/usr/share/doc/libplplot12/examples/perl/x20.pl is in libplplot-dev 5.10.0+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Demo x20 for the PLplot PDL binding
#
# plimage demo
#
# Copyright (C) 2004 Rafael Laboissiere
#
# This file is part of PLplot.
#
# PLplot is free software; you can redistribute it and/or modify
# it under the terms of the GNU Library General Public License as published
# by the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# PLplot 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 Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public License
# along with PLplot; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
# SYNC: x20c.c 1.16
use PDL;
use PDL::Graphics::PLplot;
use PDL::IO::Pnm;
use Math::Trig qw [pi];
use Getopt::Long qw(:config pass_through);
use Text::Wrap;
$Text::Wrap::columns = 72;
use constant XDIM => 260;
use constant YDIM => 220;
sub main {
my $dbg = 0;
my $nosombrero = 0;
my $nointeractive = 0;
my $f_name = "";
GetOptions ("dbg" => \$dbg,
"nosombrero" => \$nosombrero,
"nointeractive" => \$nointeractive,
"save=s" => \$f_name,
"help" => \$help);
if ($help) {
print (<<EOT);
$0 options:
--dbg Extra debugging plot
--nosombrero No sombrero plot
--nointeractive No interactive selection
--save filename Save sombrero plot in color postscript 'filename'
EOT
print (wrap ('', '', @notes), "\n");
push (@ARGV, "-h");
}
unshift (@ARGV, $0);
# Parse and process command line arguments
plParseOpts (\@ARGV, PL_PARSE_PARTIAL);
# Initialize plplot
plinit ();
# view image border pixels
if ($dbg) {
plenv (1, XDIM, 1, YDIM, 1, 1); # no plot box
# build a one pixel square border, for diagnostics
my $z = zeroes (XDIM, YDIM);
$z->slice (":," . (YDIM - 1)) .= 1; # right
$z->slice (":,0") .= 1; # left
$z->slice ("0,:") .= 1; # top
$z->slice ((XDIM - 1) . ",:") .= 1; # botton
pllab ("...around a blue square."," ","A red border should appear...");
plimage ($z, 1, XDIM, 1, YDIM, 0, 0, 1, XDIM, 1, YDIM);
}
# sombrero-like demo
if (not $nosombrero) {
plcol0 (2); # draw a yellow plot box, useful for diagnostics! :(
plenv (0., 2 * pi, 0, 3 * pi, 1, -1);
my $x = (2 * pi * sequence (XDIM) / (XDIM - 1))->dummy (1, YDIM);
my $y = (3 * pi * sequence (YDIM) / (YDIM - 1))->dummy (0, XDIM);;
my $r = sqrt ($x ** 2 + $y ** 2) + 1e-3;
my $z = sin ($r) / ($r);
pllab ("No, an amplitude clipped \"sombrero\"", "", "Saturn?");
plptex (2, 2, 3, 4, 0, "Transparent image");
plimage ($z, 0, 2 * pi, 0, 3 * pi, 0.05, 1, 0, 2 * pi, 0, 3 * pi);
# save the plot
save_plot ($f_name)
if $f_name;
}
# read Lena image
my $lena = "lena.pgm";
my ($img_f, $width, $height, $num_col) = read_img ($lena);
if ($width == 0 && $height == 0) {
my $lena = "../lena.pgm";
($img_f, $width, $height, $num_col) = read_img ($lena);
if ($width == 0 && $height == 0) {
die "Cannot find image file $lena";
}
}
# set gray colormap
gray_cmap ($num_col);
# display Lena
plenv (1, $width, 1, $height, 1, -1);
pllab (((not $nointeractive)
? "Set and drag Button 1 to (re)set selection, Button 2 to finish."
: ""), " ", "Lena...");
plimage ($img_f, 1, $width, 1, $height, 0, 0, 1, $width, 1, $height);
# selection/expansion demo
if (not $nointeractive) {
$xi = 200;
$xe = 330;
$yi = 280;
$ye = 220;
if (get_clip (\$xi, \$xe, \$yi, \$ye)) { # get selection rectangle
plend ();
exit (0);
}
plspause (0);
pladv (0);
# display selection only
plimage ($img_f, 1, $width, 1, $height, 0, 0, $xi, $xe, $ye, $yi);
plspause (1);
# zoom in selection
plenv ($xi, $xe, $ye, $yi, 1, -1);
plimage ($img_f, 1, $width, 1, $height, 0, 0, $xi, $xe, $ye, $yi);
}
# Base the dynamic range on the image contents.
my ($img_min, $img_max) = $img_f->minmax;
# Draw a saturated version of the original image. Only use the middle 50%
# of the image's full dynamic range.
plcol0(2);
plenv(0, $width, 0, $height, 1, -1);
pllab("", "", "Reduced dynamic range image example");
plimagefr($img_f, 0, $width, 0, $height, 0, 0,
$img_min + $img_max * 0.25, $img_max - $img_max * 0.25, 0, 0);
# Draw a distorted version of the original image, showing its full dynamic range.
plenv(0, $width, 0, $height, 1, -1);
pllab("", "", "Distorted image example");
my $stretch = [0, $width, 0, $height, 0.5];
# both xmap and ymap are 2D
my ($xmap, $ymap) = mypltr(sequence($width+1), sequence($height+1), $stretch);
my $grid = plAlloc2dGrid ($xmap, $ymap); # set of 2 2D maps
plimagefr($img_f, 0, $width, 0, $height, 0, 0, $img_min, $img_max, \&pltr2, $grid);
plFree2dGrid ($grid);
plend ();
}
# set up 2D transformation matrices
sub mypltr {
my ($x, $y, $stretch) = @_; # pdl, pdl, listref
my $pi = atan2(1,1)*4;
my $x0 = ($stretch->[0] + $stretch->[1])*0.5;
my $y0 = ($stretch->[2] + $stretch->[3])*0.5;
my $dy = ($stretch->[3] - $stretch->[2])*0.5;
my $result0 = $x0 + outer(($x0-$x),(1.0 - $stretch->[4]*cos(($y-$y0)/$dy*$pi*0.5)));
my $result1 = outer(ones($x->nelem),$y);
return ($result0, $result1);
}
# set gray colormap
sub gray_cmap {
my $num_col = shift;
my $r = pdl [0, 1];
my $g = pdl [0, 1];
my $b = pdl [0, 1];
my $pos = pdl [0, 1];
plscmap1n ($num_col);
plscmap1l (1, $pos, $r, $g, $b, pdl ([]));
}
# read image from file in PGN format
sub read_img {
my $fname = shift;
if (-r $fname) {
my $img = rpnm ($fname);
# We want the number of colours from the header, not the maximum
# colour. We can't get this via PDL, so hard code it to 255.
#return ($img, $img->dims (), $img->max);
return ($img, $img->dims (), 255);
}
else {
return (0,0,0,0);
}
}
# Get selection square interactively
sub get_clip {
my ($xi, $xe, $yi, $ye) = @_;
my $xxi = $$xi;
my $yyi = $$yi;
my $xxe = $$xe;
my $yye = $$ye;
my $start = 0;
my $st = plxormod (1); # enter xor mode to draw a selection rectangle
if ($st) { # driver has xormod capability, continue
my $sx = zeroes (5);
my $sy = zeroes (5);
while (1) {
plxormod (0);
my %gin = plGetCursor ();
plxormod (1);
if ($gin{button} == 1) {
$xxi = $gin{wX};
$yyi = $gin{wY};
plline ($sx, $sy) # clear previous rectangle
if $start;
$start = 0;
$sx->index (0) .= $xxi;
$sy->index (0) .= $yyi;
$sx->index (4) .= $xxi;
$sy->index (4) .= $yyi;
}
if ($gin{state} & 0x100) {
$xxe = $gin{wX};
$yye = $gin{wY};
plline ($sx, $sy) # clear previous rectangle
if ($start);
$start = 1;
$sx->index (1) .= $xxe;
$sx->index (2) .= $xxe;
$sx->index (3) .= $xxi;
$sy->index (1) .= $yyi;
$sy->index (2) .= $yye;
$sy->index (3) .= $yye;
plline ($sx, $sy); # draw new rectangle
}
if ($gin{button} == 3 or $gin{keysym} == PLK_Return
or $gin{keysym} eq 'Q') {
plline ($sx, $sy) # clear previous rectangle
if ($start);
last;
}
}
plxormod (0); # leave xor mod
if ($xxe < $xxi) {
my $t = $xxi;
$xxi = $xxe;
$xxe = $t;
}
if ($yyi < $yye) {
my $t = $yyi;
$yyi = $yye;
$yye = $t;
}
$$xe = $xxe;
$$xi = $xxi;
$$ye = $yye;
$$yi = $yyi;
return ($gin{keysym} eq 'Q');
}
return 0;
}
# save plot
sub save_plot {
my $fname = shift;
my $cur_strm = plgstrm (); # get current stream
my $new_strm = plmkstrm (); # create a new one
plsdev ("psc"); # new device type. Use a known existing driver
plsfnam ($fname); # file name
plcpstrm ($cur_strm, 0); # copy old stream parameters to new stream
plreplot (); # do the save
plend1 (); # close new device
plsstrm ($cur_strm); # and return to previous one
}
main ();
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