tiny_settlement_schule/src/main/java/view/GamePanel.java

package view;

import controller.GameController;
import controller.MouseListener;
import controller.MouseWheelZoom;
import model.GameSaver;
import model.Inventory;
import view.tile.TileManager;
import util.GAMESTATE;
import controller.KeyHandler;
import view.util.screenCoordinatesToWorld;

import javax.swing.*;
import java.awt.*;

public class GamePanel extends JPanel implements screenCoordinatesToWorld {

    //Screen Settings
    final static int originalTileSize = 16;
    final static int scale = 4;

    int fps = 60;

    public GameController gameController;
    public static int static_TileSize = originalTileSize * scale;

    public int tileSize = originalTileSize * scale;
    public int maxScreenCol = 16;
    public int maxScreenRow = 12;
    public int screenWidth = tileSize * maxScreenCol;
    public int screenHeight = tileSize * maxScreenRow;

    // World Settings
    public final int maxWorldCol = 50;
    public final int maxWorldRow = 50;
    public final int worldWidth = tileSize * maxWorldCol;
    public final int worldHeight = tileSize * maxWorldRow;

    //System
    public UI ui = new UI(this);

    // Game State
    public GAMESTATE gameState;



    public TileManager tileManager;
    private InventoryView inventoryView;
    public Camera camera;


    public GamePanel(GameController controller) {

        this.gameController = controller; // get from controller
        this.camera = new Camera(this, controller.getKeyHandler());
        this.tileManager = new TileManager(this);
        Inventory inventory = gameController.getModel().getInventory();
        this.inventoryView = new InventoryView(inventory);



        MouseListener mdl = new MouseListener(controller, this, camera, tileManager);
        this.addMouseListener(mdl);
        this.addMouseMotionListener(mdl);
        this.addMouseWheelListener(new MouseWheelZoom(this));

        this.setPreferredSize(new Dimension(screenWidth, screenHeight));
        this.setBackground(Color.BLACK);
        this.setDoubleBuffered(true);
        this.addKeyListener(controller.getKeyHandler()); // now safe
        this.setFocusable(true);

        gameState = GAMESTATE.PLAY;
    }

    public void zoomInOut(int i){
        if(gameState != GAMESTATE.PLAY){
            return;
        }
        int oldWorldWidth = tileSize * maxWorldCol;
        if((tileSize >= originalTileSize*scale/4 && i < 0) || (tileSize < (originalTileSize * scale) && i > 0)){
            tileSize += i;
        }

        int newWorldWidth = tileSize * maxWorldCol;

        double multiplier = (double)newWorldWidth/oldWorldWidth;
        double newCameraWorldX = camera.worldX * multiplier;
        double newCameraWorldY = camera.worldY * multiplier;

        camera.worldX = (int) newCameraWorldX;
        camera.worldY = (int) newCameraWorldY;
    }
    public InventoryView getInventoryView(){
        return inventoryView;
    }
    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;

        tileManager.draw(g2);
        camera.draw(g2);

        if (gameState == GAMESTATE.INVENTORY) {
            inventoryView.drawInventoryOverlay(g2);
        }

        if (gameState == GAMESTATE.QUIT) {
            GameSaver.saveGame(gameController);
            System.exit(0);
        }
        if(gameState == GAMESTATE.PLAY){
            ui.drawHut(g2);
        }

        ui.draw(g2);
        g2.dispose();
    }
    public void update(){
        if(gameState == GAMESTATE.PLAY || gameState == GAMESTATE.INVENTORY){
            camera.update();
        }
    }

    public int getWorldX(int screenX){
        return (int) (camera.worldX + screenX / (double) tileSize);
    }

    public int getWorldY(int screenY){
        return (int) (camera.worldY + screenY / (double) tileSize);
    }

    public GameController getGameController() {
        if(gameController == null){
            gameController = new GameController();
        }
        return gameController;
    }
}