Mercurial > octave
view scripts/geometry/rectint.m @ 30564:796f54d4ddbf stable
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2021.
In all .txi and .texi files except gpl.txi and gpl.texi in the
doc/liboctave and doc/interpreter directories, change the copyright
to "Octave Project Developers", the same as used for other source
files. Update copyright notices for 2022 (not done since 2019). For
gpl.txi and gpl.texi, change the copyright notice to be "Free Software
Foundation, Inc." and leave the date at 2007 only because this file
only contains the text of the GPL, not anything created by the Octave
Project Developers.
Add Paul Thomas to contributors.in.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Tue, 28 Dec 2021 18:22:40 -0500 |
parents | 0a5b15007766 |
children | 597f3ee61a48 |
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######################################################################## ## ## Copyright (C) 2016-2022 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this ## distribution or <https://octave.org/copyright/>. ## ## This file is part of Octave. ## ## Octave 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. ## ## Octave 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 ## <https://www.gnu.org/licenses/>. ## ######################################################################## ## -*- texinfo -*- ## @deftypefn {} {@var{area} =} rectint (@var{a}, @var{b}) ## Compute area or volume of intersection of rectangles or N-D boxes. ## ## Compute the area of intersection of rectangles in @var{a} and rectangles in ## @var{b}. N-dimensional boxes are supported in which case the volume, or ## hypervolume is computed according to the number of dimensions. ## ## 2-dimensional rectangles are defined as @code{[xpos ypos width height]} ## where xpos and ypos are the position of the bottom left corner. Higher ## dimensions are supported where the coordinates for the minimum value of each ## dimension follow the length of the box in that dimension, e.g., ## @code{[xpos ypos zpos kpos @dots{} width height depth k_length @dots{}]}. ## ## Each row of @var{a} and @var{b} define a rectangle, and if both define ## multiple rectangles, then the output, @var{area}, is a matrix where the i-th ## row corresponds to the i-th row of a and the j-th column corresponds to the ## j-th row of b. ## ## @seealso{polyarea} ## @end deftypefn function dists = rectint (a, b) if (nargin != 2) print_usage (); elseif (columns (a) != columns (b)) error ("rectint: A and B must have same number of columns"); elseif (ndims (a) > 2) error ("rectint: A and B must be 2-d arrays"); elseif (mod (columns (a), 2)) error ("rectint: number of columns of A and B must be a multiple of two"); endif nd = columns (a) / 2; na = rows (a); nb = rows (b); a_start = a(:,1:nd); b_start = b(:,1:nd); a_end = a_start + a(:,nd+1:end); b_end = b_start + b(:,nd+1:end); a_start = reshape (a_start, [na 1 nd]); b_start = reshape (b_start, [1 nb nd]); a_end = reshape (a_end, [na 1 nd]); b_end = reshape (b_end, [1 nb nd]); ## We get a 3d matrix where each dimension is in the 3rd dimension dists = bsxfun (@min , a_end, b_end) - bsxfun (@max, a_start, b_start); dists(dists < 0) = 0; dists = prod (dists, 3); endfunction ## Exactly overlapping %!assert (rectint ([0 0 1 1], [0 0 1 1]), 1) ## rect2 completely enclosed by rect1 %!assert (rectint ([-1 -1 3 3], [0 0 1 1]), 1) ## rect1 completely enclosed by rect2 %!assert (rectint ([0 0 1 1], [-1 -1 3 3]), 1) ## rect1 right and top in rect2 %!assert (rectint ([-1 -1 1.5 1.5], [0 0 1 1]), 0.25) ## rect2 right and top in rect1 %!assert (rectint ([0 0 1 1], [-1 -1 1.5 1.5]), 0.25) ## no overlap - shared corner %!assert (rectint ([0 0 1 1], [1 1 2 2]), 0) ## no overlap - shared edge %!assert (rectint ([0 0 1 1], [0 1 2 2]), 0) ## Correct orientation of output %!assert (rectint ([0 0 1 1;0.5 0.5 1 1;-1 -1 2 2], [1 1 2 2]), [0;0.25;0]) %!assert (rectint ([1 1 2 2], [0 0 1 1;0.5 0.5 1 1;-1 -1 2 2]), [0 0.25 0]) %!assert <*44904> (rectint ([0 0 5 5], [6 6 5 5]), 0) %!assert <*44904> (rectint ([0 0 5 5], [0 6 5 5]), 0) %!assert <*44904> (rectint ([0 0 5 5], [6 0 5 5]), 0) %!assert <*44904> (rectint ([0 0 0 5 5 5], [0 0 6 5 5 5]), 0) ## Test volumes %!shared r1, r2, r3, r4, r5 %! r1 = [ 5 3 0 7 5 2]; %! r2 = [ 2 5 0 4 2 2]; %! r3 = [ 10 7 0 10 3 2]; %! r4 = [ 10 -5 0 5 7 2]; %! r5 = [-10 0 0 40 11 2]; %!assert (rectint (r5, r1), 70) %!assert (rectint (r5, r4), 20) %!assert (rectint (r5, [r1; r2; r3; r4]), [70 16 60 20]) ## Test multiple volumes in both A and B %!assert (rectint ([r2; r5], [r1; r3; r4]), [4 0 0; 70 60 20])