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function [result, ivx]=iViewXDriftCorrection(ivx, pos)
% driftcorrection routine of iViewX toolbox
% could also double as driftcorrection with a single point?
result=1;
absdcpos=[];
try
if ~exist('ivx', 'var') || isempty(ivx)
txt=[ mfilename ' requires a structure with iViewX default values as input.'];
error(txt);
end
if 1==exist('pos', 'var') && ~isempty(pos)
% if pos is supplied, we take the default value, but we first do
% some checks
if size(pos,1)==1 && size(pos,2)==2
if 1==IsInRect(pos(1,1), pos(1,2), Screen('Rect', ivx.window))
absdcpos=pos;
else
fprintf([mfilename ':supplied driftcorrection position is outside window, using default instead.\n']);
end
else
fprintf([mfilename ':something is wrong with the supplied driftcorrection position, using default instead.\n']);
end
end
if isempty(absdcpos)
% we take default value if no value is found yet
if ~isfield(ivx, 'absDCPos') || isempty(ivx.absDCPos) || size(ivx.absDCPos,1)~=1 || size(ivx.absCalPos,2)~=2
txt=[ mfilename ': something is wrong with default driftcorrection point pixel values.'];
error(txt);
else
absdcpos=ivx.absDCPos(1,:);
end
end
% Screen('FillRect',ivx.window, ivx.backgroundColour);
% Screen('Flip',ivx.window);
iViewX('erasescreen', ivx);
fprintf('Driftcorrection at position (%d, %d).\n', absdcpos(1,1), absdcpos(1,2));
pointShown=zeros(1,size(absdcpos,1));
nPointsShown=0;
i=0;
while 1
[keyIsDown,secs,keyCode] = KbCheck;
if keyCode(ivx.modifierKey) && keyCode(ivx.breakKey),
result=-1;
ivx.stop=1;
break;
end
if keyCode(ivx.breakKey),
result=-1;
break;
end
% determine next point
if ivx.orderedCalibration==1
i=i+1;
else
while 1
k=randperm(size(absdcpos,1));
if pointShown(k(1))==0
i=k(1);
break;
end
drawnow; % enables ctrl-c break?
end
end
iViewX('drawcalibrationpoint', ivx, [absdcpos(i,1), absdcpos(i,2)]);
pointShown(i)=1;
nPointsShown=nPointsShown+1;
% here we should probably send some information to the tracker about the
% present point
tEnd=GetSecs+ivx.calPaceSecs;
while GetSecs<tEnd
[keyIsDown,secs,keyCode] = KbCheck;
if keyCode(ivx.modifierKey) && keyCode(ivx.breakKey),
ivx.stop=1;
result=-1;
break;
end
if keyCode(ivx.breakKey),
result=-1;
break;
end
end
if nPointsShown==size(absdcpos,1)
break;
end
end
% Screen('FillRect',ivx.window, ivx.backgroundColour);
% Screen('Flip',ivx.window);
iViewX('erasescreen', ivx);
WaitSecs(ivx.calExtraTimeSecs);
fprintf('\nEnd of driftcorrection.\n');
catch
%this "catch" section executes in case of an error in the "try" section
%above. Importantly, it closes the onscreen window if its open.
Screen('CloseAll');
rethrow(lasterror);
end %try..catch..
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