You can determine which mouse event has occurred by examining the 'SelectionType' property of the figure. The property can take the following values:
1. normal: left mouse button
2. extend: right mouse button on a 2-button mouse;
middle mouse button on a 3-button mouse
3. alt: left+right buttons on a 2-button mouse;
right mouse button on a 3-button mouse
4. open:double mouse click
For example, you can see the values taken by executing the following:
figure;
set(gcf,'WindowButtonDownFcn', 'disp(get(gcf,''SelectionType''));');
Now click in the current figure to see the values displayed.
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