Re: creating interactive Qt plots

[mmuetzel]

Andreas Weber-6 wrote
> Dear all,
> ich wanted to add some examples to the wiki which shows how to interact
> with plots using callbacks.
> 
> The idea was to have a triangle and enables the user to drag the corners
> around (code follows at the bottom)
> 
> https://josoansi.de/files/vokoscreen-2017-12-31_08-17-43.mp4
> 
> My first surprise was that the marker and lines have (now?) their own
> callback and the figure callback isn't triggered when a line or a marker
> is clicked even when there is no callback for the line/marker.

Hi Andy,

this Mathwork's page gives a good overview of the "PickableParts" and
"HitTest" properties. So what you are describing is the correct behaviour as
long as you leave these properties to their default. That said, I haven't
checked whether these properties work the same in Octave.

Guten Rutsch
Markus

PS: I like your example code. Maybe you could add some logic to prevent
concurrent execution of "drag_fig" (like setting a persistent variable to
true while the callback is running). I found that this is necessary in
Matlab when a function might be called from different callbacks (the
"buttondownfcn" and the "windowbuttonmotionfcn" in your second variant). I
don't know how "forgiving" Octave is in this respect.



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