基于JAVA的简易坦克大战（七）

4.2.3 炮弹类算法

1、炮弹类实现了炮弹的draw方法和子弹的move方法。

2、Draw方法是通过调用JAVA封装的内部方法来实现的。Move方法是根据坦克炮筒的方向和子弹的速度来改变子弹的坐标。再通过坦克大战管理类的线程重画来实现子弹的动态移动效果的。

3、炮弹类设计源码：
import java.awt.*;
public class Shell {
    
	private static final int Speech = 10;//子弹速度
	private static final int width = 10;
	private static final int height = 10;//子弹图形区域宽高
	private int x;
	private int y;//子弹坐标
	private boolean good;//子弹敌我识别
	private boolean live = true;
	public boolean isLive() {
		return live;
	}
	public void setLive(boolean live) {
		this.live = live;
	}
	public boolean isGood() {
		return good;
	}
	public void setGood(boolean good) {
		this.good = good;
	}
	private TankClient tc = null;
	Tank.Direction sDir = null;
	public static void main(String[] args) {
		// TODO Auto-generated method stub

	}
	public Shell(int x,int y,boolean good,Tank.Direction sDir,TankClient tc){
		this.x = x;
		this.y = y;
		this.good = good;
		this.sDir = sDir;
		this.tc = tc;
	}
	public void drawShell(Graphics g){
		Color c = g.getColor();
		g.setColor(Color.WHITE);
		g.fillOval(x, y, width, height);
		g.setColor(c);
		
		move();
	}
	//有方向弹药就会移动
	public void move(){
		switch(sDir){
		case L:x -= Speech;break; 
		case LU:x -= Speech;y -= Speech;break; 
		case LD:x -= Speech;y += Speech;break; 
		case R:x += Speech;break; 
		case RU:x += Speech;y -= Speech;break; 
		case RD:x += Speech;y += Speech;break; 
		case U:y -= Speech;break; 
		case D:y += Speech;break; 
		case STOP:
		}
		if(x < 0 || y < 0 || x > 800 || y >600 || !isLive())
		{
			tc.shells.remove(this);
			setLive(false);
		}
	}
	//获取子弹所占区域
    public Rectangle getRect(){
    	return new Rectangle(x,y,width,height);
    }
}

4.2.4 胶囊类算法

1、胶囊类实现了胶囊的draw方法和move方法以及和我方坦克的碰撞检测方法。

2、Draw方法是通过调用JAVA内部封装的方法来实现的。

3、Move方法是通过随机数的方式来判定移动方向的，再根据方向来改变胶囊的坐标，通过坦克大战管理类的线程重画来实现不规则移动效果的。

4、胶囊类型的随机是在坦克大战管理类的paint方法中实现的，每次重画就会在一定范围内随机数，通过随机数来改变胶囊的类型。

5、我方坦克所占的方框范围与胶囊的所占的方框范围重合时，判断我方坦克“吃”掉了胶囊，胶囊属性live = false，此时在线程重画时就不再将胶囊画出，直到再次创建出新的胶囊。

//胶囊类的设计源码：
import java.awt.*;
import java.util.Random;

public class Blood {
	private static final int Speech = 15;
	private int x = 400;
	private int y = 300;
	private int number;//胶囊类型
	private int oldX;
	private int oldY;
	private boolean live = true;
	private int width = 20;
	private int height = 20;
	private TankClient tc = null;
	enum Direction{L,LU,LD,R,RU,RD,U,D,STOP}
	Direction dir = Direction.R;
	public static void main(String[] args) {
		// TODO Auto-generated method stub
	}
	public boolean isLive() {
		return live;
	}
	public void setLive(boolean live) {
		this.live = live;
	}
	public Blood(int number,TankClient tc) {
		super();
		this.number = number;
		this.tc = tc;
	}

	public void drawBlood(Graphics g){
		Color c = g.getColor();
		if(isLive() && number == 0)//0号胶囊为回血胶囊
		{	
			g.setColor(Color.RED);
			g.draw3DRect(x, y, width, height,true);
			g.drawString("回血", x + width/2, y + height/2);
		}
		else if(isLive() && number == 1)//1号胶囊为减血胶囊
		{
			g.setColor(Color.ORANGE);
			g.draw3DRect(x, y, width, height,true);
			g.drawString("未知", x + width/2, y + height/2);
		}
		g.setColor(c);
		move();
	}
	public void move(){
		Random rn = new Random();
		int bDir = rn.nextInt(9);
		oldX = x;
		oldY = y;
		switch(bDir){
		case 0:x -= Speech;break; //L
		case 1:x -= Speech;y -= Speech;break;//LU 
		case 2:x -= Speech;y += Speech;break; //LD
		case 3:x += Speech;break; //R
		case 4:x += Speech;y -= Speech;break;//RU 
		case 5:x += Speech;y += Speech;break; //RD
		case 6:y -= Speech;break; //U
		case 7:y += Speech;break; //D
		case 8:stay();break;
		}
		if(x < 0 || y < 30 || x > 770 || y > 570)
			stay();
		//碰撞检测
		hitCheck();
	}
	public void stay(){
		x = oldX;
		y = oldY;
	}
	public Rectangle getRect(){
		return new Rectangle(x,y,width,height);
	}
	public void hitCheck(){
		if(getRect().intersects(tc.myTank.getRect()) && isLive() && number == 0)
		{
			tc.myTank.setLife(30);
			setLive(false);
		}
		else if(getRect().intersects(tc.myTank.getRect()) && isLive() && number == 1)
		{
			int tempLife = tc.myTank.getLife();
			tc.myTank.setLife(tempLife - 10);
			setLive(false);
			if(tc.myTank.getLife() == 0)
			{
				tc.myTank.setLive(false);
				tc.myTank.setScore(0);
				tc.myTank.setLevel(0);
			}
		}
	}
}