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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 = drawEllipseAxes(varargin)
%DRAWELLIPSEAXES Draw the main axes of an ellipse as line segments.
%
% drawEllipseAxes(ELLI)
% drawEllipseAxes(..., STYLE)
% drawEllipseAxes(..., NAME, VALUE)
% Draw the axes of the ellipse given by ELLI onto the currrent axis.
% STYLE specifies the drawing style using a short character array like
% 'b', 'k:', 'm-'...
% More complex drawing style can be specified using plot-like parameter
% name-value pairs.
%
% drawEllipseAxes(AX, ELLI)
% Specifies the axes to draw the ellipse on.
%
% Example
% elli = [50 50 40 20 30];
% figure; hold on; axis equal; axis([0 100 0 100]);
% drawEllipse(elli, 'LineWidth', 2, 'Color', 'b')
% drawEllipseAxes(elli, 'k')
%
% See also
% ellipses2d, drawEllipse, drawEllipseArc
%
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2022-09-11, using Matlab 9.9.0.1570001 (R2020b) Update 4
% Copyright 2022-2023 INRAE - BIA Research Unit - BIBS Platform (Nantes)
%% Extract input arguments
% extract handle of axis to draw on
if isAxisHandle(varargin{1})
ax = varargin{1};
varargin(1) = [];
else
ax = gca;
end
% extract dawing style strings
styles = {};
for iElli = 1:length(varargin)
if ischar(varargin{iElli})
styles = varargin(iElli:end);
varargin(iElli:end) = [];
break;
end
end
% retrieve ellipse parameters
ellipse = varargin{1};
x0 = ellipse(:, 1);
y0 = ellipse(:, 2);
a = ellipse(:, 3);
b = ellipse(:, 4);
theta = ellipse(:, 5);
nElli = length(x0);
%% Process drawing of a set of ellipses
% angular positions of edge extremities
ti = [0 pi pi/2 3*pi/2];
% compute position of points to draw each ellipse
h = zeros(2 * nElli , 1);
for iElli = 1:nElli
% pre-compute rotation angles (given in degrees)
cot = cosd(theta(iElli));
sit = sind(theta(iElli));
% compute position of points used to draw current ellipse
xt = x0(iElli) + a(iElli) * cos(ti) * cot - b(iElli) * sin(ti) * sit;
yt = y0(iElli) + a(iElli) * cos(ti) * sit + b(iElli) * sin(ti) * cot;
% stores handle to graphic object
h(2 * iElli - 1) = plot(ax, xt(1:2), yt(1:2), styles{:});
h(2 * iElli) = plot(ax, xt(3:4), yt(3:4), styles{:});
end
% return handles if required
if nargout > 0
varargout = {h};
end
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