/usr/share/doc/libplplot12/examples/c++/x17.cc is in libplplot-dev 5.10.0+dfsg2-0.1ubuntu2.
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// $Id: x17.cc 12832 2013-12-09 14:39:59Z 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 C++.
//--------------------------------------------------------------------------
#include "plc++demos.h"
#ifdef PL_HAVE_NANOSLEEP
# include <time.h>
#endif
#ifdef PL_HAVE_UNISTD_H
# include <unistd.h>
#else
# ifdef PL_HAVE_POLL
# include <poll.h>
# endif
#endif
#ifdef PL_USE_NAMESPACE
using namespace std;
#endif
class x17 {
public:
x17( int, const char ** );
private:
// Class data
plstream *pls;
public:
static PLINT pl_errcode;
static char errmsg[160];
};
PLINT x17::pl_errcode = 0;
char x17:: errmsg[160] = "";
x17::x17( int argc, const char ** argv )
{
PLINT id1, n, nsteps = 1000;
bool autoy, acc;
PLFLT y1, y2, y3, y4, ymin, ymax, xlab, ylab;
PLFLT t, tmin, tmax, tjump, dt, noise;
PLINT colbox, collab, colline[4], styline[4];
const char *legline[4];
#ifdef PL_HAVE_NANOSLEEP
struct timespec ts;
#endif
// plplot initialization
pls = new plstream();
// Parse and process command line arguments.
pls->parseopts( &argc, argv, PL_PARSE_FULL );
// 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 )
{
cout << errmsg << endl;
delete pls;
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;
#ifdef PL_HAVE_NANOSLEEP
ts.tv_sec = 0;
ts.tv_nsec = 10000000;
#endif
for ( n = 0; n < nsteps; n++ )
{
#ifdef PL_HAVE_NANOSLEEP
nanosleep( &ts, NULL ); // wait a little (10 ms) to simulate time elapsing
#else
# ifdef PL_HAVE_POLL
poll( 0, 0, 10 );
# else
{ int i; for ( i = 0; i < 1000000; i++ )
;
}
# endif
#endif
t = (double) n * dt;
noise = pls->randd() - 0.5;
y1 = y1 + noise;
y2 = sin( t * M_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 )
pls->stripa( id1, 0, t, y1 );
if ( n % 3 )
pls->stripa( id1, 1, t, y2 );
if ( n % 4 )
pls->stripa( id1, 2, t, y3 );
if ( n % 5 )
pls->stripa( id1, 3, t, y4 );
//pls->eop(); // use double buffer (-db on command line)
}
// Destroy strip chart and it's memory
pls->stripd( id1 );
delete pls;
}
int main( int argc, const char ** argv )
{
x17 *x = new x17( argc, argv );
delete x;
}
//--------------------------------------------------------------------------
// End of x17.cc
//--------------------------------------------------------------------------
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