[Octave-patch-tracker] [patch #9280] Add data cursor functionality in plots

[Reik Red]

Follow-up Comment #16, patch #9280 (project octave):

Good stuff! I have some comments and questions:

1. datacursor cannot be moved/adjusted/deleted after initial placement? Would
like to be able to unstick and move and delete. Need this fairly badly.

2. there is no way to add a user-defined function to display data values in a
different format, e.g. as YYYY-MM-DD using datestr()? Note that <nrjank>
comment1 below hints at some such matlab functionality that would be
desirable, namely the UpdateFcn — Callback function that formats data tip
text. Really need this.

For a concrete example off how matlab can do this, see
https://www.mathworks.com/matlabcentral/answers/117068-how-can-i-view-the-formatted-date-string-datestr-while-using-date-cursor-for-a-plot-containing-date

3. datacursor does not react to a changing zoom level, but rather stays in a
fixed position on the canvas? This is maybe a bit tricky to fix, but "would be
nice".

4. Could we get just a few lines of a manual to explain what each mouse button
is supposed to do, etc)?


Thanks, datacursor is a very useful addition to Octave.

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