libplplot-dev 5.9.9-2ubuntu2 / usr / share / doc / libplplot11 / examples / c++ / x17.cc

//--------------------------------------------------------------------------
// $Id: x17.cc 11760 2011-06-01 19:29:11Z airwin $
//--------------------------------------------------------------------------
//
//--------------------------------------------------------------------------
// Copyright (C) 2004  Andrew Ross <andrewr@coriolis.greenend.org.uk>
// 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_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];

    // 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;

    for ( n = 0; n < nsteps; n++ )
    {
#ifdef PL_HAVE_USLEEP
        usleep( 10000 ); // 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 = plrandd() - 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
//--------------------------------------------------------------------------