--- /dev/null
+%% Copyright (c) 2011, INRA
+%% 2003-2011, David Legland <david.legland@grignon.inra.fr>
+%% 2011 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
+%%
+%% All rights reserved.
+%% (simplified BSD License)
+%%
+%% 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 COPYRIGHT HOLDER 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 copyright holder.
+
+%% -*- texinfo -*-
+%% @deftypefn {Function File} {@var{h} = } drawEllipseArc (@var{arc})
+%% Draw an ellipse arc on the current axis.
+%%
+%% drawEllipseArc(ARC)
+%% draw ellipse arc specified by ARC. ARC has the format:
+%% ARC = [XC YC A B THETA T1 T2]
+%% or:
+%% ARC = [XC YC A B T1 T2] (isothetic ellipse)
+%% with center (XC, YC), main axis of half-length A, second axis of
+%% half-length B, and ellipse arc running from t1 to t2 (both in degrees,
+%% in Counter-Clockwise orientation).
+%%
+%% Parameters can also be arrays. In this case, all arrays are suposed to
+%% have the same size...
+%%
+%% @example
+%% % draw an ellipse arc: center = [10 20], radii = 50 and 30, theta = 45
+%% arc = [10 20 50 30 45 -90 270];
+%% figure;
+%% axis([-50 100 -50 100]); axis equal;
+%% hold on
+%% drawEllipseArc(arc, 'color', 'r')
+%%
+%% % draw another ellipse arc, between angles -60 and 70
+%% arc = [10 20 50 30 45 -60 (60+70)];
+%% figure;
+%% axis([-50 100 -50 100]); axis equal;
+%% hold on
+%% drawEllipseArc(arc, 'LineWidth', 2);
+%% ray1 = createRay([10 20], deg2rad(-60+45));
+%% drawRay(ray1)
+%% ray2 = createRay([10 20], deg2rad(70+45));
+%% drawRay(ray2)
+%% @end example
+%%
+%% @seealso{ellipses2d, drawEllipse, drawCircleArc}
+%% @end deftypefn
+
+function varargout = drawEllipseArc(varargin)
+
+ %% Extract input arguments
+
+ % extract dawing style strings
+ styles = {};
+ for i = 1:length(varargin)
+ if ischar(varargin{i})
+ styles = varargin(i:end);
+ varargin(i:end) = [];
+ break;
+ end
+ end
+
+ if length(varargin)==1
+ ellipse = varargin{1};
+ x0 = ellipse(1);
+ y0 = ellipse(2);
+ a = ellipse(3);
+ b = ellipse(4);
+ if size(ellipse, 2)>6
+ theta = ellipse(5);
+ start = ellipse(6);
+ extent = ellipse(7);
+ else
+ theta = zeros(size(x0));
+ start = ellipse(5);
+ extent = ellipse(6);
+ end
+
+ elseif length(varargin)>=6
+ x0 = varargin{1};
+ y0 = varargin{2};
+ a = varargin{3};
+ b = varargin{4};
+ if length(varargin)>6
+ theta = varargin{5};
+ start = varargin{6};
+ extent = varargin{7};
+ else
+ theta = zeros(size(x0));
+ start = varargin{5};
+ extent = varargin{6};
+ end
+
+ else
+ error('drawellipse: please specify center x, center y and radii a and b');
+ end
+
+
+ %% Drawing
+
+ % allocate memory for handles
+ h = zeros(size(x0));
+
+ for i = 1:length(x0)
+ % start and end angles
+ t1 = deg2rad(start);
+ t2 = t1 + deg2rad(extent);
+
+ % vertices of ellipse
+ t = linspace(t1, t2, 60);
+
+ % convert angles to ellipse parametrisation
+ sup = cos(t) > 0;
+ t(sup) = atan(a(i) / b(i) * tan(t(sup)));
+ t(~sup) = atan2(a(i) / b(i) * tan(2*pi - t(~sup)), -1);
+ t = mod(t, 2*pi);
+
+ % precompute cos and sin of theta (given in degrees)
+ cot = cosd(theta(i));
+ sit = sind(theta(i));
+
+ % compute position of points
+ 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;
+
+ h(i) = plot(xt, yt, styles{:});
+ end
+
+
+ %% Process output arguments
+
+ if nargout > 0
+ varargout = {h};
+ end
+
+endfunction
+
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