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Planetiler is tool to build planet-scale vector tilesets from OpenStreetMap data fast.

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package com.onthegomap.planetiler.geo;

import com.onthegomap.planetiler.archive.WriteableTileArchive;
import java.util.function.IntFunction;
import java.util.function.ToDoubleBiFunction;
import java.util.function.ToIntFunction;

/**
 * Controls the sort order of {@link com.onthegomap.planetiler.collection.FeatureGroup}, which determines the ordering
 * of {@link com.onthegomap.planetiler.archive.TileEncodingResult}s when written to
 * {@link WriteableTileArchive.TileWriter}.
 */
public enum TileOrder {
  TMS(TileCoord::encoded, TileCoord::decode, TileCoord::progressOnLevel),
  HILBERT(TileCoord::hilbertEncoded, TileCoord::hilbertDecode, TileCoord::hilbertProgressOnLevel);

  private final ToIntFunction encode;
  private final IntFunction decode;
  private final ToDoubleBiFunction progressOnLevel;

  private TileOrder(ToIntFunction encode, IntFunction decode,
    ToDoubleBiFunction progressOnLevel) {
    this.encode = encode;
    this.decode = decode;
    this.progressOnLevel = progressOnLevel;
  }

  public int encode(TileCoord coord) {
    return encode.applyAsInt(coord);
  }

  public TileCoord decode(int encoded) {
    return decode.apply(encoded);
  }

  public double progressOnLevel(TileCoord coord, TileExtents extents) {
    return progressOnLevel.applyAsDouble(coord, extents);
  }
}