145 lines
4.4 KiB
C++
145 lines
4.4 KiB
C++
// trinodes.hxx -- "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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#ifndef _TRINODES_HXX
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#define _TRINODES_HXX
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#include <Include/compiler.h>
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#include <Math/point3d.hxx>
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#include <Main/construct_types.hxx>
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#define FG_PROXIMITY_EPSILON 0.000001
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#define FG_COURSE_EPSILON 0.0003
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class FGTriNodes {
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private:
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point_list node_list;
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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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bool close_enough( const Point3D& p, const Point3D& p );
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// return true of the two points are "close enough" as defined by
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// FG_COURSE_EPSILON
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bool course_close_enough( const Point3D& p1, const Point3D& p2 );
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public:
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// Constructor and destructor
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FGTriNodes( void );
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~FGTriNodes( void );
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// Add a point to the point list if it doesn't already exist.
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// Returns the index (starting at zero) of the point in the list.
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int unique_add( const Point3D& p );
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// Add the point with no uniqueness checking
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int simple_add( const Point3D& p );
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// Add a point to the point list if it doesn't already exist.
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// Returns the index (starting at zero) of the point in the list.
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// Use a course proximity check
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int course_add( const Point3D& p );
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// return the master node list
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inline point_list get_node_list() const { return node_list; }
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// return the ith point
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inline Point3D get_node( int i ) const { return node_list[i]; }
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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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// return true of the two points are "close enough" as defined by
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// FG_COURSE_EPSILON
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inline bool FGTriNodes::course_close_enough( const Point3D& p1,
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const Point3D& p2 )
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{
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if ( ( fabs(p1.x() - p2.x()) < FG_COURSE_EPSILON ) &&
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( fabs(p1.y() - p2.y()) < FG_COURSE_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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#endif // _TRINODES_HXX
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// $Log$
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// Revision 1.7 1999/03/29 13:11:10 curt
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// Shuffled stl type names a bit.
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// Began adding support for tri-fanning (or maybe other arrangments too.)
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//
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// Revision 1.6 1999/03/27 05:30:16 curt
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// Handle corner nodes separately from the rest of the fitted nodes.
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// Add fitted nodes in after corners and polygon nodes since the fitted nodes
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// are less important. Subsequent nodes will "snap" to previous nodes if
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// they are "close enough."
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// Need to manually divide segments to prevent "T" intersetions which can
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// confound the triangulator. Hey, I got to use a recursive method!
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// Pass along correct triangle attributes to output file generator.
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// Do fine grained node snapping for corners and polygons, but course grain
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// node snapping for fitted terrain nodes.
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//
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// Revision 1.5 1999/03/23 22:02:55 curt
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// Refinements in naming and organization.
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//
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// Revision 1.4 1999/03/22 23:49:05 curt
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// Modifications to facilitate conversion to output format.
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//
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// Revision 1.3 1999/03/20 02:21:55 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 22:29:06 curt
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// Working on preparationsn for triangulation.
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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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