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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 varargout = drawOrientedBox(varargin)
%DRAWORIENTEDBOX 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.
%
% drawOrientedBox(AX, ...)
% Specifies the axis to draw to point in. AX should be a handle to a axis
% object. By default, display on current axis.
%
% 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);
%
% Example
% % draw an ellipse together with its oriented box
% elli = [30 40 60 30 20];
% figure;
% drawEllipse(elli, 'linewidth', 2, 'color', 'g');
% hold on
% box = [30 40 120 60 20];
% drawOrientedBox(box, 'color', 'k');
% axis equal;
%
% See also
% orientedBox, drawPolygon, drawRect, drawBox, drawCenteredEdge
%
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2011-05-09, using Matlab 7.9.0.529 (R2009b)
% Copyright 2011-2023 INRA - Cepia Software Platform
%% Parses input arguments
% extract handle of axis to draw on
[ax, varargin] = parseAxisHandle(varargin{:});
% extract shape primitive
box = varargin{1};
varargin(1) = [];
if length(varargin) > 4 && sum(cellfun(@isnumeric, varargin(1:4))) == 4
% input given as separate arguments
cx = box;
cy = varargin{1};
hl = varargin{2} / 2;
hw = varargin{3} / 2;
theta = varargin{4};
varargin = varargin(5:end);
else
% input given as packed array
cx = box(:,1);
cy = box(:,2);
hl = box(:,3) / 2;
hw = box(:,4) / 2;
theta = box(:,5);
end
%% Pre-processing
% allocate memory for graphical handle
hr = zeros(length(cx), 1);
% save hold state
holdState = ishold(ax);
hold(ax, 'on');
%% Draw each box
% 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) = plot(ax, vx, vy, varargin{:});
end
%% Post-processing
% restore hold state
if ~holdState
hold(ax, 'off');
end
% Format output
if nargout > 0
varargout = {hr};
end
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