how draw Image Correlation (horizontal or vertical or diagonal pixel ) in mtlab

Hi....

how are you draw this code such as picture attached this code :

I=rgb2gray(im2double(P));

c_diag = corrcoef(I(1:end-1, 1:end-1), I(2:end, 2:end));

c_vert = corrcoef(I(1:end-1, :), I(2:end, :));

c_horz = corrcoef(I(:, 1:end-1, :), I(:, 2:end));