Enforce Entities exist on only one object layer at the same time

api/src/main/java/com/bartlomiejpluta/base/api/entity/Entity.java

@@ -22,6 +22,8 @@ public interface Entity extends Movable, Renderable, Updatable {
 
    Direction getDirectionTowards(Entity target);
 
+   ObjectLayer getLayer();
+
    void onAdd(ObjectLayer layer);
 
    void onRemove(ObjectLayer layer);

api/src/main/java/com/bartlomiejpluta/base/api/move/Movable.java

@@ -32,4 +32,6 @@ public interface Movable extends Placeable {
    int manhattanDistance(Vector2ic coordinates);
 
    boolean move(Movement movement);
+
+   void abortMove();
 }

api/src/main/java/com/bartlomiejpluta/base/api/move/Movement.java

@@ -26,6 +26,10 @@ public final class Movement {
       return object.move(this);
    }
 
+   public void abort() {
+      object.abortMove();
+   }
+
    public Movement another() {
       return object.prepareMovement(direction);
    }

api/src/main/java/com/bartlomiejpluta/base/lib/animation/AnimationDelegate.java

@@ -200,6 +200,11 @@ public abstract class AnimationDelegate implements Animation {
       return animation.move(movement);
    }
 
+   @Override
+   public void abortMove() {
+      animation.abortMove();
+   }
+
    @Override
    public void onAdd(Layer layer) {
       animation.onAdd(layer);

api/src/main/java/com/bartlomiejpluta/base/lib/entity/EntityDelegate.java

@@ -194,6 +194,11 @@ public abstract class EntityDelegate implements Entity {
       return entity.getModelMatrix();
    }
 
+   @Override
+   public ObjectLayer getLayer() {
+      return entity.getLayer();
+   }
+
    @Override
    public void onAdd(ObjectLayer layer) {
       entity.onAdd(layer);
@@ -234,6 +239,11 @@ public abstract class EntityDelegate implements Entity {
       return entity.move(movement);
    }
 
+   @Override
+   public void abortMove() {
+      entity.abortMove();
+   }
+
    @Override
    public void update(float dt) {
       entity.update(dt);

engine/src/main/java/com/bartlomiejpluta/base/engine/world/entity/model/DefaultEntity.java

@@ -40,6 +40,9 @@ public class DefaultEntity extends MovableSprite implements Entity {
    @Setter
    private boolean blocking;
 
+   @Getter
+   private ObjectLayer layer;
+
    public DefaultEntity(Mesh mesh, EntitySetManager entitySetManager, Map<Direction, Integer> spriteDirectionRows, Map<Direction, Vector2fc> spriteDefaultRows, String entitySetUid) {
       super(mesh, entitySetManager.loadObject(requireNonNull(entitySetUid)));
       this.entitySetManager = entitySetManager;
@@ -124,12 +127,12 @@ public class DefaultEntity extends MovableSprite implements Entity {
 
    @Override
    public void onAdd(ObjectLayer layer) {
-      // Do nothing
+      this.layer = layer;
    }
 
    @Override
    public void onRemove(ObjectLayer layer) {
-      // Do nothing
+      this.layer = null;
    }
 
    @Override

engine/src/main/java/com/bartlomiejpluta/base/engine/world/map/layer/object/DefaultObjectLayer.java

@@ -68,6 +68,13 @@ public class DefaultObjectLayer extends BaseLayer implements ObjectLayer {
 
    @Override
    public void addEntity(Entity entity) {
+      var layer = (DefaultObjectLayer) entity.getLayer();
+
+      if (layer != null) {
+         layer.entities.remove(entity);
+      }
+
+      entity.setStepSize(stepSize.x(), stepSize.y());
       entitiesToAdd.add(entity);
    }
 
@@ -153,7 +160,6 @@ public class DefaultObjectLayer extends BaseLayer implements ObjectLayer {
       if(!entitiesToAdd.isEmpty()) {
          for (var entity : entitiesToAdd) {
             entity.onAdd(this);
-            entity.setStepSize(stepSize.x(), stepSize.y());
             entities.add(entity);
          }
 

engine/src/main/java/com/bartlomiejpluta/base/engine/world/movement/MovableSprite.java

@@ -105,6 +105,14 @@ public abstract class MovableSprite extends AnimatedSprite implements Movable, U
       return true;
    }
 
+   @Override
+   public void abortMove() {
+      setCoordinates(movement.getFrom());
+      setDefaultAnimationFrame();
+      movementVector = null;
+      movement = null;
+   }
+
    @Override
    public void setCoordinates(int x, int y) {
       coordinates.x = x;