C++ Vec3d::x方法代码示例

LargeScaleCoord::LargeScaleCoord(const osg::Vec3d& realCoord)
{
    m_smallScale.set(0, 0, 0);
    m_largeScale.set(realCoord.x() / sizeFactor, realCoord.y() / sizeFactor, realCoord.z() / sizeFactor);
}

bool
ElevationQuery::getElevationImpl(const osg::Vec3d&       point,
                                 const SpatialReference* pointSRS,
                                 double&                 out_elevation,
                                 double                  desiredResolution,
                                 double*                 out_actualResolution)
{
    if ( _maxDataLevel == 0 || _tileSize == 0 )
    {
        // this means there are no heightfields.
        out_elevation = 0.0;
        return true;
    }
   
    // this is the ideal LOD for the requested resolution:
    unsigned int idealLevel = desiredResolution > 0.0
        ? _mapf.getProfile()->getLevelOfDetailForHorizResolution( desiredResolution, _tileSize )
        : _maxDataLevel;        

    // based on the heightfields available, this is the best we can theorically do:
    unsigned int bestAvailLevel = osg::minimum( idealLevel, _maxDataLevel );
    if (_maxLevelOverride >= 0)
    {
        bestAvailLevel = osg::minimum(bestAvailLevel, (unsigned int)_maxLevelOverride);
    }
    
    // transform the input coords to map coords:
    osg::Vec3d mapPoint = point;
    if ( pointSRS && !pointSRS->isEquivalentTo( _mapf.getProfile()->getSRS() ) )
    {
        if ( !pointSRS->transform2D( point.x(), point.y(), _mapf.getProfile()->getSRS(), mapPoint.x(), mapPoint.y() ) )
        {
            OE_WARN << LC << "Fail: coord transform failed" << std::endl;
            return false;
        }
    }

    osg::ref_ptr<osg::HeightField> hf;
    osg::ref_ptr<osgTerrain::TerrainTile> tile;

    // get the tilekey corresponding to the tile we need:
    TileKey key = _mapf.getProfile()->createTileKey( mapPoint.x(), mapPoint.y(), bestAvailLevel );
    if ( !key.valid() )
    {
        OE_WARN << LC << "Fail: coords fall outside map" << std::endl;
        return false;
    }

    // Check the tile cache. Note that the TileSource already likely has a MemCache
    // attached to it. We employ a secondary cache here for a couple reasons. One, this
    // cache will store not only the heightfield, but also the tesselated tile in the event
    // that we're using GEOMETRIC mode. Second, since the call the getHeightField can 
    // fallback on a lower resolution, this cache will hold the final resolution heightfield
    // instead of trying to fetch the higher resolution one each tiem.

    TileCache::Record record = _tileCache.get( key );
    if ( record.valid() )
        tile = record.value().get();
         
    // if we found it, make sure it has a heightfield in it:
    if ( tile.valid() )
    {
        osgTerrain::HeightFieldLayer* layer = dynamic_cast<osgTerrain::HeightFieldLayer*>(tile->getElevationLayer());
        if ( layer )
            hf = layer->getHeightField();

        if ( !hf.valid() )
            tile = 0L;
    }

    // if we didn't find it (or it didn't have heightfield data), build it.
    if ( !tile.valid() )
    {
        // generate the heightfield corresponding to the tile key, automatically falling back
        // on lower resolution if necessary:
        _mapf.getHeightField( key, true, hf, 0L, _interpolation );

        // bail out if we could not make a heightfield a all.
        if ( !hf.valid() )
        {
            OE_WARN << LC << "Unable to create heightfield for key " << key.str() << std::endl;
            return false;
        }

        // All this stuff is requires for GEOMETRIC mode. An optimization would be to
        // defer this so that PARAMETRIC mode doesn't waste time
        GeoLocator* locator = GeoLocator::createForKey( key, _mapf.getMapInfo() );

        tile = new osgTerrain::TerrainTile();

        osgTerrain::HeightFieldLayer* layer = new osgTerrain::HeightFieldLayer( hf.get() );
        layer->setLocator( locator );

        tile->setElevationLayer( layer );
        tile->setRequiresNormals( false );
        tile->setTerrainTechnique( new osgTerrain::GeometryTechnique );

        // store it in the local tile cache.
        _tileCache.insert( key, tile.get() );
    }
//.........这里部分代码省略.........

bool LineSegmentIntersector::intersectAndClip(osg::Vec3d& s, osg::Vec3d& e,const osg::BoundingBox& bbInput)
{
    osg::Vec3d bb_min(bbInput._min);
    osg::Vec3d bb_max(bbInput._max);

#if 1
    double epsilon = 1e-4;
    bb_min.x() -= epsilon;
    bb_min.y() -= epsilon;
    bb_min.z() -= epsilon;
    bb_max.x() += epsilon;
    bb_max.y() += epsilon;
    bb_max.z() += epsilon;
#endif

    // compate s and e against the xMin to xMax range of bb.
    if (s.x()<=e.x())
    {

        // trivial reject of segment wholely outside.
        if (e.x()<bb_min.x()) return false;
        if (s.x()>bb_max.x()) return false;

        if (s.x()<bb_min.x())
        {
            // clip s to xMin.
            s = s+(e-s)*(bb_min.x()-s.x())/(e.x()-s.x());
        }

        if (e.x()>bb_max.x())
        {
            // clip e to xMax.
            e = s+(e-s)*(bb_max.x()-s.x())/(e.x()-s.x());
        }
    }
    else
    {
        if (s.x()<bb_min.x()) return false;
        if (e.x()>bb_max.x()) return false;

        if (e.x()<bb_min.x())
        {
            // clip s to xMin.
            e = s+(e-s)*(bb_min.x()-s.x())/(e.x()-s.x());
        }

        if (s.x()>bb_max.x())
        {
            // clip e to xMax.
            s = s+(e-s)*(bb_max.x()-s.x())/(e.x()-s.x());
        }
    }

    // compate s and e against the yMin to yMax range of bb.
    if (s.y()<=e.y())
    {

        // trivial reject of segment wholely outside.
        if (e.y()<bb_min.y()) return false;
        if (s.y()>bb_max.y()) return false;

        if (s.y()<bb_min.y())
        {
            // clip s to yMin.
            s = s+(e-s)*(bb_min.y()-s.y())/(e.y()-s.y());
        }

        if (e.y()>bb_max.y())
        {
            // clip e to yMax.
            e = s+(e-s)*(bb_max.y()-s.y())/(e.y()-s.y());
        }
    }
    else
    {
        if (s.y()<bb_min.y()) return false;
        if (e.y()>bb_max.y()) return false;

        if (e.y()<bb_min.y())
        {
            // clip s to yMin.
            e = s+(e-s)*(bb_min.y()-s.y())/(e.y()-s.y());
        }

        if (s.y()>bb_max.y())
        {
            // clip e to yMax.
            s = s+(e-s)*(bb_max.y()-s.y())/(e.y()-s.y());
        }
    }

    // compate s and e against the zMin to zMax range of bb.
    if (s.z()<=e.z())
    {

        // trivial reject of segment wholely outside.
        if (e.z()<bb_min.z()) return false;
        if (s.z()>bb_max.z()) return false;

        if (s.z()<bb_min.z())
//.........这里部分代码省略.........

bool Locator::computeLocalBounds(Locator& source, osg::Vec3d& bottomLeft, osg::Vec3d& topRight) const
{
    typedef std::list<osg::Vec3d> Corners;
    Corners corners;

    osg::Vec3d cornerNDC;
    if (convertLocalToModel(osg::Vec3d(0.0,0.0,0.0), cornerNDC))
    {
        corners.push_back(cornerNDC);
    }

    if (convertLocalToModel(osg::Vec3d(1.0,0.0,0.0), cornerNDC))
    {
        corners.push_back(cornerNDC);
    }

    if (convertLocalToModel(osg::Vec3d(0.0,1.0,0.0), cornerNDC))
    {
        corners.push_back(cornerNDC);
    }

    if (convertLocalToModel(osg::Vec3d(1.0,1.0,0.0), cornerNDC))
    {
        corners.push_back(cornerNDC);
    }

    if (convertLocalToModel(osg::Vec3d(0.0,0.0,1.0), cornerNDC))
    {
        corners.push_back(cornerNDC);
    }

    if (convertLocalToModel(osg::Vec3d(1.0,0.0,1.0), cornerNDC))
    {
        corners.push_back(cornerNDC);
    }

    if (convertLocalToModel(osg::Vec3d(0.0,1.0,1.0), cornerNDC))
    {
        corners.push_back(cornerNDC);
    }

    if (convertLocalToModel(osg::Vec3d(1.0,1.0,1.0), cornerNDC))
    {
        corners.push_back(cornerNDC);
    }

    if (corners.empty()) return false;


    for(Corners::iterator itr = corners.begin();
        itr != corners.end();
        ++itr)
    {
        bottomLeft.x() = osg::minimum( bottomLeft.x(), itr->x());
        bottomLeft.y() = osg::minimum( bottomLeft.y(), itr->y());
        bottomLeft.z() = osg::minimum( bottomLeft.z(), itr->z());
        topRight.x() = osg::maximum( topRight.x(), itr->x());
        topRight.y() = osg::maximum( topRight.y(), itr->y());
        topRight.z() = osg::maximum( topRight.z(), itr->z());
    }
    
    return true;
}

bool
MercatorLocator::convertModelToLocal(const osg::Vec3d& world, osg::Vec3d& local) const
{
    bool result = false;

    // required becasue of an OSG bug
    if ( !_inverseCalculated )
    {
        const_cast<MercatorLocator*>(this)->_inverse.invert( _transform );
        const_cast<MercatorLocator*>(this)->_inverseCalculated = true;
    }

    switch(_coordinateSystemType)
    {
    case(GEOCENTRIC):
        {
            double longitude, latitude, height;

            _ellipsoidModel->convertXYZToLatLongHeight(world.x(), world.y(), world.z(),
                latitude, longitude, height );

            local = osg::Vec3d(longitude, latitude, height) * _inverse;

            double lon_deg = osg::RadiansToDegrees(longitude);
            double lat_deg = osg::RadiansToDegrees(latitude);
            double xr, yr;

            getUV( _geoDataExtent, lon_deg, lat_deg, xr, yr );

            local.x() = xr;
            local.y() = 1.0-yr;
            result = true;
        }
        break;


    case(GEOGRAPHIC):
        {        
            local = world * _inverse;

            osg::Vec3d w = world;
            double lon_deg = w.x();
            double lat_deg = w.y();

            double xr, yr;
            getUV( _geoDataExtent, lon_deg, lat_deg, xr, yr );

            local.x() = xr;
            local.y() = 1.0-yr;
            result = true;
        }
        break;

    case(PROJECTED):
        {        
            local = world * _inverse;
            result = true;      
        }
        break;
    }

    return result;
}