private static MeshTile[] createTiles(LevelSet levelSet, int levelNumber, MeshCoords coords) {
Sector sector = levelSet.getSector();
Level level = levelSet.getLevel(levelNumber);
Angle dLat = level.getTileDelta().getLatitude();
Angle dLon = level.getTileDelta().getLongitude();
Angle latOrigin = levelSet.getTileOrigin().getLatitude();
Angle lonOrigin = levelSet.getTileOrigin().getLongitude();
// Determine the row and column offset from the common World Wind global tiling origin.
int firstRow = Tile.computeRow(dLat, sector.getMinLatitude(), latOrigin);
int firstCol = Tile.computeColumn(dLon, sector.getMinLongitude(), lonOrigin);
int lastRow = Tile.computeRow(dLat, sector.getMaxLatitude(), latOrigin);
int lastCol = Tile.computeColumn(dLon, sector.getMaxLongitude(), lonOrigin);
int numLatTiles = lastRow - firstRow + 1;
int numLonTiles = lastCol - firstCol + 1;
AffineTransform sectorTransform = createTransform(sector, coords);
MeshTile[] tiles = new MeshTile[numLatTiles * numLonTiles];
int index = 0;
Angle p1 = Tile.computeRowLatitude(firstRow, dLat, latOrigin);
for (int row = firstRow; row <= lastRow; row++) {
Angle p2 = p1.add(dLat);
Angle t1 = Tile.computeColumnLongitude(firstCol, dLon, lonOrigin);
for (int col = firstCol; col <= lastCol; col++) {
Angle t2 = t1.add(dLon);
Sector tileSector = new Sector(p1, p2, t1, t2);
MeshCoords tileCoords = transformSector(sectorTransform, tileSector);
tiles[index++] = new MeshTile(tileSector, level, row, col, tileCoords);
t1 = t2;
}
p1 = p2;
}
return tiles;
}
private void createTopLevelTiles() {
MercatorSector sector = (MercatorSector) this.levels.getSector();
Level level = levels.getFirstLevel();
Angle dLat = level.getTileDelta().getLatitude();
Angle dLon = level.getTileDelta().getLongitude();
Angle latOrigin = this.levels.getTileOrigin().getLatitude();
Angle lonOrigin = this.levels.getTileOrigin().getLongitude();
// Determine the row and column offset from the common World Wind global tiling origin.
int firstRow = Tile.computeRow(dLat, sector.getMinLatitude(), latOrigin);
int firstCol = Tile.computeColumn(dLon, sector.getMinLongitude(), lonOrigin);
int lastRow = Tile.computeRow(dLat, sector.getMaxLatitude(), latOrigin);
int lastCol = Tile.computeColumn(dLon, sector.getMaxLongitude(), lonOrigin);
int nLatTiles = lastRow - firstRow + 1;
int nLonTiles = lastCol - firstCol + 1;
this.topLevels = new ArrayList<MercatorTextureTile>(nLatTiles * nLonTiles);
// Angle p1 = Tile.computeRowLatitude(firstRow, dLat);
double deltaLat = dLat.degrees / 90;
double d1 = -1.0 + deltaLat * firstRow;
for (int row = firstRow; row <= lastRow; row++) {
// Angle p2;
// p2 = p1.add(dLat);
double d2 = d1 + deltaLat;
Angle t1 = Tile.computeColumnLongitude(firstCol, dLon, lonOrigin);
for (int col = firstCol; col <= lastCol; col++) {
Angle t2;
t2 = t1.add(dLon);
this.topLevels.add(
new MercatorTextureTile(new MercatorSector(d1, d2, t1, t2), level, row, col));
t1 = t2;
}
d1 = d2;
}
}