libplplot-java 5.10.0-0ubuntu5 / usr / share / doc / libplplot12 / examples / java / x14.java

//--------------------------------------------------------------------------
// $Id: x14.java 12240 2012-10-04 22:10:12Z andrewross $
//--------------------------------------------------------------------------

//--------------------------------------------------------------------------
// Copyright (C) 2004  Alan W. Irwin
// Copyright (C) 2004  Andrew Ross
//

//
// 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 Java.
//--------------------------------------------------------------------------

package plplot.examples;

import plplot.core.*;
import static plplot.core.plplotjavacConstants.*;

import java.lang.Math;
import java.text.*;

class x14 {
    double   xscale, yscale, xoff, yoff;
    PLStream pls1 = new PLStream();
    PLStream pls2 = new PLStream();

    public static void main( String[] args )
    {
        new x14( args );
    }

    public x14( String[] args )
    {
        String  geometry_master = "500x410+100+200";
        String  geometry_slave  = "500x410+650+200";

        int     fam[]    = new int[1];
        int     num[]    = new int[1];
        int     bmax[]   = new int[1];
        double  xp0[]    = new double[1], yp0[] = new double[1];
        int     xleng0[] = new int[1], yleng0[] = new int[1];
        int     xoff0[]  = new int[1], yoff0[] = new int[1];
        boolean valid_geometry;


        // Parse and process command line arguments.

        pls1.parseopts( args, PL_PARSE_FULL | PL_PARSE_NOPROGRAM );

        //      If valid geometry specified on command line, use it for both streams.

        pls1.gpage( xp0, yp0, xleng0, yleng0, xoff0, yoff0 );
        valid_geometry = ( xleng0[0] > 0 && yleng0[0] > 0 );

        // Set up first stream

        if ( valid_geometry )
            pls1.spage( xp0[0], yp0[0], xleng0[0], yleng0[0], xoff0[0], yoff0[0] );
        else
            pls1.setopt( "geometry", geometry_master );

        pls1.ssub( 2, 2 );
        pls1.init();

        StringBuffer driver = new StringBuffer( 80 );

        pls1.gdev( driver );
        pls1.gfam( fam, num, bmax );
        String sdriver = new String( driver );
        System.out.println( "Demo of multiple output streams via the " + sdriver + " driver." );
        System.out.println( "Running with the second stream as slave to the first." );
        System.out.println( "" );

        // Start next stream

        // Turn off pause to make this a slave (must follow master)

        if ( valid_geometry )
            pls2.spage( xp0[0], yp0[0], xleng0[0], yleng0[0], xoff0[0], yoff0[0] );
        else
            pls2.setopt( "geometry", geometry_slave );
        pls2.spause( false );
        pls2.sdev( sdriver );
        pls2.sfam( fam[0], num[0], bmax[0] );
        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;
        int 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 pleop() 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();

        // Call plend to finish off.

        //pls2.endl();
        pls1.end();
    }

    void plot1( PLStream pls )
    {
        int    i;
        double xmin, xmax, ymin, ymax;
        double x[]  = new double[60];
        double y[]  = new double[60];
        double xs[] = new double[6];
        double ys[] = new double[6];

        for ( i = 0; i < 60; i++ )
        {
            x[i] = xoff + xscale * ( i + 1 ) / 60.0;
            y[i] = yoff + yscale * Math.pow( 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( xs, ys, 9 );

        // Draw the line through the data.

        pls.col0( 4 );
        pls.line( x, y );
        pls.flush();
    }

    void plot2( PLStream pls )
    {
        int    i;
        double x[] = new double[100];
        double y[] = new double[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] = Math.sin( x[i] ) / x[i];
        }

        // Draw the line.

        pls.col0( 3 );
        pls.line( x, y );
        pls.flush();
    }

    void plot3( PLStream pls )
    {
        int    i;
        int    space0[] = {};
        int    mark0[] = {};
        int    space1[] = { 1500 };
        int    mark1[]  = { 1500 };
        double x[]      = new double[101];
        double y[]      = new double[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( mark1, space1 );
        pls.col0( 2 );
        pls.box( "g", 30.0, 0, "g", 0.2, 0 );
        pls.styl( 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] = Math.sin( x[i] * Math.PI / 180.0 );
        }

        pls.col0( 4 );
        pls.line( x, y );
        pls.flush();
    }

    void plot4( PLStream pls )
    {
        NumberFormat nf = NumberFormat.getNumberInstance();

        int          i, j;
        double       dtr, theta, dx, dy, r;

        double[] x0 = new double[361];
        double[] y0 = new double[361];
        double[] x  = new double[361];
        double[] y  = new double[361];

        dtr = Math.PI / 180.0;
        for ( i = 0; i <= 360; i++ )
        {
            x0[i] = Math.cos( dtr * i );
            y0[i] = Math.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( x, y );
        }

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

            // Draw radial spokes for polar grid.

            pls.join( 0.0, 0.0, dx, dy );
            String text = nf.format( 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    = Math.sin( dtr * ( 5 * i ) );
            x[i] = x0[i] * r;
            y[i] = y0[i] * r;
        }
        pls.col0( 3 );
        pls.line( x, y );

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

    static final int    XPTS     = 35;
    static final int    YPTS     = 46;
    static final double XSPA     = 2. / ( XPTS - 1 );
    static final double YSPA     = 2. / ( YPTS - 1 );
    final double        clevel[] = { -1., -.8, -.6, -.4, -.2, 0, .2, .4, .6, .8, 1. };
// Transformation function
    final double        tr[] = { XSPA, 0.0, -1.0, 0.0, YSPA, -1.0 };

    void plot5( PLStream pls )
    {
        int i, j;

        double[][] xg0 = new double[XPTS][YPTS];
        double[][] yg0 = new double[XPTS][YPTS];
        double[][] z   = new double[XPTS][YPTS];
        double[][] w   = new double[XPTS][YPTS];

        double      xx, yy;
        final int[] mark  = { 1500 };
        final int[] space = { 1500 };
        final int[] mark0 = {};
        final int[] space0 = {};

        // Set up function arrays

        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;
            }
        }

        // Set up grids


        for ( i = 0; i < XPTS; i++ )
        {
            for ( j = 0; j < YPTS; j++ )
            {
                // Replacement for mypltr of x09c.c
                xx = tr[0] * i + tr[1] * j + tr[2];
                yy = tr[3] * i + tr[4] * j + tr[5];

                // Note these are one-dimensional because of arrangement of
                // zeros in the final tr definition above.
                // But I haven't found out yet, how with swig to overload
                // one- and two-dimensional array arguments so for now make
                // xg0 --> yg1 two-dimensional.
                xg0[i][j] = xx;
                yg0[i][j] = yy;
            }
        }


        // Plot using scaled identity transform used to create xg0 and yg0

        pls.env( -1.0, 1.0, -1.0, 1.0, 0, 0 );
        pls.col0( 2 );
        pls.cont( z, 1, XPTS, 1, YPTS, clevel, xg0, yg0 );
        pls.styl( mark, space );
        pls.col0( 3 );
        pls.cont( w, 1, XPTS, 1, YPTS, clevel, xg0, yg0 );
        pls.styl( mark0, space0 );
        pls.col0( 1 );
        pls.lab( "X Coordinate", "Y Coordinate", "Streamlines of flow" );
        pls.flush();
    }
}

//--------------------------------------------------------------------------
//                              End of x14.java
//--------------------------------------------------------------------------