1 %% Copyright (c) 2011, INRA
2 %% 2003-2011, David Legland <david.legland@grignon.inra.fr>
3 %% 2011 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
5 %% All rights reserved.
6 %% (simplified BSD License)
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35 %% @deftypefn {Function File} {@var{h} = } drawCircle (@var{x0}, @var{y0}, @var{r})
36 %% @deftypefnx {Function File} {@var{h} = } drawCircle (@var{circle})
37 %% @deftypefnx {Function File} {@var{h} = } drawCircle (@var{center}, @var{radius})
38 %% @deftypefnx {Function File} {@var{h} = } drawCircle (@dots{}, @var{nstep})
39 %% @deftypefnx {Function File} {@var{h} = } drawCircle (@dots{}, @var{name}, @var{value})
40 %% Draw a circle on the current axis
42 %% drawCircle(X0, Y0, R);
43 %% Draw the circle with center (X0,Y0) and the radius R. If X0, Y0 and R
44 %% are column vectors of the same length, draw each circle successively.
46 %% drawCircle(CIRCLE);
47 %% Concatenate all parameters in a Nx3 array, where N is the number of
50 %% drawCircle(CENTER, RADIUS);
51 %% Specify CENTER as Nx2 array, and radius as a Nx1 array.
53 %% drawCircle(..., NSTEP);
54 %% Specify the number of edges that will be used to draw the circle.
55 %% Default value is 72, creating an approximation of one point for each 5
58 %% drawCircle(..., NAME, VALUE);
59 %% Specifies plotting options as pair of parameters name/value. See plot
60 %% documentation for details.
63 %% H = drawCircle(...);
64 %% return handles to each created curve.
66 %% @seealso{circles2d, drawCircleArc, drawEllipse}
69 function varargout = drawCircle(varargin)
71 % process input parameters
79 elseif size(var, 2) == 2
85 elseif size(var, 2) == 3
91 error('bad format for input in drawCircle');
94 % ensure each parameter is column vector
99 % default number of discretization steps
102 % check if discretization step is specified
103 if ~isempty(varargin)
105 if length(var)==1 && isnumeric(var)
111 % parametrization variable for circle (use N+1 as first point counts twice)
112 t = linspace(0, 2*pi, N+1);
116 % empty array for graphic handles
119 % compute discretization of each circle
121 xt = x0(i) + r(i) * cot;
122 yt = y0(i) + r(i) * sit;
124 h(i) = plot(xt, yt, varargin{:});