36 lines
1.4 KiB
Markdown
36 lines
1.4 KiB
Markdown
## Digitizer
|
|
|
|
The digitizer HID interface allows setting the mouse cursor position at absolute coordinates, unlike the Pointing Device feature that applies relative displacements.
|
|
|
|
To enable the digitizer interface, add the following line to your rules.mk:
|
|
|
|
```make
|
|
DIGITIZER_ENABLE = yes
|
|
```
|
|
|
|
In order to change the mouse cursor position from your keymap.c file, include the digitizer header :
|
|
|
|
```c
|
|
#include "digitizer.h"
|
|
```
|
|
|
|
This gives you access to the `digitizer` structure which members allow you to change the cursor position.
|
|
|
|
The coordinates are normalized, meaning there value must be set between 0 and 1. For the `x` coordinate, the value `0` is the leftmost position, whereas the value `1` is the rightmost position.
|
|
For the `y` coordinate, `0` is at the top and `1` at the bottom.
|
|
|
|
Here is an example setting the cursor in the middle of the screen:
|
|
|
|
```c
|
|
digitizer_t digitizer;
|
|
digitizer.x = 0.5;
|
|
digitizer.y = 0.5;
|
|
digitizer.tipswitch = 0;
|
|
digitizer.inrange = 1;
|
|
digitizer_set_report(digitizer);
|
|
```
|
|
|
|
The `tipswitch` member triggers what equates to a click when set to `1`. The `inrange` member is required for the change in coordinates to be taken. It can then be set to `0` in a new report to signal the end of the digitizer interaction, but it is not strictly required.
|
|
|
|
Once all members are set to the desired value, the `status` member needs its bitmask `DZ_UPDATED` to be set so the report is sent during the next main loop iteration.
|