/usr/share/doc/libplplot12/examples/perl/x14.pl is in libplplot-dev 5.10.0+dfsg2-0.1ubuntu2.
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#
# Demo x14 for the PLplot PDL binding
#
# Demo of multiple stream/window capability (requires Tk or Tcl-DP).
#
# 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: x14c.c 1.26
use PDL;
use PDL::Graphics::PLplot;
use Math::Trig qw [pi];
my ($xscale, $yscale, $xoff, $yoff, $xs, $ys);
my $space1 = 1500; my $mark1 = 1500;
#--------------------------------------------------------------------------
# main
#
# Plots several simple functions from other example programs.
#
# This version sends the output of the first 4 plots (one page) to two
# independent streams.
#--------------------------------------------------------------------------
sub main {
my $xleng0 = 400; my $yleng0 = 300; my $xoff0 = 200; my $yoff0 = 200;
my $xleng1 = 400; my $yleng1 = 300; my $xoff1 = 500; my $yoff1 = 500;
# Select either TK or DP driver and use a small window
# Using DP results in a crash at the end due to some odd cleanup problems
# The geometry strings MUST be in writable memory
$geometry_master = "500x410+100+200";
$geometry_slave = "500x410+650+200";
# plplot initialization
# Parse and process command line arguments
plParseOpts (\@ARGV, PL_PARSE_SKIP | PL_PARSE_NOPROGRAM);
# If valid geometry specified on command line, use it for both streams.
my ($xp0, $yp0, $xleng0, $yleng0, $xoff0, $yoff0) = plgpage ();
#printf("%s %i, %i\n", "xleng0, yleng0 = ", $xleng0, $yleng0);
my $valid_geometry;
if ($xleng0 > 0 && $yleng0 > 0) {
$valid_geometry = 1;
} else {
$valid_geometry = 0;
}
#printf("%s %i\n", "valid_geometry = ", $valid_geometry);
# Set up first stream
if ($valid_geometry) {
plspage ($xp0, $yp0, $xleng0, $yleng0, $xoff0, $yoff0);
} else {
plsetopt ("geometry", $geometry_master);
}
plssub (2, 2);
plinit ();
my $driver = plgdev ();
my ($fam, $num, $bmax) = plgfam ();
print ("Demo of multiple output streams via the $driver driver.\n"
. "Running with the second stream as slave to the first.\n"
. "\n");
# Start next stream
plsstrm (1);
if ($valid_geometry) {
plspage ($xp0, $yp0, $xleng0, $yleng0, $xoff0, $yoff0);
} else {
plsetopt ("geometry", $geometry_slave);
}
# Turn off pause to make this a slave (must follow master)
plspause (0);
plsdev ($driver);
plsfam ($fam, $num, $bmax);
plsetopt ("fflen","2");
plinit ();
# Set up the data & plot
# Original case
plsstrm (0);
$xscale = 6.;
$yscale = 1.;
$xoff = 0.;
$yoff = 0.;
plot1 ();
# Set up the data & plot
$xscale = 1.;
$yscale = 1.e+6;
plot1 ();
# Set up the data & plot
$xscale = 1.;
$yscale = 1.e-6;
$digmax = 2;
plsyax ($digmax, 0);
plot1 ();
# Set up the data & plot
$xscale = 1.;
$yscale = 0.0014;
$yoff = 0.0185;
$digmax = 5;
plsyax ($digmax, 0);
plot1 ();
# To slave
# The pleop() ensures the eop indicator gets lit.
plsstrm (1);
plot4 ();
pleop ();
# Back to master
plsstrm (0);
plot2 ();
plot3 ();
# To slave
plsstrm (1);
plot5 ();
pleop ();
# Back to master to wait for user to advance
plsstrm (0);
pleop ();
# Call plend to finish off.
plend ();
}
# ===============================================================
sub plot1 {
my $x = $xoff + $xscale * (sequence (60) + 1) / 60;
my $y = $yoff + $yscale * $x ** 2;
my $xmin = $x->index (0);
my $xmax = $x->index (59);
my $ymin = $y->index (0);
my $ymax = $y->index (59);
my $i = sequence (6);
my $xs = $x->index ($i * 10 + 3);
my $ys = $y->index ($i * 10 + 3);
# Set up the viewport and window using PLENV. The range in X is
# 0.0 to 6.0, and the range in Y is 0.0 to 30.0. The axes are
# scaled separately (just = 0), and we just draw a labelled
# box (axis = 0).
plcol0 (1);
plenv ($xmin, $xmax, $ymin, $ymax, 0, 0);
plcol0 (6);
pllab ("(x)", "(y)", "#frPLplot Example 1 - y=x#u2");
# Plot the data points
plcol0 (9);
plpoin ($xs, $ys, 9);
# Draw the line through the data
plcol0 (4);
plline ($x, $y);
plflush ();
}
# ===============================================================
sub plot2 {
# Set up the viewport and window using PLENV. The range in X is -2.0 to
# 10.0, and the range in Y is -0.4 to 2.0. The axes are scaled separately
# ($just = 0), and we draw a box with axes (axis = 1).
plcol0 (1);
plenv (-2.0, 10.0, -0.4, 1.2, 0, 1);
plcol0 (2);
pllab ("(x)", "sin(x)/x", "#frPLplot Example 1 - Sinc Function");
# Fill up the arrays
my $i = sequence (100);
my $x = ($i - 19.0) / 6.0;
my $y = ones (100);
my $idx = which ($x);
$y->index ($idx) .= sin ($x->index ($idx)) / $x->index ($idx);
# Draw the line
plcol0 (3);
plline ($x, $y);
plflush ();
}
# ===============================================================
sub plot3 {
# For the final graph we wish to override the default tick intervals, and
# so do not use PLENV
pladv (0);
# Use standard viewport, and define X range from 0 to 360 degrees, Y range
# from -1.2 to 1.2.
plvsta ();
plwind (0.0, 360.0, -1.2, 1.2);
# Draw a box with ticks spaced 60 degrees apart in X, and 0.2 in Y.
plcol0 (1);
plbox (60.0, 2, 0.2, 2, "bcnst", "bcnstv");
# Superimpose a dashed line grid, with 1.5 mm marks and spaces.
plstyl ($mark1, $space1);
plcol0 (2);
plbox (30.0, 0, 0.2, 0, "g", "g");
plstyl (pdl ([]), pdl ([]));
plcol0 (3);
pllab ("Angle (degrees)", "sine", "#frPLplot Example 1 - Sine function");
my $i = sequence (101);
my $x = 3.6 * $i;
my $y = sin ($x * pi / 180);
plcol0 (4);
plline ($x, $y);
plflush ();
}
# ===============================================================
sub plot4 {
my $dtr = pi / 180;
my $i = sequence (361);
my $x0 = cos ($dtr * $i);
my $y0 = sin ($dtr * $i);
# Set up viewport and window, but do not draw box
plenv (-1.3, 1.3, -1.3, 1.3, 1, -2);
for my $i (1 .. 10) {
my $x = pdl (0.1 * $i * $x0);
my $y = pdl (0.1 * $i * $y0);
# Draw circles for polar grid
plline($x, $y);
}
plcol0 (2);
for my $i (0 .. 11) {
my $theta = 30 * $i;
my $dx = cos ($dtr * $theta);
my $dy = sin ($dtr * $theta);
# Draw radial spokes for polar grid
pljoin (0.0, 0.0, $dx, $dy);
my $text = sprintf ("%.0f", $theta);
# Write labels for angle
# Slightly off zero to avoid floating point logic flips at 90 and 270 deg.
if ($dx >= -0.00001) {
plptex ($dx, $dy, $dx, $dy, -0.15, $text);
} else {
plptex ($dx, $dy, -$dx, -$dy, 1.15, $text);
}
}
# Draw the graph
my $r = sin ($dtr * 5 * sequence(361));
$x = $x0 * $r;
$y = $y0 * $r;
plcol0 (3);
plline ($x, $y);
plcol0 (4);
plmtex (2.0, 0.5, 0.5,
"t", "#frPLplot Example 3 - r(#gh)=sin 5#gh");
plflush ();
}
# ===============================================================
# Demonstration of contour plotting
use constant XPTS => 35;
use constant YPTS => 46;
use constant XSPA => 2 / (XPTS - 1);
use constant YSPA => 2 / (YPTS - 1);
my @tr = (XSPA, 0.0, -1.0, 0.0, YSPA, -1.0);
sub mypltr {
my ($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);
}
my $ clevel = pdl [-1., -.8, -.6, -.4, -.2, 0, .2, .4, .6, .8, 1.];
sub plot5 {
my $mark = 1500; my $space = 1500;
my $xx = ((sequence (XPTS) - int(XPTS / 2)) / int(XPTS / 2))->dummy (1, YPTS);
my $yy = ((sequence (YPTS) - int(YPTS / 2))
/ int(YPTS / 2) - 1.0)->dummy (0, XPTS);
my $z = $xx * $xx - $yy * $yy;
my $w = 2 * $xx * $yy;
plenv (-1.0, 1.0, -1.0, 1.0, 0, 0);
plcol0 (2);
plcont ($z, 1, XPTS, 1, YPTS, $clevel, \&mypltr, 0);
plstyl ($mark, $space);
plcol0 (3);
plcont ($w, 1, XPTS, 1, YPTS, $clevel, \&mypltr, 0);
plcol0 (1);
pllab ("X Coordinate", "Y Coordinate", "Streamlines of flow");
plflush ();
}
main ();
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