/usr/share/doc/libplplot12/examples/java/x26.java is in libplplot-java 5.10.0-0ubuntu5.
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// $Id: x26.java 12333 2013-05-04 16:35:59Z airwin $
// Multi-lingual version of the first page of example 4.
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
// Copyright (C) 2006 Alan W. Irwin
// Copyright (C) 2006 Andrew Ross
//
// Thanks to the following for providing translated strings for this example:
// Valery Pipin (Russian)
//
// 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
//--------------------------------------------------------------------------
// This example designed just for devices (e.g., psttfc and the
// cairo-related devices) that use the pango and fontconfig libraries. The
// best choice of glyph is selected by fontconfig and automatically rendered
// by pango in way that is sensitive to complex text layout (CTL) language
// issues for each unicode character in this example. Of course, you must
// have the appropriate TrueType fonts installed to have access to all the
// required glyphs.
//
// Translation instructions: The strings to be translated are given by
// x_label, y_label, alty_label, title_label, and line_label below. The
// encoding used must be UTF-8.
//
// The following strings to be translated involve some scientific/mathematical
// jargon which is now discussed further to help translators.
//
// (1) dB is a decibel unit, see http://en.wikipedia.org/wiki/Decibel .
// (2) degrees is an angular measure, see
// http://en.wikipedia.org/wiki/Degree_(angle) .
// (3) low-pass filter is one that transmits (passes) low frequencies.
// (4) pole is in the mathematical sense, see
// http://en.wikipedia.org/wiki/Pole_(complex_analysis) . "Single Pole"
// means a particular mathematical transformation of the filter function has
// a single pole, see
// http://ccrma.stanford.edu/~jos/filters/Pole_Zero_Analysis_I.html .
// Furthermore, a single-pole filter must have an inverse square decline
// (or -20 db/decade). Since the filter plotted here does have that
// characteristic, it must by definition be a single-pole filter, see also
// http://www-k.ext.ti.com/SRVS/Data/ti/KnowledgeBases/analog/document/faqs/1p.htm
// (5) decade represents a factor of 10, see
// http://en.wikipedia.org/wiki/Decade_(log_scale) .
//--------------------------------------------------------------------------
// Implementation of PLplot example 26 in Java.
//--------------------------------------------------------------------------
package plplot.examples;
import plplot.core.*;
import static plplot.core.plplotjavacConstants.*;
import java.lang.Math;
class x26 {
PLStream pls = new PLStream();
static String[] x_label = {
"Frequency",
"Частота"
};
static String[] y_label = {
"Amplitude (dB)",
"Амплитуда (dB)"
};
static String[] alty_label = {
"Phase shift (degrees)",
"Фазовый сдвиг (градусы)"
};
// Short rearranged versions of y_label and alty_label.
static String[][] legend_text = {
{ "Amplitude", "Phase shift" },
{ "Амплитуда", "Фазовый сдвиг" }
};
static String[] title_label = {
"Single Pole Low-Pass Filter",
"Однополюсный Низко-Частотный Фильтр"
};
static String[] line_label = {
"-20 dB/decade",
"-20 dB/десяток"
};
public static void main( String[] args )
{
new x26( args );
}
public x26( String[] args )
{
int nlang, i;
nlang = x_label.length;
if ( ( nlang != y_label.length ) || ( nlang != alty_label.length ) ||
( nlang != title_label.length ) || ( nlang != line_label.length ) )
{
System.out.println( "Internal inconsistency in label dimensions" );
pls.end();
System.exit( 1 );
}
// 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 different languages.
for ( i = 0; i < nlang; i++ )
{
plot1( 0, x_label[i], y_label[i], alty_label[i],
legend_text[i], title_label[i], line_label[i] );
}
pls.end();
}
// Log-linear plot.
void plot1( int type, String x_label, String y_label, String alty_label,
String[] legend_text, String title_label, String line_label )
{
int i;
double[] freql = new double[101];
double[] ampl = new double[101];
double[] phase = new double[101];
double f0, freq;
int[] opt_array = new int[2];
int[] text_colors = new int[2];
int[] line_colors = new int[2];
int[] line_styles = new int[2];
double[] line_widths = new double[2];
int[] symbol_numbers = new int[2];
int[] symbol_colors = new int[2];
double[] symbol_scales = new double[2];
String[] symbols = new String[2];
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, line_label );
// Put labels on.
pls.col0( 1 );
pls.mtex( "b", 3.2, 0.5, 0.5, x_label );
pls.mtex( "t", 2.0, 0.5, 0.5, title_label );
pls.col0( 2 );
pls.mtex( "l", 5.0, 0.5, 0.5, y_label );
// 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, alty_label );
}
// Draw a legend
// First legend entry.
opt_array[0] = PL_LEGEND_LINE;
text_colors[0] = 2;
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.
opt_array[1] = PL_LEGEND_LINE | PL_LEGEND_SYMBOL;
text_colors[1] = 3;
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, 0.10, 15,
1, 1, 0, 0, opt_array,
1.0, 1.0, 2.0,
1., text_colors, legend_text,
null, null, null, null,
line_colors, line_styles, line_widths,
symbol_colors, symbol_scales, symbol_numbers, symbols );
}
}
//--------------------------------------------------------------------------
// End of x26.java
//--------------------------------------------------------------------------
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