/usr/share/octave/packages/geometry-1.7.0/geom2d/clipPoints.m is in octave-geometry 1.7.0-1build1.
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## Copyright (C) 2004-2011 INRA - CEPIA Nantes - MIAJ (Jouy-en-Josas)
## Copyright (C) 2012 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
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## -*- texinfo -*-
## @deftypefn {Function File} {@var{points2} =} clipPoints (@var{points}, @var{box})
## Clip a set of points by a box.
##
## Returns the set @var{points2} which are located inside of the box @var{box}.
##
## @seealso{points2d, boxes2d, clipLine, drawPoint}
## @end deftypefn
function points = clipPoints(points, bb)
# get bounding box limits
xmin = bb(1);
xmax = bb(2);
ymin = bb(3);
ymax = bb(4);
# compute indices of points inside visible area
xOk = points(:,1)>=xmin & points(:,1)<=xmax;
yOk = points(:,2)>=ymin & points(:,2)<=ymax;
# keep only points inside box
points = points(xOk & yOk, :);
endfunction
%!demo
%! points = 2*rand(100,2)-1;
%! bb = [-0.5 0.5 -0.25 0.25];
%! cpo = clipPoints (points, bb);
%!
%! plot(points(:,1),points(:,2),'xr')
%! hold on
%! drawBox(bb,'color','k')
%! plot(cpo(:,1),cpo(:,2),'*g')
%! hold off
%!shared bb
%! bb = [0 10 0 20];
%!test
%! corners = [0 0;10 0;0 20;10 20];
%! cornersClipped = clipPoints(corners, bb);
%! assert (4, size(cornersClipped, 1));
%! assert (corners, cornersClipped, 1e-6);
%!test
%! borders = [0 5;10 5;5 0;5 20];
%! bordersClipped = clipPoints(borders, bb);
%! assert (4, size(bordersClipped, 1));
%! assert (borders, bordersClipped, 1e-6);
%!test
%! inside = [5 5;5 10;5 15];
%! insideClipped = clipPoints(inside, bb);
%! assert (size(inside, 1), size(insideClipped, 1));
%! assert (inside, insideClipped);
%!test
%! points = [-1 0;11 0;-1 20;11 20;0 -1;0 21;10 -1;10 21];
%! pointsClipped = clipPoints(points, bb);
%! assert (0, size(pointsClipped, 1));
%!test
%! points = [-5 10;0 10;5 10;10 10; 15 10];
%! pointsClipped = clipPoints(points, bb);
%! assert (3, size(pointsClipped, 1));
%! assert (points(2:4,:), pointsClipped, 1e-6);
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