79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
// trinodes.cxx -- "Triangle" nodes management class
|
|
//
|
|
// Written by Curtis Olson, started March 1999.
|
|
//
|
|
// Copyright (C) 1999 Curtis L. Olson - curt@flightgear.org
|
|
//
|
|
// This program is free software; you can redistribute it and/or
|
|
// modify it under the terms of the GNU General Public License as
|
|
// published by the Free Software Foundation; either version 2 of the
|
|
// License, or (at your option) any later version.
|
|
//
|
|
// This program 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
|
|
// General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program; if not, write to the Free Software
|
|
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
//
|
|
// $Id$
|
|
// (Log is kept at end of this file)
|
|
|
|
|
|
#include "trinodes.hxx"
|
|
|
|
|
|
// Constructor
|
|
FGTriNodes::FGTriNodes( void ) {
|
|
}
|
|
|
|
|
|
// Destructor
|
|
FGTriNodes::~FGTriNodes( void ) {
|
|
}
|
|
|
|
|
|
// return true of the two points are "close enough" as defined by
|
|
// FG_PROXIMITY_EPSILON
|
|
inline bool FGTriNodes::close_enough( const Point3D& p1, const Point3D& p2 ) {
|
|
if ( ( fabs(p1.x() - p2.x()) < FG_PROXIMITY_EPSILON ) &&
|
|
( fabs(p1.y() - p2.y()) < FG_PROXIMITY_EPSILON ) ) {
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
|
|
// Add a point to the point list if it doesn't already exist. Returns
|
|
// the index (starting at zero) of the point in the list.
|
|
int FGTriNodes::unique_add( const Point3D& p ) {
|
|
point_iterator current, last;
|
|
int counter = 0;
|
|
|
|
// see if point already exists
|
|
current = point_list.begin();
|
|
last = point_list.end();
|
|
for ( ; current != last; ++current ) {
|
|
if ( close_enough(p, *current) ) {
|
|
return counter;
|
|
}
|
|
|
|
++counter;
|
|
}
|
|
|
|
// add to list
|
|
point_list.push_back( p );
|
|
|
|
return counter;
|
|
}
|
|
|
|
|
|
// $Log$
|
|
// Revision 1.1 1999/03/17 23:52:00 curt
|
|
// Initial revision.
|
|
//
|
|
|
|
|