circular_deadzone.py

import gremlin
import math

device = gremlin.input_devices.JoystickDecorator(
    "T.16000M",
    72331530,
    "Default"
)

# Physical axis settings
x_axis_id = 1
y_axis_id = 2

# vJoy output settings
vjoy_device_id = 1
vjoy_x_axis_id = 1
vjoy_y_axis_id = 2

# Deadzone values in [0, 1]
deadzone_inner = 0.1
deadzone_outer = 0.9


# Storage of last known axis value
x_axis_value = 0.0
y_axis_value = 0.0


def unit_direction():
    length = math.sqrt(x_axis_value**2 + y_axis_value**2)
    return (x_axis_value / length, y_axis_value / length)


def update_vjoy(vjoy):
    radius = math.sqrt(x_axis_value**2 + y_axis_value**2)
    radius = min(max(deadzone_inner, radius), deadzone_outer)
    ratio = (radius -  deadzone_inner) / (deadzone_outer - deadzone_inner)

    direction = unit_direction()
    vjoy[vjoy_device_id].axis(vjoy_x_axis_id).value = direction[0] * ratio
    vjoy[vjoy_device_id].axis(vjoy_y_axis_id).value = direction[1] * ratio


@device.axis(x_axis_id)
def x_axis(event, vjoy):
    global x_axis_value
    x_axis_value = event.value
    update_vjoy(vjoy)

@device.axis(y_axis_id)
def y_axis(event, vjoy):
    global y_axis_value
    y_axis_value = event.value
    update_vjoy(vjoy)