Question

我还在学习java编程，我还有很长的路要走。我试图编写我的第一个游戏，即蛇游戏，我遇到了一些我不太懂的问题。

这是我的代码：

渲染器类

Book::Author

蛇

public class Renderer {

private static Frame frame;
private static Canvas canvas;

private final static int WIDTH = 500;
private final static int HEIGHT = 500;
private final static int tileSize = 25;

private final static int width_game = 510;
private final static int height_game = 510;

private static int ticks = 0;

static Board board = new Board(0,0,tileSize);
static Snake snake;
static int AposX = (int)(Math.random() * 20);
static int AposY = (int)(Math.random() * 20);
static Apple apple = new Apple(AposX, AposY, tileSize);
public static int posX = 7;
public static int posY = 10;
public static int snakeSize = 3;

static Control control;
static int direction = 3;  //0 = up, 1 = right, 2 = down, 3 = left

public static boolean right = true, left = false, up = false, down = false;

public static ArrayList <Snake> snakeList = new ArrayList<Snake>();

public static void init(){
    frame = new Frame();
    canvas = new Canvas();

    //Add user control
    control = new Control(direction);
    canvas.addKeyListener(control);
    canvas.setFocusable(true);

    canvas.setSize(new Dimension(WIDTH, HEIGHT));

    frame.add(canvas);
    frame.pack();

    frame.setTitle("Snake Game");
    frame.setResizable(false);      
    frame.setLocationRelativeTo(null);

    frame.addWindowListener(new WindowAdapter(){
        public void windowClosing(WindowEvent e){
            Main.quit();
        }
    });

    frame.setVisible(true);

    startRendering();
}

public static void startRendering(){
    Thread thread = new Thread(){                   
        public void run(){          
            while(true){
                draw();
            }
        }
    };
    thread.start();
}

public static void draw(){
    GraphicsConfiguration gc = canvas.getGraphicsConfiguration();
    VolatileImage vImage = gc.createCompatibleVolatileImage(WIDTH, HEIGHT);

    while(true){
        ticks++;

        if(vImage.validate(gc) == VolatileImage.IMAGE_INCOMPATIBLE){
            vImage = gc.createCompatibleVolatileImage(WIDTH, HEIGHT);
        }

        Graphics g = vImage.getGraphics();

        //Clear Frame
        g.clearRect(0, 0, WIDTH, HEIGHT);

        //To create Snake in the start inside the array             
        int index = 0;
        while(snakeList.size() != snakeSize){
            snake = new Snake(posX, posY, tileSize);
            snakeList.add(snake);
        }

        //Frame to update the snake to move
        if(ticks > 100){
            direction = control.getDirection();

            if(direction == 1)posX++;
            if(direction == 3)posX--;
            if(direction == 2)posY++;
            if(direction == 0)posY--;

            snake = new Snake(posX, posY, tileSize);
            snakeList.add(snake);   

            if(snakeList.size() > snakeSize){
                snakeList.remove(0);
            }
            ticks = 0;

            //If the snake out of the area, it will go back to another side
            if(posX > 20){posX = -1;}
            if(posX < -1){posX = 20;}
            if(posY > 20){posY = -1;}
            if(posY < -1){posY = 20;}

            if(snakeList.get(0).getSnakePosX() == apple.getApplePosX() && snakeList.get(0).getSnakePosY() == apple.getApplePosY()){
                apple.update();
                snakeSize++;
            }
        }

        //Rendering the snake
        for(int x = 0; x < snakeList.size(); x++){
            snakeList.get(x).render(g);
        }

        //Rendering the apple
        apple.render(g);

        //Rendering the board grid
        board.render(g);

        g = canvas.getGraphics();
        g.drawImage(vImage, 0, 0, width_game, height_game, null);

        g.dispose();
    }
}
}

好的问题是，蛇会在尾巴的末端而不是头部与苹果接触。但是在代码中

import java.awt.Color;
import java.awt.Graphics;

public class Snake {
public int posX;
public int posY;
public int tileSize;
final static public int height = 500;
final static public int width = 500;
public int direction = 1; //0 = up, 1 = right, 2 = down, 3 = left

public Snake(int posX, int posY, int tileSize){
    this.posX = posX;
    this.posY = posY;
    this.tileSize = tileSize;
}

public void render(Graphics g){
    g.setColor(Color.blue);
    g.fillRect(posX*tileSize, posY*tileSize, tileSize, tileSize);
}

public void update(){

}

public int getSnakePosX(){return posX;}
public int getSnakePosY(){return posY;}
}

我清楚地定义了第一个索引，它是0，这是蛇体部分的第一个是头部。我在这里找不到问题。阵列的头部位于[2]。

我希望这真的有帮助，我很快就会得到解决方案，谢谢。

以下是我认为可能存在问题的领域：

if(snakeList.get(0).getSnakePosX() == apple.getApplePosX() && snakeList.get(0).getSnakePosY() == apple.getApplePosY()){
            apple.update();
            snakeSize++;
        }

上面的代码用于创建前3个身体部位。

            while(snakeList.size() != snakeSize){
            snake = new Snake(posX, posY, tileSize);
            snakeList.add(snake);
        }

这一个是这样的，如果发生碰撞，蛇的大小会增加。

如何在我的蛇游戏中使用Java ArrayList？

0 个答案: