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Accessing graphical mouse input before the input is finalized

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Peter
Peter 2013-4-8
关闭： MATLAB Answer Bot 2021-8-20
I would like to use imline to allow someone to do a regression visually. After plotting the data, I have a code that looks like the following:
p=imline;
fcn=makeConstrainToRectFcn('imline',get(gca,'XLim'),get(gca,'YLim'));
setPositionConstraintFcn(p,fcn);
Kids=get(p,'Children');
position = wait(p);
linepos=getPosition(p);
x=linepos(:,1);
y=linepos(:,2);
However, I can access x and y only after the user has confirmed his line by double-clicking on one end of the segment. I would like to be able to get x and y before the user finalizes his choice of points, so I can display a slope and intercept that vary as the user moves his end points.
Is there a way to do that?
Thanks in advance for your help!

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