飛機小專案

package cn.sxt.game;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Date;

import javax.swing.JFrame;

public class MyGameFrame extends JFrame{

	private static final int BOLD = 0;
	Image planeImg=GameUtil.getImage("images/plane.png");
	Image bg=GameUtil.getImage("images/bg.jpg");

	Plane plane=new Plane(planeImg,250,250);
	Shell[] shells=new Shell[50];
	Explode bao;
	Date startTime=new Date();
	Date endTime;
	int period;//遊戲持續的時間

	public void paint(Graphics g){//自動被呼叫，g是畫筆
		Color c=g.getColor();
		g.drawImage(bg,0,0,null);
		plane.drawSelf(g);

		for(int i=0;i<shells.length;i++){
			shells[i].draw(g);

			//飛機和炮彈的碰撞檢測
			boolean peng = shells[i].getRect().intersects(plane.getRect());
			if(peng){
				plane.live=false;
				if(bao==null){
					bao=new Explode(plane.x,plane.y);
				}
				bao.draw(g);
				
				endTime=new Date();
				period =(int)((endTime.getTime()-startTime.getTime())/1000);
			}
			//計時功能，提示時間
			if(!plane.live){
				
				g.setColor(Color.RED);
				Font f=new Font("宋體",BOLD,50);
				g.setFont(f);
				g.drawString("時間："+period+"秒",(int)plane.x,(int)plane.y);
			}
			
		}
		g.setColor(c);
	}

	class PaintThread extends Thread{
		public void run() {
			while(true){
				repaint();//重畫
				try {
					Thread.sleep(40);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
		}
	}

	//定義鍵盤監聽內部類
	class KeyMonitor extends KeyAdapter{

		@Override
		public void keyPressed(KeyEvent e) {
			plane.addDiection(e);
		}

		@Override
		public void keyReleased(KeyEvent e) {
			plane.minusDiection(e);
		}

	}


	//初始化視窗
	public void launchFrame(){
		this.setTitle("程式猿");
		this.setVisible(true);
		this.setSize(Constant.GAME_WIDTH, Constant.GAME_HEIGHT);
		this.setLocation(300, 300);

		this.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e){
				System.exit(0);
			}
		});

		new PaintThread().start();//啟動重畫視窗的執行緒
		addKeyListener(new KeyMonitor());//給視窗增加鍵盤的監聽

		//初始化50個炮彈
		for(int i=0;i<shells.length;i++){
			shells[i]=new Shell();
		}
	}

	public static void main(String[] args){
		MyGameFrame f=new MyGameFrame();
		f.launchFrame();
	}

	private Image offfScreenImage=null;

	public void update(Graphics g){
		if(offfScreenImage==null)
			offfScreenImage=this.createImage(Constant.GAME_WIDTH,Constant.GAME_HEIGHT);

		Graphics gOff=offfScreenImage.getGraphics();
		paint(gOff);
		g.drawImage(offfScreenImage, 0, 0, null);
	}

}

package cn.sxt.game;

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
 
public class GameUtil {
    // 工具類最好將構造器私有化。
    private GameUtil() {
     
    } 
 
    public static Image getImage(String path) {
        BufferedImage bi = null;
        try {
            URL u = GameUtil.class.getClassLoader().getResource(path);
            bi = ImageIO.read(u);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return bi;
    }
}

package cn.sxt.game;

import java.awt.Graphics;
import java.awt.Image;
import java.awt.Rectangle;

//遊戲物體的父類
public class GameObject {
	 Image img;
	 double x,y;
	 int speed;
	 int width,height;
	
	public void drawSelf(Graphics g){
		g.drawImage(img, (int)x, (int)y, null);
	}

	public GameObject(Image img, double x, double y, int speed, int width, int height) {
		super();
		this.img = img;
		this.x = x;
		this.y = y;
		this.speed = speed;
		this.width = width;
		this.height = height;
	}

	public GameObject(Image img, double x, double y) {
		super();
		this.img = img;
		this.x = x;
		this.y = y;
	}
	
	public GameObject(){
		
	}
	
	//返回物體所在的矩形，便於後續的碰撞檢測
	public Rectangle getRect(){
		return new Rectangle((int)x,(int)y,width,height);
	}
	
}

package cn.sxt.game;

import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyEvent;

public class Plane extends GameObject{

	boolean left,up,right,down;
	boolean live=true;

	public void drawSelf(Graphics g){
		
		if(live){
			g.drawImage(img, (int)x, (int)y, null);
			
			if(left){
				x-=speed;
			}
			if(right){
				x+=speed;
			}
			if(up){
				y-=speed;
			}
			if(down){
				y+=speed;
			}
		}
		
	}

	public Plane(Image img,double x,double y){
		this.img=img;
		this.x=x;
		this.y=y;
		this.speed=3;
		this.width=img.getWidth(null);
		this.height=img.getHeight(null);
	}

	//按下某個鍵，增加相應的方向
	public void addDiection(KeyEvent e){
		switch(e.getKeyCode()){
		case KeyEvent.VK_LEFT:
			left=true;
			break;
		case  KeyEvent.VK_UP:
			up=true;
			break;
		case  KeyEvent.VK_RIGHT:
			right=true;
			break;
		case  KeyEvent.VK_DOWN:
			down=true;
			break;
		}
	}
	
	//按下某個鍵，取消相應的方向
	public void minusDiection(KeyEvent e){
		switch(e.getKeyCode()){
		case KeyEvent.VK_LEFT:
			left=false;
			break;
		case  KeyEvent.VK_UP:
			up=false;
			break;
		case  KeyEvent.VK_RIGHT:
			right=false;
			break;
		case  KeyEvent.VK_DOWN:
			down=false;
			break;
		}
	}

}

package cn.sxt.game;

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

//炮彈類
public class Shell extends GameObject{
	
	double degree;
	
	public Shell(){
        degree = Math.random()*Math.PI*2;
        x = 200;
        y = 200;
        width = 10;
        height = 10;
        speed = 2;
    }
     
    public void draw(Graphics g){
        //將外部傳入物件g的狀態儲存好
        Color c = g.getColor();
        g.setColor(Color.yellow);
 
        g.fillOval((int)x, (int)y, width, height);
         
        //炮彈沿著任意角度飛行
        x += speed*Math.cos(degree);
        y += speed*Math.sin(degree);
		
		if(y>Constant.GAME_HEIGHT-height-10||y<50){
            degree = -degree;
        }
        if(x<10||x>Constant.GAME_WIDTH-width-10){
            degree = Math.PI-degree;
        }	
		
		g.setColor(c);
	}

}

package cn.sxt.game;

public class Constant {
	public static final int GAME_WIDTH=500;
	public static final int GAME_HEIGHT=500;

}

package cn.sxt.game;

import java.awt.Graphics;
import java.awt.Image;

public class Explode {
	double x,y;
	
	static Image[] imgs=new Image[16];//static 圖片只載入一次
	static{
		for(int i=0;i<16;i++){
			imgs[i]=GameUtil.getImage("images/e"+(i+1+".gif"));
			imgs[i].getWidth(null);
		}
	}

	int count;
	
	public void draw(Graphics g){
		if(count<16){
			g.drawImage(imgs[count],(int)x,(int)y,null);
			count++;
		}
	}
	public Explode(double x,double y){
		this.x=x;
		this.y=y;
	}
}