public MeshTile[] subdivide(Level nextLevel) {
Angle p0 = this.getSector().getMinLatitude();
Angle p2 = this.getSector().getMaxLatitude();
Angle p1 = Angle.midAngle(p0, p2);
Angle t0 = this.getSector().getMinLongitude();
Angle t2 = this.getSector().getMaxLongitude();
Angle t1 = Angle.midAngle(t0, t2);
int row = this.getRow();
int col = this.getColumn();
MeshCoords[] coords = this.coords.subdivide();
MeshTile[] subTiles = new MeshTile[4];
subTiles[0] =
new MeshTile(
new Sector(p0, p1, t0, t1),
nextLevel,
2 * row,
2 * col,
coords[0]); // Lower left quadrant.
subTiles[1] =
new MeshTile(
new Sector(p0, p1, t1, t2),
nextLevel,
2 * row,
2 * col + 1,
coords[1]); // Lower right quadrant.
subTiles[2] =
new MeshTile(
new Sector(p1, p2, t1, t2),
nextLevel,
2 * row + 1,
2 * col + 1,
coords[2]); // Upper right quadrant
subTiles[3] =
new MeshTile(
new Sector(p1, p2, t0, t1),
nextLevel,
2 * row + 1,
2 * col,
coords[3]); // Upper left quadrant.
return subTiles;
}
