public void initialize() {

    // openLevelFile images:
    try {
      boxSpriteSheet = ImageIO.read(new File("ItemContainer.png"));
      coinSpriteSheet = ImageIO.read(new File("Coin.png"));
    } catch (Exception e) {
    }

    if (openLevelFile == false) {
      try {
        loadLevel(initLevel);
      } catch (Exception e) {
        System.out.println(e);
      }
    } else {
      loadLevel(FileOpenDialog("Open ..."));
    }

    // create tile layer:
    renderTileLayer();

    // create bg layer:
    backgroundLayer = new VolatileImage[backgroundImage.length];

    // render layer:
    for (int i = 0; i < backgroundImage.length; i++) {
      renderBackgroundLayer(0);
      renderBackgroundLayer(1);
    }

    // create hardware accellerated rendering layer:
    renderImage =
        this.getGraphicsConfiguration()
            .createCompatibleVolatileImage(
                loadedLevel.getWidth() * 16,
                loadedLevel.getHeight() * 16,
                Transparency.TRANSLUCENT);
    Graphics2D g2d = renderImage.createGraphics();
    g2d.setComposite(AlphaComposite.Src);

    // Clear the image.
    g2d.setColor(new Color(0, 0, 0, 0));
    g2d.fillRect(0, 0, renderImage.getWidth(), renderImage.getHeight());
    g2d.setBackground(new Color(0, 0, 0, 0));
  }
  public VolatileImage renderBackgroundLayer(int LayerNumber) {
    // create hardware accellerated background layer (Volatile Image)
    backgroundLayer[LayerNumber] =
        this.getGraphicsConfiguration()
            .createCompatibleVolatileImage(
                loadedLevel.getWidth() * 16,
                loadedLevel.getHeight() * 16,
                Transparency.TRANSLUCENT);
    Graphics2D g2d = backgroundLayer[LayerNumber].createGraphics();
    g2d.setComposite(AlphaComposite.Src);

    // Clear the image.
    g2d.setColor(new Color(0, 0, 0, 0));
    g2d.fillRect(
        0, 0, backgroundLayer[LayerNumber].getWidth(), backgroundLayer[LayerNumber].getHeight());
    g2d.setBackground(new Color(0, 0, 0, 0));

    g2d.setColor(new Color(1f, 1f, 1f, 1f));
    for (int i = 0;
        i
            < backgroundLayer[LayerNumber].getWidth(this)
                / backgroundImage[LayerNumber].getWidth(this);
        i++) {
      g2d.drawImage(
          backgroundImage[LayerNumber], i * backgroundImage[LayerNumber].getWidth(this), 0, this);
    }
    return backgroundLayer[LayerNumber];
  }
  // Draw elements:
  @Override
  public void paint(Graphics g) {

    // Set up Graphics Enigne:
    Graphics2D g2d = (Graphics2D) g;

    // Antialiasing:
    if (antialiasing == true) {
      RenderingHints rh =
          new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
      rh.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);

      g2d.setRenderingHints(rh);
    }

    // Draw rendered image
    g2d.drawImage(
        renderImage, 0, 0, width, height, 0, 0, resolution.width, resolution.height, this);

    g2d.setColor(Color.yellow);

    g2d.drawString("FPS: " + fps, 20, 20);
  }
  public VolatileImage renderTileLayer() {
    // create hardware accellerated tile layer (Volatile Image)
    tileLayer =
        this.getGraphicsConfiguration()
            .createCompatibleVolatileImage(
                loadedLevel.getWidth() * 16,
                loadedLevel.getHeight() * 16,
                Transparency.TRANSLUCENT);
    Graphics2D g2d = tileLayer.createGraphics();
    g2d.setComposite(AlphaComposite.Src);

    // Clear the image.
    g2d.setColor(new Color(0, 0, 0, 0));
    g2d.fillRect(0, 0, tileLayer.getWidth(), tileLayer.getHeight());
    g2d.setBackground(new Color(0, 0, 0, 0));

    g2d.setColor(new Color(1f, 1f, 1f, 1f));

    for (int i = 0; i < numberOfTiles; i++) {
      tile[i].draw(g2d, this);
    }

    return tileLayer;
  }
  public VolatileImage render() {

    Graphics2D g2d = renderImage.createGraphics();

    try {

      // Draw background layer:
      for (int i = 0; i < backgroundLayer.length; i++) {
        g2d.drawImage(
            backgroundLayer[i],
            -(int) (camera.position.x * Math.pow(0.5, backgroundLayer.length - i)),
            -(int) (camera.position.y * Math.pow(0.5, backgroundLayer.length - i))
                + backgroundLayer[i].getHeight(this)
                - backgroundLayer[i].getHeight(this) / (i + 1),
            this);
      }

    } catch (Exception e) {
    }

    // Draw Tiles: (new)
    try {
      g2d.drawImage(
          tileLayer,
          camera.center.x - camera.position.x,
          camera.center.y - camera.position.y,
          this);
    } catch (Exception e) {
    }

    // Draw all kinds of Sprites:

    try {
      int a = 0;

      while (sprite[a] != null) {
        // Play Animation for sprite:
        if (sprite[a].animation.plays == true) {
          sprite[a].getAnimation().nextFrame();
        }

        // -- Draw sprite:
        g2d.drawImage(
            sprite[a].img,
            /*X1*/ sprite[a].posx
                + ((sprite[a].flipH - 1) / (-2)) * sprite[a].size.width /*camera*/
                - camera.position.x
                + camera.center.x, /*Y1*/
            sprite[a].posy
                + ((sprite[a].flipV - 1) / (-2)) * sprite[a].size.height /*camera*/
                - camera.position.y
                + camera.center.y,
            /*X2*/ sprite[a].posx
                + sprite[a].size.width * sprite[a].flipH
                + ((sprite[a].flipH - 1) / (-2)) * sprite[a].size.width /*camera*/
                - camera.position.x
                + camera.center.x, /*Y2*/
            sprite[a].posy
                + sprite[a].size.height * sprite[a].flipV
                + ((sprite[a].flipV - 1) / (-2)) * sprite[a].size.height /*camera*/
                - camera.position.y
                + camera.center.y, // destination
            sprite[a].getAnimation().col * sprite[a].size.width,
            sprite[a].getAnimation().row * sprite[a].size.height, // source
            (sprite[a].getAnimation().col + 1) * sprite[a].size.width,
            (sprite[a].getAnimation().row + 1) * sprite[a].size.height,
            this);

        a++;
      }
    } catch (Exception e) {
      g2d.drawString("Error drawing a Sprite", 20, 20);
    }

    // Draw "GUI":
    g2d.drawImage(coinSpriteSheet, 16, 16, 32, 32, 0, 0, 16, 16, this);
    g2d.setColor(Color.BLACK);
    g2d.drawString("x " + collectedCoins, 32, 30);
    g2d.setColor(Color.WHITE);
    g2d.drawString("x " + collectedCoins, 32, 29);

    if (showSpritePos == true) {
      for (int i = 0; i < numberOfSprites; i++) {
        g2d.setColor(Color.red);
        g2d.drawRect(
            /*X1*/ sprite[i].posx /*camera*/ - camera.position.x + camera.center.x, /*Y1*/
            sprite[i].posy /*camera*/ - camera.position.y + camera.center.y,
            1,
            1);
        g2d.setColor(Color.black);
      }
    }

    if (showSpriteNum == true) {
      for (int i = 0; i < numberOfSprites; i++) {
        g2d.setColor(Color.black);
        g2d.drawString(
            "" + i, /*X1*/
            sprite[i].posx /*camera*/ - camera.position.x + camera.center.x, /*Y1*/
            sprite[i].posy /*camera*/ - camera.position.y + camera.center.y);
        g2d.setColor(Color.white);
        g2d.drawString(
            "" + i, /*X1*/
            sprite[i].posx /*camera*/ - camera.position.x + camera.center.x, /*Y1*/
            sprite[i].posy /*camera*/ - camera.position.y + camera.center.y - 1);
      }
    }

    if (showSpritePos == true) {
      for (int i = 0; i < numberOfTiles; i++) {
        g2d.setColor(Color.red);
        g2d.drawRect(
            /*X1*/ tile[i].posx
                + ((tile[i].flipH - 1) / (-2)) * tile[i].size.width /*camera*/
                - camera.position.x
                + camera.center.x, /*Y1*/
            tile[i].posy
                + ((tile[i].flipV - 1) / (-2)) * tile[i].size.height /*camera*/
                - camera.position.y
                + camera.center.y,
            1,
            1);
        g2d.setColor(Color.black);
      }
    }

    if (showCamera == true) {
      g2d.setColor(Color.red);
      g2d.drawLine(
          0,
          camera.prefHeight - camera.position.y + camera.center.y,
          loadedLevel.getWidth() * 16,
          camera.prefHeight - camera.position.y + camera.center.y);
      g2d.setColor(new Color(1, 0, 0, 0.33f));
      g2d.fillRect(
          0,
          camera.prefHeight - camera.position.y + camera.tolerance,
          loadedLevel.getWidth() * 16,
          camera.tolerance);
      g2d.setColor(new Color(0, 1, 0, 0.33f));
      g2d.fillRect(
          camera.center.x - camera.position.x + camera.center.x,
          camera.center.y - camera.position.y + camera.center.y,
          camera.bounds.width - 2 * camera.center.x,
          camera.bounds.height);
      g2d.setColor(Color.green);
      g2d.drawLine(
          camera.center.x - camera.position.x + camera.center.x,
          0,
          camera.center.x - camera.position.x + camera.center.x,
          999);
      g2d.drawLine(
          camera.bounds.width - camera.center.x - camera.position.x + camera.center.x,
          0,
          camera.bounds.width - camera.center.x - camera.position.x + camera.center.x,
          999);
    }

    return renderImage;
  }