public void apply(ConveyorTile convTile) throws RequestFilterException {
TileLayer tl = convTile.getLayer();
// SRS srs = convTile.getSRS();
GridSubset gridSubset = tl.getGridSubset(convTile.getGridSetId());
int z = (int) convTile.getTileIndex()[2];
long[] gridCoverage = gridSubset.getCoverage(z);
// Figure out the radius
long width = gridCoverage[2] - gridCoverage[0];
long height = gridCoverage[3] - gridCoverage[1];
// Rounding must always err on the side of
// caution if you want to use KML hierarchies
long maxRad = 0;
if (width > height) {
maxRad = (width / 4) + 1;
} else {
maxRad = (height / 4) + 1;
}
// Figure out how the requested bounds relate
long midX = gridCoverage[0] + width / 2;
long midY = gridCoverage[1] + height / 2;
long xDist = midX - convTile.getTileIndex()[0];
long yDist = midY - convTile.getTileIndex()[1];
long rad = Math.round(Math.sqrt(xDist * xDist + yDist * yDist));
if (rad > maxRad) {
throw new BlankTileException(this);
}
}
