Change imellipse position when the string in edit-text uicontrol is updated.

1 次查看（过去 30 天）
Ramaprasad Kulkarni
Hi All,
I rather have a strange requirement. I display an image in an axes of a GUI figure created using GUIDE. I use imellipse to select a circle in the image. Although imellipse allows me to resize it by dragging the boundaries, I also want to resize it based on the vector entered in the uicontrol edit-text.
Essentially, when imellipse is run, a popup window with edit-text uicontrol is created with some initial position vector of the ellipse. I want to change the position vector in the edit-text which gets reflected in the position of ellipse in the image and also that the resizing of imellipse updates the vector in edit-text.
I was able to do the latter part using the following lines of code (under a function called crop) -
EllipseHandle = imellipse(gca,[0.25*width 0.25*height 0.5*width 0.5*height]);
addNewPositionCallback(EllipseHandle,@(p) set(handles.CroppingVector,'String',num2str(p,3)));
CroppingVector is the tag for the edit-text uicontrol.
Now, I want to update the position of the ellipse when the vector in edit-text is changed. I am able to read the updated vector in the callback function for edit-text which looks like this:
function CroppingVector_Callback(hObject, eventdata, handles)
% hObject handle to CroppingVector (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
Pos = str2num(get(handles.CroppingVector,'String'));
However, I am having difficulty trying to understand how to update the ellipse position. I tried using (immediately after above line of code in the callback function for edit-text)
setConstrainedPosition(EllipseHandle,Pos);
But I get the following error
Undefined function 'setConstrainedPosition' for input arguments of type 'double'.
Obviously, EllipseHandle is not recognized. Can anyone please suggest a working solution to my problem?
-- Thanks, Ram.

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