1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
## Copyright (C) 2019 Juan Pablo Carbajal
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program. If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @defun {} drawFilledPolygon (@var{p})
## @defunx {} drawFilledPolygon (@var{hax}, @var{p})
## @defunx {} clipPolygon (@dots{}, @var{prop}, @var{value}, @dots{})
## @defunx {@var{h} =} drawFilledPolygon (@dots{})
## Draw a filled polygon.
##
## Add a patch representing the polygon(s) @var{p} in the current axes.
##
## Multiple property-value pairs may be specified, but they must
## appear in pairs. These arguments are passed to the function @code{patch}.
##
## If the first argument @var{hax} is an axes handle, then plot into this
## axes, rather than the current axes returned by @code{gca}.
##
## If @var{p} is a cell, each element of the cell is processed in sequence.
##
## The optional return value @var{h} is a vector of graphics handles to the
## created patch objects.
##
## For example:
##
## Draw a polygon with default filling color and red edges.
##
## @example
## @group
## pol = [1 2; 7 4; 4 7; 1 2; NaN NaN; 2.5 3; 5.5 4; 4 5.5; 2.5 3];
## h = drawFilledPolygon (pol, 'edgecolor', 'r');
## @end group
## @end example
##
## @seealso{drawPolygon, polygon2patch, patch}
## @end defun
## Author: Juan Pablo Carbajal <ajuanpi+dev@gmail.com>
## Created: 2019-12-15
function h = drawFilledPolygon (px, varargin)
# Check input
if (nargin < 1)
print_usage ();
endif
# Check for empty polygons
if (isempty (px))
return
endif
# Store hold state
state = ishold (gca);
hold on;
# 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))
np = numel (px);
h_ = zeros(1, np);
for i = 1:np
h_(np - i + 1) = drawFilledPolygon (px{i}, varargin{:});
endfor
else
# Check size vs number of arguments
if (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('Octave:invalid-input-arg', ...
['drawFilledPolygon: Should specify either a N-by-2 array,' ...
' or 2 N-by-1 vectors']);
endif
# Merge coordinates of polygon vertices
py = varargin{1};
varargin(1) = [];
if (length (py) ~= length (px))
error('Octave:invalid-input-arg', ...
['drawFilledPolygon: X and Y coordinate arrays should have' ...
' same lengths (%d,%d)'], length (px), length (py))
endif
px = [px py];
elseif (size (px, 2) > 2 || size (px, 2) < 1)
error ('Octave:invalid-input-arg', ...
'drawFilledPolygon: Should specify a N-by-2 array');
endif
# Set default format
fmtdef = {'facecolor', [0.7 0.7 0.7], ...
'edgecolor', 'k', ...
'linewidth', 2};
varargin = {fmtdef{:}, varargin{:}};
# if (isempty (varargin))
# varargin = formatdef;
# else # set missing with defaults
# [tfdef, idxarg] = ismember (formatdef(1:2:end), ...
# tolower (varargin(1:2:end)));
# if (any (tfdef))
# idxdef = find (tfdef);
# idxarg = idxarg(idxarg > 0);
# varargin(2 * idxarg) = formatdef(2 * idxdef);
# endif
# endif
pxpatch = polygon2patch (px);
h_ = patch (ax, pxpatch(:,1), pxpatch(:,2), varargin{:});
endif # whether input arg was a cell
if (~state)
hold off
endif
# Avoid returning argument if not required
if (nargout > 0)
h = h_;
endif
endfunction
%!demo
%! figure (1)
%! clf;
%! pol = [1 2; 7 4; 4 7; 1 2; NaN NaN; 2.5 3; 5.5 4; 4 5.5; 2.5 3];
%! subplot(131)
%! drawFilledPolygon(pol)
%! axis tight equal off
%! subplot(132)
%! drawFilledPolygon(pol, 'facecolor', 'c', 'linestyle', '--', 'edgecolor', 'r')
%! axis tight equal off
%! subplot(133)
%! R = createRotation (polygonCentroid (splitPolygons(pol){1}), pi/6);
%! pol2 = transformPoint (pol, R);
%! drawFilledPolygon(pol, 'linestyle', 'none')
%! drawFilledPolygon(gca, pol2, 'facealpha', 0.5)
%! axis tight equal off
%!demo
%! pol = [2 2; 6 2; 6 6; 2 6; 2 2; NaN NaN; 3 3; 3 5; 5 5; 5 3; 3 3];
%! n = 5;
%! alpha = linspace(0.1, 1, n);
%! theta = linspace(pi / 3, 0, n);
%!
%! cpol = cell(n, 1);
%! for i = 1:n
%! cpol{i} = transformPoint (pol, createRotation (theta(i)));
%! endfor
%! h = drawFilledPolygon(cpol, 'linestyle', 'none');
%! for i = 1:n-1
%! set(h(i), 'facealpha', alpha(i))
%! endfor
%! axis tight equal off
|
