function trans = createTranslation(varargin)
%CREATETRANSLATION Create the 3*3 matrix of a translation.
%
%   TRANS = createTranslation(DX, DY);
%   Returns the translation corresponding to DX and DY.
%   The returned matrix has the form :
%   [1 0 TX]
%   [0 1 TY]
%   [0 0  1]
%
%   TRANS = createTranslation(VECTOR);
%   Returns the matrix corresponding to a translation by the vector [x y].
%
%
%   See also 
%   transforms2d, transformPoint, createRotation, createScaling

% ------
% Author: David Legland 
% E-mail: david.legland@inrae.fr
% Created: 2004-04-06
% Copyright 2004-2022 INRA - TPV URPOI - BIA IMASTE

% process input arguments
if isempty(varargin)
    tx = 0;
    ty = 0;
elseif length(varargin)==1
    var = varargin{1};
    tx = var(1);
    ty = var(2);
else
    tx = varargin{1};
    ty = varargin{2};
end

% create the matrix representing the translation
trans = [1 0 tx ; 0 1 ty ; 0 0 1];
