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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 = drawCircleArc(varargin)
%DRAWCIRCLEARC Draw a circle arc on the current axis.
%
% drawCircleArc(ARC);
% Draws circle arc defined by ARC = [XC YC R START EXTENT], with (XC, YC)
% being the circle center, R being the circle radius, starting from angle
% START, and with angular extent given by EXTENT. START and EXTENT angles
% are given in degrees.
%
% drawCircleArc(XC, YC, R, START, EXTENT);
% Alternative syntax that seperates inputs.
%
% drawCircleArc(..., PARAM, VALUE);
% specifies plot properties by using one or several parameter name-value
% pairs.
%
% drawCircleArc(AX, ...);
% Specifies handle of the axis to draw on.
%
% H = drawCircleArc(...);
% Returns a handle to the created line object.
%
% Example
% % Draw a red thick circle arc
% arc = [10 20 30 -120 240];
% figure;
% axis([-50 100 -50 100]);
% hold on
% drawCircleArc(arc, 'LineWidth', 3, 'Color', 'r')
%
% See also
% circles2d, drawCircle, drawEllipse, circleArcToPolyline
%
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2003-12-12
% Copyright 2003-2023 INRA - TPV URPOI - BIA IMASTE
%% Parse input arguments
% extract handle of axis to draw on
[ax, varargin] = parseAxisHandle(varargin{:});
circle = varargin{1};
if size(circle, 2) == 5
x0 = circle(:,1);
y0 = circle(:,2);
r = circle(:,3);
start = circle(:,4);
extent = circle(:,5);
varargin(1) = [];
elseif length(varargin) >= 5
x0 = varargin{1};
y0 = varargin{2};
r = varargin{3};
start = varargin{4};
extent = varargin{5};
varargin(1:5) = [];
else
error('drawCircleArc: please specify center, radius and angles of circle arc');
end
%% Pre-processing
% convert angles in radians
t0 = deg2rad(start);
t1 = t0 + deg2rad(extent);
% number of line segments
N = 60;
% initialize handles vector
h = zeros(length(x0), 1);
% save hold state
holdState = ishold(ax);
hold(ax, 'on');
%% Display each circle arc
% draw each circle arc individually
for i = 1:length(x0)
% compute basis
t = linspace(t0(i), t1(i), N+1)';
% compute vertices coordinates
xt = x0(i) + r(i)*cos(t);
yt = y0(i) + r(i)*sin(t);
% draw the circle arc
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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