/usr/share/psychtoolbox-3/PsychGLImageProcessing/private/bvlDrawCrosshair.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | function bvlDrawCrosshair(windowPtr, x, y, size, color)
% bvlDrawCrosshair(windowPtr, x, y [,size] [,color])
%
% Draw a crosshair centered at location x,y.
% windowPtr is the window pointer returned from Screen (PsychToolbox)
%
% size optionally specifies the size in pixels [default is 32]
%
% color is a 3x1 color vector - [r g b] with color range from 0:255
% if color is not specified, rect is drawn in white
%
% Create: 2007-05-15 - cburns
if nargin < 3
disp('Usage: bvlDrawCrosshair(windowPtr, x, y [,size] [,color])');
return;
end
if nargin < 4
size = 32;
end
if nargin < 5
color = [255 255 255];
end
x0 = x - size/2;
x1 = x + size/2;
y0 = y - size/2;
y1 = y + size/2;
% Horizontal line
Screen('DrawLine', windowPtr, color, x0, y, x1, y, 2);
% Vertical Line
Screen('DrawLine', windowPtr, color, x, y0, x, y1, 2);
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