The "libinput analyze per-slot-delta" tool analyzes a recording made with "libinput record" and prints the delta movement per touch slot.
This is a debugging tool only, its output may change at any time. Do not rely on the output.
8 --help Print help
8 --ignore-below=<units or mm> Ignore any movement below the given threshold. The threshold is in mm if --use-mm is selected or in device units otherwise.
8 --threshold=<units or mm> Color any movement above this threshold in red. The threshold is in mm if --use-mm is selected or in device units otherwise.
8 --use-mm Print data in mm instead of device units
8 --use-st Use the single-touch ABS_X/ABS_Y instead of the multitouch axes
8 --use-absolute Print absolute coordinates, not deltas
.sf 0.000000 +0ms TOU: ++++++ | ************* | 0.021900 +21ms TOU: →↘ +1.10/+0.14 | ************* | 0.033468 +11ms TOU: →↘ +1.15/+0.19 | ************* | 0.043856 +10ms TOU: →↘ +1.76/+0.22 | ************* | 0.053237 +9ms TOU: →↘ +2.20/+0.19 | ************* |
The entry ++++++ indicates a finger has been put down, ------ indicates the finger has lifted. The left-most column is the absolute timestamp in seconds.microseconds followed by the relative time of the event to the previous event.
The word TOU in this example represents BTN_TOUCH, similar abbreviations exist for BTN_TOOL_DOUBLETAP, BTN_TOOL_TRIPLETAP, BTN_TOOL_QUADTAP, and BTN_TOOL_QUINTTAP.
The arrows indicate the approximate direction on a 16-point compass, in this example EastSouthEast.
Each multitouch slot supported by the hardware has one column, where the column shows asterisk ******** no finger is down for that slot. Where the column shows spaces only, a finger is down but no data is currently available.
In the above example, the third events occurs ~33ms into the recording, is 11ms after the previous event and has an east south-east direction. The movement for this event was x: 1.15 and y: 0.19 mm. A second finger is not currently down.