1######################################################################## 2## 3## Copyright (C) 2003-2021 The Octave Project Developers 4## 5## See the file COPYRIGHT.md in the top-level directory of this 6## distribution or <https://octave.org/copyright/>. 7## 8## This file is part of Octave. 9## 10## Octave is free software: you can redistribute it and/or modify it 11## under the terms of the GNU General Public License as published by 12## the Free Software Foundation, either version 3 of the License, or 13## (at your option) any later version. 14## 15## Octave is distributed in the hope that it will be useful, but 16## WITHOUT ANY WARRANTY; without even the implied warranty of 17## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18## GNU General Public License for more details. 19## 20## You should have received a copy of the GNU General Public License 21## along with Octave; see the file COPYING. If not, see 22## <https://www.gnu.org/licenses/>. 23## 24######################################################################## 25 26## -*- texinfo -*- 27## @deftypefn {} {} contourf (@var{z}) 28## @deftypefnx {} {} contourf (@var{z}, @var{vn}) 29## @deftypefnx {} {} contourf (@var{x}, @var{y}, @var{z}) 30## @deftypefnx {} {} contourf (@var{x}, @var{y}, @var{z}, @var{vn}) 31## @deftypefnx {} {} contourf (@dots{}, @var{style}) 32## @deftypefnx {} {} contourf (@var{hax}, @dots{}) 33## @deftypefnx {} {[@var{c}, @var{h}] =} contourf (@dots{}) 34## Create a 2-D contour plot with filled intervals. 35## 36## Plot level curves (contour lines) of the matrix @var{z} and fill the region 37## between lines with colors from the current colormap. 38## 39## The level curves are taken from the contour matrix @var{c} computed by 40## @code{contourc} for the same arguments; see the latter for their 41## interpretation. 42## 43## The appearance of contour lines can be defined with a line style @var{style} 44## in the same manner as @code{plot}. Only line style and color are used; 45## Any markers defined by @var{style} are ignored. 46## 47## If the first argument @var{hax} is an axes handle, then plot into this axes, 48## rather than the current axes returned by @code{gca}. 49## 50## The optional output @var{c} contains the contour levels in @code{contourc} 51## format. 52## 53## The optional return value @var{h} is a graphics handle to the hggroup 54## comprising the contour lines. 55## 56## The following example plots filled contours of the @code{peaks} function. 57## 58## @example 59## @group 60## [x, y, z] = peaks (50); 61## contourf (x, y, z, -7:9) 62## @end group 63## @end example 64## @seealso{ezcontourf, contour, contourc, contour3, clabel, meshc, surfc, caxis, colormap, plot} 65## @end deftypefn 66 67function [c, h] = contourf (varargin) 68 69 [hax, varargin] = __plt_get_axis_arg__ ("contour", varargin{:}); 70 71 oldfig = []; 72 if (! isempty (hax)) 73 oldfig = get (0, "currentfigure"); 74 endif 75 unwind_protect 76 hax = newplot (hax); 77 78 [ctmp, htmp] = __contour__ (hax, "none", "fill", "on", 79 "linecolor", "black", varargin{:}); 80 81 if (! ishold ()) 82 set (hax, "box", "on"); 83 endif 84 85 unwind_protect_cleanup 86 if (! isempty (oldfig)) 87 set (0, "currentfigure", oldfig); 88 endif 89 end_unwind_protect 90 91 if (nargout > 0) 92 c = ctmp; 93 h = htmp; 94 endif 95 96endfunction 97 98 99%!demo 100%! clf; 101%! colormap ("default"); 102%! [x, y, z] = peaks (50); 103%! contourf (x, y, z, -7:9); 104%! title ({"contourf() plot (filled contour lines)"; "Z = peaks()"}); 105 106%!demo 107%! clf; 108%! colormap ("default"); 109%! [theta, r] = meshgrid (linspace (0,2*pi,64), linspace (0,1,64)); 110%! [X, Y] = pol2cart (theta, r); 111%! Z = sin (2*theta) .* (1-r); 112%! contourf (X, Y, abs (Z), 10); 113%! title ({"contourf() plot"; "polar fcn: Z = sin (2*theta) * (1-r)"}); 114 115%!demo 116%! clf; 117%! colormap ("default"); 118%! x = linspace (-2, 2); 119%! [x, y] = meshgrid (x); 120%! z = sqrt (x.^2 + y.^2) ./ (x.^2 + y.^2 + 1); 121%! contourf (x, y, z, [0.4, 0.4]); 122%! title ("Hole should be filled with the background color"); 123