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########################################################################
##
## Copyright (C) 2007-2025 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## 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
## <https://www.gnu.org/licenses/>.
##
########################################################################
function plotimages (d, nm, typ)
if (strcmp (typ , "txt"))
image_as_txt (d, nm);
return;
endif
set_graphics_toolkit ();
set_print_size ();
hide_output ();
outfile = fullfile (d, [nm "." typ]);
if (strcmp (typ, "png"))
set (groot, "defaulttextfontname", "*");
endif
if (strcmp (typ, "eps"))
d_typ = "-depsc2";
else
d_typ = ["-d", typ];
endif
if (strcmp (nm, "plot"))
x = -10:0.1:10;
plot (x, sin (x));
xlabel ("x");
ylabel ("sin (x)");
title ("Simple 2-D Plot");
print (outfile, d_typ);
elseif (strcmp (nm, "hist"))
randn ("state", 1);
hist (randn (10000, 1), 30);
xlabel ("Value");
ylabel ("Count");
title ("Histogram of 10,000 normally distributed random numbers");
print (outfile, d_typ);
elseif (strcmp (nm, "errorbar"))
rand ("state", 2);
x = 0:0.1:10;
y = sin (x);
lerr = 0.1 .* rand (size (x));
uerr = 0.1 .* rand (size (x));
errorbar (x, y, lerr, uerr);
axis ([0, 10, -1.1, 1.1]);
xlabel ("x");
ylabel ("sin (x)");
title ("Errorbar plot of sin (x)");
print (outfile, 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 (outfile, 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 (outfile, 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 (outfile, 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]);
xlabel ("x");
ylabel ("erf (x)");
title ("erf (x) with text annotation");
if (strcmp (typ, "pdf") && ! strcmp (graphics_toolkit, "gnuplot"))
text (0.65, 0.6175, ['$\displaystyle\leftarrow x = {2\over\sqrt{\pi}}'...
'\int_{0}^{x}e^{-t^2} dt = 0.6175$'],
"interpreter", "latex");
## Be very careful about modifying this. pdflatex expects to be in
## the same directory as the file it is operating on.
cd (make_absolute_filename (d));
print ([nm ".pdf"], "-dpdflatexstandalone");
[status, output] = system (["pdflatex " nm]);
if (status)
error ("plotimages: Failed to run pdflatex on <extended.pdf>");
endif
delete ([nm ".aux"], [nm "-inc.pdf"], [nm ".log"], [nm ".tex"]);
else
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']);
print (outfile, d_typ);
endif
elseif (strcmp (nm, "precisiondate"))
rand ("state", 1);
t = datenum (2020, 1, 1):(1/1440):datenum (2020, 1, 2);
x = -cos (2*pi*t) + rand (size (t)) / 10;
subplot (1, 2, 1);
plot (t, x);
datetick ("x");
xlabel ("serial date");
title ("problem");
subplot (1, 2, 2);
plot (t - 730485, x);
datetick ("x");
xlabel ("2000 years off");
title ("workaround");
# set wider aspect ratio
image_size = [8.25, 3.5]; # in inches, 5:2 format
border = 0; # For postscript use 50/72
set (gcf, "papersize", image_size + 2*border);
set (gcf, "paperposition", [border, border, image_size]);
print (outfile, d_typ);
else
error ("unrecognized plot requested");
endif
hide_output ();
endfunction
## This function no longer sets the graphics toolkit; That is now done
## automatically by C++ code which will ordinarily choose 'qt', but might
## choose gnuplot on older systems. Only a complete lack of plotting is a
## problem.
function set_graphics_toolkit ()
if (isempty (available_graphics_toolkits ()))
error ("no graphics toolkit available for plotting");
elseif (strcmp ("qt", graphics_toolkit ()))
## Use qt with QOffscreenSurface for plot
elseif (! strcmp ("gnuplot", graphics_toolkit ()))
if (! any (strcmp ("gnuplot", available_graphics_toolkits ())))
error ("no graphics toolkit available for offscreen plotting");
else
graphics_toolkit ("gnuplot");
endif
endif
endfunction
function set_print_size ()
image_size = [5.0, 3.5]; # in inches, 16:9 format
border = 0; # For postscript use 50/72
set (groot, "defaultfigurepapertype", "<custom>");
set (groot, "defaultfigurepaperorientation", "landscape");
set (groot, "defaultfigurepapersize", image_size + 2*border);
set (groot, "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, gnuplot can't pop
## output as it can the terminal type).
function hide_output ()
hf = figure (1, "visible", "off");
endfunction
## generate something for the texinfo @image command to process
function image_as_txt (d, nm)
fid = fopen (fullfile (d, [nm ".txt"]), "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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