/usr/share/doc/libplplot12/examples/java/x04.java is in libplplot-java 5.10.0-0ubuntu5.
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// $Id: x04.java 12329 2013-05-02 22:44:50Z airwin $
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
// Copyright (C) 2001 Geoffrey Furnish
// Copyright (C) 2001, 2002 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 4 in Java.
//--------------------------------------------------------------------------
package plplot.examples;
import plplot.core.*;
import static plplot.core.plplotjavacConstants.*;
import java.lang.Math;
class x04 {
PLStream pls = new PLStream();
public static void main( String[] args )
{
new x04( args );
}
public x04( String[] args )
{
// Parse and process command line arguments.
pls.parseopts( args, PL_PARSE_FULL | PL_PARSE_NOPROGRAM );
// Initialize plplot.
pls.init();
pls.font( 2 );
// Make log plots using two different styles.
plot1( 0 );
plot1( 1 );
pls.end();
}
// Log-linear plot.
void plot1( int type )
{
int i;
double[] freql = new double[101];
double[] ampl = new double[101];
double[] phase = new double[101];
double f0, freq;
int nlegend;
String[] text;
String[] symbols;
int[] opt_array;
int[] text_colors;
int[] line_colors;
int[] line_styles;
double[] line_widths;
int[] symbol_numbers;
int[] symbol_colors;
double[] symbol_scales;
double[] legend_width = new double[1];
double[] legend_height = new double[1];
pls.adv( 0 );
// Set up data for log plot.
f0 = 1.0;
for ( i = 0; i <= 100; i++ )
{
freql[i] = -2.0 + i / 20.0;
freq = Math.pow( 10.0, freql[i] );
// Unbelievably, Java has no log10() that I can find...
ampl[i] = 20.0 * Math.log( 1.0 / Math.sqrt( 1.0 + Math.pow( ( freq / f0 ), 2. ) ) ) / Math.log( 10. );
phase[i] = -( 180.0 / Math.PI ) * Math.atan( freq / f0 );
}
pls.vpor( 0.15, 0.85, 0.1, 0.9 );
pls.wind( -2.0, 3.0, -80.0, 0.0 );
// Try different axis and labelling styles.
pls.col0( 1 );
switch ( type )
{
case 0:
pls.box( "bclnst", 0.0, 0, "bnstv", 0.0, 0 );
break;
case 1:
pls.box( "bcfghlnst", 0.0, 0, "bcghnstv", 0.0, 0 );
break;
}
// Plot ampl vs freq.
pls.col0( 2 );
pls.line( freql, ampl );
pls.col0( 2 );
pls.ptex( 1.6, -30.0, 1.0, -20.0, 0.5, "-20 dB/decade" );
// Put labels on.
pls.col0( 1 );
pls.mtex( "b", 3.2, 0.5, 0.5, "Frequency" );
pls.mtex( "t", 2.0, 0.5, 0.5, "Single Pole Low-Pass Filter" );
pls.col0( 2 );
pls.mtex( "l", 5.0, 0.5, 0.5, "Amplitude (dB)" );
nlegend = 1;
// For the gridless case, put phase vs freq on same plot.
if ( type == 0 )
{
pls.col0( 1 );
pls.wind( -2.0, 3.0, -100.0, 0.0 );
pls.box( "", 0.0, 0, "cmstv", 30.0, 3 );
pls.col0( 3 );
pls.line( freql, phase );
pls.string( freql, phase, "*" );
pls.col0( 3 );
pls.mtex( "r", 5.0, 0.5, 0.5, "Phase shift (degrees)" );
nlegend = 2;
}
text = new String[nlegend];
symbols = new String[nlegend];
opt_array = new int[nlegend];
text_colors = new int[nlegend];
line_colors = new int[nlegend];
line_styles = new int[nlegend];
line_widths = new double[nlegend];
symbol_numbers = new int[nlegend];
symbol_colors = new int[nlegend];
symbol_scales = new double[nlegend];
// Draw a legend
// First legend entry.
opt_array[0] = PL_LEGEND_LINE;
text_colors[0] = 2;
text[0] = "Amplitude";
line_colors[0] = 2;
line_styles[0] = 1;
line_widths[0] = 1.;
// note from the above opt_array the first symbol (and box) indices
// do not have to be specified EXCEPT for symbols.
// Although this is unused, it can't be undefined as the String
// array is copied as part of the java bindings.
symbols[0] = " ";
// Second legend entry.
if ( nlegend == 2 )
{
opt_array[1] = PL_LEGEND_LINE | PL_LEGEND_SYMBOL;
text_colors[1] = 3;
text[1] = "Phase shift";
line_colors[1] = 3;
line_styles[1] = 1;
line_widths[1] = 1.;
symbol_colors[1] = 3;
symbol_scales[1] = 1.;
symbol_numbers[1] = 4;
symbols[1] = "*";
}
// from the above opt_arrays we can completely ignore everything
// to do with boxes.
pls.scol0a( 15, 32, 32, 32, 0.70 );
pls.legend( legend_width, legend_height,
PL_LEGEND_BACKGROUND | PL_LEGEND_BOUNDING_BOX, 0,
0.0, 0.0, 0.1, 15,
1, 1, 0, 0, opt_array,
1.0, 1.0, 2.0,
1., text_colors, text,
null, null, null, null,
line_colors, line_styles, line_widths,
symbol_colors, symbol_scales, symbol_numbers, symbols );
}
}
//--------------------------------------------------------------------------
// End of x04.java
//--------------------------------------------------------------------------
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