libplplot-dev 5.10.0+dfsg2-0.1ubuntu2 / usr / share / doc / libplplot12 / examples / c++ / x03.cc

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//--------------------------------------------------------------------------
// $Id: x03.cc 12176 2012-02-24 20:33:39Z 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 3 in C++.
//--------------------------------------------------------------------------

#include "plc++demos.h"

#ifdef PL_USE_NAMESPACE
using namespace std;
#endif

class x03 {
public:
    x03( int, const char ** );

private:
    // Class data
    plstream *pls;
};


x03::x03( int argc, const char ** argv )
{
    int   i;
    char  text[4];
    PLFLT dtr, theta, dx, dy, r, offset;

    PLFLT *x0 = new PLFLT[361];
    PLFLT *y0 = new PLFLT[361];
    PLFLT *x  = new PLFLT[361];
    PLFLT *y  = new PLFLT[361];

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


    // plplot initialization

    pls = new plstream();

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

    // Set orientation to portrait - note not all device drivers
    // support this, in particular most interactive drivers do not.
    pls->sori( 1 );

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

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

    pls->env( -1.3, 1.3, -1.3, 1.3, 1, -2 );
    // Draw circles for polar grid
    for ( i = 1; i <= 10; i++ )
    {
        pls->arc( 0.0, 0.0, 0.1 * i, 0.1 * i, 0.0, 360.0, 0.0, 0 );
    }

    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.

        if ( theta < 9.99 )
        {
            offset = 0.45;
        }
        else if ( theta < 99.9 )
        {
            offset = 0.30;
        }
        else
        {
            offset = 0.15;
        }

        //Slightly off zero to avoid floating point logic flips at 90 and 270 deg.
        if ( dx >= -0.00001 )
            pls->ptex( dx, dy, dx, dy, -offset, text );
        else
            pls->ptex( dx, dy, -dx, -dy, 1. + offset, 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" );

    // Close the plot at end.

    // pls->end();

    delete[] x;
    delete[] y;
    delete[] x0;
    delete[] y0;

    delete pls;
}

int main( int argc, const char ** argv )
{
    x03 *x = new x03( argc, argv );

    delete x;
}


//--------------------------------------------------------------------------
//                              End of x03.cc
//--------------------------------------------------------------------------

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