/usr/share/doc/libplplot12/examples/java/x20.java is in libplplot-java 5.10.0-0ubuntu5.
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// $Id: x20.java 12240 2012-10-04 22:10:12Z andrewross $
//--------------------------------------------------------------------------
//
//--------------------------------------------------------------------------
// Copyright (C) 2004,2006 Andrew Ross
// Copyright (C) 2004 Alan W. Irwin
//
// 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 20 in Java.
//--------------------------------------------------------------------------
//
// Current user defined command line options are not supported in
// the Java bindings
//
package plplot.examples;
import plplot.core.*;
import static plplot.core.plplotjavacConstants.*;
import java.io.*;
import java.util.*;
class x20 {
// Class data
PLStream pls = new PLStream();
static int XDIM = 260;
static int YDIM = 220;
static boolean dbg = false;
static boolean nosombrero = false;
static boolean nointeractive = false;
static String f_name = null;
//static PLOptionTable options[];
// PLOptionTable options[] = {
// {
// "dbg", /* extra debugging plot */
// NULL,
// NULL,
// &dbg,
// PL_OPT_BOOL,
// "-dbg",
// "Extra debugging plot" },
// {
// "nosombrero", /* Turns on test of xor function */
// NULL,
// NULL,
// &nosombrero,
// PL_OPT_BOOL,
// "-nosombrero",
// "No sombrero plot" },
// {
// "nointeractive", /* Turns on test of xor function */
// NULL,
// NULL,
// &nointeractive,
// PL_OPT_BOOL,
// "-nointeractive",
// "No interactive selection" },
// {
// "save", /* For saving in postscript */
// NULL,
// NULL,
// &f_name,
// PL_OPT_STRING,
// "-save filename",
// "Save sombrero plot in color postscript `filename'" },
// {
// NULL, /* option */
// NULL, /* handler */
// NULL, /* client data */
// NULL, /* address of variable to set */
// 0, /* mode flag */
// NULL, /* short syntax */
// NULL } /* long syntax */
// };
x20( String[] args )
{
double x[] = new double[XDIM];
double y[] = new double[YDIM];
double z[][] = new double[XDIM][YDIM];
double r[][];
double xi[] = new double[1];
double yi[] = new double[1];
double xe[] = new double[1];
double ye[] = new double[1];
int i, j, width, height, num_col;
int n[] = new int[1];
double img_f[][];
double img_min;
double img_max;
double maxmin[] = new double[2];
double x0, y0, dy, stretch;
double xg[][], yg[][];
//
// Bugs in plimage():
// -at high magnifications, the left and right edge are ragged, try
// ./x20c -dev xwin -wplt 0.3,0.3,0.6,0.6 -ori 0.5
//
// Bugs in x20c.c:
// -if the window is resized after a selection is made on "lena", when
// making a new selection the old one will re-appear.
//
// plplot initialization
// Parse and process command line arguments.
//pls.MergeOpts(options, "x20c options", NULL);
pls.parseopts( args, PL_PARSE_FULL | PL_PARSE_NOPROGRAM );
// Initialize PLplot.
pls.init();
// view image border pixels
if ( dbg )
{
pls.env( 1., XDIM, 1., YDIM, 1, 1 ); // no plot box
// build a one pixel square border, for diagnostics
for ( i = 0; i < XDIM; i++ )
z[i][YDIM - 1] = 1.; // right
for ( i = 0; i < XDIM; i++ )
z[i][0] = 1.; // left
for ( i = 0; i < YDIM; i++ )
z[0][i] = 1.; // top
for ( i = 0; i < YDIM; i++ )
z[XDIM - 1][i] = 1.; // botton
pls.lab( "...around a blue square.", " ", "A red border should appear..." );
pls.image( z, 1., XDIM, 1., YDIM, 0., 0.,
1., XDIM, 1., YDIM );
}
// sombrero-like demo
if ( !nosombrero )
{
r = new double[XDIM][YDIM];
pls.col0( 2 ); // draw a yellow plot box, useful for diagnostics! :(
pls.env( 0., 2. * Math.PI, 0, 3. * Math.PI, 1, -1 );
for ( i = 0; i < XDIM; i++ )
x[i] = i * 2. * Math.PI / ( XDIM - 1 );
for ( i = 0; i < YDIM; i++ )
y[i] = i * 3. * Math.PI / ( YDIM - 1 );
for ( i = 0; i < XDIM; i++ )
for ( j = 0; j < YDIM; j++ )
{
r[i][j] = Math.sqrt( x[i] * x[i] + y[j] * y[j] ) + 1e-3;
z[i][j] = Math.sin( r[i][j] ) / ( r[i][j] );
}
pls.lab( "No, an amplitude clipped \"sombrero\"", "", "Saturn?" );
pls.ptex( 2., 2., 3., 4., 0., "Transparent image" );
pls.image( z, 0., 2. * Math.PI, 0., 3. * Math.PI, 0.05, 1.,
0., 2. * Math.PI, 0., 3. * Math.PI );
// save the plot
if ( f_name != null )
save_plot( f_name );
}
// read Lena image
if ( ( img_f = read_img( "lena.pgm", n ) ) == null )
{
if ( ( img_f = read_img( "../lena.pgm", n ) ) == null )
{
System.out.println( "File error - aborting" );
pls.end();
System.exit( 1 );
}
}
num_col = n[0];
width = img_f.length;
height = img_f[0].length;
// set gray colormap
gray_cmap( num_col );
// display Lena
pls.env( 1., width, 1., height, 1, -1 );
if ( !nointeractive )
pls.lab( "Set and drag Button 1 to (re)set selection, Button 2 to finish.", " ", "Lena..." );
else
pls.lab( "", " ", "Lena..." );
pls.image( img_f, 1., width, 1., height, 0., 0.,
1., width, 1., height );
// selection/expansion demo
if ( !nointeractive )
{
xi[0] = 200.; xe[0] = 330.;
yi[0] = 280.; ye[0] = 220.;
if ( get_clip( xi, xe, yi, ye ) ) // get selection rectangle
{
pls.end();
System.exit( 0 );
}
//
// I'm unable to continue, clearing the plot and advancing to the next
// one, without hiting the enter key, or pressing the button... help!
//
// Forcing the xwin driver to leave locate mode and destroying the
// xhairs (in GetCursorCmd()) solves some problems, but I still have
// to press the enter key or press Button-2 to go to next plot, even
// if a pladv() is not present! Using plbop() solves the problem, but
// it shouldn't be needed!
//
// pls.bop();
//
// spause(false), adv(0), spause(true), also works,
// but the above question remains.
// With this approach, the previous pause state is lost,
// as there is no API call to get its current state.
//
pls.spause( false );
pls.adv( 0 );
// display selection only
pls.image( img_f, 1., width, 1., height, 0., 0., xi[0], xe[0], ye[0], yi[0] );
pls.spause( true );
// zoom in selection
pls.env( xi[0], xe[0], ye[0], yi[0], 1, -1 );
pls.image( img_f, 1., width, 1., height, 0., 0., xi[0], xe[0], ye[0], yi[0] );
}
// Base the dynamic range on the image contents.
f2mnmx( img_f, width, height, maxmin );
img_max = maxmin[0];
img_min = maxmin[1];
// For java we use 2-d arrays to replace the pltr function
// even for the NULL case.
xg = new double[width + 1][height + 1];
yg = new double[width + 1][height + 1];
for ( i = 0; i <= width; i++ )
{
for ( j = 0; j <= height; j++ )
{
xg[i][j] = i;
yg[i][j] = j;
}
}
// Draw a saturated version of the original image. Only use
// the middle 50% of the image's full dynamic range.
pls.col0( 2 );
pls.env( 0, width, 0, height, 1, -1 );
pls.lab( "", "", "Reduced dynamic range image example" );
pls.imagefr( img_f, 0., width, 0., height, 0., 0.,
img_min + img_max * 0.25,
img_max - img_max * 0.25,
xg, yg );
// Draw a distorted version of the original image, showing its full dynamic range.
pls.env( 0, width, 0, height, 1, -1 );
pls.lab( "", "", "Distorted image example" );
x0 = 0.5 * width;
y0 = 0.5 * height;
dy = 0.5 * height;
stretch = 0.5;
// In C / C++ the following would work, with plimagefr directly calling
// mypltr. For compatibilty with other language bindings the same effect
// can be achieved by generating the transformed grid first and then
// using pltr2.
// plimagefr(img_f, width, height, 0., width, 0., height, 0., 0., img_min, img_max, mypltr, (PLPointer) &stretch);
for ( i = 0; i <= width; i++ )
{
for ( j = 0; j <= height; j++ )
{
xg[i][j] = x0 + ( x0 - i ) * ( 1.0 - stretch *
Math.cos( ( j - y0 ) / dy * Math.PI * 0.5 ) );
yg[i][j] = j;
}
}
pls.imagefr( img_f, 0., width, 0., height, 0., 0., img_min, img_max, xg, yg );
pls.end();
}
// read image from file in binary ppm format
double [][] read_img( String fname, int [] num_col )
{
BufferedReader in;
DataInputStream in2;
double[][] img;
String line;
StringTokenizer st;
int i, j, w, h;
// naive grayscale binary ppm reading. If you know how to, improve it
try {
in = new BufferedReader( new FileReader( fname ) );
in2 = new DataInputStream( new DataInputStream( new BufferedInputStream( new FileInputStream( fname ) ) ) );
}
catch ( FileNotFoundException e ) {
System.out.println( "File " + fname + " not found" );
return null;
}
try {
line = in.readLine();
if ( line.compareTo( "P5\n" ) == 0 ) // I only understand this!
{
System.out.println( line );
System.out.println( "unknown file format " + fname );
return null;
}
in2.skip( line.getBytes().length + 1 );
do
{
line = in.readLine();
in2.skip( line.getBytes().length + 1 );
} while ( line.charAt( 0 ) == '#' );
st = new StringTokenizer( line );
w = Integer.parseInt( st.nextToken() );
h = Integer.parseInt( st.nextToken() );
line = in.readLine();
in2.skip( line.getBytes().length + 1 );
st = new StringTokenizer( line );
num_col[0] = Integer.parseInt( st.nextToken() );
img = new double[w][h];
for ( j = 0; j < h; j++ )
{
for ( i = 0; i < w; i++ )
{
img[i][h - j - 1] = in2.readUnsignedByte();
}
}
}
catch ( IOException e ) {
System.out.println( "Error reading " + fname );
return null;
}
return img;
}
// save plot
void save_plot( String fname )
{
PLStream pls2 = new PLStream(); // create a new one
pls2.sdev( "psc" ); // new device type. Use a known existing driver
pls2.sfnam( fname ); // file name
pls2.cpstrm( pls, false ); // copy old stream parameters to new stream
pls2.replot(); // do the save
}
// get selection square interactively
boolean get_clip( double[] xi, double[] xe, double[] yi, double[] ye )
{
PLGraphicsIn gin = new PLGraphicsIn();
double xxi = xi[0], yyi = yi[0], xxe = xe[0], yye = ye[0], t;
boolean start = false;
boolean[] st = new boolean[1];
pls.xormod( true, st ); // enter xor mode to draw a selection rectangle
if ( st[0] ) // driver has xormod capability, continue
{
double sx[] = new double[5];
double sy[] = new double[5];
while ( true )
{
pls.xormod( false, st );
pls.getCursor( gin );
pls.xormod( true, st );
if ( gin.getButton() == 1 )
{
xxi = gin.getWX(); yyi = gin.getWY();
if ( start )
pls.line( sx, sy ); // clear previous rectangle
start = false;
sx[0] = xxi; sy[0] = yyi;
sx[4] = xxi; sy[4] = yyi;
}
if ( ( gin.getState() & 0x100 ) != 0 )
{
xxe = gin.getWX(); yye = gin.getWY();
if ( start )
pls.line( sx, sy ); // clear previous rectangle
start = true;
sx[2] = xxe; sy[2] = yye;
sx[1] = xxe; sy[1] = yyi;
sx[3] = xxi; sy[3] = yye;
pls.line( sx, sy ); // draw new rectangle
}
if ( gin.getButton() == 3 || gin.getKeysym() == 0x0D || gin.getKeysym() == 'Q' )
{
if ( start )
pls.line( sx, sy ); // clear previous rectangle
break;
}
}
pls.xormod( false, st ); // leave xor mod
if ( xxe < xxi )
{
t = xxi; xxi = xxe; xxe = t;
}
if ( yyi < yye )
{
t = yyi; yyi = yye; yye = t;
}
xe[0] = xxe; xi[0] = xxi;
ye[0] = yye; yi[0] = yyi;
return ( gin.getKeysym() == 'Q' );
}
return false;
}
// set gray colormap
void gray_cmap( int num_col )
{
double r[] = new double[2];
double g[] = new double[2];
double b[] = new double[2];
double pos[] = new double[2];
r[0] = g[0] = b[0] = 0.0;
r[1] = g[1] = b[1] = 1.0;
pos[0] = 0.0;
pos[1] = 1.0;
pls.scmap1n( num_col );
pls.scmap1l( true, pos, r, g, b );
}
// Calculate the minimum and maximum of a 2-d array
void f2mnmx( double [][] f, int nx, int ny, double[] fmaxmin )
{
int i, j;
fmaxmin[0] = f[0][0];
fmaxmin[1] = fmaxmin[0];
for ( i = 0; i < nx; i++ )
{
for ( j = 0; j < ny; j++ )
{
fmaxmin[0] = Math.max( fmaxmin[0], f[i][j] );
fmaxmin[1] = Math.min( fmaxmin[1], f[i][j] );
}
}
}
public static void main( String[] args )
{
new x20( args );
}
}
//--------------------------------------------------------------------------
// End of x20.cc
//--------------------------------------------------------------------------
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