How can I save the coordinates from ginput()?

I want to get the bounding boxes of two buttons on a screen.

I would like to write a loop with ginput such that for each button, I want to get input (ginput) from the mouse for four points, which will form the bounding box for the buttons. Something like:

for 1:3; %For 3 buttons

    [x,y] = ginput(4) %Get the mouse input from 4 clicks (This forms the bouding box)

end

But this code is wrong because the third iteration will overwrite the coordinates that I got from the first and second iterations.

Also, I'd like to save these so that if I type in x(2), I get all the x coordinates for the second button. If I type in y(2), I get all the y coordinates for the second button.

Thank you!

[Jake]

Sorry, I want to get the bounding boxes of THREE buttons on a screen, or picutre

Answer 1

[Azzi Abdelmalek]

Use a cellarray

for k=1:3; %For 3 buttons
  [ii,jj] = ginput(4) 
  x{k}=ii
  y{k}=jj
end

[Jake]

This does not work. It gives me the first x value, then for the second iteration it gives me the first x value and the 2nd x value. Same for y.

[Azzi Abdelmalek]

No, it works. Check the result

cell2mat(x)
cell2mat(y)

Answer 2

[Image Analyst]

Why not just use rbbox()??? That would be the more sensible way to draw a box around something than calling ginput(4). Here's the demo from the help:

uiwait(msgbox('Draw the box'));
k = waitforbuttonpress;
point1 = get(gca,'CurrentPoint');    % button down detected
finalRect = rbbox;                   % return figure units
point2 = get(gca,'CurrentPoint');    % button up detected
point1 = point1(1,1:2);              % extract x and y
point2 = point2(1,1:2);
p1 = min(point1,point2);             % calculate locations
offset = abs(point1-point2);         % and dimensions
x = [p1(1) p1(1)+offset(1) p1(1)+offset(1) p1(1) p1(1)]
y = [p1(2) p1(2) p1(2)+offset(2) p1(2)+offset(2) p1(2)]
hold on
axis manual
plot(x,y)