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f = figure(); % create figure and get its handle
ax = axes(); % create axes and get its handle
xlim([0 1]); % set limits of axes
ylim([0 1]);
hold on; % hold the axes so that the xlim and ylim does not change.
l = line(0, 0); % create an empty line
l.XData = [];
l.YData = [];
while waitforbuttonpress == 0
point = ax.CurrentPoint(1, 1:2); % get coordinate of current point
l.XData = [l.XData point(1)]; % add the current point to the line l
l.YData = [l.YData point(2)];
end
