properly add / remove things from tiles

src/main/java/xyz/valnet/hadean/gameobjects/worldobjects/Tree.java

@@ -120,8 +120,7 @@ public class Tree extends WorldObject implements ITileThing, ISelectable, IWorka
   @Override
   public void onRemove() {
     Vector2i pos = getWorldPosition().xy();
-    Log log = new Log(pos.x, pos.y);
-    getTile().placeThing(log);
+    add(new Log(pos.x, pos.y));
   }
 
   @Override

src/main/java/xyz/valnet/hadean/gameobjects/worldobjects/WorldObject.java

@@ -3,6 +3,7 @@ package xyz.valnet.hadean.gameobjects.worldobjects;
 import java.util.HashSet;
 import java.util.Set;
 
+import xyz.valnet.engine.math.Vector2i;
 import xyz.valnet.engine.math.Vector4f;
 import xyz.valnet.engine.math.Vector4i;
 import xyz.valnet.engine.scenegraph.GameObject;
@@ -42,6 +43,7 @@ public abstract class WorldObject extends GameObject {
   private void updateTileLinks(Set<Tile> tiles) {
     if(tiles == null || tiles.size() == 0) return;
     if(!(this instanceof ITileThing)) return;
+    boolean inScene = inScene();
 
     Set<Tile> removeTiles = new HashSet<Tile>();
     Set<Tile> addTiles = new HashSet<Tile>();
@@ -58,25 +60,41 @@ public abstract class WorldObject extends GameObject {
 
     for(Tile tile : removeTiles) {
       linkedTiles.remove(tile);
-      tile.remove(this);
+      if(this instanceof ITileThing) {
+        tile.removeThing((ITileThing) this);
+      }
     }
 
     for(Tile tile : addTiles) {
       linkedTiles.add(tile);
+      if(this instanceof ITileThing) {
         tile.placeThing((ITileThing) this);
       }
+    }
+
+    if(linkedTiles.size() == 0 && inScene()) {
+      remove(this);
+    }
+    
+    if(linkedTiles.size() != 0 && !inScene()) {
+      add(this);
+    }
 
   }
 
-  public void setPosition(Vector4i vector) {
+  protected void setPosition(Vector4i vector) {
     setPosition(vector.x, vector.y, vector.z, vector.w);
   }
 
-  public void setPosition(int x, int y) {
+  protected void setPosition(Vector2i vector) {
+    setPosition(vector.x, vector.y);
+  }
+
+  protected void setPosition(int x, int y) {
     setPosition(x, y, 1, 1);
   }
 
-  public void setPosition(int x, int y, int w, int h) {
+  protected void setPosition(int x, int y, int w, int h) {
     this.x = x;
     this.y = y;
     this.w = w;

src/main/java/xyz/valnet/hadean/gameobjects/worldobjects/items/Item.java

@@ -1,6 +1,7 @@
 package xyz.valnet.hadean.gameobjects.worldobjects.items;
 
-import xyz.valnet.engine.math.Vector4f;
+import xyz.valnet.engine.math.Vector2i;
+import xyz.valnet.engine.math.Vector4i;
 import xyz.valnet.hadean.gameobjects.Job;
 import xyz.valnet.hadean.gameobjects.JobBoard;
 import xyz.valnet.hadean.gameobjects.Tile;
@@ -91,4 +92,22 @@ public abstract class Item extends WorldObject implements ISelectable, ITileThin
   public boolean matches(IItemPredicate itemPredicate) {
     return itemPredicate.matches(this);
   }
+
+
+
+  public void setPosition(Vector4i vector) {
+    super.setPosition(vector);
+  }
+
+  public void setPosition(Vector2i vector) {
+    super.setPosition(vector);
+  }
+
+  public void setPosition(int x, int y) {
+    super.setPosition(x, y);
+  }
+
+  public void setPosition(int x, int y, int w, int h) {
+    super.setPosition(x, y, w, h);
+  }
 }

src/main/java/xyz/valnet/hadean/gameobjects/worldobjects/pawn/Pawn.java

@@ -42,9 +42,7 @@ public class Pawn extends Agent {
 
   public void pickupItemByPredicate(IItemPredicate itemPredicate) {
     Item item = getTile().pickupByItemPredicate(itemPredicate);
-    if(item == null) return;
-    remove(item);
-    inventory.add(item);
+    dropoffItem(item);
   }
 
   public void pickupItem(Item i) {
@@ -58,8 +56,8 @@ public class Pawn extends Agent {
     if(!inventory.contains(item)) {
       return;
     }
-    inventory.remove(item);
-    add(item);
+    inventory.remove(add(item));
+    item.setPosition(getWorldPosition().xy());
     getTile().placeThing(item);
   }