89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
// trinodes.cxx -- "Triangle" nodes management class
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//
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// Written by Curtis Olson, started March 1999.
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//
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// Copyright (C) 1999 Curtis L. Olson - curt@flightgear.org
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id$
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// (Log is kept at end of this file)
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#include "trinodes.hxx"
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// Constructor
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FGTriNodes::FGTriNodes( void ) {
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}
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// Destructor
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FGTriNodes::~FGTriNodes( void ) {
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}
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// return true of the two points are "close enough" as defined by
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// FG_PROXIMITY_EPSILON
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inline bool FGTriNodes::close_enough( const Point3D& p1, const Point3D& p2 ) {
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if ( ( fabs(p1.x() - p2.x()) < FG_PROXIMITY_EPSILON ) &&
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( fabs(p1.y() - p2.y()) < FG_PROXIMITY_EPSILON ) ) {
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return true;
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} else {
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return false;
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}
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}
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// Add a point to the point list if it doesn't already exist. Returns
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// the index (starting at zero) of the point in the list.
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int FGTriNodes::unique_add( const Point3D& p ) {
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trinode_list_iterator current, last;
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int counter = 0;
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// cout << p.x() << "," << p.y() << endl;
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// see if point already exists
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current = node_list.begin();
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last = node_list.end();
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for ( ; current != last; ++current ) {
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if ( close_enough(p, *current) ) {
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// cout << "found an existing match!" << endl;
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return counter;
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}
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++counter;
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}
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// add to list
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node_list.push_back( p );
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return counter;
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}
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// $Log$
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// Revision 1.3 1999/03/20 02:21:54 curt
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// Continue shaping the code towards triangulation bliss. Added code to
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// calculate some point guaranteed to be inside a polygon.
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//
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// Revision 1.2 1999/03/19 00:27:12 curt
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// Continued work on triangulation preparation.
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//
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// Revision 1.1 1999/03/17 23:52:00 curt
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// Initial revision.
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//
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