Massive slow down in mouseclick behaviour in APPDESIGNER compared to GUIDE

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Jason 2020-2-20

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https://ww2.mathworks.cn/matlabcentral/answers/506637-massive-slow-down-in-mouseclick-behaviour-in-appdesigner-compared-to-guide

评论： Jason 2020-2-25

Hello. I am observing quite a difference in beahviour between GUIDE and appdesigner.

I have an image that I have created a mouseclick callback which once the image has been displaye din an axes component allows the user to click - this then records the click postion on the image and calculates a mean of a small area around this position.

In GUIDE I Do this:

    %Ensure x & y are integers (i.e. represent pixels)
    x=round(curX);    %Cur X is the current mouseclick x position
    y=round(curY);    %Cur Y is the current mouseclick y position
    setappdata(0,'curX',x);   %Save for later use
    setappdata(0,'curY',y);   %Save for later use
    hold on
    plot(x,y,'r+','MarkerSize',15,'LineWidth',1)   %Display on image where user has clicked.
    hold off;
    refresh 
    %Get Zoomed in image
    IMG =double( getimage(handles.axes1));         %Get image data
    delta=100;                                     %Halfwidth of ROI region to get mean on 
     ROI = IMG(y-delta:y+delta, x-delta:x+delta,:);%Get the ROI
     mm=mean2(ROI);                                %Perfrom the mean 
     
     %Displat ROI rectangle and text of mean on the image
     hold on
     rectangle('Position',[x-delta y-delta 2*delta 2*delta], 'EdgeColor','y','LineWidth',0.5);  
     text(x,y-delta-45,num2str(mm,'%.1f'),'FontSize',10,'Color','r', 'HorizontalAlignment','center')
     hold off
     

This occurs almost instantly, say <0.25s

When I have tried to do this using APPDESIGNER, the plotting of the point with a marker is quick, however the calculation of the mean of the ROI and drawing of the rectangle with text is very slow. In all it takes about 2s. I cannot figure out wht it takes so much longer.

                   z=app.UIAxes.CurrentPoint;
                   x=round(z(1,1));  y=round(z(1,2));
                   hold(app.UIAxes,'on');
                   plot(app.UIAxes,x,y,'b*'); drawnow
                   
                   I=getimage(app.UIAxes);              
                   Intensity=I(y,x);    %Intensity of image at point x,y
                   %Now get mean of square region centred on x,y 
                   delta=100;
                   ROI = I(y-delta:y+delta, x-delta:x+delta,:);
                   mn=mean(ROI(:));    %Have also tried mean2(ROI) - but no better
                   rectangle(app.UIAxes,'Position',[x-delta y-delta 2*delta 2*delta], 'EdgeColor','y','LineWidth',0.5); 
                   text(app.UIAxes,x,y-delta-45,num2str(mn,'%.1f'),'FontSize',12,'Color','r', 'HorizontalAlignment','center');
                   hold(app.UIAxes,'off');

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Jason 2020-2-25

编辑：Jason 2020-2-25

在 MATLAB Online 中打开

So in an attempt to find out where the problem is, I have used tic & toc

        function ImageButtonDownCallback(app, source, eventargs)     
                   %profile on 
                   disp('----timing-----')
                  tic
                   delete(findobj(app.UIAxes, 'Marker', '*')); %Delete previous marker
                   delete(findobj(app.UIAxes, 'Type','rectangle')); %Delete previous rectangler
                   delete(findobj(app.UIAxes, 'Type','text')); %Delete previous text
                   z=app.UIAxes.CurrentPoint;
                   x=round(z(1,1));  y=round(z(1,2));
                   hold(app.UIAxes,'on');
                   plot(app.UIAxes,x,y,'b*'); 
                   drawnow                   
                   app.xy=[x,y];
                   
                   I=getimage(app.UIAxes);   
                   
                   Intensity=I(y,x);
                   ReportMessage(app,['x=',sprintf('%.0f',x),', y=',sprintf('%.0f',y),' Intensity=',sprintf('%.0f',Intensity)]);
                   %Now get mean of square region centred on x,y 
                   delta=100;
                   ROI = I(y-delta:y+delta, x-delta:x+delta,:);
                   mn=mean(ROI(:));
                   
                   %mn=getMeanOfROI(app,I,x,y,delta);
                   rectangle(app.UIAxes,'Position',[x-delta y-delta 2*delta 2*delta], 'EdgeColor','y','LineWidth',0.5); 
                   text(app.UIAxes,x,y-delta-45,num2str(mn,'%.1f'),'FontSize',12,'Color','r', 'HorizontalAlignment','center');
                  toc
                   hold(app.UIAxes,'off');drawnow
                  toc
                  

and here are the values.

----timing-----
Elapsed time is 0.537646 seconds.
Elapsed time is 2.075554 seconds.

So 1.5s just to do the last line

hold(app.UIAxes,'off');drawnow

Adam 2020-2-25

Yeah, draw now can be very slow, depending what is in the figure. I haven't used appdesigner much, but when I did it does seem generally slower than GUIDE, to first launch the UI at least, which is a lot down to drawing it so it doesn't surprise me if this is quicker from a GUIDE GUI.

Jason 2020-2-25

But the first drawnow seems to be OK

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Massive slow down in mouseclick behaviour in APPDESIGNER compared to GUIDE

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Massive slow down in mouseclick behaviour in APPDESIGNER compared to GUIDE

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