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## Copyright (C) 2024 David Legland
## All rights reserved.
##
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## modification, are permitted provided that the following conditions are met:
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function S = prolateSurfaceArea(elli, varargin)
%PROLATESURFACEAREA Approximated surface area of a prolate ellipsoid.
%
% S = prolateSurfaceArea(R1,R2)
%
% Example
% prolateSurfaceArea
%
% See also
% geom3d, ellipsoidSurfaceArea, oblateSurfaceArea
%
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2015-07-03, using Matlab 7.9.0.529 (R2009b)
% Copyright 2015-2023 INRA - Cepia Software Platform
%% Parse input argument
if size(elli, 2) == 7
R1 = elli(:, 4);
R2 = elli(:, 5);
elseif size(elli, 2) == 1 && ~isempty(varargin)
R1 = elli(:, 1);
R2 = varargin{1};
end
assert(R1 > R2, 'first radius must be larger than second radius');
% surface theorique d'un ellipsoide prolate
% cf http://fr.wikipedia.org/wiki/Ellipso%C3%AFde_de_r%C3%A9volution
e = sqrt(R1.^2 - R2.^2) ./ R1;
S = 2 * pi * R2.^2 + 2 * pi * R1 .* R2 .* asin(e) ./ e;
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