Zooming resizes axes

Dear all,

I am working on my first GUI and already [edited] beginning to love it [until here] :-) I am not managing it to obtain stable axes. Here is my code [now edited again, sorry].

Take this as input:

[X,Y] = meshgrid(1:200,1:100);
A = [peaks(100) peaks(100)];

This is the function:

function [] = mygui(X,Y,A)

% place data in structure array so that it is available to each subfunction
S.data.X = X;
S.data.Y = Y;
S.data.A = A;

% set up figure
S.fh = figure('units','pixels',...
              'position',[100 100 800 600],...
              'menubar','none',...
              'name','Manual carving tool',...
              'numbertitle','off',...
              'resize','off',...
              'toolbar','figure');

% set up zoom toolbar
S.tbh  = findall(S.fh,'Type','uitoolbar');  
S.tbhb = findall(S.tbh);
delete(S.tbhb([2:9 13:end]));
S.tbhb = S.tbhb(10:12);

% axes
S.ax = axes('parent',S.fh,...
            'Units','pixels',...
            'DataAspectRatio',[1 1 1],...
            'DataAspectRatioMode','manual',...           
            'OuterPosition',[0 0 600 600],...
            'Position',[0 0 600 600],...
            'Xlimmode','auto',...
            'Ylimmode','auto',...
            'PlotBoxAspectRatio',[1 1 1],...
            'PlotBoxAspectRatioMode','manual',...
            'Visible','on',...
            'Layer','top',...
            'Box','on',...
            'Visible','on');

% display A in axes
S.im = image('parent',S.ax,...
             'XData',X(1,:),...
             'YData',Y(:,1),...
             'CData',A,...
             'CDataMapping','scaled',...
             'visible','on');

So if I now zoom in, the axes position remains at [0 0 600 600], then, if I zoom out and the image extent becomes smaller than the axes, the axes tighten around the image. If I doubleclick on the image, the original position of the axes appears again. However, I would like the axes to remain at the same position always, disregarding the "zoom history". I am using R2011b on Windows.

Thanks for your help, Anon

[Sean de Wolski]

+1 too. Well written question and interesting way of keeping the zoom options.

Perhaps your GUI would behave better if you quit hating it and started being nice to it. You catch more flies with honey than vinegar :)

[Anon]

Thanks, Sean! I have edited the example a little and it should run now. Just use

[X,Y,A] = peaks(100);

as input.

[Sean de Wolski]

You're welcome!

I'm now not clear on what behavior you want: I'll list what I'm seeing for you to comment on what's good/bad:

1) image is in bottom left corner taking up 5/6 of axes in x/y

2) try to zoom out, can't.

3) zoom in on area complete contained within the image. Image takes up whole axes.

4) pan to edge of image - no white on the outside, can't leave image range.

5) zoom out able to stop at image covering whole axes or back to original 5/6

6) zoom in on edge of image, half stays off image half stay on, ablt to pan onto axes with no image. If I pan on to image completely can't pan back to axes.

What part don't you like (or am I not trying?)

[Anon]

I hope the following pictures allow me to get a bit clearer. I have taken the peaks example from my first post which is

[X,Y] = meshgrid(1:200,1:100);

A = [peaks(100) peaks(100)];

and not a quadratic example

1) Calling the GUI

http://img31.imageshack.us/img31/2355/83762790.jpg

2) Zoom in

http://img534.imageshack.us/img534/862/88891339.jpg

3) Zoom out (twice). The axes are tight around the image, what I don't want.

http://img716.imageshack.us/img716/4573/86769480.jpg

4) Double clicking brings back the original layout, which is good.

http://img823.imageshack.us/img823/6725/58997684.jpg

Thanks for your help!

[Sean de Wolski]

See my updated answer.

Answer 1

[Sean de Wolski]

UPDATE Add this to the bottom of your mfile:

%Setup         
set(S.ax,'ylimmode','auto','xlimmode','auto'); %reset after image detroyed
h = zoom(S.ax); %build zoom object
zoom reset; %store current setting
set(h,'ActionPostCallback',{@mypostcallback,h}); %set callback

function mypostcallback(~,~,h) 

zdir = get(h); get the handle
if(strcmp(zdir.Direction,'out')) %is it going out?
    set(h,'ActionPostCallback',[]); %disable the call back to zoom out
    zoom('out'); %zoom to original spot
    set(h,'ActionPostCallback',{@mypostcallback,h}); %re-enable the callback
end

[Anon]

No I haven't. But now I did though I am not really getting much wiser. I created a post-callback which sets the axes position back to its original position. But that doesn't have any effect...

S.zh = zoom(S.fh);

set(S.zh,'ActionPostCallback',{@mypostcallback,S});

and

function mypostcallback(varargin)

S = varargin{3};

set(S.ax,'Position',[0 0 600 600],'PlotBoxAspectRatio',[1 1 1]);

end

[Anon]

Thanks, Sean, for your support.

This works fine! The only drawback is, that you zoom out completely, when zooming out. But that's fine with me.

Answer 2

[karan]

You really dont need any code for what you are asking. If you want to get what you are asking use the matlab GUIDE.

when you are in your figure file section of your gui...on the top just to the left of the 'm-file editor' there is the 'toolbar editor' go there and add the zooming buttons ... this automatically comes up when u run your gui moreover it resizes te axes itself everytime you zoom in or zoom out.

 check out this video and you will know what i am talking about...

i hope this helps

http://blogs.mathworks.com/videos/2008/07/22/matlab-basics-adding-a-toolbar-to-a-gui/

[Anon]

The toolbar is not the issue, but the way the axes respond to zooming. Did you read my question? In addition, there is more in the GUI than what I have shown here. And this requires coding.