%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function plotconn( x,y,conn, N, type )
%  plotconn( x,y,conn, N )
% (x,y) array of coordinates of centers of tiles
% conn : connection data 
% N : total number of tiles
%
% plots tiles and connections between tiles

if nargin < 5
    type =  'b-';
end

hold on

for n = 1:N
    for i = 1:3
        if conn(n,i) ~= 0
            plot( [x(n), x(conn(n,i))], [y(n), y(conn(n,i))], type);
        end
    end
end
hold off