function[returnString] = createBlockImages(s)
%% What this code does is, given an input string of captial letters, passes
%% consecutive letters (first is current location, second is next location) 
%% into blockGeneration (the function that actually
%% generates the block and saves it to a folder 'blockImages' under your
%% working directory.  
%% ** YOU HAVE TO CREATE A DIRECTORY CALLED blockImages' IN YOUR WORKING
%% DIRECTORY, OTHERWISE YOU GET THE COMPLAINT
%%  Could not open file for writing.  Check directory or file permissions.
%%
%% For the last letter of the sequence, it has the next
%% waypoint as 'END'.  For all letters NOT in the given sequence, it
%% creates an image that has itself as current and next.
%%
%% Ex.  you make a call to generateBlocks
%%          createBlockImages('ABCXYZ');
%%      and get images for: A->B, B->C, C->X, X->Y, Y->Z, Z->End
%%


%%  zoomFactor is a "played with" variable that was correct for the
%%  printer at C-Core; for future use, you'll likely need to play with it
%%  again
zoomFactor = 56;

%% letterPicked keeps track of which letters have already been assigned
letterPicked = zeros(1, 26);

for i = 1:(size(s, 2) - 1)
    blockGeneration(s(i), s(i+1), zoomFactor);
    letterPicked(double(s(i) - 64)) = 1;
end

blockGeneration(s(size(s, 2)), 'END', zoomFactor);
letterPicked(double(s(size(s, 2))) - 64) = 1;

%% now doing self-reference block
for i = 1:26
    if (letterPicked(i) == 0)
      blockGeneration(char(i + 64), char(i + 64), zoomFactor);  
    end
end