data cursor mode in GUI

[EDIT: 20110722 11:46 CDT - reformat - WDR]

In normal way without any gui this works.

fig1= figure;
imshow (Photo)
dcm_obj1 = datacursormode(fig1);
cursor_info1 = getCursorInfo(dcm_obj1);
for i = 1:length(cursor_info1)
     SEL_PX(i,:)=cursor_info1(1,i).Position;
end

Now I want to implement same thing with in a gui ! I have a axes named axes_2d.

Fig1 = handles.axes_2d
imshow (photo)
% this doesnot work why ??
dcm_obj1 = datacursormode(Fig1);

it says

   ??? Error using ==> datacursormode at 138 Invalid figure handle

[Oleg Komarov]

Please format the question: http://www.mathworks.com/matlabcentral/answers/7885-tutorial-how-to-format-your-question

[Sukuchha]

Oleg, thanks for the link ! Will do that from next time !

Answer 1

[Walter Roberson]

datacursormode() must be applied to a figure, not to an axes

[Sukuchha]

Walter, could you explain a bit !

In case of GUI, whole GUI is a figure. If i have two axeses then how would i read datacursor value from those axeses.

[Walter Roberson]

If you have multiple axes in a figure, then if you are using the default information function, MATLAB will figure out which axes you are on, just the same way as it needs to figure out which line or surface or image you are on or nearby.

If you are using a custom datacursor function, the figure coordinates are going to be passed into it, and you will need to figure out yourself which axes and object you are over, in order to present relevant information (which might include no information if it not over something you want to present information on.) A useful but undocumented internal tool for this purpose is overobj()

Answer 2

[Nima Nikvand]

Hello,

Instead of

Fig1 = handles.axes_2d; 
datacursormode(Fig1);

you should apply datacursormode to the whole figure, here you are applying datacursormode to an axis, hence you get the error which says your figure handle is invalid!