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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 = drawCircle(varargin)
%DRAWCIRCLE 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.
%
% drawCircle(AX, ...)
% Specifies the handle of the axis to draw on.
%
% H = drawCircle(...);
% return handles to each created curve.
%
% Example
% figure;
% hold on;
% drawCircle([10 20 30]);
% drawCircle([15 15 40], 'color', 'r', 'linewidth', 2);
% axis equal;
%
% See also
% circles2d, drawCircleArc, drawEllipse, circleToPolygon
%
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2003-10-31
% Copyright 2003-2023 INRA - TPV URPOI - BIA IMASTE
%% Parse input arguments
% extract handle of axis to draw on
[ax, varargin] = parseAxisHandle(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
% default number of discretization steps
N = 72;
% check if discretization step is specified
if ~isempty(varargin)
var = varargin{1};
if isnumeric(var) && isscalar(var)
N = round(var);
varargin(1) = [];
end
end
%% Pre-processing
% ensure each parameter is column vector
x0 = x0(:);
y0 = y0(:);
r = r(:);
% 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));
% save hold state
holdState = ishold(ax);
hold(ax, 'on');
%% Display each circle
% 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(ax, xt, yt, varargin{:});
end
%% Post-processing
% restore hold state
if ~holdState
hold(ax, 'off');
end
if nargout > 0
varargout = {h};
end
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