/usr/share/octave/packages/geometry-1.7.0/geom2d/drawOrientedBox.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>
## 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
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##
## 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
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## DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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## 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{hb} = } drawOrientedBox (@var{box})
## @deftypefnx {Function File} {@var{hb} = } drawOrientedBox (@dots{}, @var{param}, @var{value})
## Draw centered oriented rectangle.
##
## Syntax
## drawOrientedBox(BOX)
## drawOrientedBox(BOX, 'PropertyName', propertyvalue, ...)
##
## Description
## drawOrientedBox(OBOX)
## Draws an oriented rectangle (or bounding box) on the current axis.
## OBOX is a 1-by-5 row vector containing box center, dimension (length
## and width) and orientation (in degrees):
## OBOX = [CX CY LENGTH WIDTH THETA].
##
## When OBOX is a N-by-5 array, the N boxes are drawn.
##
## HB = drawOrientedBox(...)
## Returns a handle to the created graphic object(s). Object style can be
## modified using syntaw like:
## set(HB, 'color', 'g', 'linewidth', 2);
##
## @seealso{drawPolygon, drawRect, drawBox}
## @end deftypefn
function varargout = drawOrientedBox(box, varargin)
## Parses input arguments
if nargin > 4 && sum(cellfun(@isnumeric, varargin(1:4))) == 4
cx = box;
cy = varargin{1};
hl = varargin{2} / 2;
hw = varargin{3} / 2;
theta = varargin{4};
varargin = varargin(5:end);
else
cx = box(:,1);
cy = box(:,2);
hl = box(:,3) / 2;
hw = box(:,4) / 2;
theta = box(:,5);
end
## Draw each box
# allocate memory for graphical handle
hr = zeros(length(cx), 1);
# iterate on oriented boxes
for i = 1:length(cx)
# pre-compute angle data
cot = cosd(theta(i));
sit = sind(theta(i));
# x and y shifts
lc = hl(i) * cot;
ls = hl(i) * sit;
wc = hw(i) * cot;
ws = hw(i) * sit;
# coordinates of box vertices
vx = cx(i) + [-lc + ws; lc + ws ; lc - ws ; -lc - ws ; -lc + ws];
vy = cy(i) + [-ls - wc; ls - wc ; ls + wc ; -ls + wc ; -ls - wc];
# draw polygons
hr(i) = line(vx, vy, varargin{:});
end
## Format output
if nargout > 0
varargout = {hr};
end
endfunction
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