/usr/share/octave/packages/geometry-1.7.0/graphs/drawGraph.m is in octave-geometry 1.7.0-1build1.
This file is owned by root:root, with mode 0o644.
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## Copyright (C) 2004-2011 INRA - CEPIA Nantes - MIAJ (Jouy-en-Josas)
## Copyright (C) 2012 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
## 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.
## -*- texinfo -*-
## @deftypefn {Function File} drawGraph (@var{nodes}, @var{edges})
## @deftypefnx {Function File} drawGraph (@var{nodes}, @var{edges}, @var{faces})
## @deftypefnx {Function File} drawGraph (@var{graph})
## @deftypefnx {Function File} drawGraph (@dots{}, @var{snodes})
## @deftypefnx {Function File} drawGraph (@dots{}, @var{snodes}, @var{sedges})
## @deftypefnx {Function File} drawGraph (@dots{}, @var{snodes}, @var{sedges}, @var{sfaces})
## @deftypefnx {Function File} {@var{h} = } drawGraph (@dots{})
## @deftypefnx {Function File} {[@var{h} @var{he}] = } drawGraph (@dots{})
## @deftypefnx {Function File} {[@var{h} @var{he} @var{hf}] = } drawGraph (@dots{})
## Draw a graph, given as a set of vertices and edges
##
## DRAWGRAPH(NODES, EDGES)
## draw a graph specified by a set of nodes (array N*2 or N*3,
## corresponding to coordinate of each node), and a set of edges (an array
## Ne*2, containing for each edge the first and the second node).
## Default drawing is a red circle for nodes and a blue line for edges.
##
## DRAWGRAPH(NODES, EDGES, FACES)
## also draw faces of the graph as patches.
##
## DRAWGRAPH(GRAPH)
## passes argument in a srtucture with at least 2 fields named 'nodes' and
## 'edges', and possibly one field 'faces', corresponding to previously
## described parameters.
## GRAPH can also be a cell array, whose first element is node array,
## second element is edges array, and third element, if present, is faces
## array.
##
##
## DRAWGRAPH(..., SNODES)
## DRAWGRAPH(..., SNODES, SEDGES)
## DRAWGRAPH(..., SNODES, SEDGES, SFACES)
## specify the draw mode for each element, as in the classical 'plot'
## function. To not display some elements, uses 'none'.
##
##
## H = DRAWGRAPH(...)
## return handle to the set of edges.
##
## [HN, HE] = DRAWGRAPH(...)
## return handle to the set of nodes and to the set of edges.
##
## [HN, HE, HF] = DRAWGRAPH(...)
## Also return handle to the set of faces.
##
## @end deftypefn
function varargout = drawGraph(varargin)
## initialisations
# uses empty arrays by default for edges and faces
e = [];
f = [];
# default styles for nodes, edges, and faces
# nodes are drawn as red circles
sn = {'linestyle', 'none', 'color', 'r', 'marker', 'o'};
# edges are drawn as blue lines
se = {'linestyle', '-', 'color', 'b'};
# faces are cyan, their edges are not drawn
sf = {'EdgeColor', 'none', 'Facecolor', 'c'};
## Process input arguments
# case of a call without arguments
if nargin==0
help drawGraph;
return;
end
# ---------------------------------------------------------------
# First extract the graph structure
var = varargin{1};
if iscell(var)
# graph is stored as a cell array: first cell is nodes, second one is
# edges, and third is faces
n = var{1};
if length(var)>1
e = var{2};
end
if length(var)>2
f = var{3};
end
varargin(1) = [];
elseif isstruct(var)
# graph is stored as a structure, with fields 'nodes', 'edges', and
# eventually 'faces'.
n = var.nodes;
e = var.edges;
if isfield(var, 'faces')
f = var.faces;
end
varargin(1) = [];
else
# graph is stored as set of variables: nodes, edges, and eventually
# faces
n = varargin{1};
e = varargin{2};
varargin(1:2) = [];
if ~isempty(varargin)
var = varargin{1};
if isnumeric(var)
# faces are stored in a numeric array of indices
f = var;
varargin(1) = [];
elseif iscell(var)
if ~ischar(var{1})
# faces are stored in a cell array, each cell containing a
# row vector of indices
f = var;
varargin(1) = [];
end
end
end
end
# extract drawing style
if ~isempty(varargin)
sn = concatArguments(sn, varargin{1});
end
if length(varargin)>1
se = concatArguments(se, varargin{2});
end
if length(varargin)>2
sf = concatArguments(sf, varargin{3});
end
## main drawing processing
hold on;
if size(n, 2)==2
# Draw a 2 dimensional graph ----------------------
# Draw faces of the graph ------------
if ~strcmp(sf{1}, 'none') && ~isempty(f)
if iscell(f)
# each face is contained in a cell.
hf = zeros(size(f));
for fi=1:length(f)
hf(fi) = patch('Faces', f{fi}, 'Vertices', n, sf{:});
end
else
# process faces as an Nf*N array. Nf is the number of faces,
# and all faces have the same number of vertices (nodes).
hf = patch('Faces', f, 'Vertices', n, sf{:});
end
end
# Draw 2D Edges ----------------------
if ~strcmp(se{1}, 'none') && size(e, 1)>0
he = plot([n(e(:,1),1) n(e(:,2),1)]', [n(e(:,1),2) n(e(:,2),2)]', se{:});
end
# Draw 2D nodes ----------------------
if ~strcmp(sn{1}, 'none')
hn = plot(n(:,1), n(:,2), sn{:});
end
elseif size(n, 2)==3
# Draw a 3 dimensional graph ----------------------
# use a zbuffer to avoid display pbms.
set(gcf, 'renderer', 'zbuffer');
# Draw 3D Faces ----------------------
if ~strcmp(sf{1}, 'none')
if iscell(f)
# each face is contained in a cell.
hf = zeros(size(f));
for fi=1:length(f)
hf(fi) = patch('Faces', f{fi}, 'Vertices', n, sf{:});
end
else
# process faces as an Nf*N array. Nf i the number of faces,
# and all faces have the same number of vertices (nodes).
hf = patch('Faces', f, 'Vertices', n, sf{:});
end
end
# Draw 3D edges ----------------------
if ~strcmp(se{1}, 'none') && size(e, 1)>0
# he = plot3(...
# [n(e(:,1),1) n(e(:,2),1)]', ...
# [n(e(:,1),2) n(e(:,2),2)]', ...
# [n(e(:,1),3) n(e(:,2),3)]', ...
# se{:});
he = line(...
[n(e(:,1),1) n(e(:,2),1)]', ...
[n(e(:,1),2) n(e(:,2),2)]', ...
[n(e(:,1),3) n(e(:,2),3)]', ...
se{:});
end
# Draw 3D nodes ----------------------
if ~strcmp(sn{1}, 'none');
hn = plot3(n(:,1), n(:,2), n(:,3), sn{:});
end
end
## Format output arguments
# return handle to edges
if nargout==1
varargout{1} = he;
end
# return handle to nodes and edges
if nargout==2
varargout{1} = hn;
varargout{2} = he;
end
# return handle to nodes, edges and faces
if nargout==3
varargout{1} = hn;
varargout{2} = he;
varargout{3} = hf;
end
endfunction
function res = concatArguments(in1, in2)
# in1 is a cell array already initialized
# in2 is an argument that can be:
# - empty
# - the string 'none'
# - another cell array
if isempty(in2)
res = in1;
return;
end
if ischar(in2)
if strcmp('none', in2)
res = {'none'};
return;
end
end
if iscell(in1)
res = [in1(:)' in2(:)'];
else
res = [{in1} in2(:)];
end
endfunction
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