/usr/share/doc/libplplot12/examples/c++/x11.cc is in libplplot-dev 5.10.0+dfsg-1.
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The actual contents of the file can be viewed below.
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// $Id: x11.cc 12176 2012-02-24 20:33:39Z andrewross $
//--------------------------------------------------------------------------
//
//--------------------------------------------------------------------------
// Copyright (C) 2004 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 11 in C++.
//--------------------------------------------------------------------------
#include "plc++demos.h"
#ifdef PL_USE_NAMESPACE
using namespace std;
#endif
class x11 {
public:
x11( int, const char** );
void cmap1_init();
private:
plstream *pls;
static const int XPTS;
static const int YPTS;
static const int LEVELS;
static const int opt[];
static const PLFLT alt[];
static const PLFLT az[];
static const char *title[];
};
const int x11:: XPTS = 35;
const int x11:: YPTS = 46;
const int x11:: LEVELS = 10;
const int x11:: opt[] = { 3, 3 };
const PLFLT x11::alt[] = { 33.0, 17.0 };
const PLFLT x11::az[] = { 24.0, 115.0 };
const char *x11::title[] = {
"#frPLplot Example 11 - Alt=33, Az=24, Opt=3",
"#frPLplot Example 11 - Alt=17, Az=115, Opt=3"
};
void x11::cmap1_init()
{
PLFLT *i = new PLFLT[2];
PLFLT *h = new PLFLT[2];
PLFLT *l = new PLFLT[2];
PLFLT *s = new PLFLT[2];
bool *rev = new bool[2];
i[0] = 0.0; // left boundary
i[1] = 1.0; // right boundary
h[0] = 240; // blue -> green -> yellow ->
h[1] = 0; // -> red
l[0] = 0.6;
l[1] = 0.6;
s[0] = 0.8;
s[1] = 0.8;
rev[0] = false; // interpolate on front side of colour wheel.
rev[1] = false; // interpolate on front side of colour wheel.
pls->scmap1n( 256 );
pls->scmap1l( false, 2, i, h, l, s, rev );
delete[] i;
delete[] h;
delete[] l;
delete[] s;
delete[] rev;
}
x11::x11( int argc, const char **argv )
{
int i, j, k;
PLFLT *x = new PLFLT[ XPTS ];
PLFLT *y = new PLFLT[ YPTS ];
PLFLT **z;
PLFLT zmin = 1E9, zmax = -1E-9;
PLFLT xx, yy;
int nlevel = LEVELS;
PLFLT *clevel = new PLFLT[LEVELS];
PLFLT step;
pls = new plstream();
// Parse and process command line arguments.
pls->parseopts( &argc, argv, PL_PARSE_FULL );
// Initialize plplot.
pls->init();
// pls->Alloc2dGrid(&z, XPTS, YPTS);
pls->Alloc2dGrid( &z, XPTS, YPTS );
for ( i = 0; i < XPTS; i++ )
x[i] = 3. * (PLFLT) ( i - ( XPTS / 2 ) ) / (PLFLT) ( XPTS / 2 );
for ( j = 0; j < YPTS; j++ )
y[j] = 3. * (PLFLT) ( j - ( YPTS / 2 ) ) / (PLFLT) ( YPTS / 2 );
for ( i = 0; i < XPTS; i++ )
{
xx = x[i];
for ( j = 0; j < YPTS; j++ )
{
yy = y[j];
z[i][j] = 3. * ( 1. - xx ) * ( 1. - xx ) * exp( -( xx * xx ) - ( yy + 1. ) * ( yy + 1. ) ) -
10. * ( xx / 5. - pow( (double) xx, 3. ) - pow( (double) yy, 5. ) ) * exp( -xx * xx - yy * yy ) -
1. / 3. * exp( -( xx + 1 ) * ( xx + 1 ) - ( yy * yy ) );
if ( false ) // Jungfraujoch/Interlaken
{
if ( z[i][j] < -1. )
z[i][j] = -1.;
}
if ( zmin > z[i][j] )
zmin = z[i][j];
if ( zmax < z[i][j] )
zmax = z[i][j];
}
}
step = ( zmax - zmin ) / ( nlevel + 1 );
for ( i = 0; i < nlevel; i++ )
clevel[i] = zmin + step + step * i;
cmap1_init();
for ( k = 0; k < 2; k++ )
{
for ( i = 0; i < 4; i++ )
{
pls->adv( 0 );
pls->col0( 1 );
pls->vpor( 0.0, 1.0, 0.0, 0.9 );
pls->wind( -1.0, 1.0, -1.0, 1.5 );
pls->w3d( 1.0, 1.0, 1.2, -3.0, 3.0, -3.0, 3.0, zmin, zmax,
alt[k], az[k] );
pls->box3( "bnstu", "x axis", 0.0, 0,
"bnstu", "y axis", 0.0, 0,
"bcdmnstuv", "z axis", 0.0, 4 );
pls->col0( 2 );
// wireframe plot
if ( i == 0 )
pls->mesh( x, y, z, XPTS, YPTS, opt[k] );
// magnitude colored wireframe plot
else if ( i == 1 )
pls->mesh( x, y, z, XPTS, YPTS, opt[k] | MAG_COLOR );
// magnitude colored wireframe plot with sides
else if ( i == 2 )
{
pls->plot3d( x, y, z, XPTS, YPTS, opt[k] | MAG_COLOR, true );
}
// magnitude colored wireframe plot with base contour
else if ( i == 3 )
pls->meshc( x, y, z, XPTS, YPTS, opt[k] | MAG_COLOR | BASE_CONT,
clevel, nlevel );
pls->col0( 3 );
pls->mtex( "t", 1.0, 0.5, 0.5, title[k] );
}
}
//pls->end();
pls->Free2dGrid( z, XPTS, YPTS );
delete[] x;
delete[] y;
delete[] clevel;
delete pls;
}
// Does a series of mesh plots for a given data set, with different viewing
// options in each plot.
int main( int argc, const char **argv )
{
x11 *x = new x11( argc, argv );
delete x;
}
//--------------------------------------------------------------------------
// End of x11.cc
//--------------------------------------------------------------------------
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