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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 [polyOut, inputFormat] = parsePolygon(poly, format, varargin)
%PARSEPOLYGON Conversion between different polygon formats.
%
% POLYOUT = parsePolygon(POLY, FORMAT)
% Converts POLY to the specified format while FORMAT must be one of the
% following options: 'cell','nan','repetition','polyshape'. Mainly used
% in other polygon functions to bring the polygon into the required
% format.
%
% Example
% r = [2.5, 2, 1];
% poly = flipud(circleToPolygon([0 0 r(1)], round(2*pi*r(1))));
% midCircle = circleToPolygon([0 0 r(2)], round(2*pi*r(2)));
% innerCircle = flipud(circleToPolygon([0 0 r(3)], round(2*pi*r(3))));
% poly = {poly, midCircle, innerCircle};
% polyOut = parsePolygon(poly, 'repetition');
% polyOut = parsePolygon(polyOut, 'nan');
% polyOut = parsePolygon(polyOut, 'polyshape');
% polyOut = parsePolygon(polyOut, 'cell');
% assert(isequal(poly, polyOut))
%
% See also
% polygonToPolyshape
%
% ------
% Author: oqilipo
% E-mail: N/A
% Created: 2023-01-01, using MATLAB 9.13.0.2080170 (R2022b) Update 1
% Copyright 2023
% Parsing
p = inputParser;
addRequired(p,'format',...
@(x) any(validatestring(x,{'cell','nan','repetition','polyshape'})));
parse(p,format,varargin{:});
format = p.Results.format;
% If polygon is a polyshape object
if isa(poly,'polyshape')
polyOut = parsePolygon(poly.Vertices, format);
inputFormat = 'polyshape';
return
end
% If polygon is a cell
if iscell(poly)
[r, c] = size(poly);
if r > 1 && c > 1
error(['Non-supported polygon cell format with ' num2str(r) ' rows and ' num2str(c) 'columns!'])
elseif r > 1 && c == 1
polyCell = poly';
elseif r == 1 && c > 1
polyCell = poly;
elseif r == 1 && c == 1
polyCell = poly;
end
if any(cellfun(@(x) any(isnan(x(:))), poly))
error('Non-supported polygon cell format. Polygons in cell format should not contain NaN values!')
end
inputFormat = 'cell';
end
if ~iscell(poly) && any(isnan(poly(:)))
% If polygon contains nan
polyCell = splitPolygons(poly)';
inputFormat = 'nan';
elseif ~iscell(poly)
% If polygon contains vertex repetitions
polyBackup = poly;
polyCell = {};
count = 0;
while ~isempty(poly)
count = count+1;
repLIdx = ismember(poly, poly(1,:), 'rows');
repIdx = find(repLIdx);
if sum(repLIdx) == 1
polyCell = {poly};
if count == 1
break
else
warning('Contains vertex repetitions but the last vertex is not a repetiton!')
polyCell = {polyBackup};
end
elseif sum(repLIdx)>1
polyCell = [polyCell, {poly(1:repIdx(2)-1,:)}]; %#ok<AGROW>
poly(1:repIdx(2),:) = [];
end
end
inputFormat = 'repetition';
end
% Convert to output format
switch format
case 'cell'
polyOut = polyCell;
case 'nan'
polyOut = cell2mat((cellfun(@(x) [x; nan(1, size(x,2))], polyCell, 'UniformOutput',false))');
polyOut(end,:) = [];
case 'repetition'
polyOut = cell2mat((cellfun(@(x) [x; x(1,:)], polyCell, 'UniformOutput',false))');
case 'polyshape'
polyOut = polyshape(polyCell{1});
NoP = length(polyCell);
if NoP > 1
for p=2:NoP
polyOut = addboundary(polyOut, polyCell{p});
end
end
end
end
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