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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 = drawEllipse(varargin)
%DRAWELLIPSE Draw an ellipse on the current axis.
%
% drawEllipse(ELLI);
% Draws the ellipse ELLI in the form [XC YC RA RB THETA], with center
% (XC, YC), with main axis of half-length RA and RB, and orientation
% THETA in degrees counted counter-clockwise.
%
% drawEllipse(XC, YC, RA, RB);
% drawEllipse(XC, YC, RA, RB, THETA);
% Specifies ellipse parameters as separate arguments (old syntax).
%
% drawEllipse(..., NAME, VALUE);
% Specifies drawing style of ellipse, see the help of plot function.
%
% H = drawEllipse(...);
% Also returns handles to the created line objects.
%
% -> Parameters can also be arrays. In this case, all arrays are supposed
% to have the same size.
%
% Example:
% % Draw an ellipse centered in [50 50], with semi major axis length of
% % 40, semi minor axis length of 20, and rotated by 30 degrees.
% figure(1); clf; hold on;
% drawEllipse([50 50 40 20 30]);
% axis equal; axis([0 100 10 90])
%
% % add another ellipse with different orientation and style
% drawEllipse([50 50 40 20 -10], 'LineWidth', 2, 'Color', 'g');
%
%
% See also
% ellipses2d, drawCircle, drawEllipseArc, drawEllipseAxes
% fitEllipse, ellipseToPolygon, ellipsePoint, transformEllipse
%
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2003-12-11
% Copyright 2003-2023 INRA - TPV URPOI - BIA IMASTE
%% 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 i = 1:length(varargin)
if ischar(varargin{i})
styles = varargin(i:end);
varargin(i:end) = [];
break;
end
end
% extract ellipse parameters
if length(varargin) == 1
% ellipse is given in a single array
ellipse = varargin{1};
x0 = ellipse(:, 1);
y0 = ellipse(:, 2);
a = ellipse(:, 3);
b = ellipse(:, 4);
if length(ellipse) > 4
theta = ellipse(:, 5);
else
theta = zeros(size(x0));
end
elseif length(varargin) >= 4
% ellipse parameters given as separate arrays
x0 = varargin{1};
y0 = varargin{2};
a = varargin{3};
b = varargin{4};
if length(varargin) > 4
theta = varargin{5};
else
theta = zeros(size(x0));
end
else
error('drawEllipse: incorrect input arguments');
end
%% Process drawing of a set of ellipses
% angular positions of vertices
t = linspace(0, 2*pi, 145);
% empty array for graphic handles
h = zeros(length(x0), 1);
% save hold state
holdState = ishold(ax);
hold(ax, 'on');
%% Display each ellipse
for i = 1:length(x0)
% pre-compute rotation angles (given in degrees)
cot = cosd(theta(i));
sit = sind(theta(i));
% compute position of points used to draw current ellipse
xt = x0(i) + a(i) * cos(t) * cot - b(i) * sin(t) * sit;
yt = y0(i) + a(i) * cos(t) * sit + b(i) * sin(t) * cot;
% stores handle to graphic object
h(i) = plot(ax, xt, yt, styles{:});
end
%% post-processing
% restore hold state
if ~holdState
hold(ax, 'off');
end
% return handles if required
if nargout > 0
varargout = {h};
end
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