scripts/android-touchpad.py

#!/usr/bin/env python3
# made for samsung galaxy note 4
# only works with stylus
# open phone app, dial *#0*#, choose “Black”
# requirements:
#  * python-libxdo
import argparse
import subprocess
from xdo import Xdo

parser = argparse.ArgumentParser(description="Use android phone stylus as input method")
parser.add_argument(
    "--pos",
    type=str,
    default="100x100+0x0",
    help="Position on phone to use in percent (e.g. 40x40+10x10)",
)
parser.add_argument(
    "--screen", type=str, default="1920x1080+0x0", help="Screen resolution and offset"
)
parser.add_argument(
    "--phone",
    type=str,
    default="12544x7056",
    help="Phone resolution (not necessarily equal to the phone’s screen resolution)",
)
args = parser.parse_args()

screen_res = tuple(map(int, args.screen.split("+")[0].split("x")))
offset = tuple(map(int, args.screen.split("+")[1].split("x")))
phone_res = tuple(map(int, args.phone.split("x")))

limits = [[0, 0], [0, 0]]
limits[0][0] = int(args.pos.split("+")[1].split("x")[0]) / 100 * phone_res[0]
limits[0][1] = (
    limits[0][0] + int(args.pos.split("+")[0].split("x")[0]) / 100 * phone_res[0]
)
limits[1][0] = int(args.pos.split("+")[1].split("x")[1]) / 100 * phone_res[1]
limits[1][1] = (
    limits[1][0] + int(args.pos.split("+")[0].split("x")[1]) / 100 * phone_res[1]
)


def real_value(axis, value):
    if axis == 1:
        value = phone_res[1] - value
    # https://stackoverflow.com/a/929107
    return int(
        ((value - limits[axis][0]) * screen_res[axis])
        / (limits[axis][1] - limits[axis][0])
    )


update = 0
x = 0
y = 0
pressure = 0

xdo = Xdo()

process = subprocess.Popen(
    ["adb", "shell", "getevent", "-q", "-l"], stdout=subprocess.PIPE
)

for line in process.stdout:
    line = line.decode("utf-8")
    line = line.split()
    if line[1] != "EV_ABS":
        continue
    event = line[2]
    value = int("0x" + line[3], 16)

    if event == "ABS_PRESSURE":
        if value == 0 and pressure != 0:
            xdo.mouse_up(0, 1)
        elif pressure == 0:
            xdo.mouse_down(0, 1)
        pressure = value

    # Y and X flipped (landscape)
    elif event == "ABS_Y":
        old_x = x
        x = real_value(0, value)
        if old_x != x:
            update += 1

    elif event == "ABS_X":
        old_y = y
        y = real_value(1, value)
        if old_y != y:
            update += 1

    if update == 2:
        update = 0
        if 0 <= x < screen_res[0] and 0 <= y < screen_res[1]:
            xdo.move_mouse(x + offset[0], y + offset[1])