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intersectBoxes.m    69 lines (61 with data), 2.6 kB

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## Copyright (C) 2004-2011 David Legland <david.legland@grignon.inra.fr>
## 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>
## 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.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{box} =} intersectBoxes (@var{box1}, @var{box2})
## Intersection of two bounding boxes.
##
## Example
##
## @example
## box1 = [5 20 5 30];
## box2 = [0 15 0 15];
## intersectBoxes(box1, box2)
## ans =
## 5 15 5 15
## @end example
##
## @seealso{boxes2d, drawBox, mergeBoxes}
## @end deftypefn
function bb = intersectBoxes(box1, box2)
# unify sizes of data
if size(box1,1) == 1
box1 = repmat(box1, size(box2,1), 1);
elseif size(box2, 1) == 1
box2 = repmat(box2, size(box1,1), 1);
elseif size(box1,1) != size(box2,1)
error('geom2d:Error',"Bad size for inputs.\n");
end
# compute extreme coords
mini = min(box1(:,[2 4]), box2(:,[2 4]));
maxi = max(box1(:,[1 3]), box2(:,[1 3]));
# concatenate result into a new box structure
bb = [maxi(:,1) mini(:,1) maxi(:,2) mini(:,2)];
endfunction
%!test
%! box1 = [5 20 10 25];
%! box2 = [0 15 15 20];
%! res = [5 15 15 20];
%! bb = intersectBoxes(box1, box2);
%! assert (res, bb, 1e-6);