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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 = drawPolyline(varargin)
%DRAWPOLYLINE Draw a polyline specified by a list of points.
%
% drawPolyline(COORD);
% packs coordinates in a single [N*2] array.
%
% drawPolyline(PX, PY);
% specifies coordinates in separate arrays. PX and PY must be column
% vectors with the same length.
%
% drawPolyline(..., TYPE);
% where TYPE is either 'closed' or 'open', specifies if last point must
% be connected to the first one ('closed') or not ('open').
% Default is 'open'.
%
% drawPolyline(..., PARAM, VALUE);
% specify plot options as described for plot command.
%
% H = drawPolyline(...) also return a handle to the list of line objects.
%
% Example:
% % Draw a curve representing an ellipse
% t = linspace(0, 2*pi, 100)';
% px = 10*cos(t); py = 5*sin(t);
% drawPolyline([px py], 'closed');
% axis equal;
%
% % The same, with different drawing options
% drawPolyline([px py], 'closed', 'lineWidth', 2, 'lineStyle', '--');
%
% See also
% polygons2d, drawPolygon
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2004-04-06
% Copyright 2004-2023 INRA - TPV URPOI - BIA IMASTE
% extract handle of axis to draw on
if isAxisHandle(varargin{1})
ax = varargin{1};
varargin(1) = [];
else
ax = gca;
end
% If first argument is a cell array, draw each curve individually,
% and eventually returns handle of each plot.
var = varargin{1};
if iscell(var)
h = [];
for i = 1:length(var(:))
h = [h ; drawPolyline(ax, var{i}, varargin{2:end})]; %#ok<AGROW>
end
if nargout > 0
varargout = {h};
end
return;
end
% extract curve coordinate
if size(var, 2) == 1
% first argument contains x coord, second argument contains y coord
px = var;
if length(varargin) == 1
error('Wrong number of arguments in drawPolyline');
end
py = varargin{2};
varargin = varargin(3:end);
else
% first argument contains both coordinate
px = var(:, 1);
py = var(:, 2);
varargin = varargin(2:end);
end
% check if curve is closed or open
closed = false;
if ~isempty(varargin)
var = varargin{1};
if strncmpi(var, 'close', 5)
closed = true;
varargin = varargin(2:end);
elseif strncmpi(var, 'open', 4)
closed = false;
varargin = varargin(2:end);
end
end
% if curve is closed, add first point at the end of the list
if closed
px = [px; px(1)];
py = [py; py(1)];
end
% plot the curve, with eventually optional parameters
h = plot(ax, px, py, varargin{:});
% format output arguments
if nargout > 0
varargout = {h};
end
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