SimGear: SGEnlargeBoundingBox.cxx Source File

00001 /* -*-c++-*-
00002  *
00003  * Copyright (C) 2006-2007 Mathias Froehlich 
00004  *
00005  * This program is free software; you can redistribute it and/or
00006  * modify it under the terms of the GNU General Public License as
00007  * published by the Free Software Foundation; either version 2 of the
00008  * License, or (at your option) any later version.
00009  *
00010  * This program is distributed in the hope that it will be useful, but
00011  * WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013  * General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU General Public License
00016  * along with this program; if not, write to the Free Software
00017  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
00018  * MA 02110-1301, USA.
00019  *
00020  */
00021 
00022 #ifdef HAVE_CONFIG_H
00023 #  include <simgear_config.h>
00024 #endif
00025 
00026 #include "SGEnlargeBoundingBox.hxx"
00027 #include <osg/Drawable>
00028 
00029 SGEnlargeBoundingBox::SGEnlargeBoundingBox(float offset) :
00030   _offset(offset)
00031 {
00032 }
00033 
00034 SGEnlargeBoundingBox::SGEnlargeBoundingBox(const SGEnlargeBoundingBox& cb,
00035                                            const osg::CopyOp& copyOp) :
00036   osg::Drawable::ComputeBoundingBoxCallback(cb, copyOp),
00037   _offset(cb._offset)
00038 {
00039 }
00040 
00041 osg::BoundingBox
00042 SGEnlargeBoundingBox::computeBound(const osg::Drawable& drawable) const
00043 {
00044   osg::BoundingBox bound = drawable.computeBound();
00045   if (!bound.valid())
00046     return bound;
00047   return osg::BoundingBox(bound._min - osg::Vec3(_offset, _offset, _offset),
00048                           bound._max + osg::Vec3(_offset, _offset, _offset));
00049 }