Mapping Mouse Move to a GamePad Stick

[luttje]

To play games that support controllers, with mouse and keyboard, you can map your mouse movement to the right gamepad stick. In most games this will allow you to look around. However there are some caveats to consider:

• Most games will accept mouse input and gamepad input at the same time (you should override mouse movement)
• Some games move your mouse to a corner when they detect a gamepad (this can mess with how Key2Joy detects movement)

We'll discuss the problem and solution below.

Mapping Setup

In this setup we've reduced the sensitivity by setting the delta scale to 0.1 for X movement and -0.1 for Y movement. The stick also resets to it's 0,0 position after 50 milliseconds. This feels better than constantly following the mouse around.

Block default mouse movement

In order to only let the simulated GamePad stick movement arrive at the game (and not the mouse movement as well), you should enable these configurations in Tools > User Configurations:

Reset the center after the game has started

In most games when you start, the cursor will be moved somewhere on the screen. This causes the following problem in Key2Joy:

1. You arm the mapping
2. The cursor is locked to it's current position (e.g: 100, 100). That is set by Key2Joy as the center.
3. If you move (e.g: to 105, 105) Key2Joy knows to move the stick accordingly (e.g: by +5, +5)
4. You open the game
5. The game detects a gamepad and moves your cursor to 0, 0
6. You move (e.g: by +5, +5), but now Key2Joy thinks you moved a lot (e.g: from 100, 100 to 5, 5) causing your character to spin around wildly.

To fix this we need to be able to re-center the cursor once in-game. For that we can setup the following action (which we've bound to L):

With this ResetMouseMoveTriggerCenter App Command configured, you can fix Key2Joy after step 5 above and press 'L' while in-game. This will nullify the center. You should then give you mouse the smallest move, so whatever position it is at right now is registered as the new center.

🐛 Notes on this behavior

I'm looking for ways to make this more intuitive and less work for you, the user. I'm progress on that in this issue: #64