Created TileGenerator to produce random variations of tiles using specs

core/src/main/java/com/riiablo/map2/TileGenerator.java

@@ -0,0 +1,65 @@
+package com.riiablo.map2;
+
+import com.badlogic.gdx.utils.Array;
+import com.badlogic.gdx.utils.IntMap;
+import com.badlogic.gdx.utils.ObjectSet;
+
+import com.riiablo.map2.DT1.Tile;
+import com.riiablo.map2.random.Random;
+
+public class TileGenerator {
+  ObjectSet<DT1> dt1s;
+  IntMap<Entry> entries;
+
+  final Random random = new Random();
+
+  public void add(DT1 dt1) {
+    dt1s.add(dt1);
+    Tile[] tiles = dt1.tiles;
+    for (int i = 0, s = dt1.numTiles; i < s; i++) {
+      add(tiles[i]);
+    }
+  }
+
+  void add(Tile tile) {
+    // if (tile.rarity <= 0) return;
+    Entry entry = entries.get(tile.tileIndex);
+    if (entry == null) entries.put(tile.tileIndex, entry = new Entry());
+    entry.add(tile);
+  }
+
+  public void dispose() {
+    dt1s.clear();
+    entries.clear();
+  }
+
+  public Tile next(int orientation, int mainIndex, int subIndex) {
+    int id = Tile.Index.create(orientation, mainIndex, subIndex);
+    return next(id);
+  }
+
+  public Tile next(int tileIndex) {
+    Entry entry = entries.get(tileIndex);
+    if (entry == null) return null;
+    int sum = entry.probability;
+    int chance = sum == 0 ? 0 : this.random.nextInt(sum);
+    Tile[] items = entry.tiles.items;
+    Tile tile = null;
+    for (int i = 0, s = entry.tiles.size; i < s && chance > 0; i++) {
+      tile = items[i];
+      chance -= tile.rarity;
+    }
+
+    return tile;
+  }
+
+  static final class Entry {
+    int probability;
+    final Array<Tile> tiles = new Array<>(4);
+
+    void add(Tile tile) {
+      tiles.add(tile);
+      probability += tile.rarity;
+    }
+  }
+}