Mercurial > octave
view scripts/plot/draw/cylinder.m @ 22302:1c4cd12987f5
Use Octave syntax in graphics demos.
* inputdlg.m, listdlg.m, waitbar.m, autumn.m, bone.m, cool.m, copper.m,
cubehelix.m, flag.m, gray.m, hot.m, hsv.m, jet.m, lines.m, ocean.m, pink.m,
prism.m, rainbow.m, rgbplot.m, spring.m, summer.m, viridis.m, white.m,
winter.m, annotation.m, axis.m, clabel.m, daspect.m, datetick.m, grid.m,
legend.m, lighting.m, material.m, pbaspect.m, shading.m, text.m, xlim.m,
ylim.m, zlim.m, area.m, bar.m, barh.m, camlight.m, colorbar.m, comet.m,
comet3.m, contour.m, contour3.m, contourf.m, cylinder.m, ellipsoid.m,
errorbar.m, ezcontour.m, ezcontourf.m, ezmesh.m, ezmeshc.m, ezplot.m,
ezplot3.m, ezsurf.m, ezsurfc.m, feather.m, fill.m, fplot.m, isocaps.m,
isonormals.m, isosurface.m, light.m, line.m, loglog.m, loglogerr.m, mesh.m,
meshc.m, meshz.m, pareto.m, patch.m, pcolor.m, pie.m, pie3.m, plot.m, plot3.m,
plotmatrix.m, plotyy.m, polar.m, quiver.m, quiver3.m, rectangle.m, ribbon.m,
rose.m, scatter.m, scatter3.m, semilogx.m, semilogxerr.m, semilogy.m,
semilogyerr.m, shrinkfaces.m, slice.m, smooth3.m, sombrero.m, stairs.m, stem.m,
stem3.m, stemleaf.m, surf.m, surfc.m, surfl.m, surfnorm.m, tetramesh.m,
trimesh.m, triplot.m, trisurf.m, waterfall.m, copyobj.m, hold.m, linkaxes.m,
linkprop.m, printd.m, refreshdata.m, subplot.m, zoom.m, pcr.m, dump_demos.m:
Use Octave syntax in graphics demos.
author | Rik <rik@octave.org> |
---|---|
date | Mon, 15 Aug 2016 15:15:30 -0700 |
parents | 516bb87ea72e |
children | bac0d6f07a3e |
line wrap: on
line source
## Copyright (C) 2007-2015 Michael Goffioul and Kai Habel ## ## This file is part of Octave. ## ## Octave 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. ## ## Octave 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 Octave; see the file COPYING. If not, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {} {} cylinder ## @deftypefnx {} {} cylinder (@var{r}) ## @deftypefnx {} {} cylinder (@var{r}, @var{n}) ## @deftypefnx {} {} cylinder (@var{hax}, @dots{}) ## @deftypefnx {} {[@var{x}, @var{y}, @var{z}] =} cylinder (@dots{}) ## Plot a 3-D unit cylinder. ## ## The optional input @var{r} is a vector specifying the radius along the ## unit z-axis. The default is [1 1] indicating radius 1 at @code{Z == 0} ## and at @code{Z == 1}. ## ## The optional input @var{n} determines the number of faces around the ## circumference of the cylinder. The default value is 20. ## ## If the first argument @var{hax} is an axes handle, then plot into this axis, ## rather than the current axes returned by @code{gca}. ## ## If outputs are requested @code{cylinder} returns three matrices in ## @code{meshgrid} format, such that @code{surf (@var{x}, @var{y}, @var{z})} ## generates a unit cylinder. ## ## Example: ## ## @example ## @group ## [x, y, z] = cylinder (10:-1:0, 50); ## surf (x, y, z); ## title ("a cone"); ## @end group ## @end example ## @seealso{ellipsoid, rectangle, sphere} ## @end deftypefn function [xx, yy, zz] = cylinder (varargin) [hax, args, nargs] = __plt_get_axis_arg__ ("cylinder", varargin{:}); if (nargs == 0) r = [1, 1]; n = 20; elseif (nargs == 1) r = args{1}; n = 20; elseif (nargs == 2) r = args{1}; n = args{2}; else print_usage (); endif if (length (r) < 2) error ("cylinder: length (R) must be larger than 2"); endif phi = linspace (0, 2*pi, n+1); idx = 1:length (r); [phi, idx] = meshgrid (phi, idx); z = (idx - 1) / (length (r) - 1); r = r(idx); [x, y] = pol2cart (phi, r); if (nargout > 0) xx = x; yy = y; zz = z; else oldfig = []; if (! isempty (hax)) oldfig = get (0, "currentfigure"); endif unwind_protect hax = newplot (hax); surf (x, y, z); unwind_protect_cleanup if (! isempty (oldfig)) set (0, "currentfigure", oldfig); endif end_unwind_protect endif endfunction %!demo %! clf; %! colormap ("default"); %! [x, y, z] = cylinder (10:-1:0, 50); %! surf (x, y, z); %! title ("cylinder() with linearly shrinking radius produces a cone");