/usr/share/octave/packages/geometry-1.7.0/geom2d/drawCircle.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 | ## 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
## 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.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{h} = } drawCircle (@var{x0}, @var{y0}, @var{r})
## @deftypefnx {Function File} {@var{h} = } drawCircle (@var{circle})
## @deftypefnx {Function File} {@var{h} = } drawCircle (@var{center}, @var{radius})
## @deftypefnx {Function File} {@var{h} = } drawCircle (@dots{}, @var{nstep})
## @deftypefnx {Function File} {@var{h} = } drawCircle (@dots{}, @var{name}, @var{value})
## Draw a circle on the current axis
##
## drawCircle(X0, Y0, R);
## Draw the circle with center (X0,Y0) and the radius R. If X0, Y0 and R
## are column vectors of the same length, draw each circle successively.
##
## drawCircle(CIRCLE);
## Concatenate all parameters in a Nx3 array, where N is the number of
## circles to draw.
##
## drawCircle(CENTER, RADIUS);
## Specify CENTER as Nx2 array, and radius as a Nx1 array.
##
## drawCircle(..., NSTEP);
## Specify the number of edges that will be used to draw the circle.
## Default value is 72, creating an approximation of one point for each 5
## degrees.
##
## drawCircle(..., NAME, VALUE);
## Specifies plotting options as pair of parameters name/value. See plot
## documentation for details.
##
##
## H = drawCircle(...);
## return handles to each created curve.
##
## @seealso{circles2d, drawCircleArc, drawEllipse}
## @end deftypefn
function varargout = drawCircle(varargin)
# process input parameters
var = varargin{1};
if size(var, 2) == 1
x0 = varargin{1};
y0 = varargin{2};
r = varargin{3};
varargin(1:3) = [];
elseif size(var, 2) == 2
x0 = var(:,1);
y0 = var(:,2);
r = varargin{2};
varargin(1:2) = [];
elseif size(var, 2) == 3
x0 = var(:,1);
y0 = var(:,2);
r = var(:,3);
varargin(1) = [];
else
error('bad format for input in drawCircle');
end
# ensure each parameter is column vector
x0 = x0(:);
y0 = y0(:);
r = r(:);
# default number of discretization steps
N = 72;
# check if discretization step is specified
if ~isempty(varargin)
var = varargin{1};
if length(var)==1 && isnumeric(var)
N = round(var);
varargin(1) = [];
end
end
# parametrization variable for circle (use N+1 as first point counts twice)
t = linspace(0, 2*pi, N+1);
cot = cos(t);
sit = sin(t);
# empty array for graphic handles
h = zeros(size(x0));
# compute discretization of each circle
for i = 1:length(x0)
xt = x0(i) + r(i) * cot;
yt = y0(i) + r(i) * sit;
h(i) = plot(xt, yt, varargin{:});
end
if nargout > 0
varargout = {h};
end
endfunction
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