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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 [edge, isInside] = clipRay(ray, bb)
%CLIPRAY Clip a ray with a box.
%
% EDGE = clipRay(RAY, BOX);
% RAY is a straight ray given as a 4 element row vector: [x0 y0 dx dy],
% with (x0 y0) being the origin of the ray and (dx dy) its direction
% vector, BOX is the clipping box, given by its extreme coordinates:
% [xmin xmax ymin ymax].
% The result is given as an edge, defined by the coordinates of its 2
% extreme points: [x1 y1 x2 y2].
% If the ray does not intersect the box, [NaN NaN NaN NaN] is returned.
%
% Function works also if RAY is a N-by-4 array, if BOX is a Nx4 array, or
% if both RAY and BOX are N-by-4 arrays. In these cases, EDGE is a N-by-4
% array.
%
% See also
% rays2d, boxes2d, edges2d, clipLine, drawRay
%
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2010-05-13, using Matlab 7.4.0.287 (R2007a)
% Copyright 2010-2023 INRA - Cepia Software Platform
% adjust size of two input arguments
if size(ray, 1) == 1
ray = repmat(ray, size(bb, 1), 1);
elseif size(bb, 1) == 1
bb = repmat(bb, size(ray, 1), 1);
elseif size(ray, 1) ~= size(bb, 1)
error('bad sizes for input');
end
% first compute clipping of supporting line
edge = clipLine(ray, bb);
% detects valid edges (edges outside box are all NaN)
inds = find(isfinite(edge(:, 1)));
% compute position of edge extremities relative to the ray
pos1 = linePosition(edge(inds,1:2), ray(inds,:), 'diag');
pos2 = linePosition(edge(inds,3:4), ray(inds,:), 'diag');
% if first point is before ray origin, replace by origin
edge(inds(pos1 < 0), 1:2) = ray(inds(pos1 < 0), 1:2);
% if last point of edge is before origin, set all edge to NaN
edge(inds(pos2 < 0), :) = NaN;
% eventually returns result about inside or outside
if nargout > 1
isInside = isfinite(edge(:,1));
end
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