How can I change pushbutton background

I constructed a number of pushbuttons by using the below loop, and now I want to change the background of each one when it was pressed.

 for i = 1 : 8
      for j = 1 : 7        
          btn(j,i) = uicontrol('Parent', figure_handle, ...
              'Style', 'pushbutton', ...
              'Position', [45+(i*51) 552-(j*50) 52 51],...
              'Callback', @changeBG);
      end
  end

How can i get the correct button to pass to changeBG function? Can someone help me?

Thank you

Answer 1

[Orion]

I'd say :

 for i = 1 : 8
      for j = 1 : 7        
          btn(j,i) = uicontrol('Parent', figure_handle, ...
              'Style', 'pushbutton', ...
              'Position', [45+(i*51) 552-(j*50) 52 51],...
              'Callback', {@changeBG,i,j}); % add too arguments to changeBG
      end
  end

then in changeBG, something like

function changeBG(hobject,evendata,i,j)

if i==1 && j==1
  set(hobject,'Backgroundcolor','r') % red for i=1, j=1
elseif ....
 % same kind of treatment for each of your button
elseif ....
elseif ....
elseif ....
end

[Tarcisio]

It works, but now I'm trying to pass a value of a matrix to the function. And I'm getting strange values:

[R,C] = size(matrix);

for i = 1 : C
    for j = 1 : R        
        btn(j,i) = uicontrol('Parent', figure_handle, ...
            'Style', 'pushbutton', ...
            'Position', [45+(i*lColumn) 552-(j*lRow) 52 51],...
            'Callback', {@changeBG,matrix(j,i),i,j});
    end
end

I'm getting numbers like 50, 51, 48 ... and my matrix only have numbers between 0 - 7.

Answer 2

[Daniel]

If you mean the background as a whole and not just the color... I normally perform this task by modifying the "cdata" of that pushbutton. That allows you for example to use images as pushbutton background. Be careful by defining the size of the images so they fit properly inside the pushbutton you defined.

Hope it helps!