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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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