Axes handles
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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
回答（1 个）
Robert Cumming
2011-8-4
0 个投票
The image will be a child of the axes, so you can get it through the children field of the axes handle.
8 个评论
Walter Roberson
2011-8-4
e.g., findobj(TheAxesHandle,'type','image')
Robert Cumming
2011-8-4
exactly
Patrick Kalita
2011-8-4
If performance is a concern, using appdata is probably better than using findobj.
Jan
2011-8-4
@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
2011-8-4
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
2011-8-5
Walter Roberson
2011-8-5
Already did, in the first comment. Repeating it: findobj(TheAxesHandle,'type','image')
Jason
2011-8-5
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