70 lines
2.1 KiB
Markdown
70 lines
2.1 KiB
Markdown
|
# Etch-a-Mouse
|
||
|
|
|
||
|
|
Encoder-based mouse movement with acceleration!
|
||
|
|
|
||
|
|
## Usage
|
||
|
|
|
||
|
|
- Add the following to your rules.mk
|
||
|
|
|
||
|
|
```
|
||
|
|
ENCODER_ENABLE = yes
|
||
|
|
POINTING_DEVICE_ENABLE = yes
|
||
|
|
```
|
||
|
|
|
||
|
|
- Add the following block to your keymap.c
|
||
|
|
|
||
|
|
```
|
||
|
|
#ifdef ENCODER_ENABLE
|
||
|
|
void encoder_update_user(uint8_t index, bool clockwise) {
|
||
|
|
# ifdef POINTING_DEVICE_ENABLE
|
||
|
|
encoder_update_mouse(index, clockwise);
|
||
|
|
# endif
|
||
|
|
return;
|
||
|
|
#endif
|
||
|
|
```
|
||
|
|
|
||
|
|
> NOTE: I use the mousekey keycodes to add button one and two into my keymap.
|
||
|
|
|
||
|
|
## How It Works
|
||
|
|
|
||
|
|
> This implementation uses the pointing device library, but it reuses several
|
||
|
|
> of the same parameters from the mouse key acceleration.
|
||
|
|
|
||
|
|
> The PD library is very light weight, but it does not animate cursor movement.
|
||
|
|
> tl;dr: The mouse movement will not be smooth!
|
||
|
|
|
||
|
|
The acceleration has four parts:
|
||
|
|
|
||
|
|
```
|
||
|
|
initial speed + (delta * time * count)
|
||
|
|
```
|
||
|
|
|
||
|
|
1. **Initial Speed**. Uses the `MOUSEKEY_INITIAL_SPEED` parameter.
|
||
|
|
2. **Delta**. Uses the `MOUSEKEY_MOVE_DELTA` parameter.
|
||
|
|
3. **Time**. The faster you turn, the faster you move.
|
||
|
|
|
||
|
|
Subtract the time elapsed since the last actuation from a tapping term,
|
||
|
|
defined by `TAPPING_TERM_MOUSE_ENCODER`†, with a minimum value of 1.
|
||
|
|
|
||
|
|
4. **Count**. The more you turn, the faster you move.
|
||
|
|
|
||
|
|
Count of the total number of actuations. This value will decay over time.
|
||
|
|
|
||
|
|
† _I probably could and will eventually use `TAPPING_TERM`, but I did not want
|
||
|
|
to mess up my tap mods while experimenting with acceleration._
|
||
|
|
|
||
|
|
## Diagonal Movement
|
||
|
|
|
||
|
|
Counting the number of actuations for a given axis allows us to persist movement
|
||
|
|
along a given axis to give us some diagonal movement when moving both axes,
|
||
|
|
which also helps with the acceleration a bit and makes the movement less blocky.
|
||
|
|
|
||
|
|
## Time-based Decay (a.k.a., Deceleration)
|
||
|
|
|
||
|
|
Originally, the actuation count zeroed out once the tapping term elapsed, but
|
||
|
|
this made the movement very choppy. Instead, the count will degrade on every
|
||
|
|
refresh after the tapping term has been exceeded; unfortunately, a refresh only
|
||
|
|
occurs on an actuation on either axis, so once the time elapsed exceeds the
|
||
|
|
persistence term, the count is cleared, which also removes any movement in that
|
||
|
|
axis.
|