Compared with the mouse, TrackPoint little red dot lacks a little flexibility, but compared with the touchpad that comes with the notebook, little red dot is more flexible and accurate, because the touchpad is not very convenient to operate, especially when the moving distance is very small, and it cannot achieve fine results.
Extended data:
When you press TrackPoint, the harder the key, the faster the cursor moves. You can pay attention to the movement process of the pointer, and you will find that at the moment when the finger of the pointer stops leaving the pointing stick, the pointer will retreat a little in the opposite direction.
This is because, although the intention is to release the pointing stick at the target position, people's reaction is always prone to a little delay; At the same time, there will be a little time difference when the pointing stick itself returns to the upright state. Therefore, if it is designed to respond completely faithfully to the pressure exerted on the pointing stick, the pointer will slightly exceed the destination.
To prevent this, TrackPoint is designed to deliberately move the pointer back a little before the state of applying pressure stops. Thanks to this subtle control, the user will not feel the operation error at all, but will feel that the pointer has stopped at the right position.
This is the patented transfer function and algorithm of TrackPoint controller successfully researched by IBM, which can make the cursor move too fast without losing the positioning accuracy in the process of fast movement.
References:
Baidu encyclopedia-tracking point