Keep track of loaded chunks

src/main/java/com/yes/yes/world/Chunk.java

@@ -7,8 +7,8 @@ import javafx.scene.paint.Color;
 import javafx.scene.shape.Rectangle;
 
 public class Chunk extends GridPane {
-    private static final int CHUNK_SIZE = 8;
-    private static final double ENTITY_SIZE = 50;
+    public static final int CHUNK_SIZE = 8;
+    public static final int ENTITY_SIZE = 50;
     private final Entity[] data = new Entity[CHUNK_SIZE * CHUNK_SIZE];
 
     public Chunk() {
@@ -23,7 +23,6 @@ public class Chunk extends GridPane {
 
 
                 Rectangle rect = new Rectangle(ENTITY_SIZE, ENTITY_SIZE);
-                //rect.setFill(Color.color((i+j*16)/257d,(i+j*16)/257d, (i+j*16)/257d,1)); //DEBUG CODE
                 rect.setFill(null);
                 rect.setStroke(Color.BLACK);
                 rect.strokeWidthProperty().set(0.5);

src/main/java/com/yes/yes/world/World.java

@@ -1,36 +1,53 @@
 package com.yes.yes.world;
 
 import com.yes.yes.utils.Coordinate;
+import com.yes.yes.utils.exceptions.ChunkAlreadyExistsException;
+import javafx.scene.layout.ColumnConstraints;
 import javafx.scene.layout.GridPane;
+import javafx.scene.layout.RowConstraints;
 
 import java.util.HashMap;
 
 public class World extends GridPane {
     private final HashMap<Coordinate, Chunk> chunks = new HashMap<>();
+    private final HashMap<Coordinate, Chunk> loadedChunks = new HashMap<>();
 
     public World() {
         super();
-
-        for (int x = 0; x < 3; x++) {//DEBUG CODE
-            for (int y = 0; y < 3; y++) {
-                chunks.put(new Coordinate(x, y), new Chunk());
-                this.add(chunks.get(new Coordinate(x, y)), x, y);
-            }
+        //HACK: Move the world by Integer.MAX_VALUE/-1000 in order to avoid -indexes
+        //      So we need to generate all the column indexes to make alignment correct
+        for (int i = 0; i < (Integer.MAX_VALUE/1000/(Chunk.CHUNK_SIZE*Chunk.ENTITY_SIZE)); i++) {
+            this.getRowConstraints().add(new RowConstraints(Chunk.CHUNK_SIZE*Chunk.ENTITY_SIZE));
+            this.getColumnConstraints().add(new ColumnConstraints(Chunk.CHUNK_SIZE*Chunk.ENTITY_SIZE));
         }
-
-        this.unload(new Coordinate(2, 2)); //END DEBUG CODE
     }
 
     public void unload(Coordinate pos) {
-        this.getChildren().remove(chunks.get(pos));
+        Chunk chunk = getChunk(pos);
+        this.getChildren().remove(chunk);
+        loadedChunks.remove(pos);
+
+        System.out.println("Unloading: " + pos.x + "; " + pos.y);
     }
 
     public void load(Coordinate pos) {
-        this.add(chunks.get(pos), pos.x, pos.y);
+        if(loadedChunks.containsKey(pos)) return;
+
+        Chunk chunk = getChunk(pos);
+        this.add(chunk, pos.x, pos.y);
+        loadedChunks.put(pos, chunk);
+        System.out.println("Loading: " + pos.x + "; " + pos.y);
+    }
+
+    public void addChunk(Coordinate pos) throws ChunkAlreadyExistsException {
+        if (chunks.get(pos) == null) {
+            chunks.put(pos, new Chunk());
+        } else {
+            throw new ChunkAlreadyExistsException();
+        }
     }
 
     public Chunk getChunk(Coordinate pos) {
-
         Chunk c = chunks.get(pos);
         if (c == null) {
             c = new Chunk();

src/main/resources/com/yes/yes/main-view.fxml

@@ -5,6 +5,6 @@
 <?import javafx.scene.layout.VBox?>
 
 <?import javafx.scene.control.Button?>
-<VBox alignment="CENTER" spacing="20.0" xmlns:fx="http://javafx.com/fxml"
+<VBox spacing="20.0" xmlns:fx="http://javafx.com/fxml"
       fx:controller="com.yes.yes.MainController" fx:id="root">
 </VBox>