C++ GeoHeightField::getExtent方法代码示例

osg::Vec3d getWorld( const GeoHeightField& geoHF, unsigned int c, unsigned int r)
{
    double x = geoHF.getExtent().xMin() + (double)c * geoHF.getXInterval();
    double y = geoHF.getExtent().yMin() + (double)r * geoHF.getYInterval();
    double h = geoHF.getHeightField()->getHeight(c,r);

    osg::Vec3d world;
    GeoPoint point(geoHF.getExtent().getSRS(), x, y, h );
    point.toWorld( world );    
    return world;
}

GeoHeightField
ElevationLayer::createHeightField(const TileKey&    key,
                                  ProgressCallback* progress )
{
    METRIC_SCOPED_EX("ElevationLayer::createHeightField", 2,
                     "key", key.str().c_str(),
                     "name", getName().c_str());

    if (getStatus().isError())
    {
        return GeoHeightField::INVALID;
    }

    // If the layer is disabled, bail out.
    if ( getEnabled() == false )
    {
        return GeoHeightField::INVALID;
    }

    GeoHeightField result;
    osg::ref_ptr<osg::HeightField> hf;
    osg::ref_ptr<NormalMap> normalMap;

    // Check the memory cache first
    bool fromMemCache = false;

    // cache key combines the key with the full signature (incl vdatum)
    // the cache key combines the Key and the horizontal profile.
    std::string cacheKey = Cache::makeCacheKey(
        Stringify() << key.str() << "-" << key.getProfile()->getHorizSignature(),
        "elevation");
    const CachePolicy& policy = getCacheSettings()->cachePolicy().get();

    if ( _memCache.valid() )
    {
        CacheBin* bin = _memCache->getOrCreateDefaultBin();
        ReadResult cacheResult = bin->readObject(cacheKey, 0L);
        if ( cacheResult.succeeded() )
        {
            result = GeoHeightField(
                static_cast<osg::HeightField*>(cacheResult.releaseObject()),
                key.getExtent());

            fromMemCache = true;
        }
    }

    if ( !result.valid() )
    {
        // See if there's a persistent cache.
        CacheBin* cacheBin = getCacheBin( key.getProfile() );

        // Can we continue? Only if either:
        //  a) there is a valid tile source plugin;
        //  b) a tile source is not expected, meaning the subclass overrides getHeightField; or
        //  c) we are in cache-only mode and there is a valid cache bin.
        bool canContinue =
            getTileSource() ||
            !isTileSourceExpected() ||
            (policy.isCacheOnly() && cacheBin != 0L);

        if (!canContinue)
        {
            disable("Error: layer does not have a valid TileSource, cannot create heightfield");
            return GeoHeightField::INVALID;
        }

        // validate the existance of a valid layer profile.
        if ( !policy.isCacheOnly() && !getProfile() )
        {
            disable("Could not establish a valid profile.. did you set one?");
            return GeoHeightField::INVALID;
        }

        // Now attempt to read from the cache. Since the cached data is stored in the
        // map profile, we can try this first.
        bool fromCache = false;

        osg::ref_ptr< osg::HeightField > cachedHF;

        if ( cacheBin && policy.isCacheReadable() )
        {
            ReadResult r = cacheBin->readObject(cacheKey, 0L);
            if ( r.succeeded() )
            {            
                bool expired = policy.isExpired(r.lastModifiedTime());
                cachedHF = r.get<osg::HeightField>();
                if ( cachedHF && validateHeightField(cachedHF.get()) )
                {
                    if (!expired)
                    {
                        hf = cachedHF;
                        fromCache = true;
                    }
                }
            }
        }

        // if we're cache-only, but didn't get data from the cache, fail silently.
        if ( !hf.valid() && policy.isCacheOnly() )
//.........这里部分代码省略.........

GeoHeightField
ElevationLayer::createHeightField(const TileKey&    key,
                                  ProgressCallback* progress )
{
    GeoHeightField result;
    osg::ref_ptr<osg::HeightField> hf;

    // If the layer is disabled, bail out.
    if ( getEnabled() == false )
    {
        return GeoHeightField::INVALID;
    }

    // Check the memory cache first
    if ( _memCache.valid() )
    {
        CacheBin* bin = _memCache->getOrCreateBin( key.getProfile()->getFullSignature() );        
        ReadResult cacheResult = bin->readObject(key.str() );
        if ( cacheResult.succeeded() )
        {
            result = GeoHeightField(
                static_cast<osg::HeightField*>(cacheResult.releaseObject()),
                key.getExtent());
        }
        //_memCache->dumpStats(key.getProfile()->getFullSignature());
    }

    if ( !result.valid() )
    {
        // See if there's a persistent cache.
        CacheBin* cacheBin = getCacheBin( key.getProfile() );

        // validate that we have either a valid tile source, or we're cache-only.
        if ( ! (getTileSource() || (isCacheOnly() && cacheBin) ) )
        {
            OE_WARN << LC << "Error: layer does not have a valid TileSource, cannot create heightfield" << std::endl;
            _runtimeOptions.enabled() = false;
            return GeoHeightField::INVALID;
        }

        // validate the existance of a valid layer profile.
        if ( !isCacheOnly() && !getProfile() )
        {
            OE_WARN << LC << "Could not establish a valid profile" << std::endl;
            _runtimeOptions.enabled() = false;
            return GeoHeightField::INVALID;
        }

        // Now attempt to read from the cache. Since the cached data is stored in the
        // map profile, we can try this first.
        bool fromCache = false;

        osg::ref_ptr< osg::HeightField > cachedHF;

        if ( cacheBin && getCachePolicy().isCacheReadable() )
        {
            ReadResult r = cacheBin->readObject( key.str() );
            if ( r.succeeded() )
            {            
                bool expired = getCachePolicy().isExpired(r.lastModifiedTime());
                cachedHF = r.get<osg::HeightField>();
                if ( cachedHF && validateHeightField(cachedHF) )
                {
                    if (!expired)
                    {
                        hf = cachedHF;
                        fromCache = true;
                    }
                }
            }
        }

        // if we're cache-only, but didn't get data from the cache, fail silently.
        if ( !hf.valid() && isCacheOnly() )
        {
            return GeoHeightField::INVALID;
        }

        if ( !hf.valid() )
        {
            // bad tilesource? fail
            if ( !getTileSource() || !getTileSource()->isOK() )
                return GeoHeightField::INVALID;

            if ( !isKeyInRange(key) )
                return GeoHeightField::INVALID;

            // build a HF from the TileSource.
            hf = createHeightFieldFromTileSource( key, progress );

            // validate it to make sure it's legal.
            if ( hf.valid() && !validateHeightField(hf.get()) )
            {
                OE_WARN << LC << "Driver " << getTileSource()->getName() << " returned an illegal heightfield" << std::endl;
                hf = 0L; // to fall back on cached data if possible.
            }

            // memory cache first:
            if ( hf && _memCache.valid() )
            {
//.........这里部分代码省略.........