我如何改變這個蛇遊戲的背景顏色？

Question

你好，我最近剛剛在看關於如何在java中創建一個蛇遊戲的教程。 這是它，如果你想去看看http://www.youtube.com/watch?v=07UdiMlvDcI這是第4部分，他有更多的部分。

我複製了他的教程，但我想添加一些我自己的東西。我只是想知道是否有人知道如何將背景改爲黑色。我是一個java的大白菜，需要很多幫助。還有其他一些我想知道如何去做的例子。如何將Highscore或Score文本更改爲BOLD或將其放置在不同的位置。也不會介意知道如何改變頭部的顏色或用我下載的圖像替換頭部。另一件事是我如何改變窗口的大小，當我改變尺寸它不會改變任何東西。底部的第二堂課對你們來說可能更有用，因爲那些教程小夥子製作小程序的地方。任何幫助將不勝感激。

CODE：

public class SnakeCanvas extends Canvas implements Runnable, KeyListener{ 
    private final int BOX_HEIGHT = 10; 
    private final int BOX_WIDTH = 10; 
    private final int GRID_WIDTH = 25; 
    private final int GRID_HEIGHT = 25; 

    private LinkedList<Point> snake; 
    private Point fruit; 
    private int direction = Direction.NO_DIRECTION; 

    private Thread runThread; 
    private int score = 0; 
    private String highscore = ""; 

    public void init() { 

    } 

    public void paint(Graphics g) { 
     if (snake == null) { 
      snake = new LinkedList<Point>(); 
      GenerateDefaultSnake(); 
      PlaceFruit(); 
     } 

    if (runThread == null) { 
     this.setPreferredSize(new Dimension(640, 480)); 
     this.addKeyListener(this); 
     runThread = new Thread(this); 
     runThread.start(); 
    } 

    if (highscore.equals("")) { 
     highscore = this.GetHighScore(); 
    } 

    drawFruit(g); 
    drawGrid(g); 
    drawSnake(g); 
    drawScore(g); 

} 

public void update(Graphics g) { 
    Graphics offScreenGraphics; //Graphics used to draw offscreen 
    BufferedImage offscreen = null; 
    Dimension d = this.getSize(); 

    offscreen = new BufferedImage(d.width, d.height, BufferedImage.TYPE_INT_ARGB); 
    offScreenGraphics = offscreen.getGraphics(); 
    offScreenGraphics.setColor(this.getBackground());//CHANGE BACKGROUND COLOR 
    offScreenGraphics.fillRect(0, 0, d.width, d.height); 
    offScreenGraphics.setColor(this.getForeground()); 
    paint(offScreenGraphics); 

    //flip 
    g.drawImage(offscreen, 0, 0, this); 
} 

public void GenerateDefaultSnake() { 
    score = 0; 
    snake.clear(); 

    snake.add(new Point(0,2)); 
    snake.add(new Point(0,1)); 
    snake.add(new Point(0,0)); 
    direction = Direction.NO_DIRECTION; 

} 


public void Move() { 
    Point head = snake.peekFirst(); 
    Point newPoint = head; 
    switch(direction) { 
     case Direction.NORTH: 
      newPoint = new Point(head.x, head.y - 1); 
      break; 
     case Direction.SOUTH: 
      newPoint = new Point (head.x, head.y + 1); 
      break; 
     case Direction.WEST: 
      newPoint = new Point (head.x - 1, head.y); 
      break; 
     case Direction.EAST: 
      newPoint = new Point (head.x + 1, head.y); 
      break; 
    } 

snake.remove(snake.peekLast()); 

if(newPoint.equals(fruit)){ 
    score+=10; 
    //the snake has hit fruit 
    Point addPoint = (Point) newPoint.clone(); 

    switch(direction){ 
    case Direction.NORTH: 
    newPoint = new Point(head.x, head.y-1); 
    break; 
    case Direction.SOUTH: 
    newPoint = new Point (head.x, head.y+1); 
    break; 
    case Direction.WEST: 
    newPoint = new Point (head.x-1, head.y); 
    break; 
    case Direction.EAST: 
    newPoint = new Point (head.x+1, head.y); 
    break; 
} 
    snake.push(addPoint); 
    PlaceFruit(); 
} 
else if(newPoint.x < 0 || newPoint.x > GRID_WIDTH - 1){ 
    //we went out of bounce, reset game 
CheckScore(); 
GenerateDefaultSnake(); 
return; 
} 
else if(newPoint.y < 0 || newPoint.y > GRID_HEIGHT - 1){ 
    //we went out of bounce, reset game 
    CheckScore(); 
    GenerateDefaultSnake(); 
    return; 
} 
else if(snake.contains(newPoint)){ 
    //we ran into ourselves, reset game 
    CheckScore(); 
    GenerateDefaultSnake(); 
    return; 
} 

//if we reach this point in code, we're still alive 
snake.push(newPoint); 
} 

public void drawScore(Graphics g){ 
g.drawString("Score: " + score, 0, BOX_HEIGHT * GRID_HEIGHT + 10); 
g.drawString("HighScore: " + highscore, 0, BOX_HEIGHT * GRID_HEIGHT + 20); 
} 

public void CheckScore(){ 
if(highscore.equals("")) 
    return; 

    if(score > Integer.parseInt((highscore.split(":")[1]))){ 
    String name = JOptionPane.showInputDialog("NEW HIGHSCORE! PLEASE ENTER YOUR NAME."); 
    highscore = name + ":" + score; 

    File scoreFile = new File("highscore.dat"); 
    if(!scoreFile.exists()){ 
    try{ 
    scoreFile.createNewFile(); 
    } 
    catch(Exception e){ 
    e.printStackTrace(); 
    } 
    } 
    FileWriter writeFile = null; 
    BufferedWriter writer = null; 
    try{ 
    writeFile = new FileWriter(scoreFile); 
    writer = new BufferedWriter(writeFile); 
    writer.write(this.highscore); 
    } 
    catch(Exception e){ 
    } 
    finally{ 
    try{ 
    if(writer !=null) 
     writer.close(); 
    } 
    catch(Exception e){} 
    } 
    } 
    } 



    public void drawGrid(Graphics g){ 
    //drawing an outside rectangle 
    g.drawRect(0, 0, GRID_WIDTH * BOX_WIDTH, GRID_HEIGHT * BOX_HEIGHT); 

    } 

public void drawSnake(Graphics g){ 
g.setColor(Color.GREEN); 
for (Point p: snake){ 
    g.fillRect(p.x * BOX_WIDTH, p.y * BOX_HEIGHT, BOX_WIDTH, BOX_HEIGHT); 
} 
g.setColor(Color.BLACK); 
} 

public void drawFruit(Graphics g){ 
g.setColor(Color.RED); 
g.fillOval(fruit.x * BOX_WIDTH, fruit.y * BOX_HEIGHT, BOX_WIDTH, BOX_HEIGHT); 
g.setColor(Color.BLACK); 
    } 


public void PlaceFruit(){ 
Random rand = new Random(); 
int randomX = rand.nextInt(GRID_WIDTH); 
int randomY = rand.nextInt(GRID_HEIGHT); 
Point randomPoint = new Point(randomX, randomY); 
while(snake.contains(randomPoint)){ 
    randomX = rand.nextInt(GRID_WIDTH); 
    randomY = rand.nextInt(GRID_HEIGHT); 
    randomPoint = new Point (randomX, randomY); 
} 
fruit = randomPoint; 
} 

@Override 
public void run(){ 
while(true){//runs indefinitely 
    Move(); 
    repaint(); 

    try{ 
    Thread.currentThread(); 
    Thread.sleep(100); 
    } 
    catch(Exception e){ 
    e.printStackTrace(); 
    } 
} 

} 

public String GetHighScore(){ 

FileReader readFile = null; 
BufferedReader reader = null; 

try{ 
readFile = new FileReader("highscore.dat"); 
reader = new BufferedReader(readFile); 
return reader.readLine(); 
} 
catch(Exception e){ 
    return "Nobody:0"; 
} 

finally{ 
    try{ 
    if(reader != null) 
    reader.close(); 
    } 
    catch(Exception e){ 
    e.printStackTrace(); 
    } 
} 

} 

@Override 
public void keyTyped(KeyEvent e){ 
//TODO Auto-generated method stub 

} 

@Override 
public void keyPressed(KeyEvent e) { 
switch (e.getKeyCode()) 
{ 
case KeyEvent.VK_UP: 
if (direction != Direction.SOUTH) 
direction = Direction.NORTH; 
break; 
case KeyEvent.VK_DOWN: 
if (direction != Direction.NORTH) 
direction = Direction.SOUTH; 
break; 
case KeyEvent.VK_RIGHT: 
if (direction != Direction.WEST) 
direction = Direction.EAST; 
break; 
case KeyEvent.VK_LEFT: 
if (direction != Direction.EAST) 
direction = Direction.WEST; 
break; 

} 
} 

@Override 
public void keyReleased(KeyEvent e){ 

} 



} 

另一個類：

public class snakeApplet extends Applet{ 

private SnakeCanvas c; 

public void init(){ 
c = new SnakeCanvas(); 
c.setPreferredSize(new Dimension(640, 480)); 
c.setVisible(true); 
c.setFocusable(true); 
this.add(c); 
this.setVisible(true); 
this.setSize(new Dimension(640, 480)); 

} 

public void paint(Graphics g){ 
this.setSize(new Dimension(640, 480)); 
} 
} 

IM真的希望有人能幫助我！

Answer 1

嘗試添加this.setBackground（Color.BLACK）;到SnakeCanvas類中的paint方法。如果這不起作用，請將相同的行添加到snakeApplet類中。如果這不起作用，我很抱歉我失敗了。