/usr/share/octave/packages/octclip-1.0.8/oc_polybool.m is in octave-octclip 1.0.8-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##
## This file is part of OctCLIP.
##
## OctCLIP is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or (at
## your option) any later version.
##
## This program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn{Function File}{[@var{X},@var{Y},@var{nPol},@var{nInt},@var{nPert}] =}oc_polybool(@var{sub},@var{clip},@var{op})
## @deftypefnx{Function File}{[@var{X},@var{Y},@var{nPol},@var{nInt},@var{nPert}] =}oc_polybool(@var{sub},@var{clip})
##
## This function performs boolean operations between two polygons using the
## Greiner-Hormann algorithm (http://davis.wpi.edu/~matt/courses/clipping/).
##
## @var{sub} is a two column matrix containing the X and Y coordinates of the
## vertices for the subject polygon.
##
## @var{clip} is a two column matrix containing the X and Y coordinates of the
## vertices for the clipper polygon.
##
## @var{op} is a text string containing the operation to perform between
## @var{sub} and @var{clip}. Possible values are:
##
## @itemize @bullet
## @item @var{'AND'}
## Intersection of @var{sub} and @var{clip} (value by default).
## @item @var{'OR'}
## Union of @var{subt} and @var{clip}.
## @item @var{'AB'}
## Operation @var{sub} - @var{clip}.
## @item @var{'BA'}
## Operation of @var{clip} - @var{sub}.
## @end itemize
##
## For the matrices @var{sub} and @var{clip}, the first point is not needed to
## be repeated at the end (but is permitted). Pairs of (NaN,NaN) coordinates in
## @var{sub} and/or @var{clip} are omitted, so they are treated as if each one
## stored a single polygon.
##
## @var{X} is a column vector containing the X coordinates of the vertices of
## the resultant polygon(s).
##
## @var{Y} is a column vector containing the Y coordinates of the vertices of
## the resultant polygon(s).
##
## @var{nPol} is the number of output polygons.
##
## @var{nInt} is the number of intersections between @var{sub} and @var{clip}.
##
## @var{nPert} is the number of perturbed points of the @var{clip} polygon in
## any particular case (points in the oborder of the other polygon) occurs see
## http://davis.wpi.edu/~matt/courses/clipping/ for details.
## @end deftypefn
function [X,Y,nPol,nInt,nPert] = oc_polybool(sub,clip,op)
try
functionName = 'oc_polybool';
minArg = 2;
maxArg = 3;
%*******************************************************************************
%NUMBER OF INPUT ARGUMENTS CHECKING
%*******************************************************************************
%number of input arguments checking
if (nargin<minArg)||(nargin>maxArg)
error(['Incorrect number of input arguments (%d)\n\t ',...
'Correct number of input arguments = %d or %d'],...
nargin,minArg,maxArg);
end
%check if we omit the op argument
if nargin==minArg
%by default, use AND
op = 'AND';
end
%*******************************************************************************
%INPUT ARGUMENTS CHECKING
%*******************************************************************************
%checking input arguments
[op] = checkInputArguments(sub,clip,op);
catch
%error message
error('\n\tIn function %s:\n\t -%s ',functionName,lasterr);
end
%*******************************************************************************
%COMPUTATION
%*******************************************************************************
try
%calling oct function
[X,Y,nPol,nInt,nPert] = _oc_polybool(sub,clip,op);
catch
%error message
error('\n\tIn function %s:\n\tIn function %s ',functionName,lasterr);
end
%*******************************************************************************
%AUXILIARY FUNCTION
%*******************************************************************************
function [outOp] = checkInputArguments(sub,clip,inOp)
%sub must be matrix type
if isnumeric(sub)
%a dimensions
[rowSub,colSub] = size(sub);
else
error('The first input argument is not numeric');
end
%clip must be matrix type
if isnumeric(clip)
%b dimensions
[rowClip,colClip] = size(clip);
else
error('The second input argument is not numeric');
end
%checking dimensions
if (colSub~=2)||(colClip~=2)
error('The columns of input arguments must be 2');
end
%operation must be a text string
if ~ischar(inOp)
error('The third input argument is not a text string');
else
%upper case
outOp = toupper(inOp);
%check values
if (~strcmp(outOp,'AND'))&&(~strcmp(outOp,'OR'))&& ...
(~strcmp(outOp,'AB'))&&(~strcmp(outOp,'BA'))
error('The third input argument is not correct');
end
end
%*****END OF FUNCIONS*****
%*****FUNCTION TESTS*****
%tests for input arguments
%!error(oc_polybool)
%!error(oc_polybool(1,2,3,4))
%!error(oc_polybool('string',2,3))
%!error(oc_polybool(1,'string',3))
%!error(oc_polybool(1,2,3))
%demo program
%!demo
%! %subject polygon
%! clSub = [9.0 7.5
%! 9.0 3.0
%! 2.0 3.0
%! 2.0 4.0
%! 8.0 4.0
%! 8.0 5.0
%! 2.0 5.0
%! 2.0 6.0
%! 8.0 6.0
%! 8.0 7.0
%! 2.0 7.0
%! 2.0 7.5
%! 9.0 7.5];
%! %clipper polygon
%! clClip = [2.5 1.0
%! 7.0 1.0
%! 7.0 8.0
%! 6.0 8.0
%! 6.0 2.0
%! 5.0 2.0
%! 5.0 8.0
%! 4.0 8.0
%! 4.0 2.0
%! 3.0 2.0
%! 3.0 8.0
%! 2.5 8.0
%! 2.5 1.0];
%! %limits for the plots
%! clXLim = [1.5 11.75];
%! clYLim = [0.5 8.50];
%! %compute intersection
%! [clXI,clYI] = oc_polybool(clSub,clClip,'and');
%! %compute union
%! [clXU,clYU] = oc_polybool(clSub,clClip,'or');
%! %compute A-B
%! [clXA,clYA] = oc_polybool(clSub,clClip,'ab');
%! %compute B-A
%! [clXB,clYB] = oc_polybool(clSub,clClip,'ba');
%! %plot window for intersection
%! subplot(2,2,1);
%! plot(clXI,clYI,'r.-','markersize',10,'linewidth',3,clSub(:,1),clSub(:,2),...
%! clClip(:,1),clClip(:,2));
%! axis('equal');
%! xlim(clXLim);
%! ylim(clYLim);
%! title('OctCLIP intersection');
%! legend('Intersection','Subject polygon','Clipper polygon',...
%! 'location','southeast');
%! %plot window for union
%! subplot(2,2,2);
%! plot(clXU,clYU,'r.-','markersize',10,'linewidth',3,clSub(:,1),clSub(:,2),...
%! clClip(:,1),clClip(:,2));
%! axis('equal');
%! xlim(clXLim);
%! ylim(clYLim);
%! title('OctCLIP union');
%! legend('Union','Subject polygon','Clipper polygon','location','southeast');
%! %plot window for A-B
%! subplot(2,2,3);
%! plot(clXA,clYA,'r.-','markersize',10,'linewidth',3,clSub(:,1),clSub(:,2),...
%! clClip(:,1),clClip(:,2));
%! axis('equal');
%! xlim(clXLim);
%! ylim(clYLim);
%! title('OctCLIP A-B');
%! legend('A-B','Subject polygon','Clipper polygon','location','southeast');
%! %plot window for B-A
%! subplot(2,2,4);
%! plot(clXB,clYB,'r.-','markersize',10,'linewidth',3,clSub(:,1),clSub(:,2),...
%! clClip(:,1),clClip(:,2));
%! axis('equal');
%! xlim(clXLim);
%! ylim(clYLim);
%! title('OctCLIP B-A');
%! legend('B-A','Subject polygon','Clipper polygon','location','southeast');
%! %input message
%! disp('Press ENTER to continue ...');
%! pause();
%! %kill and close the plot window
%! clf();
%! close();
%*****END OF TESTS*****
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