1  """
 2  Simple painting demo that draws on an Adafruit capacitive touch shield with
 3  ILI9341 display and STMPE610 resistive touch driver
 4  """
 5  
 6  import busio
 7  import board
 8  import digitalio
 9  import adafruit_stmpe610
10  from adafruit_rgb_display import ili9341, color565
11  
12  # Create library object using our Bus SPI port
13  spi = busio.SPI(clock=board.SCK, MOSI=board.MOSI, MISO=board.MISO)
14  
15  # Adafruit Metro M0 + 2.8" Capacitive touch shield
16  cs_pin = digitalio.DigitalInOut(board.D9)
17  dc_pin = digitalio.DigitalInOut(board.D10)
18  
19  # Initialize display
20  display = ili9341.ILI9341(spi, cs=cs_pin, dc=dc_pin)
21  # Fill with black!
22  display.fill(color565(0, 0, 0))
23  
24  st_cs_pin = digitalio.DigitalInOut(board.D6)
25  st = adafruit_stmpe610.Adafruit_STMPE610_SPI(spi, st_cs_pin)
26  
27  while True:
28      if st.touched:
29          while not st.buffer_empty:
30              ts = st.touches
31              for point in ts:
32                  # perform transformation to get into display coordinate system!
33                  y = point["y"]
34                  x = 4096 - point["x"]
35                  x = 2 * x // 30
36                  y = 8 * y // 90
37                  display.fill_rectangle(x - 2, y - 2, 4, 4, color565(255, 0, 0))