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//---------------------------------------------------------------------------//
// $Id: x15.java,v 1.8 2004/01/17 16:41:39 rlaboiss Exp $
//---------------------------------------------------------------------------//
//---------------------------------------------------------------------------//
// Copyright (C) 2001, 2002 Geoffrey Furnish
// Copyright (C) 2002 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//---------------------------------------------------------------------------//
//---------------------------------------------------------------------------//
// Implementation of PLplot example 15 in Java.
//---------------------------------------------------------------------------//
package plplot.examples;
import plplot.core.*;
import java.lang.Math;
class x15 {
final int XPTS = 35;
final int YPTS = 46;
// calculated constants and array that depends on them
final double XSPA = 2./(XPTS-1);
final double YSPA = 2./(YPTS-1);
final double tr[] = {XSPA, 0.0, -1.0, 0.0, YSPA, -1.0};
PLStreamc plsdummy = new PLStreamc();
plplotjavac pls = new plplotjavac();
double fmin, fmax;
// Compute min and max value of a 2-d array.
void f2mnmx( double[][] f, int nx, int ny )
{
fmax = f[0][0];
fmin = fmax;
for( int i=0; i < nx; i++ )
for( int j=0; j < ny; j++ ) {
if (f[i][j] < fmin) fmin = f[i][j];
if (f[i][j] > fmax) fmax = f[i][j];
}
}
// Does a variety of shade plots with discrete colours and patterns.
public static void main( String[] args )
{
x15 x = new x15( args );
}
public x15( String[] args )
{
int i, j;
double xx;
double yy;
double x;
double y;
double[][] z = new double[XPTS][YPTS];
double zmin, zmax;
double[][] xg0 = new double[XPTS][YPTS];
double[][] yg0 = new double[XPTS][YPTS];
// Parse and process command line arguments.
pls.plParseOpts( args, pls.PL_PARSE_FULL | pls.PL_PARSE_NOPROGRAM );
// Initialize plplot.
pls.plinit();
// no need to fiddle with color maps since example uses default cmap0
// and the cmap1 fiddling that x15c.c does is completely irrelevant
// (although interesting).
for( i = 0; i < XPTS; i++ )
{
xx = (double) (i - (XPTS/2)) / (double) (XPTS/2);
for( j = 0; j < YPTS; j++ )
{
yy = ((double) (j - (YPTS/2)) / (double) (YPTS/2)) - 1.;
z[i][j] = xx*xx - yy*yy + (xx - yy)/(xx*xx+yy*yy + 0.1);
x = tr[0] * i + tr[1] * j + tr[2];
y = tr[3] * i + tr[4] * j + tr[5];
// Note xg0 ==> yg1 are one-dimensional because of arrangement of
//zeros in the final tr definition above. However, for now
//we are using raw interface here so must nominally treat them
//as two-dimensional.
xg0[i][j] = x;
yg0[i][j] = y;
}
}
f2mnmx( z, XPTS, YPTS );
zmin = fmin;
zmax = fmax;
plot1( xg0, yg0, z, zmin, zmax );
plot2( xg0, yg0, z, zmin, zmax );
pls.plend();
}
// Illustrates a single shaded region.
void plot1( double[][] xg0, double[][] yg0, double[][] z, double zmin, double zmax)
{
double shade_min, shade_max, sh_color;
int sh_cmap = 0, sh_width;
int min_color = 0, min_width = 0, max_color = 0, max_width = 0;
pls.pladv(0);
pls.plvpor(0.1, 0.9, 0.1, 0.9);
pls.plwind(-1.0, 1.0, -1.0, 1.0);
/* Plot using identity transform */
shade_min = zmin + (zmax-zmin)*0.4;
shade_max = zmin + (zmax-zmin)*0.6;
sh_color = 7;
sh_width = 2;
min_color = 9;
max_color = 2;
min_width = 2;
max_width = 2;
pls.plpsty(8);
pls.plshade( z, -1., 1., -1., 1.,
shade_min, shade_max,
sh_cmap, sh_color, sh_width,
min_color, min_width, max_color, max_width,
1, xg0, yg0 );
pls.plcol0(1);
pls.plbox("bcnst", 0.0, 0, "bcnstv", 0.0, 0);
pls.plcol0(2);
pls.pllab("distance", "altitude", "Bogon flux");
}
// Illustrates multiple adjacent shaded regions, using different fill
// patterns for each region.
void plot2(double[][] xg0, double[][] yg0, double[][] z, double zmin, double zmax)
{
double shade_min, shade_max, sh_color;
int sh_cmap = 0, sh_width;
int min_color = 0, min_width = 0, max_color = 0, max_width = 0;
int i;
sh_width = 2;
pls.pladv(0);
pls.plvpor(0.1, 0.9, 0.1, 0.9);
pls.plwind(-1.0, 1.0, -1.0, 1.0);
/* Plot using identity transform */
for (i = 0; i < 10; i++) {
shade_min = zmin + (zmax - zmin) * i / 10.0;
shade_max = zmin + (zmax - zmin) * (i +1) / 10.0;
sh_color = i+6;
pls.plpsty((i + 2) % 8 + 1);
pls.plshade( z, -1., 1., -1., 1.,
shade_min, shade_max,
sh_cmap, sh_color, sh_width,
min_color, min_width, max_color, max_width,
1, xg0, yg0 );
}
pls.plcol0(1);
pls.plbox("bcnst", 0.0, 0, "bcnstv", 0.0, 0);
pls.plcol0(2);
pls.pllab("distance", "altitude", "Bogon flux");
}
}
//---------------------------------------------------------------------------//
// End of x15.java
//---------------------------------------------------------------------------//
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