macbook trackpad as pen tablet

[PabloLION]

1. Mac trackpad can be used similar to a pen tablet in the built-in "handwriting" input sources. But to use it outside the input source is not easy (See MacBook Trackpad Drawing).
2. There are software like inklet and its alternatives allowing us to achieve the goal but I tried inklet and it's not working well.
3. I want to write something in swift to achieve something like this

It should:

• map a selected part of the touch pad to a dynamically selected part of o the screen
• export to svg / png
• Maybe: some gestures
• Maybe: auto correction of simple shapes like built in note

[PabloLION]

This exist in the M$ Word