avw_flip

 AVW_FLIP - ortho-flip Analyze data image (avw.img)
 
 [ avw ] = avw_flip(avw,dims)
 
 where avw is the data struct returned from avw_img_read
 and dims is a cell array of strings, eg: dims = {'x','y','z'}
 with any number of cells, in any order.
 
 For each cell of dims, the dimension of avw.img is flipped, 
 independently of all other dimensions and the order in which
 they are specified.  There are no 3D rotations, which are 
 not orthogonal flips.
 
 This function will most likely invalidate the .img orientation, 
 so use of it is not recommended.  There is no attempt in this 
 function to maintain the validity of the avw.hdr.hist.orient 
 field.  In fact, this will be set to an invalid value (9).
 
 see also AVW_IMG_READ, AVW_VIEW

0001 function [ avw ] = avw_flip(avw,dims)
0002 
0003 % AVW_FLIP - ortho-flip Analyze data image (avw.img)
0004 %
0005 % [ avw ] = avw_flip(avw,dims)
0006 %
0007 % where avw is the data struct returned from avw_img_read
0008 % and dims is a cell array of strings, eg: dims = {'x','y','z'}
0009 % with any number of cells, in any order.
0010 %
0011 % For each cell of dims, the dimension of avw.img is flipped,
0012 % independently of all other dimensions and the order in which
0013 % they are specified.  There are no 3D rotations, which are
0014 % not orthogonal flips.
0015 %
0016 % This function will most likely invalidate the .img orientation,
0017 % so use of it is not recommended.  There is no attempt in this
0018 % function to maintain the validity of the avw.hdr.hist.orient
0019 % field.  In fact, this will be set to an invalid value (9).
0020 %
0021 % see also AVW_IMG_READ, AVW_VIEW
0022 %
0023 
0024 
0025 % $Revision: 1.1 $ $Date: 2004/11/12 01:30:25 $
0026 
0027 % Licence:  GNU GPL, no express or implied warranties
0028 % History:  01/2003, Darren.Weber@flinders.edu.au
0029 %
0030 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
0031 
0032 version = '[$Revision: 1.1 $]';
0033 fprintf('\nAVW_FLIP [v%s]\n',version(12:16));
0034 
0035 fprintf('...warning, this function can invalidate the .img orientation,\n');
0036 fprintf('...setting avw.hdr.hist.orient to invalid value = 9.\n');
0037 avw.hdr.hist.orient = uint8(9);
0038 
0039 for i = 1:length(dims),
0040     dim = lower(dims{i});
0041     switch dim,
0042     case 'x',
0043         fprintf('...flipping X\n');
0044         xdim = size(avw.img,1);
0045         avw.img = avw.img(xdim:-1:1,:,:);
0046     case 'y',
0047         fprintf('...flipping Y\n');
0048         ydim = size(avw.img,2);
0049         avw.img = avw.img(:,ydim:-1:1,:);
0050     case 'z',
0051         fprintf('...flipping Z\n');
0052         zdim = size(avw.img,3);
0053         avw.img = avw.img(:,:,zdim:-1:1);
0054     end
0055 end
0056 
0057 return