How to plot multiple clicked points on a Matlab axes?

Question

Using ginput (or ginputax) I ask my user to click on an axes 10 times (for spectrum baseline correction).

My axes is based on a GUIDE GUI.

Essentially this begins like this

plot(handles.axes_preview, ppm, xf_base, 'w-', 'LineWidth', 2);

spline_ppm = ginputax(handles.axes_preview, 10);

I'd like to plot each click (as ro) as they're being input, so the user has some feedback of where they clicked.

Any ideas how to code this?

Answer 1

How about a simple loop?

axis(handles.axes_preview); %// make handles.axes_preview the current axis
hold on
for ii = 1:10
    coords(ii,:) = ginput(1);
    plot(coords(ii,1),coords(ii,2),'ro')
end

Also, you may want to add

set(handles.axes_preview),'XLimMode','manual');
set(handles.axes_preview),'YLimMode','manual');

at the beginning to prevent the axis scale from automatically changing as points are input by the user.