/usr/share/doc/libplplot12/examples/java/x17.java is in libplplot-java 5.10.0-0ubuntu5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// $Id: x17.java 12240 2012-10-04 22:10:12Z andrewross $
//--------------------------------------------------------------------------
//
//--------------------------------------------------------------------------
// Copyright (C) 2004 Andrew Ross
// Copyright (C) 2004 Alan W. Irwin
//
// 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; version 2 of the License.
//
// 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
//--------------------------------------------------------------------------
//
//--------------------------------------------------------------------------
// Implementation of PLplot example 17 in Java.
//--------------------------------------------------------------------------
package plplot.examples;
import plplot.core.*;
import static plplot.core.plplotjavacConstants.*;
class x17 {
// Class data
PLStream pls = new PLStream();
// plerror is not implement in java at this time
static int pl_errcode = 0;
static String errmsg = null;
x17( String[] args )
{
int id1[] = new int[1];
int n, nsteps = 1000;
boolean autoy, acc;
double y1, y2, y3, y4, ymin, ymax, xlab, ylab;
double t, tmin, tmax, tjump, dt, noise;
int colbox, collab;
int colline[] = new int[4];
int styline[] = new int[4];
String legline[] = new String[4];
// Parse and process command line arguments.
pls.parseopts( args, PL_PARSE_FULL | PL_PARSE_NOPROGRAM );
// If db is used the plot is much more smooth. However, because of the
// async X behaviour, one does not have a real-time scripcharter.
// pls.setopt("db", "");
// pls.setopt("np", "");
// Specify some reasonable defaults for ymin and ymax
// The plot will grow automatically if needed (but not shrink)
ymin = -0.1;
ymax = 0.1;
// Specify initial tmin and tmax -- this determines length of window.
// Also specify maximum jump in t
// This can accomodate adaptive timesteps
tmin = 0.;
tmax = 10.;
tjump = 0.3; // percentage of plot to jump
// Axes options same as plbox.
// Only automatic tick generation and label placement allowed
// Eventually I'll make this fancier
colbox = 1;
collab = 3;
styline[0] = colline[0] = 2; // pens color and line style
styline[1] = colline[1] = 3;
styline[2] = colline[2] = 4;
styline[3] = colline[3] = 5;
legline[0] = "sum"; // pens legend
legline[1] = "sin";
legline[2] = "sin*noi";
legline[3] = "sin+noi";
xlab = 0.; ylab = 0.25; // legend position
autoy = true; // autoscale y
acc = true; // don't scrip, accumulate
// Initialize PLplot.
pls.init();
pls.adv( 0 );
pls.vsta();
// Register our error variables with PLplot
// From here on, we're handling all errors here
//pls.sError(&pl_errcode, errmsg);
pls.stripc( id1, "bcnst", "bcnstv",
tmin, tmax, tjump, ymin, ymax,
xlab, ylab,
autoy, acc,
colbox, collab,
colline, styline, legline,
"t", "", "Strip chart demo" );
if ( pl_errcode != 0 )
{
System.out.println( errmsg );
pls.end();
System.exit( 1 );
}
// Let plplot handle errors from here on
//pls.sError(NULL, NULL);
autoy = false; // autoscale y
acc = true; // accumulate/
// This is to represent a loop over time
// Let's try a random walk process
y1 = y2 = y3 = y4 = 0.0;
dt = 0.1;
for ( n = 0; n < nsteps; n++ )
{
try {
Thread.sleep( 10 );
}
catch ( InterruptedException e ) {
}
t = n * dt;
noise = pls.randd() - 0.5;
y1 = y1 + noise;
y2 = Math.sin( t * Math.PI / 18. );
y3 = y2 * noise;
y4 = y2 + noise / 3.;
// There is no need for all pens to have the same number of
// points or beeing equally time spaced.
if ( n % 2 != 0 )
pls.stripa( id1[0], 0, t, y1 );
if ( n % 3 != 0 )
pls.stripa( id1[0], 1, t, y2 );
if ( n % 4 != 0 )
pls.stripa( id1[0], 2, t, y3 );
if ( n % 5 != 0 )
pls.stripa( id1[0], 3, t, y4 );
// pls.eop(); // use double buffer (-db on command line)
}
// Destroy strip chart and it's memory
pls.stripd( id1[0] );
pls.end();
}
public static void main( String[] args )
{
new x17( args );
}
}
//--------------------------------------------------------------------------
// End of x17.java
//--------------------------------------------------------------------------
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