zigzag2.m

混沌生成的很多形式

function [x,y] = zigzag(p,q);

%function to generate a zig-zag scan pattern
%(p,q) is current pixel position;(x,y) is next pixel position in the zigzag path 
if (p == q),
   if ( mod(p,2) == 0 ),
      x = p; y = q - 1;
   else
      x = p - 1; y = q;
   end
   
elseif (p > q),
   if( mod(p,2) == 0 ),
      x = p;y = q - 1;
   else
      x = p;y = q + 1;
   end
   
else
   if( mod(q,2) == 0 ),
      x = p + 1; y = q;
   else
      x = p - 1; y = q ;
   end
end

if (x == 0 ),
   x = 1; y = y + 1;
end

if (y == 0 ),
   x = x + 1; y = 1;
end