Problem using imcrop in App Designer(2019a Version)

I've been trying to get imcrop function to work directly on a specified set of UIAXES in app designer. I have previously been able to achieve this in GUIDE GUI. I'm however not able to figure out how to specify the 'Parent' axis for imcrop function.

If I just use imcrop, without specifying a parent, a pop-up window shows up in which i can crop the figure. I don't want this however.

After scouring similar questions and answers, I have tried the following, but to no avail.

image= imread('cameraman.jpg')
imcrop('Parent', app.UIaxes, image)
imcrop(image,'Parent',app.UIaxes)
imcrop(app.UIaxes,image)

I know for sure that the interactive mouse control on UIaxes(app designer) were not available in 2017 and 2018 Matlab versions. I have been reading through matlab documentation for app designer(2019a version) and I could not figure out if "imcrop" falls into the unsupported functionality, it makes no specific mention.

I would be very grateful if someone could clear my confusion!

Thank you!

Answer 1

[Guillaume]

imcrop doesn't have an option to specify an axis, according to the docs. However, instead of an image, you can specify a handle to an Image object inside an axis, it would be something like:

img = imread('cameraman.tif');
himg = imshow(img, 'Parent', app.UIaxes);
imcrop(himg);

However, this still fails because imcrop calls uicontextmenu which is not supported by App Designer. So I'm afraid imcrop is still not supported in R2019a.

[Shambavi Ganesh]

Oh alright, thank you! I do hope they get around to fixing this issue.

[Veronika Remenarova]

hey, I did it like this and it works for me

[colorbar,positions] = imcrop(app.img);

[Veronika Remenarova]

it opens the contextmenu, but as soon as I crop the colorbar and close the context menu I have my variable and I can continue the work

[Anubhuti Saha]

Thanks alot.. It works perfectly.