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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 = drawPolygon (px, varargin)
%DRAWPOLYGON Draw a polygon specified by a list of points.
%
% drawPolygon(POLY);
% Packs coordinates in a single N-by-2 array, with N the vertex number.
%
% drawPolygon(PX, PY);
% Specifies coordinates in separate arrays. Both array must be N-by-1,
% with N the number of vertices.
%
% drawPolygon(POLYS)
% Packs coordinate of several polygons in a cell array. Each element of
% the array is a Ni-by-2 double array.
%
% drawPolygon(..., NAME, VALUE);
% Specifies drawing options by using one or several parameter name-value
% pairs, see the doc of plot function for details.
%
% drawPolygon(AX, ...)
% Specifies the axis to draw the polygon on.
%
% H = drawPolygon(...);
% Also return a handle to the list of line objects.
%
% Example
% % draw a red rectangle
% poly = [10 10;40 10;40 30;10 30];
% figure; drawPolygon(poly, 'r');
% axis equal; axis([0 50 0 50]);
%
% % Draw two squares
% px = [10 20 20 10 NaN 30 40 40 30]';
% py = [10 10 20 20 NaN 10 10 20 20]';
% figure;
% drawPolygon([px py], 'lineWidth', 2);
% axis equal; axis([0 50 0 50]);
%
% See also
% polygons2d, drawPolyline
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2004-05-05
% Copyright 2004-2023 INRA - TPV URPOI - BIA IMASTE
% Store hold state
state = ishold(gca);
hold on;
%% Check input
if nargin < 1
error ('should specify at least one argument');
end
% check for empty polygons
if isempty (px)
return
end
% extract handle of axis to draw on
ax = gca;
if isAxisHandle(px)
ax = px;
px = varargin{1};
varargin(1) = [];
end
%% Manage cell arrays of polygons
% case of a set of polygons stored in a cell array
if iscell(px)
h = cellfun(@(x) drawPolygon(ax, x, varargin{:}), px, 'UniformOutput', 0);
h = horzcat(h{:});
else
% Check size vs number of arguments
if size(px, 2) == 2
% Case of polygon specified as a N-by-2 array (most standard case)
py = px(:, 2);
px = px(:, 1);
elseif size(px, 2) == 1
% Case of polygon specified as two N-by-1 arrays with same length
if nargin < 2 || nargin == 2 && ~isnumeric(varargin{1})
error('Matgeom:invalid_input_arg', ...
'Should specify either a N-by-2 array, or 2 N-by-1 vectors');
end
% Extract coordinates of polygon vertices
py = varargin{1};
varargin(1) = [];
if length(py) ~= length(px)
error('Matgeom:invalid_input_arg', ...
'X and Y coordinate arrays should have same lengths (%d,%d)', ...
length(px), length(py))
end
else
error('Matgeom:invalid_input_arg', 'Should specify a N-by-2 array');
end
% set default line format
if isempty (varargin)
varargin = {'b-'};
end
% Check case of polygons with holes
if any (isnan (px(:)) )
polygons = splitPolygons ([px py]);
h = drawPolygon (ax, polygons, varargin{:});
else
% ensure last point is the same as the first one
px(end+1, :) = px(1,:);
py(end+1, :) = py(1,:);
% draw the polygon outline
h = plot(ax, px, py, varargin{:});
end % whether there where holes
end % whether input arg was a cell
if ~state
hold off
end
% avoid returning argument if not required
if nargout > 0
varargout = {h};
end
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