libplplot-dev 5.9.9-2ubuntu2 / usr / share / doc / libplplot11 / examples / c++ / x01.cc

//--------------------------------------------------------------------------
// $Id: x01.cc 11297 2010-11-02 03:31:14Z 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 1 in C++.
//--------------------------------------------------------------------------

#include "plc++demos.h"

#include "plevent.h"
#include <cctype>

#ifdef PL_HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef PL_USE_NAMESPACE
using namespace std;
#endif

static PLGraphicsIn gin;

static int          locate_mode;
static int          test_xor;
static int          fontset;
static char         *f_name;

static const char   *notes[] = { "Make sure you get it right!", "" };

// Options data structure definition.
static PLOptionTable options[] = {
    {
        "locate",               // Turns on test of API locate function
        NULL,
        NULL,
        &locate_mode,
        PL_OPT_BOOL,
        "-locate",
        "Turns on test of API locate function"
    },
    {
        "xor",                  // Turns on test of xor function
        NULL,
        NULL,
        &test_xor,
        PL_OPT_BOOL,
        "-xor",
        "Turns on test of XOR"
    },
    {
        "font",                 // For switching between font set 1 & 2
        NULL,
        NULL,
        &fontset,
        PL_OPT_INT,
        "-font number",
        "Selects stroke font set (0 or 1, def:1)"
    },
    {
        "save",                 // For saving in postscript
        NULL,
        NULL,
        &f_name,
        PL_OPT_STRING,
        "-save filename",
        "Save plot in color postscript `file'"
    },
    {
        NULL,                   // option
        NULL,                   // handler
        NULL,                   // client data
        NULL,                   // address of variable to set
        0,                      // mode flag
        NULL,                   // short syntax
        NULL
    }                           // long syntax
};


class x01 {
public:
    x01( int, const char ** );

    void plot1( int );
    void plot2();
    void plot3();


private:
    // Class data
    PLFLT    xscale, yscale, xoff, yoff;
    plstream *pls;
};


x01::x01( int argc, const char ** argv )
{
    char ver[80];

    fontset = 1;
    f_name  = NULL;


    // plplot initialization
    // Divide page into 2x2 plots unless user overrides.

    pls = new plstream();

    // Parse and process command line arguments.
    pls->MergeOpts( options, "x01c options", notes );
    pls->parseopts( &argc, argv, PL_PARSE_FULL );

    // Print out version number, just for kicks.
    pls->gver( ver );

    cout << "PLplot library version: " << ver << endl;


    // Initialize PLplot.
    pls->star( 2, 2 );

    // Select the multi-stroke font.
    pls->fontld( 1 );

    // Set up the data
    // Original case

    xscale = 6.;
    yscale = 1.;
    xoff   = 0.;
    yoff   = 0.;

    // Do a plot
    plot1( 0 );

    // Set up the data

    xscale = 1.;
    yscale = 0.0014;
    yoff   = 0.0185;

    // Do a plot

    int digmax = 5;
    pls->syax( digmax, 0 );

    plot1( 1 );

    plot2();

    plot3();

    // Show how to save a plot:
    // Open a new device, make it current, copy parameters,
    // and replay the plot buffer

    if ( f_name ) // command line option '-save filename'

    {
        cout << "The current plot was saved in color Postscript under the name `" << f_name << "'" << endl;
        plstream *pls2;

        pls2 = new plstream();       // create a new one

        pls2->sfnam( f_name );       // file name
        pls2->sdev( "psc" );         // device type

        pls2->cpstrm( *pls, false ); // copy old stream parameters to new stream
        pls2->replot();              // do the save by replaying the plot buffer

        delete pls2;
    }

    // Let's get some user input

    if ( locate_mode )
    {
        while ( 1 )
        {
            if ( !pls->GetCursor( &gin ) )
                break;
            if ( gin.keysym == PLK_Escape )
                break;

            pls->text();
            if ( gin.keysym < 0xFF && isprint( gin.keysym ) )
                cout << "wx = " << gin.wX << ", wy = " << gin.wY <<
                ", dx = " << gin.dX << ",  dy = " << gin.dY <<
                ",  c = '" << gin.keysym << "'" << endl;
            else
                cout << "wx = " << gin.wX << ", wy = " << gin.wY <<
                ", dx = " << gin.dX << ",  dy = " << gin.dY <<
                ",  c = '" << gin.keysym << "'" << endl;
            //	printf("wx = %f,  wy = %f, dx = %f,  dy = %f,  c = 0x%02x\n",
            //                              gin.wX, gin.wY, gin.dX, gin.dY, gin.keysym);

            pls->gra();
        }
    }

    // In C++ we don't call plend() to finish off
    // this is handled by the destructor
    delete pls;
}

void x01::plot1( int do_test )
{
    int   i;
    PLFLT xmin, xmax, ymin, ymax;
    PLFLT *x  = new PLFLT[60];
    PLFLT *y  = new PLFLT[60];
    PLFLT *xs = new PLFLT[6];
    PLFLT *ys = new PLFLT[6];

    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( 2 );
    pls->lab( "(x)", "(y)", "#frPLplot Example 1 - y=x#u2" );

    // Plot the data points.

    pls->col0( 4 );
    pls->poin( 6, xs, ys, 9 );

    // Draw the line through the data.

    pls->col0( 3 );
    pls->line( 60, x, y );

// xor mode enable erasing a line/point/text by replotting it again
// it does not work in double buffering mode, however

    if ( do_test && test_xor )
    {
#ifdef PL_HAVE_USLEEP
        bool st;
        pls->xormod( true, &st ); // enter xor mode
        if ( st )
        {
            for ( i = 0; i < 60; i++ )
            {
                pls->poin( 1, x + i, y + i, 9 );   // draw a point
                usleep( 50000 );                   // wait a little
                pls->flush();                      // force an update of the tk driver
                pls->poin( 1, x + i, y + i, 9 );   // erase point
            }
            pls->xormod( false, &st );             // leave xor mode
        }
#else
        cout << "The -xor command line option can only be exercised if your system has usleep(), which does not seems to happen." << endl;
#endif
    }

    delete[] x;
    delete[] y;
    delete[] xs;
    delete[] ys;
}

void x01::plot2()
{
    int   i;
    PLFLT *x = new PLFLT[100];
    PLFLT *y = new PLFLT[100];

    // 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->wid( 2 );
    pls->line( 100, x, y );
    pls->wid( 1 );

    delete[] x;
    delete[] y;
}

void x01::plot3()
{
    int   i;
    PLINT space0 = 0;
    PLINT mark0  = 0;
    PLINT space1 = 1500;
    PLINT mark1  = 1500;
    PLFLT *x     = new PLFLT[101];
    PLFLT *y     = new PLFLT[101];

    // 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 );

    delete[] x;
    delete[] y;
}

int main( int argc, const char ** argv )
{
    x01 *x = new x01( argc, argv );
    delete x;
}


//--------------------------------------------------------------------------
//                              End of x01.cc
//--------------------------------------------------------------------------