Allows control of a two engine throttle which shifts overall throttle value based on rudder input.

diff_throttle.py

import gremlin
from gremlin.user_plugin import *


# User configurable variables
mode = ModeVariable(
        "Mode",
        "The mode to use for this mapping"
)
rudder_axis = PhysicalInputVariable(
        "Rudder Axis",
        "Axis which controls rudder input",
        [gremlin.common.InputType.JoystickAxis]
)
throttle_axis = PhysicalInputVariable(
        "Throttle Axis",
        "Axis which controls throttle input",
        [gremlin.common.InputType.JoystickAxis]
)
virtual_left = VirtualInputVariable(
        "Left throttle",
        "vJoy axis mapped to the left throttle",
        [gremlin.common.InputType.JoystickAxis]
)
virtual_right = VirtualInputVariable(
        "Right throttle",
        "vJoy axis mapped to the right throttle",
        [gremlin.common.InputType.JoystickAxis]
)
invert_rudder = BoolVariable(
        "Invert rudder",
        "Whether or not the rudder directions should be inverted",
        False
)
invert_throttle = BoolVariable(
        "Invert throttle",
        "Whether or not to invert the throttle direction",
        False
)


# Device decorators
rudder_dec = rudder_axis.create_decorator(mode.value)
throttle_dec = throttle_axis.create_decorator(mode.value)


# Storage variables
total_throttle = 0.0
rudder_input = 0.0


def update_throttles(vjoy):
    left_throttle = max(-1.0, min(1.0, total_throttle + rudder_input))
    right_throttle = max(-1.0, min(1.0, total_throttle - rudder_input))

    if invert_rudder.value:
        left_throttle, right_throttle = right_throttle, left_throttle

    left_device = vjoy[virtual_left.value["device_id"]]
    left_device.axis(virtual_left.value["input_id"]).value = left_throttle

    right_device = vjoy[virtual_right.value["device_id"]]
    right_device.axis(virtual_right.value["input_id"]).value = right_throttle


@rudder_dec.axis(rudder_axis.input_id)
def rudder(event, vjoy):
    global rudder_input
    rudder_input = event.value
    update_throttles(vjoy)


@throttle_dec.axis(throttle_axis.input_id)
def throttle(event, vjoy):
    global total_throttle
    total_throttle = event.value
    if invert_throttle.value:
        total_throttle *= -1
    update_throttles(vjoy)