Hi folks,

I am planning to re-write a data viewer program I wrote ages ago using C + Xlib.

This program allows me to plot on the same window several graphs (time
versus brightness - I work on variable stars).  They all share the
same independent variable (time passes the same for everybody).

I can scroll and zoom the graphs both in X and Y.  When I scroll/zoom
in X all plots suffer the same action.  Y scrolling/zooming may be
done for each plot.

Now the question: I need a data cursor, by that I mean some marker
that sits on top of a point and which may be moved forward/backward by
pressing a key.  Matplotlib has a mouse cursor that gives me the
cursor coordinates, but it doesn't

- sit on top of my points and therefore doesn't give me the exact
value of that point
- allow me to move from one point to the next
- allow me to change which graph I want the cursor sitting on

I thought of drawing my own cursor, deleting it and moving to the next
point . It seems this would take forever as (far as I understand)
matplotlib will redo the entire plot each time I do this.

How hard is it for the developers to include a built in data cursor in
a similar fashion to the mouse cursor now available.  I am affraid
this isn't too easy, I don't know any plotting program that has one
like what I need.

thanks for your attention,

Antonio Kanaan

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