Get correct positions on gui to draw lines between pushbuttons GUIDE

Hi everyone!

I am having trouble using the positions parameter of my matlab gui. I have cretaed a gui with several pushbuttons and I have put an image as background of the gui. Whenever a pushbutton is pressed the position of the pushbutton is saved and when the ok button is pressed lines between pushbutton should be drawn. Here is where I am stuck, I cant find a solution.

To get every pushbutton position I use:

pos = get(hObject, 'Position'); 

The code I use when pressing the ok button is this (handles.positions has the x and y coordinates of every pushbutton pressed):

[m n] = size(handles.positions);
x = handles.positions(:,1);
y = handles.positions(:,2);
x = x';
y= y';
axes
ah = axes('unit', 'normalized', 'position', [0 0 1 1]);
imagesc(handles.bg);
hold  on
line(x,y)
handles.i = 0
guidata(hObject, handles);

If someone knows how to solve this it would be great. Thanks to all!

Answer 1

[Walter Roberson]

The Position of a uicontrol is never axes data coordinates such as is needed to draw on the image.

axes
ah = axes('unit', 'normalized', 'position', [0 0 1 1]);
imagesc(handles.bg);

You are creating two new axes there, and then when you draw the image, it is not certain that it will be drawn in either of those two. See https://www.mathworks.com/matlabcentral/answers/?term=tag%3Aalways-parent