飞扬的小鸟

Bird类

public class Bird {
    BufferedImage image;
    int x,y,width,height;
    //鸟的大小,检测碰撞
    int size;
    //用于计算鸟的位置
    double g;//重力加速度
    double t;//两次位置的时间间隔,即运动时间
    double v0;//初始上抛速度
    double speed;//当前的上抛速度
    double s;//经过时间t后是位移
    double alpha;//鸟的倾角,单位是弧度
    //定义一组图片,是鸟的动画帧
    BufferedImage[] images;
    //动画帧数数组元素的下标位置
    int index;

    public Bird() throws Exception {
        image = ImageIO.read(new File("img/0.png"));
        width = image.getWidth();
        height = image.getHeight();
        x=132;
        y=280;
        size = 40;

        g=4;
        v0=20;
        t=0.25;
        speed=v0;
        s=0;
        alpha=0;

        //创建数组,创建8个元素的数组
        images = new BufferedImage[8];
        for (int i = 0; i < images.length; i++) {
            images[i] = ImageIO.read(new File("img/"+i+".png"));
        }
        index = 0;
    }

    //鸟飞翔的方法
    public void fly(){
        index++;
        image = images[(index/12)%8];//之所以除以12是为了使鸟的运行速度减慢,即切换图片
    }

    public void flappy(){
        //重新设置初始速度,重新向上飞
        speed = v0;
    }
    //碰撞的方法
    public boolean hit(Ground ground){
        boolean hit = y + size / 2 > ground.y;
        if(hit){
            //将鸟放置到地面上
            y = ground.y-size/2;
            //使鸟落地时有摔倒效果
            alpha = -3.14159265358979323/2;
        }
        return hit;
    }
    //检测当前的鸟是否撞到了柱子
    public boolean hit(Column column){
        //先检测鸟是否在柱子范围内
        if(x>column.x-column.width/2-size/2 && x<column.x+column.width/2+size/2){
            //检测是否在缝隙中
            if(y>column.y-column.gap/2+size/2 && y<column.y+column.gap/2-size/2){
                return false;
            }
            return true;
        }
        return false;

    }

    //鸟移动的方法
    public void step(){
        double v0 = speed;
        s=v0 * t + g * t * t / 2;//计算上抛运动的位移
        y =  y - (int) s;//计算鸟坐标位置
        double v = v0 - g * t;
        speed = v;

        //调用API提供反正切函数,计算倾角
        alpha=Math.atan(s/8);
    }
}

BirdGame类

public class BirdGame extends JPanel{
    Bird bird;
    Column column1;Column column2;
    Ground ground;
    BufferedImage background;
    //boolean gameOver;
    BufferedImage gameOverImage;
    BufferedImage startImage;
    //游戏状态
    int state;
    public static final int START = 0;
    public static final int RUNNING =1;
    public static final int GAME_OVER=2;
    //分数
    int score;
    public BirdGame() throws Exception{
        //gameOver = false;
        startImage = ImageIO.read(new File("img/start.png"));
        gameOverImage = ImageIO.read(new File("img/gameover.png"));
        //初始化属性
        bird  = new Bird();
        column1 = new Column(1);
        column2 = new Column(2);
        ground = new Ground();
        background = ImageIO.read(new File("img/bg.png"));
    }
    //重写paint方法,实现绘制
    public void paint(Graphics g) {
        g.drawImage(background,0,0,null);//名字,x坐标,y坐标
        g.drawImage(column1.image,column1.x-column1.width/2,column1.y-column1.height/2,null);
        g.drawImage(column2.image,column2.x-column2.width/2,column2.y-column1.height/2,null);
        g.drawImage(ground.image,ground.x,ground.y,null);
        //旋转绘制坐标系;API提供方法
        Graphics2D g2= (Graphics2D)g;
        g2.rotate(-bird.alpha,bird.x,bird.y);
        g.drawImage(bird.image,bird.x-bird.width/2,bird.y-bird.height/2,null);
        g2.rotate(bird.alpha,bird.x,bird.y);
        //添加绘制分数的算法
        Font f = new Font(Font.SANS_SERIF,Font.BOLD,40);
        g.setFont(f);
        g.drawString(""+score, 40, 60);
        g.setColor(Color.PINK);
        g.drawString(""+score, 40-3, 60-3);
        //if(gameOver){
        //	g.drawImage(gameOverImage,0,0,null);
        //}
        //添加显示游戏结束状态的代码
        switch(state){
            case GAME_OVER:
                g.drawImage(gameOverImage,0,0,null);
            case START:
                g.drawImage(startImage,0,0,null);
                break;
        }
    }
    //
    public void action() throws Exception{
        MouseListener l = new MouseListener() {

            @Override
            public void mouseReleased(MouseEvent e) {
                // TODO Auto-generated method stub

            }

            @Override
            //鼠标按下的方法
            public void mousePressed(MouseEvent e) {
                try {
                    switch(state){
                        case GAME_OVER:
                            column1= new Column(1);
                            column2=new Column(2);
                            bird = new Bird();
                            score =0;
                            state =START;
                            break;
                        case START:
                            state = RUNNING;
                        case RUNNING:
                            bird.flappy();
                    }
                } catch (Exception e2) {
                    // TODO: handle exception
                }
                //鸟向上飞
                //bird.flappy();
            }

            @Override
            public void mouseExited(MouseEvent e) {
                // TODO Auto-generated method stub

            }

            @Override
            public void mouseEntered(MouseEvent e) {
                // TODO Auto-generated method stub

            }

            @Override
            public void mouseClicked(MouseEvent e) {
                // TODO Auto-generated method stub

            }
        };
        //将l挂接到当前的面板(game)上
        addMouseListener(l);
        while(true){
            if(true){
				/*ground.step();
				column1.step();
				column2.step();
				bird.step();
				bird.fly();
			}
			if(bird.hit(ground) || bird.hit(column1) || bird.hit(column2)){
				//gameOver = true;
			}

			//积分逻辑
			if(bird.x==column1.x || bird.x==column2.x){
				score++;
			}*/
                switch(state){
                    case START:
                        bird.fly();
                        ground.step();
                        break;
                    case RUNNING:
                        column1.step();
                        column2.step();
                        bird.step();//上下移动
                        bird.fly();//翅膀挥动
                        ground.step();
                        //积分逻辑
                        if(bird.x==column1.x || bird.x==column2.x){
                            score++;
                        }
                        //如果鸟撞到地面,游戏结束
                        if(bird.hit(ground) || bird.hit(column1) || bird.hit(column2)){
                            state = GAME_OVER;

                        }
                        break;
                }
                repaint();//重新绘制界面
                Thread.sleep(1000/30);//设置屏幕的刷新频率,1秒刷新30次
            }}
    }
    public static void main(String[] args) throws Exception {
        JFrame frame = new JFrame();
        BirdGame game = new BirdGame();
        frame.add(game);
        frame.setSize(440, 670);//设置窗口大小
        frame.setLocationRelativeTo(null);//让窗口居中
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//关联关闭按钮
        frame.setVisible(true);//设置窗口可见
        game.action();


    }
}

Column类

//柱子
public class Column {
    BufferedImage image;
    int x,y,width,height;
    //柱子的缝隙
    int gap;
    //两个柱子之间就距离
    int distance;
    Random random = new Random();
    //初始化数据,n代表第几根柱子
    public Column(int n) throws Exception{
        image = ImageIO.read(new File("img/column.png"));
        width = image.getWidth();
        height = image.getHeight();
        gap = 144;
        distance = 245;
        x = 550 + (n - 1)*distance;
        y = random.nextInt(218)+132;
    }
    //柱子移动的方法
    public void step(){
        x-=3;
        if(x == -width/2){
            x=distance*2-width/2;
            y = random.nextInt(218)+132;
        }
    }


}

Ground类

public class Ground{
    BufferedImage image;
    int x,y,width,height;
    public Ground() throws Exception{
        image = ImageIO.read(new File("img/ground.png"));
        width = image.getWidth();
        height = image.getHeight();
        x=0;
        y=500;
    }
    //地面移动的方法
    public void step(){
        x--;
        if(x==-109){
            x=0;
        }
    }
}