/usr/share/doc/libplplot12/examples/c++/x13.cc is in libplplot-dev 5.10.0+dfsg2-0.1ubuntu2.
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: x13.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 13 in C++.
//--------------------------------------------------------------------------
#include "plc++demos.h"
#ifdef PL_USE_NAMESPACE
using namespace std;
#endif
static const char* text[] = { "Maurice", "Geoffrey", "Alan", "Rafael", "Vince" };
static int per[] = { 10, 32, 12, 30, 16 };
class x13 {
public:
x13( int, const char ** );
private:
// Class data
plstream *pls;
};
x13::x13( int argc, const char ** argv )
{
int i, j, dthet, theta0, theta1, theta;
PLFLT just, dx, dy;
PLFLT *x = new PLFLT[ 500 ];
PLFLT *y = new PLFLT[ 500 ];
// plplot initialization
pls = new plstream();
// Parse and process command line arguments.
pls->parseopts( &argc, argv, PL_PARSE_FULL );
// Initialize PLplot.
pls->init();
pls->adv( 0 );
// Ensure window has aspect ratio of one so circle is
// plotted as a circle.
pls->vasp( 1.0 );
pls->wind( 0., 10., 0., 10. );
//pls->env(0., 10., 0., 10., 1, -2);
pls->col0( 2 );
// n.b. all theta quantities scaled by 2*pi/500 to be integers to avoid
// floating point logic problems.
theta0 = 0;
dthet = 1;
for ( i = 0; i <= 4; i++ )
{
j = 0;
x[j] = 5.;
y[j++] = 5.;
// n.b. the theta quantities multiplied by 2*pi/500 afterward so
// in fact per is interpreted as a percentage.
theta1 = theta0 + 5 * per[i];
if ( i == 4 )
theta1 = 500;
for ( theta = theta0; theta <= theta1; theta += dthet )
{
x[j] = 5 + 3 * cos( ( 2. * M_PI / 500. ) * theta );
y[j++] = 5 + 3 * sin( ( 2. * M_PI / 500. ) * theta );
}
pls->col0( i + 1 );
pls->psty( ( i + 3 ) % 8 + 1 );
pls->fill( j, x, y );
pls->col0( 1 );
pls->line( j, x, y );
just = ( 2. * M_PI / 500. ) * ( theta0 + theta1 ) / 2.;
dx = .25 * cos( just );
dy = .25 * sin( just );
if ( ( theta0 + theta1 ) < 250 || ( theta0 + theta1 ) > 750 )
just = 0.;
else
just = 1.;
pls->ptex( ( x[j / 2] + dx ), ( y[j / 2] + dy ), 1.0, 0.0, just, text[i] );
theta0 = theta - dthet;
}
pls->font( 2 );
pls->schr( 0., 1.3 );
pls->ptex( 5.0, 9.0, 1.0, 0.0, 0.5, "Percentage of Sales" );
// pls->end();
delete[] x;
delete[] y;
delete pls;
}
int main( int argc, const char ** argv )
{
x13 *x = new x13( argc, argv );
delete x;
}
//--------------------------------------------------------------------------
// End of x13.cc
//--------------------------------------------------------------------------
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