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