/usr/share/octave/packages/geometry-1.7.0/geom2d/drawEllipse.m is in octave-geometry 1.7.0-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 | ## Copyright (C) 2004-2011 David Legland <david.legland@grignon.inra.fr>
## 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
## 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
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## 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,
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## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{h} = } drawEllipse (@var{elli})
## @deftypefnx {Function File} {@var{h} = } drawEllipse (@var{xc}, @var{yc}, @var{ra}, @var{rb})
## @deftypefnx {Function File} {@var{h} = } drawEllipse (@var{xc}, @var{yc}, @var{ra}, @var{rb}, @var{theta})
## @deftypefnx {Function File} {@var{h} = } drawEllipse (@dots{}, @var{param}, @var{value})
## 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.
## Puts all parameters into one single array.
##
## 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:
## @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;
## @end example
##
## @seealso{ellipses2d, drawCircle, drawEllipseArc, ellipseAsPolygon}
## @end deftypefn
function varargout = drawEllipse(varargin)
# 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);
# compute position of points to draw each ellipse
h = zeros(length(x0), 1);
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(xt, yt, styles{:});
end
# return handles if required
if nargout > 0
varargout = {h};
end
endfunction
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