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## Copyright (C) 2024 David Legland
## 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.
##
## The views and conclusions contained in the software and documentation are
## those of the authors and should not be interpreted as representing official
## policies, either expressed or implied, of the copyright holders.
function polys = readPolygonSet(filename)
%READPOLYGONSET Read a set of simple polygons stored in a file.
%
% POLY = readPolygonSet(FILENAME);
% Returns the polygon stored in the file FILENAME.
% Polygons are assumed to be stored in text files, without headers, with
% x and y coordinates packed in two separate lines:
% X11 X12 X13 ... X1N
% Y11 Y12 Y13 ... Y1N
% X21 X22 X23 ... X2N
% Y21 Y22 Y23 ... Y2N
%
% Each polygon may have a different number of vertices. The result is a
% cell array of polygon, each cell containing a N-by-2 array representing
% the vertex coordinates.
%
% See also
% polygons2d
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2004-04-11
% Copyright 2004-2023 INRA - TPV URPOI - BIA IMASTE
% the set of polygons (no pre-allocation, as we do not know how many
% polygons are stored)
polys = {};
% index of polygon
p = 0;
% open file for reading
fid = fopen(filename, 'rt');
% use an infinite loop, terminated in case of EOF
while true
% set of X, and Y coordinates
line1 = fgetl(fid);
line2 = fgetl(fid);
% break loop if end of file is reached
if line1 == -1
break;
end
% create a new polygon by concatenating vertex coordinates
p = p + 1;
polys{p} = [str2num(line1)' str2num(line2)']; %#ok<AGROW,ST2NM>
end
% close file
fclose(fid);
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