flickerTexture.m

function [flickerTexture]=flickerTexture(winWidth,winHeight,targetWidth,targetHeight)

%% Generate matrix for 4 target (Top, Right, Down, Left)
    for i=1:5
    targetMatrix{i} = zeros(winHeight,winWidth,'uint8');
    end
    %conver maxtrix from zero to target
%     00100 Top
%     10001 Left/Right
%     00100 Down
    for i =1:winHeight
        for j=1:winWidth
        %Target1 : Top
        if (j>= (winWidth/2-targetWidth/2))&&( j <= winWidth/2+targetWidth/2)&&( i <= targetHeight)
            targetMatrix{1}(i,j)=1; %match target coordinate
            %disp('got it');     
        end
        %Target3 : Down
         if (j>= (winWidth/2-targetWidth/2))&&( j <= winWidth/2+targetWidth/2)&&( i >= (winHeight-targetHeight))
            targetMatrix{3}(i,j)=1; %match target coordinate
            %disp('got it');            
         end
          %Target2 : Right
           if (j >= (winWidth - targetWidth))&&( i >= (winHeight/2-targetHeight/2))&&( i <= (winHeight/2+targetHeight/2))
           targetMatrix{2}(i,j)=1; %match target coordinate
           end
          %Target4 : Left
           if (j<= (targetWidth))&&( i >= (winHeight/2-targetHeight/2))&&( i <= (winHeight/2+targetHeight/2))
            targetMatrix{4}(i,j)=1; %match target coordinate
            %disp('got it');
           end
        end
    end
%%Draw texture to screen: Draw 16 states depens on the value of

    for targetState1=1:2
        for targetState2=1:2
            for targetState3=1:2
                for targetState4=1:2
                textureNumber = (targetState4-1)*8 +(targetState3-1)*4 +(targetState2-1)*2 +(targetState1-1)*1 +1;
                screenMatrix{textureNumber}=targetMatrix{5} | targetMatrix{1}*uint8(targetState1-1) |...
                targetMatrix{2}*uint8(targetState2-1) | targetMatrix{3}*uint8(targetState3-1) |...
                targetMatrix{4}*uint8(targetState4-1);
                end
            end
        end
    end
    flickerTexture = screenMatrix;
end