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## Copyright (C) 2007-2013 John W. Eaton and David Bateman
##
## 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/>.
function plotimages (nm, typ)
graphics_toolkit ("gnuplot");
set_print_size ();
hide_output ();
if (strcmp (typ, "png"))
set (0, "defaulttextfontname", "*");
endif
if (strcmp (typ, "eps"))
d_typ = "-depsc2";
else
d_typ = ["-d", typ];
endif
if (strcmp(typ , "txt"))
image_as_txt(nm);
elseif (strcmp (nm, "plot"))
x = -10:0.1:10;
plot (x, sin (x));
xlabel ("x");
ylabel ("sin (x)");
title ("Simple 2-D Plot");
print ([nm "." typ], d_typ);
elseif (strcmp (nm, "hist"))
rand ("state", 2);
hist (randn (10000, 1), 30);
xlabel ("Value");
ylabel ("Count");
title ("Histogram of 10,000 normally distributed random numbers");
print ([nm "." typ], d_typ);
elseif (strcmp (nm, "errorbar"))
rand ("state", 2);
x = 0:0.1:10;
y = sin (x);
yl = 0.1 .* rand (size (x));
yu = 0.1 .* rand (size (x));
errorbar (x, sin (x), yl, yu);
axis ([0, 10, -1.1, 1.1]);
xlabel ("x");
ylabel ("sin (x)");
title ("Errorbar plot of sin (x)");
print ([nm "." typ], d_typ);
elseif (strcmp (nm, "polar"))
polar (0:0.1:10*pi, 0:0.1:10*pi);
title ("Example polar plot from 0 to 10*pi");
print ([nm "." typ], d_typ);
elseif (strcmp (nm, "mesh"))
tx = ty = linspace (-8, 8, 41)';
[xx, yy] = meshgrid (tx, ty);
r = sqrt (xx .^ 2 + yy .^ 2) + eps;
tz = sin (r) ./ r;
mesh (tx, ty, tz);
xlabel ("tx");
ylabel ("ty");
zlabel ("tz");
title ("3-D Sombrero plot");
print ([nm "." typ], d_typ);
elseif (strcmp (nm, "plot3"))
t = 0:0.1:10*pi;
r = linspace (0, 1, numel (t));
z = linspace (0, 1, numel (t));
plot3 (r.*sin(t), r.*cos(t), z);
xlabel ("r.*sin (t)");
ylabel ("r.*cos (t)");
zlabel ("z");
title ("plot3 display of 3-D helix");
print ([nm "." typ], d_typ);
elseif (strcmp (nm, "extended"))
x = 0:0.01:3;
plot (x,erf(x));
hold on;
plot (x,x,"r");
axis ([0, 3, 0, 1]);
text (0.65, 0.6175, ['\leftarrow x = {2/\surd\pi {\fontsize{16}' ...
'\int_{\fontsize{8}0}^{\fontsize{8}x}} e^{-t^2} dt} = 0.6175']);
xlabel ("x");
ylabel ("erf (x)");
title ("erf (x) with text annotation");
print ([nm "." typ], d_typ);
else
error ("unrecognized plot requested");
endif
hide_output ();
endfunction
function set_print_size ()
image_size = [5.0, 3.5]; # in inches, 16:9 format
border = 0; # For postscript use 50/72
set (0, "defaultfigurepapertype", "<custom>");
set (0, "defaultfigurepaperorientation", "landscape");
set (0, "defaultfigurepapersize", image_size + 2*border);
set (0, "defaultfigurepaperposition", [border, border, image_size]);
endfunction
## Use this function before plotting commands and after every call to
## print since print() resets output to stdout (unfortunately, gnpulot
## can't pop output as it can the terminal type).
function hide_output ()
f = figure (1);
set (f, "visible", "off");
endfunction
## generate something for the texinfo @image command to process
function image_as_txt(nm)
fid = fopen (sprintf ("%s.txt", nm), "wt");
fputs (fid, "\n");
fputs (fid, "+---------------------------------+\n");
fputs (fid, "| Image unavailable in text mode. |\n");
fputs (fid, "+---------------------------------+\n");
fclose (fid);
endfunction
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