Save axes properties/data and load it on an other axes

Hello everyone,

I am currently working on a gui, in which among other things, i uses the google map API (via this function http://www.mathworks.com/matlabcentral/fileexchange/24113) and I have created several pushbutton allowing the user to modify the axes properties (zoom/pan...).

Now, because this API is supposed to be used on field tests, i need it to be able to work without an internet connection, and to do so i want the user to be able to save some maps beforehand, and load them when needed to. At first i thought that saving the XData/YData/CData of the figure would be enough, but it seems that it doesnt. I started with :

function saveMap_Callback(hObject, eventdata, handles)
children = findall(handles.axes1.Children, 'Tag', 'gmap');
XData = children(end).XData;
YData = children(end).YData;
CData = children(end).CData;
...
save(file, 'map');

But when i then try to load this and plot it with image(XData, YData, CData), it doesn't reproduce the same image, as the zoom properties are not 'stored' into the image data.

I then tried to also save the XLim and YLim of the axes, and only keep the corresponding part of the image :

limX = get(handles.axes1, 'XLim');
limY = get(handles.axes1, 'YLim');
mapX = (XData>limX(1)).*(XData < limX(2));
map.XData = XData(logical(mapX));
mapY = (YData>limY(1)).*(YData < limY(2));
map.YData = YData(logical(mapY));
map.limX = [map.XData(1) map.XData(end)] ;
map.limY = [map.YData(1) map.YData(end)];
map.CData(:,:,:) = CData(find(mapX,1, 'first'):find(mapX,1,'last'), find(mapY,1, 'first'):find(mapY,1,'last'), :) ;

Now the result is closer than what I want, but when i load the corresponding picture, the aspect ratio is clearly modified, and the picture is oddly stretched, even when i set the older XLim and YLim properties on the new axes.

The last step i wanted to do what to store the axes properties :

prop = get(handles.axes1)

And then, when i load the image, use it on my new axis :

image(XData, YData, CData);
set(handles.axes1, prop)

However, it triggers a bunch of errors as lots of the axes properties (CurrentPoint, etc...) are read-only ready.

So my questions are the following :

• Is it possible to get only the non-read-only properties of the axes and use for another axes ?
• Or even, is there better way to do what i want to do that i did not think of ?

Cheers, Lilian

Answer 1

[Walter Roberson]

modifiiable_axes_fields_names = fieldnames( set(handles.axes1) );

[Lilian Darracq]

Looks like the trick indeed, one last question though !

When i do this, some of the corresponding fields are empty, and thus i get some errors if i try to use it as new properties for my axes.

I am not entirely familiar with struct and structfun, but i am trying to do something like :

propTemp = set(handles.axes1);
prop = propTemp(~structfun(@isempty, propTemp))

However, structfun(@isempty, propTemp) is a logical array, so propTemp(~structfun(@isempty, propTemp)) throws an error.

How can i use this logical array to remove the empty fields in propTemp ?

Thanks a lot !!

[Walter Roberson]

rmfield() can take a cell array of character vectors.

... But personally if I had a saved axes structure, then I would just copyobj() it, and then make whatever changes were appropriate to the copy (e.g., different Position)