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function vol_geom = astra_create_vol_geom(varargin)
%--------------------------------------------------------------------------
% vol_geom = astra_create_vol_geom([row_count col_count]);
% vol_geom = astra_create_vol_geom(row_count, col_count);
% vol_geom = astra_create_vol_geom(row_count, col_count, min_x, max_x, min_y, max_y);
%
% Create a 2D volume geometry. See the API for more information.
% row_count: number of rows.
% col_count: number of columns.
% min_x: minimum value on the x-axis.
% max_x: maximum value on the x-axis.
% min_y: minimum value on the y-axis.
% max_y: maximum value on the y-axis.
% vol_geom: MATLAB struct containing all information of the geometry.
%--------------------------------------------------------------------------
% vol_geom = astra_create_vol_geom(row_count, col_count, slice_count);
% vol_geom = astra_create_vol_geom(row_count, col_count, slice_count, min_x, max_x, min_y, max_y, min_z, max_z);
%
% Create a 3D volume geometry. See the API for more information.
% row_count: number of rows.
% col_count: number of columns.
% slice_count: number of slices.
% vol_geom: MATLAB struct containing all information of the geometry.
%--------------------------------------------------------------------------
%--------------------------------------------------------------------------
% This file is part of the ASTRA Toolbox
%
% Copyright: 2010-2021, imec Vision Lab, University of Antwerp
% 2014-2021, CWI, Amsterdam
% License: Open Source under GPLv3
% Contact: astra@astra-toolbox.com
% Website: http://www.astra-toolbox.com/
%--------------------------------------------------------------------------
% astra_create_vol_geom([row_and_col_count ])
if numel(varargin) == 1 && numel(varargin{1}) == 1
vol_geom = struct();
vol_geom.GridRowCount = varargin{1}(1);
vol_geom.GridColCount = varargin{1}(1);
% astra_create_vol_geom([row_count col_count])
elseif numel(varargin) == 1 && numel(varargin{1}) == 2
vol_geom = struct();
vol_geom.GridRowCount = varargin{1}(1);
vol_geom.GridColCount = varargin{1}(2);
% astra_create_vol_geom([row_count col_count slice_count])
elseif numel(varargin) == 1 && numel(varargin{1}) == 3
vol_geom = struct();
vol_geom.GridRowCount = varargin{1}(1);
vol_geom.GridColCount = varargin{1}(2);
vol_geom.GridSliceCount = varargin{1}(3);
% astra_create_vol_geom(row_count, col_count)
elseif numel(varargin) == 2
vol_geom = struct();
vol_geom.GridRowCount = varargin{1};
vol_geom.GridColCount = varargin{2};
% astra_create_vol_geom(row_count, col_count, min_x, max_x, min_y, max_y)
elseif numel(varargin) == 6
vol_geom = struct();
vol_geom.GridRowCount = varargin{1};
vol_geom.GridColCount = varargin{2};
vol_geom.option.WindowMinX = varargin{3};
vol_geom.option.WindowMaxX = varargin{4};
vol_geom.option.WindowMinY = varargin{5};
vol_geom.option.WindowMaxY = varargin{6};
% astra_create_vol_geom(row_count, col_count, slice_count)
elseif numel(varargin) == 3
vol_geom = struct();
vol_geom.GridRowCount = varargin{1};
vol_geom.GridColCount = varargin{2};
vol_geom.GridSliceCount = varargin{3};
% astra_create_vol_geom(row_count, col_count, slice_count, min_x, max_x, min_y, max_y, min_z, max_z)
elseif numel(varargin) == 9
vol_geom = struct();
vol_geom.GridRowCount = varargin{1};
vol_geom.GridColCount = varargin{2};
vol_geom.GridSliceCount = varargin{3};
vol_geom.option.WindowMinX = varargin{4};
vol_geom.option.WindowMaxX = varargin{5};
vol_geom.option.WindowMinY = varargin{6};
vol_geom.option.WindowMaxY = varargin{7};
vol_geom.option.WindowMinZ = varargin{8};
vol_geom.option.WindowMaxZ = varargin{9};
end
% set the window options, if not set already.
if ~isfield(vol_geom, 'option') || ~isfield(vol_geom.option, 'WindowMinX')
vol_geom.option.WindowMinX = -vol_geom.GridColCount / 2;
vol_geom.option.WindowMaxX = vol_geom.GridColCount / 2;
vol_geom.option.WindowMinY = -vol_geom.GridRowCount / 2;
vol_geom.option.WindowMaxY = vol_geom.GridRowCount / 2;
if isfield(vol_geom, 'GridSliceCount')
vol_geom.option.WindowMinZ = -vol_geom.GridSliceCount / 2;
vol_geom.option.WindowMaxZ = vol_geom.GridSliceCount / 2;
end
end
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