1. Overview & Core Concept vJoy is an open-source virtual joystick driver for Windows. It creates a software-emulated game controller that any application (game, simulator, tuning software) recognizes as a physical USB device.
uses this virtual device to convert your mouse’s 2D movement (X/Y axes) into analog steering input—typically the X-axis of the virtual joystick. This allows for far greater precision than keyboard steering (binary on/off) and offers a low-cost alternative to a wheel. 2. Required Components | Component | Purpose | |-----------|---------| | vJoy | Creates the virtual joystick | | FreePIE (Programmable Input Emulator) or JoyToKey / Feeder | Reads mouse movement and maps it to vJoy axes | | Game | Must support joystick/gamepad input for steering | vjoy mouse steering
if starting: mouse.position = (screen_width/2, 500) # center mouse update() every(0.016, update) uses this virtual device to convert your mouse’s
def update(): # Get screen width (adjust multiplier for sensitivity) screen_width = 1920.0 # Read mouse X position in pixels mouse_x = mouse.position.x # Map 0..screen_width to -32768..+32767 (vJoy range) vjoy_value = (mouse_x / screen_width) * 65535 - 32768 # Clamp to valid range vjoy_value = max(-32768, min(vjoy_value, 32767)) vjoy[1].x = int(vjoy_value) 500) # center mouse update() every(0.016
# Mouse steering with vJoy - Absolute positioning # Center mouse to center steering, move left/right for full lock from system import * from mouse import * from vjoy import *
For relative mouse movement (like a steering wheel's returning center):
# Relative mode - each mouse movement adds/subtracts steering sensitivity = 15 # pixels per 1000 vJoy units steering = 0 def update(): global steering dx = mouse.delta.x steering += dx * sensitivity steering = max(-32768, min(steering, 32767)) vjoy[1].x = int(steering)
