/usr/share/doc/libplplot12/examples/java/x19.java is in libplplot-java 5.10.0-0ubuntu5.
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// $Id: x19.java 12532 2013-09-26 15:18:37Z andrewross $
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
// Copyright (C) 2001 Geoffrey Furnish
//
// 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 19 in Java.
//--------------------------------------------------------------------------
package plplot.examples;
import plplot.core.*;
import static plplot.core.plplotjavacConstants.*;
import java.lang.Math;
class MapTransform implements PLCallbackCT {
public void coordTransform( double x, double y, double[] xt, double[] yt, Object data )
{
double radius;
radius = 90.0 - y;
xt[0] = radius * Math.cos( x * Math.PI / 180.0 );
yt[0] = radius * Math.sin( x * Math.PI / 180.0 );
}
}
class Mapform19 implements PLCallbackMapform {
public void mapform( double[] x, double[] y )
{
int i;
double xp, yp, radius;
for ( i = 0; i < x.length; i++ )
{
radius = 90.0 - y[i];
xp = radius * Math.cos( x[i] * Math.PI / 180.0 );
yp = radius * Math.sin( x[i] * Math.PI / 180.0 );
x[i] = xp;
y[i] = yp;
}
}
}
class LabelFunc19 implements PLCallbackLabel {
// A custom axis labeling function for longitudes and latitudes.
public String label( int axis, double value )
{
String label = "";
String direction_label = "";
double label_val = 0.0;
if ( axis == PL_Y_AXIS )
{
label_val = value;
if ( label_val > 0.0 )
{
direction_label = " N";
}
else if ( label_val < 0.0 )
{
direction_label = " S";
}
else
{
direction_label = "Eq";
}
}
else if ( axis == PL_X_AXIS )
{
label_val = normalize_longitude( value );
if ( label_val > 0.0 )
{
direction_label = " E";
}
else if ( label_val < 0.0 )
{
direction_label = " W";
}
else
{
direction_label = "";
}
}
if ( axis == PL_Y_AXIS && value == 0.0 )
{
// A special case for the equator
label = direction_label;
}
else
{
label = "" + ( (int) Math.abs( label_val ) ) + direction_label;
}
return label;
}
// "Normalize" longitude values so that they always fall between -180.0
// and 180.0
double normalize_longitude( double lon )
{
double times;
if ( lon >= -180.0 && lon <= 180.0 )
{
return ( lon );
}
else
{
times = Math.floor( ( Math.abs( lon ) + 180.0 ) / 360.0 );
if ( lon < 0.0 )
{
return ( lon + 360.0 * times );
}
else
{
return ( lon - 360.0 * times );
}
}
}
}
class x19 {
PLStream pls = new PLStream();
public static void main( String[] args )
{
new x19( args );
}
public x19 ( String[] args )
{
double minx, maxx, miny, maxy;
PLCallbackMapform nullCallback = null;
PLCallbackLabel nullLabelCallback = null;
PLCallbackCT nullCTCallback = null;
LabelFunc19 geolocation_labeler = new LabelFunc19();
MapTransform map_transform = new MapTransform();
double[] x = new double[1];
double[] y = new double[1];
// Parse and process command line arguments.
pls.parseopts( args, PL_PARSE_FULL | PL_PARSE_NOPROGRAM );
// Longitude (x) and latitude (y)
miny = -70;
maxy = 80;
// Initialize PLplot.
pls.init();
// Cartesian plots
// Most of world
minx = -170;
maxx = minx + 360;
// Setup a custom latitude and longitude-based scaling function.
pls.slabelfunc( geolocation_labeler );
pls.col0( 1 );
pls.env( minx, maxx, miny, maxy, 1, 70 );
pls.map( nullCallback, "usaglobe", minx, maxx, miny, maxy );
// The Americas
minx = 190;
maxx = 340;
pls.col0( 1 );
pls.env( minx, maxx, miny, maxy, 1, 70 );
pls.map( nullCallback, "usaglobe", minx, maxx, miny, maxy );
// Clear the labelling function.
pls.slabelfunc( nullLabelCallback );
// Polar, Northern hemisphere
// Create callback object containing mapform function
Mapform19 mapform19 = new Mapform19();
minx = 0;
maxx = 360;
pls.env( -75., 75., -75., 75., 1, -1 );
pls.map( mapform19, "globe", minx, maxx, miny, maxy );
pls.lsty( 2 );
pls.meridians( mapform19, 10.0, 10.0, 0.0, 360.0, -10.0, 80.0 );
// Polar, Northern hemisphere, this time with a PLplot-wide transform
minx = 0;
maxx = 360;
pls.stransform( map_transform, null );
pls.lsty( 1 );
pls.env( -75., 75., -75., 75., 1, -1 );
// No need to set the map transform here as the global transform
// will be used.
pls.map( nullCallback, "globe", minx, maxx, miny, maxy );
pls.lsty( 2 );
pls.meridians( nullCallback, 10.0, 10.0, 0.0, 360.0, -10.0, 80.0 );
// Show Baltimore, MD on the map
pls.col0( 2 );
pls.ssym( 0.0, 2.0 );
x[0] = -76.6125;
y[0] = 39.2902778;
pls.poin( x, y, 18 );
pls.ssym( 0.0, 1.0 );
pls.ptex( -76.6125, 43.0, 0.0, 0.0, 0.0, "Baltimore, MD" );
// For Java, this is how the global transform is cleared
pls.stransform( nullCTCallback, null );
pls.end();
}
}
//--------------------------------------------------------------------------
// End of x19.java
//--------------------------------------------------------------------------
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