External functions (with a GUI)

Question

Jakob Sørensen 2012-2-20

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/29633-external-functions-with-a-gui

编辑： Febrian Dhimas Syahfitra 2018-2-5

Hey there.

I'm currently working on a GUI, that has to show images in 3 different axes. I have no problem handling it insides the main *.m file for the GUI, but if i try to put the plotting code in a file for itself, then I can't use "axes(handles.axes1)" because handles, apparently, only can be accessed from the main file. Is there anyway to cope with this? And preferably something somewhat refined, since this is for my bachelor degree.

Thanks in advance

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Answer 1

Chandra Kurniawan 2012-2-20

1
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Hi,

Maybe this will helps.

I have GUI as shown in picture below :

For button "GRAY" and "BINARY", I perform image convertion with external functions.

I also call 'imshow' from external functions.

Here code about the main interface :

function pushbutton1_Callback(hObject, eventdata, handles)
handles.I = imread('peppers.png');
axes(handles.axes1);
imshow(handles.I);
guidata(hObject, handles);
function pushbutton2_Callback(hObject, eventdata, handles)
handles.J = rgb_to_gray(handles.I,handles.axes2);
guidata(hObject, handles);
function pushbutton3_Callback(hObject, eventdata, handles)
handles.K = im_to_bw(handles.J,handles.axes3);
guidata(hObject, handles);

And here the external functions

Perform rgb2gray

function J = rgb_to_gray(I,handles)
J = rgb2gray(I);
axes(handles);
imshow(J);

Perform im2bw

function J = im_to_bw(I,handles)
J = im2bw(I);
axes(handles);
imshow(J);

I hope this will helps

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Answer 2

Jakob Sørensen 2012-2-21

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/29633-external-functions-with-a-gui#answer_38148

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Got it to work, thanks to everyone contributing. To sum up (if anyone else has the same problem), what i needed was to use the "handle" variable when calling the external function. Like this:

output = functionName(input1, input2, ..., handle)

Otherwise you obviously can't use the "handle" in the external function. Once again, thanks.