public class FishlordFrame extends JFrame {

	public static final int WIDTH = 800;
	public static final int HEIGHT = 480;
	
	private Pool pool;
	
	/**
	 * 構(gòu)造器中初始化界面
	 */
	public FishlordFrame() {
		
		this.setTitle("捕魚達人");
		this.setSize(WIDTH, HEIGHT);
		this.setLocationRelativeTo(null); // 設(shè)置窗口居中，必須放在setSize之后
		this.setResizable(false);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		try {
			pool = new Pool();
			this.getContentPane().add(pool);
			this.setVisible(true);
			pool.action();
		} catch (IOException e) {
			JOptionPane.showMessageDialog(this, "加載資源失??！","應(yīng)用程序錯誤",JOptionPane.ERROR_MESSAGE);
			e.printStackTrace();
		} catch (Exception e) {
			JOptionPane.showMessageDialog(this, "初始化游戲失敗！","應(yīng)用程序錯誤",JOptionPane.ERROR_MESSAGE);
			e.printStackTrace();
		}
		
	}
	
}

class Fish implements Runnable {
	
	private static final int BASE_STEP = 5;				// x和y坐標的步進值的參考標準
	int speedOfFish = 20;								// 控制魚的速度
	
	int x, y, index, width, height, xStep,yStep;

	BufferedImage fishImage;                          	// 當(dāng)前魚的背景圖
	BufferedImage[] fishImages = new BufferedImage[10];	// 一條魚的所有幀的圖片
	Random r;											// 產(chǎn)生隨機數(shù)

	/**
	 * 在構(gòu)造器中初始化魚的屬性
	 * @param fishname
	 * @throws IOException
	 */
	public Fish(String fishName) throws IOException {
		// 加載魚的圖片
		BufferedImage tempFishImage;
		String resourceName;
		for (int i = 0; i < 10; i++) {
			if (i!=9) {
				resourceName = "/images/" + fishName + "_0" + (i+1) + ".png";
			}else {
				resourceName = "/images/" + fishName + "_" + (i+1) + ".png";
			}
			tempFishImage = ImageIO.read(getClass().getResourceAsStream(resourceName));
			fishImages[i] = tempFishImage;
		}
		fishImage = fishImages[index];
		
		width = fishImage.getWidth();   					// 根據(jù)背景圖片的寬高設(shè)置魚所占矩形區(qū)域的大小
		height = fishImage.getHeight();
		
		goInPool();
	}

	/**
	 * 維持魚的游動---x和y坐標的變化
	 */
	public void run() {
		while (true) {
			try {
				Thread.sleep(speedOfFish); // 如果不休眠，魚的速度過快，基本感覺不到魚的存在。視覺暫留：1/24~1/7秒之間
				index++;
				fishImage = fishImages[index % fishImages.length]; // 輪流切換幀，生成動畫
				x = x - xStep;
				int temp = r.nextInt(10) + 1;
				yStep = r.nextBoolean()?temp:-temp;
//				y = y + yStep;
				
				// 判斷魚是否到了邊界，因為魚是從右面進入的，因此只需要判斷3個方向
				if (x <= 0 || y <= 0 || y >= 480){
					goInPool();
				}
				
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}

	/**
	 *  判斷魚是否在網(wǎng)內(nèi)
	 */
	public boolean fishInNet(int netX, int netY) {
		int dx = netX - x;
		int dy = netY - y;
		return dx >= 0 && dx <= width && dy >= 0 && dy <= height;
	}

	/**
	 * 魚從屏幕上游出或者被網(wǎng)罩住的時候消失，再從屏幕的右側(cè)游動到屏幕中,實際上還是那幾條魚
	 */
	void goInPool() {
		r = new Random();
		x = FishlordFrame.WIDTH - 10;						// 魚從右側(cè)游動到屏幕左側(cè)
		y = r.nextInt(FishlordFrame.HEIGHT - 20 - height);	// 魚的初始y的坐標是根據(jù)窗體的高度隨機指定的
		xStep = r.nextInt(BASE_STEP) + 1;					// 魚游動的速度是隨機的                        
	}
}

class Pool extends JPanel {
	
	BufferedImage background = null;	// 游戲界面的背景圖片
	Fish fish = null;    				// 魚
	Fish[] fishs = new Fish[11];		// 魚對象數(shù)組
	Net net = null;						// 漁網(wǎng)
	
	int score = 0;						// 分數(shù)
	Font font = new Font("楷體", Font.BOLD, 20);

	public Pool() throws IOException {
		
		/** getClass().getResourceAsStream()方法讀取的是src/images包下的資源文件【圖片】*/
		background = ImageIO.read(getClass().getResourceAsStream("/images/bg.jpg"));
		
		/* 產(chǎn)生11條魚，每1條魚都是1個線程 */
		for (int i = 0; i < 11; i++) {
			if (i < 9) {
				fish = new Fish("fish0" + (i + 1));
			} else {
				fish = new Fish("fish" + (i + 1));
			}
			
			fishs[i] = fish;
			new Thread(fish).start();
		}
	}

	@Override
	public void paint(Graphics g) {
		
		g.drawImage(background, 0, 0, null); 												// 繪制背景
		for (int i = 0; i < fishs.length; i++) {
			Fish tempfish = fishs[i];
			g.drawImage(tempfish.fishImage, tempfish.x, tempfish.y, null); 					// 繪制魚
		}
		if (net.show) {
			g.drawImage(net.netImage, net.x - net.width / 2, net.y - net.height / 2, null); // 判斷漁網(wǎng)是否顯示，繪制漁網(wǎng)
		}
		g.setFont(font);
		g.setColor(Color.YELLOW);
		g.drawString("SCORE:", 10, 20);
		g.setColor(Color.MAGENTA);
		g.drawString("      " + score, 10, 20);
	}

	/**
	 * 處理鼠標事件-實現(xiàn)點擊鼠標進行捕魚
	 * @throws Exception
	 */
	public void action() throws Exception {

		net = new Net();

		/**
		 * 實現(xiàn)鼠標適配器避免出現(xiàn)實現(xiàn)鼠標監(jiān)聽器接口或者使用匿名內(nèi)部類出現(xiàn)的代碼冗余
		 * 我們可以根據(jù)需要重寫自己需要的方法
		 */
		
		MouseAdapter adapter = new MouseAdapter() {
			
			/* 鼠標進入，漁網(wǎng)顯示；鼠標移出，漁網(wǎng)不顯示 */
			@Override
			public void mouseEntered(MouseEvent e) {
				net.show = true;
			}

			@Override
			public void mouseExited(MouseEvent e) {
				net.show = false;
			}

			/**
			 * 漁網(wǎng)的位置隨著鼠標的位置變化
			 */
			@Override
			public void mouseMoved(MouseEvent e) {
				
				net.x = e.getX();
				net.y = e.getY();
			}

			/**
			 * 當(dāng)鼠標按下的時候進行捕魚操作
			 */
			@Override
			public void mousePressed(MouseEvent e) {
				catchFish();
			}

		};
		
		this.addMouseListener(adapter); 		// 添加鼠標監(jiān)聽器
		this.addMouseMotionListener(adapter);	// 鼠標移動監(jiān)聽器

		while (true) {
			repaint(); 
			try {
				Thread.sleep(100); 				// 每隔一定時間刷新屏幕，需要符合視覺暫留設(shè)置50~100ms
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}

	/**
	 * 漁網(wǎng)是否捉到魚
	 */
	protected void catchFish() {
		// 魚在不在網(wǎng)的范圍內(nèi)？在的話就讓魚消失
		for (int i = 0; i < fishs.length; i++) {
			fish = fishs[i];
			if (fish.fishInNet(net.x, net.y)) {// 判斷在不在網(wǎng)的范圍
				fish.goInPool();				 // 魚從池子中消失，重新從右邊游入	
				score += fish.width / 10;		 // 不同的魚有不同的分數(shù)
			}
		}
	}

}