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

package view;

import controller.MouseListener;
import controller.MouseWheelZoom;
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 Runnable, screenCoordinatesToWorld {

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

    int fps = 60;

    public Inventory inventory;

    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;



    TileManager tileManager = new TileManager(this);
    KeyHandler keyH = new KeyHandler(this);
    Thread gameThread;
    public InventoryView inventoryView = new InventoryView(this);
    public Camera camera = new Camera(this, keyH);


    public GamePanel(){
        inventory = new Inventory(this);

        MouseListener mdl = new MouseListener(this, camera, tileManager, inventoryView);
        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(keyH);
        this.setFocusable(true);

        gameState = GAMESTATE.PLAY;

        System.out.println("Screen Width: " + screenWidth);
        System.out.println("Screen Height: " + screenHeight);
    }

    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 = newCameraWorldX;
        camera.worldY = newCameraWorldY;
    }

    public void startGameThread(){
        gameThread = new Thread(this);
        gameThread.start();
    }

    public void clearAll(Graphics g){
        super.paintComponent(g);
    }

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

    @Override
    public void run() {
        double drawInterval = 1000000000/fps;
        double delta = 0;
        long lastTime = System.nanoTime();
        long currentTime;
        long timer = 0;
        int drawCount = 0;
        while (gameThread != null){
            currentTime = System.nanoTime();

            delta += (currentTime - lastTime) / drawInterval;
            timer += (currentTime - lastTime);
            lastTime = currentTime;
            if(delta >= 1){
                update();
                repaint();
                delta--;
                drawCount++;
            }
            if(timer >= 1000000000){
                //System.out.println("FPS: " + drawCount);
                drawCount = 0;
                timer = 0;
            }
        }
    }

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

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

    public void highlightTile(int screenX, int screenY) {
        System.out.println("Highlight X: " + screenX/tileSize+" Y: "+screenY/tileSize);
    }
}