compose.m

% COMPOSE Compose an array of codes into a character
%
% Usage
%    code_char = compose(code);
%
% Input
%    code: An array of size 4-by-n where each of the four elements in each
%       column corresponding to a different direction (up, right, down, and
%       left) which can take one of the values 1 (empty), 2 (thin) or 3
%       (thick), 4 (thin dashed) and 5 (thick dashed).
%
% Output
%     code_char: An array of size 1-by-n containing the Unicode code point
%        values that correspond to the inputs. For example [1 2 1 2] gives a
%        horizontal line while [3 2 3 2] gives a thin horizontal line crossed
%        by a thick vertical one.

function code_char = compose(code)
    chars = cell(3,3,3,3);

    chars{1,1,1,2} = '74';
    chars{2,1,1,1} = '75';
    chars{1,2,1,1} = '76';
    chars{1,1,2,1} = '77';
    chars{1,1,1,3} = '78';
    chars{3,1,1,1} = '79';
    chars{1,3,1,1} = '7a';
    chars{1,1,3,1} = '7b';

    chars{1,2,1,2} = '00';
    chars{1,3,1,3} = '01';
    chars{2,1,2,1} = '02';
    chars{3,1,3,1} = '03';
    chars{1,3,1,2} = '7c';
    chars{2,1,3,1} = '7d';
    chars{1,2,1,3} = '7e';
    chars{3,1,2,1} = '7f';
    chars{1,2,2,1} = '0c';
    chars{1,3,2,1} = '0d';
    chars{1,2,3,1} = '0e';
    chars{1,3,3,1} = '0f';
    chars{1,1,2,2} = '10';
    chars{1,1,2,3} = '11';
    chars{1,1,3,2} = '12';
    chars{1,1,3,3} = '13';
    chars{2,2,1,1} = '14';
    chars{2,3,1,1} = '15';
    chars{3,2,1,1} = '16';
    chars{3,3,1,1} = '17';
    chars{2,1,1,2} = '18';
    chars{2,1,1,3} = '19';
    chars{3,1,1,2} = '1a';
    chars{3,1,1,3} = '1b';

    chars{2,2,2,1} = '1c';
    chars{2,3,2,1} = '1d';
    chars{3,2,2,1} = '1e';
    chars{2,2,3,1} = '1f';
    chars{3,2,3,1} = '20';
    chars{3,3,2,1} = '21';
    chars{2,3,3,1} = '22';
    chars{3,3,3,1} = '23';
    chars{2,1,2,2} = '24';
    chars{2,1,2,3} = '25';
    chars{3,1,2,2} = '26';
    chars{2,1,3,2} = '27';
    chars{3,1,3,2} = '28';
    chars{3,1,2,3} = '29';
    chars{2,1,3,3} = '2a';
    chars{3,1,3,3} = '2b';
    chars{1,2,2,2} = '2c';
    chars{1,2,2,3} = '2d';
    chars{1,3,2,2} = '2e';
    chars{1,3,2,3} = '2f';
    chars{1,2,3,2} = '30';
    chars{1,2,3,3} = '31';
    chars{1,3,3,2} = '32';
    chars{1,3,3,3} = '33';
    chars{2,2,1,2} = '34';
    chars{2,2,1,3} = '35';
    chars{2,3,1,2} = '36';
    chars{2,3,1,3} = '37';
    chars{3,2,1,2} = '38';
    chars{3,2,1,3} = '39';
    chars{3,3,1,2} = '3a';
    chars{3,3,1,3} = '3b';

    chars{2,2,2,2} = '3c';
    chars{2,2,2,3} = '3d';
    chars{2,3,2,2} = '3e';
    chars{2,3,2,3} = '3f';
    chars{3,2,2,2} = '40';
    chars{2,2,3,2} = '41';
    chars{3,2,3,2} = '42';
    chars{3,2,2,3} = '43';
    chars{3,3,2,2} = '44';
    chars{2,2,3,3} = '45';
    chars{2,3,3,2} = '46';
    chars{3,3,2,3} = '47';
    chars{2,3,3,3} = '48';
    chars{3,2,3,3} = '49';
    chars{3,3,3,2} = '4a';
    chars{3,3,3,3} = '4b';

    chars{1,1,1,1} = '73';

    chars = hex2dec('2500') + cellfun(@hex2dec, chars);

    chars(1,1,1,1) = 32;

    mask1 = all(bsxfun(@eq, [4 1 4 1]', code), 1);
    mask2 = all(bsxfun(@eq, [1 4 1 4]', code), 1);

    mask3 = all(bsxfun(@eq, [5 1 5 1]', code), 1);
    mask4 = all(bsxfun(@eq, [1 5 1 5]', code), 1);

    mask = mask1|mask2|mask3|mask4;

    code_char(mask1) = hex2dec('254e');
    code_char(mask2) = hex2dec('254c');
    code_char(mask3) = hex2dec('254f');
    code_char(mask4) = hex2dec('254d');

    code_char(~mask) = chars(1+3.^[0:3]*(feval(@(x,y)(x(y)), [1 2 3 2 3]', code(:,~mask))-1));
end