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## Copyright (C) 2004-2016 David Legland <david.legland@grignon.inra.fr>
## Copyright (C) 2004-2016 INRA - CEPIA Nantes - MIAJ (Jouy-en-Josas)
## Copyright (C) 2016 Adapted to Octave by Juan Pablo Carbajal <ajuanpi+dev@gmail.com>
## All rights reserved.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are met:
##
## 1 Redistributions of source code must retain the above copyright notice,
## this list of conditions and the following disclaimer.
## 2 Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in the
## documentation and/or other materials provided with the distribution.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ''AS IS''
## AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
## IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
## ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
## ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
## DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
## SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
## CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
## OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
%POLYGONBOUNDS Compute the bounding box of a polygon
%
% BOX = polygonBounds(POLY);
% Returns the bounding box of the polygon.
% BOX has the format: [XMIN XMAX YMIN YMAX].
%
% Input polygon POLY is as a N-by-2 array containing coordinates of each
% vertex.
% Multiple polygons can be specified either by inserting NaN rows between
% vertex coordinates, or by using a cell array, each cell containing the
% vertex coordinates of a polygon loop.
%
% See also
% polygons2d, boxes2d, boundingBox
% ------
% Author: David Legland
% e-mail: david.legland@nantes.inra.fr
% Created: 2007-10-12, using Matlab 7.4.0.287 (R2007a)
% Copyright 2007 INRA - Cepia software platform
function box = polygonBounds(polygon)
% transform as a cell array of simple polygons
polygons = splitPolygons(polygon);
% init extreme values
xmin = inf;
xmax = -inf;
ymin = inf;
ymax = -inf;
% iterate over loops
for i = 1:length(polygons)
polygon = polygons{i};
xmin = min(xmin, min(polygon(:,1)));
xmax = max(xmax, max(polygon(:,1)));
ymin = min(ymin, min(polygon(:,2)));
ymax = max(ymax, max(polygon(:,2)));
end
% format output
box = [xmin xmax ymin ymax];
endfunction
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