unsigned int
TileSource::getMinDataLevel() const
{
//If we have no data extents, just use 0
if (_dataExtents.size() == 0) return 0;
unsigned int minDataLevel = INT_MAX;
for (DataExtentList::const_iterator itr = _dataExtents.begin(); itr != _dataExtents.end(); ++itr)
{
if (itr->getMinLevel() < minDataLevel) minDataLevel = itr->getMinLevel();
}
return minDataLevel;
}
bool
TileSource::hasDataAtLOD( unsigned lod ) const
{
//If no data extents are provided, just return true
if ( _dataExtents.size() == 0 )
return true;
bool intersects = false;
for (DataExtentList::const_iterator itr = _dataExtents.begin(); itr != _dataExtents.end(); ++itr)
{
if ( itr->getMinLevel() <= lod && lod <= itr->getMaxLevel() )
{
intersects = true;
break;
}
}
return intersects;
}
bool
TileSource::hasData(const osgEarth::TileKey& key) const
{
//If no data extents are provided, just return true
if (_dataExtents.size() == 0) return true;
const osgEarth::GeoExtent& keyExtent = key.getExtent();
bool intersectsData = false;
for (DataExtentList::const_iterator itr = _dataExtents.begin(); itr != _dataExtents.end(); ++itr)
{
if (keyExtent.intersects( *itr ) && key.getLevelOfDetail() >= itr->getMinLevel() && key.getLevelOfDetail() <= itr->getMaxLevel())
{
intersectsData = true;
break;
}
}
return intersectsData;
}