void TileMap::computeMinMaxLevel()
{
_minLevel = INT_MAX;
_maxLevel = 0;
for (TileSetList::iterator itr = _tileSets.begin(); itr != _tileSets.end(); ++itr)
{
if (itr->getOrder() < _minLevel) _minLevel = itr->getOrder();
if (itr->getOrder() > _maxLevel) _maxLevel = itr->getOrder();
}
}
std::string
TileMap::getURL(const osgEarth::TileKey& tilekey, bool invertY)
{
if (!intersectsKey(tilekey))
{
//OE_NOTICE << LC << "No key intersection for tile key " << tilekey.str() << std::endl;
return "";
}
unsigned int zoom = tilekey.getLevelOfDetail();
unsigned int x, y;
tilekey.getTileXY(x, y);
//Some TMS like services swap the Y coordinate so 0,0 is the upper left rather than the lower left. The normal TMS
//specification has 0,0 at the bottom left, so inverting Y will make 0,0 in the upper left.
//http://code.google.com/apis/maps/documentation/overlays.html#Google_Maps_Coordinates
if (!invertY)
{
unsigned int numRows, numCols;
tilekey.getProfile()->getNumTiles(tilekey.getLevelOfDetail(), numCols, numRows);
y = numRows - y - 1;
}
//OE_NOTICE << LC << "KEY: " << tilekey.str() << " level " << zoom << " ( " << x << ", " << y << ")" << std::endl;
//Select the correct TileSet
if ( _tileSets.size() > 0 )
{
for (TileSetList::iterator itr = _tileSets.begin(); itr != _tileSets.end(); ++itr)
{
if (itr->getOrder() == zoom)
{
std::stringstream ss;
std::string path = osgDB::getFilePath(_filename);
ss << path << "/" << zoom << "/" << x << "/" << y << "." << _format.getExtension();
//OE_NOTICE << LC << "Returning URL " << ss.str() << std::endl;
std::string ssStr;
ssStr = ss.str();
return ssStr;
}
}
}
else // Just go with it. No way of knowing the max level.
{
std::stringstream ss;
std::string path = osgDB::getFilePath(_filename);
ss << path << "/" << zoom << "/" << x << "/" << y << "." << _format.getExtension();
std::string ssStr;
ssStr = ss.str();
return ssStr;
}
return "";
}