plot inside a callback
3 views (last 30 days)
Show older comments
- I started a blank GUIDE app
- Created an axes.
- Created a callback on ButtonDownFcn.
- Just added plot([0 rand], [0 rand])
function axes1_ButtonDownFcn(hObject, eventdata, handles)
plot([0 rand], [0 rand])
Then the callback is actually called only the first time I click on the axes. This happened only with plot.
Is plot hiding the axes away?
I tried also with:
plot(handles.axes1, [0 rand], [0 rand])
or with
axes(handles.axes1)
plot(handles.axes1, [0 rand], [0 rand])
but this didn't solve the problem
0 Comments
Answers (2)
David Barry
on 7 Dec 2016
I think you need to reset the callback if you plot into the axes. Try adding the line below after your plot command.
hObject.ButtonDownFcn = {@axes1_ButtonDownFcn, handles};
3 Comments
David Barry
on 7 Dec 2016
Edited: David Barry
on 7 Dec 2016
I believe it is needed. See example below where callback is reset in 2nd section. It's nothing to do with HitTest. The alternative is to set the NextPlot property on the axes to 'replacechildren' instead of default 'replace'
%%all good
a = gca;
plot(a, 1:10);
a.ButtonDownFcn = @(~,~) disp('You clicked');
a.ButtonDownFcn
%%now plot some new data and see callback is empty
plot(a, 1:20);
a.ButtonDownFcn
Walter Roberson
on 7 Dec 2016
Ah, I see what you mean. But instead,
a.NextPlot = 'replacechildren';
Walter Roberson
on 7 Dec 2016
Once the axes has something in it, then your clicks are potentially being absorbed by what is plotted in the axes rather than getting through to the axes itself.
If you are using R2014b or later, see https://www.mathworks.com/help/matlab/creating_plots/capturing-mouse-clicks.html with regards to pickableparts and hittest .
In R2014a and earlier you can still look at that, but only the hittest part existed then.
2 Comments
David Barry
on 7 Dec 2016
Edited: David Barry
on 7 Dec 2016
Incorrect. Issue is that callback is getting reset because default value for the NextPlot property on the axes is 'replace'.
Walter Roberson
on 8 Dec 2016
Edited: Walter Roberson
on 8 Dec 2016
Both issues are important when you are dealing with axes callbacks.
See Also
Categories
Find more on Interactive Control and Callbacks in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!