MATLAB: How to refresh the image shown on gui, after a selection is made in the colormap popup menu by the user

colormapImage Processing Toolboxpetpop up menu

I am creating a gui with PET images and I have done a popup menu for the color look up table. Please help me on how to refresh the image after a choice is made from the pop up menu by the user. For example, When I choose 'bone' in the pop up menu from gui, the image should change to 'bone' color. But it doesn't as i have not refreshed the image yet and i need help with that syntax.

Best Answer

try calling

drawnow()

after having set the new color.

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MATLAB: Interactive GUI: pup-up menus, list

Jana - the _CreateFcn only gets called when the GUI is launched and the widgets/controls are created. You do not want to be calling this function once the GUI is running. If you have added code to this function that you wish to invoke at a later time, then you should put it in a separate function (still saved in your GUI m file). Something like

 function popupmenu1_CreateFcn(hObject, eventdata, handles)
 % invoke function to populate/refresh popupmenu1
 refreshPopupMenu1(hObject,handles);

where

 function refreshPopupMenu1(hObject,handles)
 % do stuff

Then, in your callback for the second popup menu, you would do something like

 function popupmenu1_Callback(hObject, eventdata, handles)
 refreshPopupMenu1(hObject,handles);

You would do the same for the other popu menu and list box.

MATLAB: GUI pop up menu

The popup will not automagically change from blue to red - you must have told it to in code, or the user changed it to red. It will not change by itself from blue (which the user just selected) to red.

If the GUI uses "blue" but the popup actually displays "red" then you're not getting the value of the popup when you need to use it. Get it like this

selectedItem = get(handles.popup1, 'Value');

Best Answer

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MATLAB: Interactive GUI: pup-up menus, list

MATLAB: GUI pop up menu

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