libplplot-dev 5.9.9-2ubuntu2 / usr / share / doc / libplplot11 / examples / c++ / x14.cc

//--------------------------------------------------------------------------
// $Id: x14.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 14 in C++.
//--------------------------------------------------------------------------

#include "plc++demos.h"

#ifdef PL_USE_NAMESPACE
using namespace std;
#endif

class x14 {
public:
    x14( int, const char ** );
    void plot1( plstream * );
    void plot2( plstream * );
    void plot3( plstream * );
    void plot4( plstream * );
    void plot5( plstream * );
    static void mypltr( PLFLT, PLFLT, PLFLT *, PLFLT *, void * );
private:
    // Class data
    plstream           *pls1, *pls2;

    PLFLT              x[101], y[101];
    PLFLT              xscale, yscale, xoff, yoff, xs[6], ys[6];
    static PLINT       space0, mark0, space1, mark1;

    static const int   xpts, ypts;
    static const PLFLT xspa, yspa;
    static const PLFLT tr[6];
};

PLINT x14::space0 = 0, x14::mark0 = 0,
x14::space1       = 1500, x14::mark1 = 1500;

const int   x14::  xpts = 35;
const int   x14::  ypts = 46;
const PLFLT x14::xspa   = 2. / ( x14::xpts - 1 );
const PLFLT x14::yspa   = 2. / ( x14::ypts - 1 );

const PLFLT x14::tr[6] =
{ x14::xspa, 0.0, -1.0, 0.0, x14::yspa, -1.0 };

void x14::mypltr( PLFLT x, PLFLT y, PLFLT *tx, PLFLT *ty, void *pltr_data )
{
    *tx = tr[0] * x + tr[1] * y + tr[2];
    *ty = tr[3] * x + tr[4] * y + tr[5];
}

static PLFLT clevel[11] =
{ -1., -.8, -.6, -.4, -.2, 0, .2, .4, .6, .8, 1. };



//--------------------------------------------------------------------------
// x14()
//
// Plots several simple functions from other example programs.
//
// This version sends the output of the first 4 plots (one page) to two
// independent streams.
//--------------------------------------------------------------------------
x14::x14( int argc, const char ** argv )
{
    int digmax;

    // 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

    char       driver[80] = "";

    PLINT      fam, num, bmax;

    const char geometry_master[] = "500x410+100+200";
    const char geometry_slave[]  = "500x410+650+200";

    PLFLT      xp0, yp0;
    PLINT      xleng0, yleng0, xoff0, yoff0;
    int        valid_geometry;

    // plplot initialization

    pls1 = new plstream();

    // Parse and process command line arguments.
    pls1->parseopts( &argc, argv, PL_PARSE_FULL );

    //If valid geometry specified on command line, use it for both streams.
    pls1->gpage( xp0, yp0, xleng0, yleng0, xoff0, yoff0 );
    valid_geometry = ( xleng0 > 0 && yleng0 > 0 );

    // Set up first stream

    if ( valid_geometry )
        pls1->spage( xp0, yp0, xleng0, yleng0, xoff0, yoff0 );
    else
        pls1->setopt( "geometry", geometry_master );

    pls1->ssub( 2, 2 );

    // Initialize PLplot.
    pls1->init();

    pls1->gdev( driver );
    pls1->gfam( fam, num, bmax );

    cout << "Demo of multiple output streams via the " <<
    driver << " driver." << endl;
    cout << "Running with the second stream as slave to the first.\n" << endl;

    pls2 = new plstream();

    if ( valid_geometry )
        pls2->spage( xp0, yp0, xleng0, yleng0, xoff0, yoff0 );
    else
        pls2->setopt( "geometry", geometry_slave );

    // Turn off pause to make this a slave (must follow master)
    pls2->spause( false );
    pls2->sdev( driver );
    pls2->sfam( fam, num, bmax );
    // Currently number of digits in format number can only be
    // set via the command line option
    pls2->setopt( "fflen", "2" );
    pls2->init();

    // Set up the data & plot
    // Original case

    xscale = 6.;
    yscale = 1.;
    xoff   = 0.;
    yoff   = 0.;
    plot1( pls1 );

    // Set up the data & plot

    xscale = 1.;
    yscale = 1.e+6;
    plot1( pls1 );

    // Set up the data & plot

    xscale = 1.;
    yscale = 1.e-6;
    digmax = 2;
    pls1->syax( digmax, 0 );
    plot1( pls1 );

    // Set up the data & plot

    xscale = 1.;
    yscale = 0.0014;
    yoff   = 0.0185;
    digmax = 5;
    pls1->syax( digmax, 0 );
    plot1( pls1 );

    // To slave
    // The eop() ensures the eop indicator gets lit.

    plot4( pls2 );
    pls2->eop();

    // Back to master

    plot2( pls1 );
    plot3( pls1 );

    // To slave

    plot5( pls2 );
    pls2->eop();

    // Back to master to wait for user to advance

    pls1->eop();

    delete pls1;
    delete pls2;
}

//--------------------------------------------------------------------------

void x14::plot1( plstream *pls )
{
    int   i;
    PLFLT xmin, xmax, ymin, ymax;

    for ( i = 0; i < 60; i++ )
    {
        x[i] = xoff + xscale * ( i + 1 ) / 60.0;
        y[i] = yoff + yscale * pow( (double) x[i], 2. );
    }

    xmin = x[0];
    xmax = x[59];
    ymin = y[0];
    ymax = y[59];

    for ( i = 0; i < 6; i++ )
    {
        xs[i] = x[i * 10 + 3];
        ys[i] = y[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).

    pls->col0( 1 );
    pls->env( xmin, xmax, ymin, ymax, 0, 0 );
    pls->col0( 6 );
    pls->lab( "(x)", "(y)", "#frPLplot Example 1 - y=x#u2" );

// Plot the data points

    pls->col0( 9 );
    pls->poin( 6, xs, ys, 9 );

// Draw the line through the data

    pls->col0( 4 );
    pls->line( 60, x, y );
    pls->flush();
}


//--------------------------------------------------------------------------

void x14::plot2( plstream *pls )
{
    int i;

// 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).

    pls->col0( 1 );
    pls->env( -2.0, 10.0, -0.4, 1.2, 0, 1 );
    pls->col0( 2 );
    pls->lab( "(x)", "sin(x)/x", "#frPLplot Example 1 - Sinc Function" );

// Fill up the arrays

    for ( i = 0; i < 100; i++ )
    {
        x[i] = ( i - 19.0 ) / 6.0;
        y[i] = 1.0;
        if ( x[i] != 0.0 )
            y[i] = sin( x[i] ) / x[i];
    }

// Draw the line

    pls->col0( 3 );
    pls->line( 100, x, y );
    pls->flush();
}

//--------------------------------------------------------------------------

void x14::plot3( plstream *pls )
{
    int i;

// For the final graph we wish to override the default tick intervals, and
//     so do not use PLENV

    pls->adv( 0 );

// Use standard viewport, and define X range from 0 to 360 degrees, Y range
//     from -1.2 to 1.2.

    pls->vsta();
    pls->wind( 0.0, 360.0, -1.2, 1.2 );

    // Draw a box with ticks spaced 60 degrees apart in X, and 0.2 in Y.

    pls->col0( 1 );
    pls->box( "bcnst", 60.0, 2, "bcnstv", 0.2, 2 );

    // Superimpose a dashed line grid, with 1.5 mm marks and spaces. plstyl
    // expects a pointer!!

    pls->styl( 1, &mark1, &space1 );
    pls->col0( 2 );
    pls->box( "g", 30.0, 0, "g", 0.2, 0 );
    pls->styl( 0, &mark0, &space0 );

    pls->col0( 3 );
    pls->lab( "Angle (degrees)", "sine", "#frPLplot Example 1 - Sine function" );

    for ( i = 0; i < 101; i++ )
    {
        x[i] = 3.6 * i;
        y[i] = sin( x[i] * M_PI / 180.0 );
    }

    pls->col0( 4 );
    pls->line( 101, x, y );
    pls->flush();
}

//--------------------------------------------------------------------------

void x14::plot4( plstream *pls )
{
    int   i, j;
    PLFLT dtr, theta, dx, dy, r;
    char  text[4];
    PLFLT x0[361], y0[361];
    PLFLT x[361], y[361];

    dtr = M_PI / 180.0;
    for ( i = 0; i <= 360; i++ )
    {
        x0[i] = cos( dtr * i );
        y0[i] = sin( dtr * i );
    }

// Set up viewport and window, but do not draw box

    pls->env( -1.3, 1.3, -1.3, 1.3, 1, -2 );
    for ( i = 1; i <= 10; i++ )
    {
        for ( j = 0; j <= 360; j++ )
        {
            x[j] = 0.1 * i * x0[j];
            y[j] = 0.1 * i * y0[j];
        }

// Draw circles for polar grid

        pls->line( 361, x, y );
    }

    pls->col0( 2 );
    for ( i = 0; i <= 11; i++ )
    {
        theta = 30.0 * i;
        dx    = cos( dtr * theta );
        dy    = sin( dtr * theta );

// Draw radial spokes for polar grid

        pls->join( 0.0, 0.0, dx, dy );
        sprintf( text, "%d", (int) ROUND( theta ) );

// Write labels for angle

//Slightly off zero to avoid floating point logic flips at 90 and 270 deg.
        if ( dx >= -0.00001 )
            pls->ptex( dx, dy, dx, dy, -0.15, text );
        else
            pls->ptex( dx, dy, -dx, -dy, 1.15, text );
    }

// Draw the graph

    for ( i = 0; i <= 360; i++ )
    {
        r    = sin( dtr * ( 5 * i ) );
        x[i] = x0[i] * r;
        y[i] = y0[i] * r;
    }
    pls->col0( 3 );
    pls->line( 361, x, y );

    pls->col0( 4 );
    pls->mtex( "t", 2.0, 0.5, 0.5,
        "#frPLplot Example 3 - r(#gh)=sin 5#gh" );
    pls->flush();
}

//--------------------------------------------------------------------------

// Demonstration of contour plotting

void x14::plot5( plstream *pls )
{
    int          i, j;
    PLFLT        xx, yy;
    PLFLT        **z, **w;
    static PLINT mark = 1500, space = 1500;

// Set up function arrays

    pls->Alloc2dGrid( &z, xpts, ypts );
    pls->Alloc2dGrid( &w, xpts, ypts );

    for ( i = 0; i < xpts; i++ )
    {
        xx = (double) ( i - ( xpts / 2 ) ) / (double) ( xpts / 2 );
        for ( j = 0; j < ypts; j++ )
        {
            yy      = (double) ( j - ( ypts / 2 ) ) / (double) ( ypts / 2 ) - 1.0;
            z[i][j] = xx * xx - yy * yy;
            w[i][j] = 2 * xx * yy;
        }
    }

    pls->env( -1.0, 1.0, -1.0, 1.0, 0, 0 );
    pls->col0( 2 );
    pls->cont( z, xpts, ypts, 1, xpts, 1, ypts, clevel, 11, x14::mypltr, NULL );
    pls->styl( 1, &mark, &space );
    pls->col0( 3 );
    pls->cont( w, xpts, ypts, 1, xpts, 1, ypts, clevel, 11, x14::mypltr, NULL );
    pls->col0( 1 );
    pls->lab( "X Coordinate", "Y Coordinate", "Streamlines of flow" );
    pls->flush();
}


int main( int argc, const char ** argv )
{
    x14 *x = new x14( argc, argv );

    delete x;
}


//--------------------------------------------------------------------------
//                              End of x14.cc
//--------------------------------------------------------------------------