((3-r)<<5, (3-g)<<5, (3-b) << 6).to_bytes(2,'big')
    tft._setwindowloc((0,y),(127,y))
    tft.dc(1)
    tft.cs(0)
    spi.write(buf)
    tft.cs(1)
spi.deinit()

https://www.youtube.com/watch?v=DvIzWRm_HOg