Implement script region check

src/main/java/emu/grasscutter/scripts/data/SceneRegion.java

@@ -0,0 +1,57 @@
+package emu.grasscutter.scripts.data;
+
+import emu.grasscutter.game.entity.GameEntity;
+import emu.grasscutter.scripts.constants.ScriptRegionShape;
+import emu.grasscutter.utils.Position;
+import it.unimi.dsi.fastutil.ints.IntOpenHashSet;
+import it.unimi.dsi.fastutil.ints.IntSet;
+
+public class SceneRegion {
+	public int config_id;
+	public int shape;
+	public Position pos;
+	public Position size;
+	
+	private boolean hasNewEntities;
+	private final IntSet entities; // Ids of entities inside this region
+	
+	public SceneRegion() {
+		this.entities = new IntOpenHashSet();
+	}
+	
+	public IntSet getEntities() {
+		return entities;
+	}
+
+	public void addEntity(GameEntity entity) {
+		if (this.getEntities().contains(entity.getId())) {
+			return;
+		}
+		this.getEntities().add(entity.getId());
+		this.hasNewEntities = true;
+	}
+	
+	public void removeEntity(GameEntity entity) {
+		this.getEntities().remove(entity.getId());
+	}
+	
+	public boolean contains(Position p) {
+		switch (shape) {
+			case ScriptRegionShape.CUBIC:
+				return (Math.abs(pos.getX() - p.getX()) <= size.getX()) &&
+				       (Math.abs(pos.getZ() - p.getZ()) <= size.getZ());
+			case ScriptRegionShape.SPHERE:
+				return false;
+		}
+		
+		return false;
+	}
+
+	public boolean hasNewEntities() {
+		return hasNewEntities;
+	}
+	
+	public void resetNewEntities() {
+		hasNewEntities = false;
+	}
+}