Axes handles

Is it possible to access an image that has been assigned to an axes handle on a GUI. I usually use read an image and preassign it using setappdata and then retrieve it using getappdata later. It occured to me that the handles structure must be holding the image somewhere so can I just access this instead?

an example being if I want to rotate an image after it has loaded into the axes component

Thanks Jason

Answer 1

[Robert Cumming]

The image will be a child of the axes, so you can get it through the children field of the axes handle.

[Walter Roberson]

e.g., findobj(TheAxesHandle,'type','image')

[Robert Cumming]

exactly

[Patrick Kalita]

If performance is a concern, using appdata is probably better than using findobj.

[Jan]

@Patrick: FINDOBJ can be very slow, if a large number of handles and their children is searched. If you search just a single child of an axes with known handle, FINDOBJ is as fast as getting the application data for the figure handle.

[Walter Roberson]

findobj() has the advantage of not relying upon the image being a _direct_ child of the axes -- e.g., it might be a child of a hgtransform .

[Jason]

could someone give me an example please of using FindObj?

Thanks

[Walter Roberson]

Already did, in the first comment. Repeating it: findobj(TheAxesHandle,'type','image')

[Jason]

Thankyou.