how does "[x,y] = WindowCenter(window)" work

when using [x,y] = WindowCenter(window) to determine the center of the window, what should "window" be?

[Rik]

I could not find that function in the Matlab documentation, nor could I easily find a function with this signature on the file exchange. Which function do you mean? Where did you get it from? Does it have any documentation?

[Torsten]

http://psychtoolbox.org/docs/WindowCenter

[Haojue Yu]

I think it comes from psychtoolbox

function [x,y] = WindowCenter(window)

% USAGE: [x,y] = WindowCenter(window)

% Returns a window's center point.

% History

% 26/03/2001 fwc made based on rectcenter

% 05-02-04 fwc OS X PTB compatible

if nargin~=1

error('Usage: [x,y] = WindowCenter(window)');

end

rect=Screen('Rect',window);

[x,y] = RectCenter(rect);

[Haojue Yu]

what should I input inside that parenthesis?

Answer 1

[Rik]

The documentation for that function is terrible. Let that be a lesson for when you write your own function. This help text is completely inadequate.

Even after reading the documentation for the Screen function, I can only tell you that window must be a window pointer or a screen number:

rect=Screen('Rect', windowPtrOrScreenNumber [, realFBSize=0]);

How you would get a window pointer is a mystery to me. Probably with this:

windowPtrs=Screen('Windows');

As this page says: "Return a vector of windowPtrs, including on- and off-screen windows."

[Haojue Yu]

Thank you so much!