/usr/share/doc/libplplot12/examples/java/x29.java is in libplplot-java 5.10.0-0ubuntu5.
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//
// Sample plots using date / time formatting for axes
//
// Copyright (C) 2008 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; either version 2 of the License, or
// (at your option) any later version.
//
// 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
//
package plplot.examples;
import plplot.core.*;
import static plplot.core.plplotjavacConstants.*;
import java.util.*;
class x29 {
PLStream pls = new PLStream();
//------------------------------------------------------------------------
// main
//
// Draws several plots which demonstrate the use of date / time formats
// for the axis labels.
// Time formatting is done using the system strftime routine. See the
// documentation of this for full details of the available formats.
//
// 1) Plotting temperature over a day (using hours / minutes)
// 2) Plotting
//
// Note: Times are stored as seconds since the epoch (usually
// 1st Jan 1970).
//
//------------------------------------------------------------------------
x29( String[] args )
{
// Parse command line arguments
pls.parseopts( args, PL_PARSE_FULL | PL_PARSE_NOPROGRAM );
// Initialize plplot
pls.init();
pls.sesc( '@' );
plot1();
plot2();
plot3();
plot4();
pls.end();
}
// Plot a model diurnal cycle of temperature
void plot1()
{
int i, npts;
double xmin, xmax, ymin, ymax;
double x[], y[], xerr1[], xerr2[], yerr1[], yerr2[];
// Data points every 10 minutes for 1 day
npts = 73;
x = new double[npts];
y = new double[npts];
xerr1 = new double[npts];
xerr2 = new double[npts];
yerr1 = new double[npts];
yerr2 = new double[npts];
xmin = 0;
xmax = 60.0 * 60.0 * 24.0; // Number of seconds in a day
ymin = 10.0;
ymax = 20.0;
for ( i = 0; i < npts; i++ )
{
x[i] = xmax * ( (double) i / (double) npts );
y[i] = 15.0 - 5.0 * Math.cos( 2 * Math.PI * ( (double) i / (double) npts ) );
// Set x error bars to +/- 5 minute
xerr1[i] = x[i] - 60 * 5;
xerr2[i] = x[i] + 60 * 5;
// Set y error bars to +/- 0.1 deg C
yerr1[i] = y[i] - 0.1;
yerr2[i] = y[i] + 0.1;
}
pls.adv( 0 );
// Rescale major ticks marks by 0.5
pls.smaj( 0.0, 0.5 );
// Rescale minor ticks and error bar marks by 0.5
pls.smin( 0.0, 0.5 );
pls.vsta();
pls.wind( xmin, xmax, ymin, ymax );
// Draw a box with ticks spaced every 3 hour in X and 1 degree C in Y.
pls.col0( 1 );
// Set time format to be hours:minutes
pls.timefmt( "%H:%M" );
pls.box( "bcnstd", 3.0 * 60 * 60, 3, "bcnstv", 1, 5 );
pls.col0( 3 );
pls.lab( "Time (hours:mins)", "Temperature (degC)", "@frPLplot Example 29 - Daily temperature" );
pls.col0( 4 );
pls.line( x, y );
pls.col0( 2 );
pls.errx( xerr1, xerr2, y );
pls.col0( 3 );
pls.erry( x, yerr1, yerr2 );
// Rescale major / minor tick marks back to default
pls.smin( 0.0, 1.0 );
pls.smaj( 0.0, 1.0 );
}
// Plot the number of hours of daylight as a function of day for a year
void plot2()
{
int j, npts;
double xmin, xmax, ymin, ymax;
double lat, p, d;
double x[], y[];
// Latitude for London
lat = 51.5;
npts = 365;
x = new double[npts];
y = new double[npts];
xmin = 0;
xmax = npts * 60.0 * 60.0 * 24.0;
ymin = 0;
ymax = 24;
// Formula for hours of daylight from
// "A Model Comparison for Daylength as a Function of Latitude and
// Day of the Year", 1995, Ecological Modelling, 80, pp 87-95.
for ( j = 0; j < npts; j++ )
{
x[j] = j * 60.0 * 60.0 * 24.0;
p = Math.asin( 0.39795 * Math.cos( 0.2163108 + 2 * Math.atan( 0.9671396 * Math.tan( 0.00860 * ( j - 186 ) ) ) ) );
d = 24.0 - ( 24.0 / Math.PI ) *
Math.acos( ( Math.sin( 0.8333 * Math.PI / 180.0 ) + Math.sin( lat * Math.PI / 180.0 ) * Math.sin( p ) ) /
( Math.cos( lat * Math.PI / 180.0 ) * Math.cos( p ) ) );
y[j] = d;
}
pls.col0( 1 );
// Set time format to be abbreviated month name followed by day of month
pls.timefmt( "%b %d" );
pls.prec( 1, 1 );
pls.env( xmin, xmax, ymin, ymax, 0, 40 );
pls.col0( 3 );
pls.lab( "Date", "Hours of daylight", "@frPLplot Example 29 - Hours of daylight at 51.5N" );
pls.col0( 4 );
pls.line( x, y );
pls.prec( 0, 0 );
}
void plot3()
{
int i, npts;
double xmin, xmax, ymin, ymax;
long tstart;
double x[], y[];
TimeZone tz = TimeZone.getTimeZone( "UTC" );
Calendar cal = Calendar.getInstance( tz );
cal.set( 2005, 11, 1, 0, 0, 0 );
tstart = cal.getTimeInMillis() / 1000;
npts = 62;
x = new double[npts];
y = new double[npts];
xmin = tstart;
xmax = xmin + npts * 60.0 * 60.0 * 24.0;
ymin = 0.0;
ymax = 5.0;
for ( i = 0; i < npts; i++ )
{
x[i] = xmin + i * 60.0 * 60.0 * 24.0;
y[i] = 1.0 + Math.sin( 2 * Math.PI * ( i ) / 7.0 ) +
Math.exp( ( Math.min( i, npts - i ) ) / 31.0 );
}
pls.adv( 0 );
pls.vsta();
pls.wind( xmin, xmax, ymin, ymax );
pls.col0( 1 );
// Set time format to be ISO 8601 standard YYYY-MM-HH. Note that this is
// equivalent to %f for C99 compliant implementations of strftime.
pls.timefmt( "%Y-%m-%d" );
// Draw a box with ticks spaced every 14 days in X and 1 hour in Y.
pls.box( "bcnstd", 14 * 24.0 * 60.0 * 60.0, 14, "bcnstv", 1, 4 );
pls.col0( 3 );
pls.lab( "Date", "Hours of television watched", "@frPLplot Example 29 - Hours of television watched in Dec 2005 / Jan 2006" );
pls.col0( 4 );
pls.ssym( 0.0, 0.5 );
pls.poin( x, y, 2 );
pls.line( x, y );
}
void plot4()
{
// TAI-UTC (seconds) as a function of time.
// Use Besselian epochs as the continuous time interval just to prove
// this does not introduce any issues.
double scale, offset1, offset2;
double xmin[] = new double[1], xmax[] = new double[1];
double ymin = 0.0, ymax = 0.0, xlabel_step = 0.0;
int kind, npts = 1001, i;
boolean if_TAI_time_format = false;
String time_format = "";
String title_suffix = "";
String xtitle = "";
String title = "";
double x[];
double y[];
int tai_year[] = new int[1], tai_month[] = new int[1],
tai_day[] = new int[1], tai_hour[] = new int[1],
tai_min[] = new int[1];
double tai_sec[] = new double[1], tai;
int utc_year[] = new int[1], utc_month[] = new int[1],
utc_day[] = new int[1], utc_hour[] = new int[1],
utc_min[] = new int[1];
double utc_sec[] = new double[1], utc[] = new double[1];
// Use the definition given in http://en.wikipedia.org/wiki/Besselian_epoch
// B = 1900. + (JD -2415020.31352)/365.242198781
// ==> (as calculated with aid of "bc -l" command)
// B = (MJD + 678940.364163900)/365.242198781
// ==>
// MJD = B*365.24219878 - 678940.364163900
scale = 365.242198781;
offset1 = -678940.;
offset2 = -0.3641639;
pls.configtime( scale, offset1, offset2, 0x0, false, 0, 0, 0, 0, 0, 0. );
for ( kind = 0; kind < 7; kind++ )
{
if ( kind == 0 )
{
pls.ctime( 1950, 0, 2, 0, 0, 0., xmin );
pls.ctime( 2020, 0, 2, 0, 0, 0., xmax );
npts = 70 * 12 + 1;
ymin = 0.0;
ymax = 36.0;
time_format = "%Y%";
if_TAI_time_format = true;
title_suffix = "from 1950 to 2020";
xtitle = "Year";
xlabel_step = 10.;
}
else if ( kind == 1 || kind == 2 )
{
pls.ctime( 1961, 7, 1, 0, 0, 1.64757 - .20, xmin );
pls.ctime( 1961, 7, 1, 0, 0, 1.64757 + .20, xmax );
npts = 1001;
ymin = 1.625;
ymax = 1.725;
time_format = "%S%2%";
title_suffix = "near 1961-08-01 (TAI)";
xlabel_step = 0.05 / ( scale * 86400. );
if ( kind == 1 )
{
if_TAI_time_format = true;
xtitle = "Seconds (TAI)";
}
else
{
if_TAI_time_format = false;
xtitle = "Seconds (TAI) labelled with corresponding UTC";
}
}
else if ( kind == 3 || kind == 4 )
{
pls.ctime( 1963, 10, 1, 0, 0, 2.6972788 - .20, xmin );
pls.ctime( 1963, 10, 1, 0, 0, 2.6972788 + .20, xmax );
npts = 1001;
ymin = 2.55;
ymax = 2.75;
time_format = "%S%2%";
title_suffix = "near 1963-11-01 (TAI)";
xlabel_step = 0.05 / ( scale * 86400. );
if ( kind == 3 )
{
if_TAI_time_format = true;
xtitle = "Seconds (TAI)";
}
else
{
if_TAI_time_format = false;
xtitle = "Seconds (TAI) labelled with corresponding UTC";
}
}
else if ( kind == 5 || kind == 6 )
{
pls.ctime( 2009, 0, 1, 0, 0, 34. - 5., xmin );
pls.ctime( 2009, 0, 1, 0, 0, 34. + 5., xmax );
npts = 1001;
ymin = 32.5;
ymax = 34.5;
time_format = "%S%2%";
title_suffix = "near 2009-01-01 (TAI)";
xlabel_step = 1. / ( scale * 86400. );
if ( kind == 5 )
{
if_TAI_time_format = true;
xtitle = "Seconds (TAI)";
}
else
{
if_TAI_time_format = false;
xtitle = "Seconds (TAI) labelled with corresponding UTC";
}
}
x = new double[npts];
y = new double[npts];
for ( i = 0; i < npts; i++ )
{
x[i] = xmin[0] + i * ( xmax[0] - xmin[0] ) / ( npts - 1 );
pls.configtime( scale, offset1, offset2, 0x0, false, 0, 0, 0, 0, 0, 0. );
tai = x[i];
pls.btime( tai_year, tai_month, tai_day, tai_hour, tai_min, tai_sec, tai );
pls.configtime( scale, offset1, offset2, 0x2, false, 0, 0, 0, 0, 0, 0. );
pls.btime( utc_year, utc_month, utc_day, utc_hour, utc_min, utc_sec, tai );
pls.configtime( scale, offset1, offset2, 0x0, false, 0, 0, 0, 0, 0, 0. );
pls.ctime( utc_year[0], utc_month[0], utc_day[0], utc_hour[0], utc_min[0], utc_sec[0], utc );
y[i] = ( tai - utc[0] ) * scale * 86400.;
}
pls.adv( 0 );
pls.vsta();
pls.wind( xmin[0], xmax[0], ymin, ymax );
pls.col0( 1 );
if ( if_TAI_time_format )
pls.configtime( scale, offset1, offset2, 0x0, false, 0, 0, 0, 0, 0, 0. );
else
pls.configtime( scale, offset1, offset2, 0x2, false, 0, 0, 0, 0, 0, 0. );
pls.timefmt( time_format );
pls.box( "bcnstd", xlabel_step, 0, "bcnstv", 0., 0 );
pls.col0( 3 );
title = "@frPLplot Example 29 - TAI-UTC " + title_suffix;
pls.lab( xtitle, "TAI-UTC (sec)", title );
pls.col0( 4 );
pls.line( x, y );
}
}
public static void main( String[] args )
{
new x29( args );
}
};
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