VTS_setFixationParams.m

function params = VTS_setFixationParams(params)
% setParams - set parameters for different vibrotactile scans 
%
% params = setFixationParamsVTS(params)

% X,Y center location for fixation
params.display.fixX = (params.dstRect(1)+params.dstRect(3))/2;
params.display.fixY = (params.dstRect(2)+params.dstRect(4))/2;

% Fixation size in visual angle and in pixels
params.display.fixSizeAngle  = 0.30;
params.display.fixSizePixels = round(angle2pix(params.display,params.display.fixSizeAngle));

% Default colors are red and green ([R G B Alpha])
params.display.fixColorRgb   = [255 0 0 255; 0 255 0 255]; 

% Time within which a response is required for a detection to count as
%   correct
params.fix.responseTime       = [.01 3]; % seconds


switch lower(params.fixation)
    case 'disk'
        % all parameters are set in the defaults above
              
    case 'cross'        
        
        % First, find the points on a cross whose center is defined by
        %  (params.display.fixX, params.display.fixY) and whose length is
        %  +/- params.display.fixSizePixels
        pointsInLineParallel = -params.display.fixSizePixels:params.display.fixSizePixels;
        pointsInLinePerpendicular = zeros(size(pointsInLineParallel));
        dim.ycoord = params.display.fixY + [pointsInLineParallel pointsInLinePerpendicular] ;
        dim.xcoord = params.display.fixX + [pointsInLinePerpendicular pointsInLineParallel];
        params.display.fixCoords = [dim.xcoord;dim.ycoord];
        
        % Then specify the size of the dots making up the lines (ie the
        % thickness of the lines in pixels)
        params.display.fixSizeAngle  = 0.03;
        params.display.fixSizePixels = ceil(angle2pix(params.display,params.display.fixSizeAngle));
        
    otherwise
        error('Unknown fixationType!');
end