/usr/share/doc/libplplot12/examples/c++/x02.cc is in libplplot-dev 5.10.0+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// $Id: x02.cc 12288 2013-01-30 04:40:35Z airwin $
//--------------------------------------------------------------------------
//
//--------------------------------------------------------------------------
// Copyright (C) 2004,2005 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 2 in C++.
//--------------------------------------------------------------------------
#include "plc++demos.h"
#ifdef PL_USE_NAMESPACE
using namespace std;
#endif
class x02 {
public:
x02( int, const char ** );
private:
void demo1();
void demo2();
void draw_windows( int nw, int cmap0_offset );
// Class data
plstream *pls;
};
//--------------------------------------------------------------------------
// demo1
//
// Demonstrates multiple windows and default color map 0 palette.
//--------------------------------------------------------------------------
void
x02::demo1()
{
pls->bop();
// Divide screen into 16 regions.
pls->ssub( 4, 4 );
draw_windows( 16, 0 );
pls->eop();
}
//--------------------------------------------------------------------------
// demo1
//
// Demonstrates multiple windows and default color map 0 palette.
//--------------------------------------------------------------------------
void
x02::demo2()
{
// Set up cmap0
// Use 100 custom colors in addition to base 16
PLINT r[116], g[116], b[116];
// Min and max lightness values
PLFLT lmin = 0.15, lmax = 0.85;
int i;
pls->bop();
// Divide screen into 100 regions.
pls->ssub( 10, 10 );
for ( i = 0; i <= 99; i++ )
{
PLFLT h, l, s;
PLFLT r1, g1, b1;
// Bounds on HLS, from plhlsrgb() commentary --
// hue [0., 360.] degrees
// lightness [0., 1.] magnitude
// saturation [0., 1.] magnitude
//
// Vary hue uniformly from left to right
h = ( 360. / 10. ) * ( i % 10 );
// Vary lightness uniformly from top to bottom, between min & max
l = lmin + ( lmax - lmin ) * ( i / 10 ) / 9.;
// Use max saturation
s = 1.0;
pls->hlsrgb( h, l, s, &r1, &g1, &b1 );
r[i + 16] = (PLINT) ( r1 * 255.001 );
g[i + 16] = (PLINT) ( g1 * 255.001 );
b[i + 16] = (PLINT) ( b1 * 255.001 );
}
// Load default cmap0 colors into our custom set
for ( i = 0; i <= 15; i++ )
pls->gcol0( i, r[i], g[i], b[i] );
// Now set cmap0 all at once (faster, since fewer driver calls)
pls->scmap0( r, g, b, 116 );
draw_windows( 100, 16 );
pls->eop();
}
//--------------------------------------------------------------------------
// draw_windows
//
// Draws a set of numbered boxes with colors according to cmap0 entry.
//--------------------------------------------------------------------------
void
x02::draw_windows( int nw, int cmap0_offset )
{
int i, j;
PLFLT vmin, vmax;
char text[3];
pls->schr( 0.0, 3.5 );
pls->font( 4 );
for ( i = 0; i < nw; i++ )
{
pls->col0( i + cmap0_offset );
sprintf( text, "%d", i );
pls->adv( 0 );
vmin = 0.1;
vmax = 0.9;
for ( j = 0; j <= 2; j++ )
{
pls->width( j + 1 );
pls->vpor( vmin, vmax, vmin, vmax );
pls->wind( 0.0, 1.0, 0.0, 1.0 );
pls->box( "bc", 0.0, 0, "bc", 0.0, 0 );
vmin = vmin + 0.1;
vmax = vmax - 0.1;
}
pls->width( 1 );
pls->ptex( 0.5, 0.5, 1.0, 0.0, 0.5, text );
}
}
x02::x02( int argc, const char ** argv )
{
// plplot initialization
pls = new plstream();
// Parse and process command line arguments.
pls->parseopts( &argc, argv, PL_PARSE_FULL );
// Initialize PLplot.
pls->init();
demo1();
demo2();
//pls->end();
delete pls;
}
int main( int argc, const char ** argv )
{
x02 *x = new x02( argc, argv );
delete x;
}
//--------------------------------------------------------------------------
// End of x02.cc
//--------------------------------------------------------------------------
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