/usr/share/doc/libplplot11/examples/perl/x16.pl is in libplplot-dev 5.9.9-2ubuntu2.
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#
# Demo x16 for the PLplot PDL binding
#
# plshade demo, using color fill
#
# 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: x16c.c 1.26
use PDL;
use PDL::Graphics::PLplot;
use Math::Trig qw [pi];
use Getopt::Long qw(:config pass_through);
use Text::Wrap;
$Text::Wrap::columns = 72;
# Fundamental settings. See @notes for more info.
use constant ns => 20; # Default number of shade levels
use constant nx => 35; # Default number of data points in x
use constant ny => 46; # Default number of data points in y
use constant exclude => 0; # By default do not plot a page illustrating
# exclusion. API is probably going to change
# anyway, and cannot be reproduced by any
# front end other than the C one.
# polar plot data
use constant PERIMETERPTS => 100;
# Transformation function
my @tr;
sub mypltr {
my ($x, $y) = @_;
my $tx = $tr[0] * $x + $tr[1] * $y + $tr[2];
my $ty = $tr[3] * $x + $tr[4] * $y + $tr[5];
return ($tx, $ty);
}
# --------------------------------------------------------------------------
# f2mnmx
#
# Returns min & max of input 2d array.
# --------------------------------------------------------------------------
sub f2mnmx {
my $f = shift;
my $fmin = min ($f);
my $fmax = max ($f);
return ($fmin, $fmax);
}
sub zdefined {
my ($x, $y) = @_;
my $z = sqrt ($x * $x + $y * $y);
return ($z < 0.4 or $z > 0.6);
}
my @notes = (
"To get smoother color variation, increase ns, nx, and ny. To get faster",
"response (especially on a serial link), decrease them. A decent but quick",
"test results from ns around 5 and nx, ny around 25."
);
# --------------------------------------------------------------------------
# main
#
# Does several shade plots using different coordinate mappings.
# --------------------------------------------------------------------------
my $fill_width = 2;
my $cont_color = 0;
my $cont_width = 0;
# Parse and process command line arguments
my ($exclude, $ns, $nx, $ny, $help);
$exclude = exclude;
$ns = ns;
$nx = nx;
$ny = ny;
GetOptions ("exclude" => \$exclude,
"ns=i" => \$ns,
"nx=i" => \$nx,
"ny=i" => \$ny,
"help" => \$help);
if ($help) {
print (<<EOT);
$0 options:
--exclude Plot the "exclusion" page.
--ns levels Sets number of shade levels
--nx xpts Sets number of data points in x
--ny ypts Sets number of data points in y
EOT
print (wrap ('', '', @notes), "\n");
push (@ARGV, "-h");
}
unshift (@ARGV, $0);
plParseOpts (\@ARGV, PL_PARSE_PARTIAL);
# Load colour palettes
plspal0( "cmap0_black_on_white.pal" );
plspal1( "cmap1_gray.pal", 1 );
# Reduce colors in cmap 0 so that cmap 1 is useful on a 16-color display
plscmap0n (3);
# Initialize plplot
plinit ();
# Set up transformation function
@tr = (2 / ($nx - 1), 0.0, -1.0, 0.0, 2 / ($ny - 1), -1.0);
my $x = ((sequence ($nx) - int($nx / 2)) / int($nx / 2))->dummy (1, $ny);
my $y = ((sequence ($ny) - int($ny / 2)) / int($ny / 2) - 1.0)->dummy (0, $nx);;
my $z = -sin (7 * $x) * cos (7 * $y) + $x ** 2 - $y ** 2;
my $w = -cos (7 * $x) * sin (7 * $y) + 2 * $x * $y;
my ($zmin, $zmax) = f2mnmx ($z);
my $clevel = $zmin + ($zmax - $zmin) * (sequence ($ns) + 0.5) / $ns;
my $shedge = $zmin + ($zmax - $zmin) * sequence ($ns + 1) / $ns;
# Set up coordinate grids
my $distort = 0.4;
my $vx = sequence ($nx);
my $vy = sequence ($ny);
my ($x, $y) = mypltr ($vx->dummy (1, $ny), $vy->dummy (0, $nx));
my $xx = $x->slice (',0')->squeeze ();
my $yy = $y->slice ('0,')->squeeze ();
my $argx = $xx * pi / 2;
my $argy = $yy * pi / 2;
my $cgrid1 = plAllocGrid ($xx + $distort * cos ($argx),
$yy - $distort * cos ($argy));
my $argx = $x * pi / 2;
my $argy = $y * pi / 2;
my $cgrid2 = plAlloc2dGrid ($x + $distort * cos ($argx) * cos ($argy),
$y - $distort * cos ($argx) * cos ($argy));
# Plot using identity transform
pladv (0);
plvpor (0.1, 0.9, 0.1, 0.9);
plwind (-1.0, 1.0, -1.0, 1.0);
plpsty (0);
plshades ($z, -1., 1., -1., 1., $shedge, $fill_width,
$cont_color, $cont_width, 1, 0, 0, 0);
plcol0 (1);
plbox (0.0, 0, 0.0, 0, "bcnst", "bcnstv");
plcol0 (2);
pllab ("distance", "altitude", "Bogon density");
# Plot using 1d coordinate transform
# Load colour palettes
plspal0( "cmap0_black_on_white.pal" );
plspal1( "cmap1_blue_yellow.pal", 1 );
# Reduce colors in cmap 0 so that cmap 1 is useful on a 16-color display
plscmap0n( 3 );
pladv (0);
plvpor (0.1, 0.9, 0.1, 0.9);
plwind (-1.0, 1.0, -1.0, 1.0);
plpsty (0);
plshades ($z, -1., 1., -1., 1., $shedge, $fill_width,
$cont_color, $cont_width, 1, 0, \&pltr1, $cgrid1);
plcol0 (1);
plbox (0.0, 0, 0.0, 0, "bcnst", "bcnstv");
plcol0 (2);
pllab ("distance", "altitude", "Bogon density");
# Plot using 2d coordinate transform
# Load colour palettes
plspal0( "cmap0_black_on_white.pal" );
plspal1( "cmap1_blue_red.pal", 1 );
# Reduce colors in cmap 0 so that cmap 1 is useful on a 16-color display
plscmap0n( 3 );
pladv (0);
plvpor (0.1, 0.9, 0.1, 0.9);
plwind (-1.0, 1.0, -1.0, 1.0);
plpsty (0);
plshades ($z, -1., 1., -1., 1., $shedge, $fill_width,
$cont_color, $cont_width, 0, 0, \&pltr2, $cgrid2);
plcol0 (1);
plbox (0.0, 0, 0.0, 0, "bcnst", "bcnstv");
plcol0 (2);
plcont ($w, 1, $nx, 1, $ny, $clevel, \&pltr2, $cgrid2);
pllab ("distance", "altitude", "Bogon density, with streamlines");
# Plot using 2d coordinate transform
# Load colour palettes
plspal0( "" );
plspal1( "", 1 );
# Reduce colors in cmap 0 so that cmap 1 is useful on a 16-color display
plscmap0n( 3 );
pladv (0);
plvpor (0.1, 0.9, 0.1, 0.9);
plwind (-1.0, 1.0, -1.0, 1.0);
plpsty (0);
plshades ($z, -1., 1., -1., 1., $shedge, $fill_width,
2, 3, 0, 0, \&pltr2, $cgrid2);
plcol0 (1);
plbox (0.0, 0, 0.0, 0, "bcnst", "bcnstv");
plcol0 (2);
pllab("distance", "altitude", "Bogon density");
# Plot using 2d coordinate transform and exclusion
if ($exclude) {
pladv (0);
plvpor (0.1, 0.9, 0.1, 0.9);
plwind (-1.0, 1.0, -1.0, 1.0);
plpsty (0);
plshades ($z, -1., 1., -1., 1., $shedge, $fill_width,
$cont_color, $cont_width, 1,
\&zdefined, \&pltr2, $cgrid2);
plcol0 (1);
plbox (0.0, 0, 0.0, 0, "bcnst", "bcnstv");
pllab ("distance", "altitude", "Bogon density with exclusion");
}
plFreeGrid ($cgrid1);
plFree2dGrid ($cgrid2);
# Example with polar coordinates
# Load colour palettes
plspal0( "cmap0_black_on_white.pal" );
plspal1( "cmap1_gray.pal", 1 );
# Reduce colors in cmap 0 so that cmap 1 is useful on a 16-color display
plscmap0n( 3 );
pladv (0);
plvpor (.1, .9, .1, .9);
plwind (-1., 1., -1., 1.);
plpsty (0);
# Build new coordinate matrices
my $r = (sequence ($nx) / ($nx - 1))->dummy (1, $ny);
my $t = ((2 * pi * sequence ($ny) / ($ny - 1))->dummy (0, $nx));
$cgrid2 = plAlloc2dGrid ($r * cos ($t), $r * sin ($t));
$z = exp (- $r ** 2) * cos (5 * pi * $r) * cos (5 * $t);
# Need a new shedge to go along with the new data set
($zmin, $zmax) = f2mnmx ($z);
$shedge = $zmin + ($zmax - $zmin) * sequence ($ns+1) / $ns;
# Now we can shade the interior region
plshades ($z, -1., 1., -1., 1., $shedge, $fill_width,
$cont_color, $cont_width, 0, 0, \&pltr2, $cgrid2);
# Now we can draw the perimeter. (If do before, shade stuff may overlap.)
$t = (2 * pi / (PERIMETERPTS - 1)) * sequence (PERIMETERPTS);
my $px = cos ($t);
my $py = sin ($t);
plcol0 (1);
plline ($px, $py);
# And label the plot
plcol0 (2);
pllab ("", "", "Tokamak Bogon Instability");
plend ();
plFree2dGrid ($cgrid2);
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