Puzzling CurrentPoint property behaviour in figure

Temu Gautama

2020 2 13

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Hi,

I have some puzzling behaviour on the CurrentPoint property of a figure. Normally, it only changes when you click (and release) inside the figure. This is what I get in this code:

close all
hFig = figure( 1 )
while( ishandle( hFig ))
    title( get( hFig, 'CurrentPoint' ))
    drawnow
end

However, when I add a dummy callback function on the WindowButtonMotionFcn, I get the current position of the mouse pointer (which was, accidently, what I was looking for):

close all
hFig = figure( 1 )
set( hFig, 'WindowButtonMotionFcn', @( src1, evt1 ) 1 );
while( ishandle( hFig ))
    title( get( hFig, 'CurrentPoint' ))
    drawnow
end

Can anybody explain this behaviour? I am using R2015b.

Thanks,

Temu

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Adam 2020-2-13

I would imagine it is just being intelligent and only updating the property when it is actually needed. And adding a button motion callback counts as it being needed even though the callback itself happens not to make use of it, I guess.