ginput with normalized coordinates of the figure window.

This function is an adapted version of the ginput function. The outut coordinates are the normalized coordinates of the figure window, instead of the x- and y-coordinate. This function can be used for adding annotations in the figure, for example:

a=ginput_norm(2);
annotation(figure1,'line',[a(1,1) a(2,1)],...
[a(1,2) a(2,2)],'LineStyle','--');