waitbar cancel doesn't work

First of all it seems that this is common issue. I read all the topics I could find on the forum here, but there was no clear answer.

Adding drawnow didn't work.

And, Yes, the function is interruptible.

f = waitbar(0,'Loading','Name','Exporting...',...
    'CreateCancelBtn','setappdata(gcbf,''canceling'',0)');


for k = 1:16
    
    if getappdata(f,'canceling') == 1
        break
    end
    
    figure('Visible', 'off');
    
    ExpFig = trisurf(F,P(:,1),P(:,2),P(:,3),app.UITable4.Data(:,k));
    
        
    exportgraphics(gcf, string(file) ,"BackgroundColor","none","ContentType","vector","Append",true);
    
    close;
    
    
    waitbar(k/16, f, sprintf('Export Progress: %d %%', floor (k/16*100)));
    pause(0.1);
    drawnow();
    
end
delete (f);
msgbox('Export Completed!');

Answer 1

[Rik]

You forgot to set the value first and you reversed 0 and 1:

f = waitbar(0,'Loading','Name','Exporting...',...
    'CreateCancelBtn','setappdata(gcbf,''canceling'',1)');
setappdata(f,'canceling',0);

for k = 1:16
    
    if getappdata(f,'canceling')
        break
    end
    
    figure('Visible', 'off');
    
    ExpFig = trisurf(F,P(:,1),P(:,2),P(:,3),app.UITable4.Data(:,k));
    
        
    exportgraphics(gcf, string(file) ,"BackgroundColor","none","ContentType","vector","Append",true);
    
    close;
    
    
    waitbar(k/16, f, sprintf('Export Progress: %d %%', floor (k/16*100)));
    pause(0.1);
    drawnow();
    
end
delete (f);
msgbox('Export Completed!');

[Pelajar UM]

Thanks, but this doesn't work. The loop only goes through k=1 and then it cancels the rest on its own.

[Rik]

You could try using explicit handles:

h_f=figure('Visible', 'off');
ExpFig = trisurf(...
    F,...
    P(:,1),P(:,2),P(:,3),...
    app.UITable4.Data(:,k),...
    'Parent',h_f);
exportgraphics(h_f, string(file) ,"BackgroundColor","none","ContentType","vector","Append",true);
close(h_f);

If that doesn't help, try with a visible figure and step through your code line by line.

[Pelajar UM]

Getting this error :(

Error using trisurf
Patch cannot be a child of Figure.

Also I must add that in my original code, all the frames (1:16) are exported. It's just that the cancel button doesn't do anything.

[Rik]

Ah, I always forget this: you need to create an axes object first:

h_f=figure('Visible', 'off');
h_ax=axes('Parent',h_f);
ExpFig = trisurf(...
    F,...
    P(:,1),P(:,2),P(:,3),...
    app.UITable4.Data(:,k),...
    'Parent',h_ax);
exportgraphics(h_f, string(file) ,"BackgroundColor","none","ContentType","vector","Append",true);
close(h_f);

[Pelajar UM]

While the answer from VBBV works, it seems like you cannot get rid of uifigure. Your last comment did the job. So the accepted answer goes to you! :)

[Rik]

You're welcome