MATLAB: How to define custom context menu for a ROI object

Question

Functions such as imellipse or imrect come with their own ready-made context menus. 

How can I override those and define my own custom context menus for ROI objects?

Answer 1

You need to set the uicontextmenu property of the underlying patch and line objects

which constitute the ROI object. Code example:

 

figure 
I=imshow('pout.tif');
% create a custom context menu
cmHandle = uicontextmenu;
uimenu(cmHandle,'Label','First Item');
uimenu(cmHandle,'Label','Second Item');
h = imellipse;
% set all context menus for the underlying line and patch objects
cmenu_obj = findobj(gcf,'Type','line','-or','Type','patch');
set(cmenu_obj,'uicontextmenu',cmHandle);