image callback in app designer
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I have an app with a UIAxes which contains an image with the returned image object im i.e.im=image(UIAxesObject, array). I create a buttondownfcn callback using
im.ButtonDownFcn = @FCN. However, if I create the function FCN(app, event) inside the private or public function area of the app designer I get an error. The only way I seem to be able to get the callback to work is to put function FCN in a separate m. file. Is there another way of creating callback functions in app designer?
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Guillaume
el 25 de Jun. de 2019
I suspect you've defined the callback incorrectly. Typically the code would be something likle
classdef myapp < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
UIAxes matlab.ui.control.UIAxes
%... other controls. You can't edit this directly
end
%your own properties
properties (Access = private)
myimage; %property to hold the image
end
%...
methods (Access = private)
function ImageButtonDownCallback(app, source, eventargs)
%... the callback code
end
%The function that creates the image and enable the callback
function something(app)
app.myimage = imshow(someimage, 'Parent', app.UIAxes); %image creation
app.myimage.ButtonDownFcn = @app.ImageButtonDownCallback; %create callback. IMPORTANT: You must use app.****
end
end
end
2 comentarios
Guillaume
el 25 de Jun. de 2019
Indeed, you have:
- the image function
- the image type, returned by image, imshow, imagesc and probably other functions. The full name of that type is actually matlab.graphics.primitive.Image. It's not really well documented. The only doc page is its property page.
- the app designer image control whose full name is matlab.ui.control.Image. Again, not very well documented. It has a different set of properties and callbacks from the previous image type.
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