bullets.java

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import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;
import java.util.*;



public class Bullets extends GameObject { 
	private int bullets[][];//子弹状态数组 
	private int bulletstotal;//数组的length 
	private Random rnd;//随机数 
	public static final int BULLET_TYPE_LEFT=0;//子弹初始化的位置类型:分为上下左右四种 
	public static final int BULLET_TYPE_RIGHT=1;//
	public static final int BULLET_TYPE_TOP=2; 
	public static final int BULLET_TYPE_BOTTOM=3; 
	private int width,height;//屏幕的高和宽，用于随机子弹位置 
	private int speed;
	//private int bombadded[];
	
	public Bullets(Image img,int picwidth,int picheight,int width,int height) { 
		super(img,picwidth,picheight); 

		rnd=new Random(); 
		this.width=width; 
		this.height=height; 
	} 



	public void initBullets(int bulletspeed,int bulletstotal){//初始化子弹状态数组 
		bullets=new int[bulletstotal][6];
		speed=bulletspeed;
		for (int i = 0; i < bullets.length; i++) { 
			initBullet(i,bulletspeed); 
		}
	} 



	private void initBullet(int i,int m) {//初始化index号子弹 
	
		bullets[i][0] = (rnd.nextInt() & 0x7fffffff) % 4; //子弹的初始方位
		bullets[i][5] = 1; //alive 1表示存活， 0表示死去 
	
		switch (bullets[i][0]) { 
		case BULLET_TYPE_LEFT: 
			bullets[i][1] = 0; //横坐标
			bullets[i][2] = (rnd.nextInt() & 0x7fffffff) % height; //纵坐标
			bullets[i][3] = (rnd.nextInt() & 0x7fffffff) % m + 1; //横向速度
			bullets[i][4] = (rnd.nextInt() & 0x7fffffff) % m + 1; //纵向速度
			break; 
	
		case BULLET_TYPE_RIGHT: 
			bullets[i][1] = width-6; 
			bullets[i][2] = (rnd.nextInt() & 0x7fffffff) % height;	
			bullets[i][3] = ( (rnd.nextInt() & 0x7fffffff) % m + 1) * -1;  
			bullets[i][4] = (rnd.nextInt() & 0x7fffffff) % m + 1; 
			break; 

		case BULLET_TYPE_TOP: 
			bullets[i][1] = (rnd.nextInt() & 0x7fffffff) % width; 
			bullets[i][2] = 0; 
			bullets[i][3] = (rnd.nextInt() & 0x7fffffff) % m + 1;  
			bullets[i][4] = (rnd.nextInt() & 0x7fffffff) % m + 1; 
			break; 

		case BULLET_TYPE_BOTTOM: 
			bullets[i][1] = (rnd.nextInt() & 0x7fffffff) % width; 
			bullets[i][2] = height-6; 
			bullets[i][3] = (rnd.nextInt() & 0x7fffffff) % m + 1;  
			bullets[i][4] = ( (rnd.nextInt() & 0x7fffffff) % m + 1) * -1; 
			break; 
		} 
	} 



	public void updata(int i){//根据速度更新i子弹下一桢的位置，碰壁反弹 
		
		bullets[i][1]+=bullets[i][3]; 
		bullets[i][2]+=bullets[i][4]; 
		if(bullets[i][1]<0 || bullets[i][1]>width-6){ 
			bullets[i][3]*=-1; 
		} 
	
		if(bullets[i][2]<0 || bullets[i][2]>height-6){ 
			bullets[i][4]*=-1; 
		} 
	} 



	private void paint(Graphics g,int i){//绘画出第i个子弹 
		updataspritepos(i);//更新位置 
		sprite.paint(g);//绘画Sprtie 
	} 



	public void paint(Graphics g) {//绘画整个子弹组 
		for (int i = 0; i < bullets.length; i++) { 
			if(bullets[i][5]==0){//死去的子弹不绘画 
				continue; 
			} 
	
			sprite.setPosition(bullets[i][1],bullets[i][2]); //更新位置 
			sprite.paint(g); 
		} 
	}
	



	public void refreshBullets(Sprite planesprite, boolean needcollision){//刷新子弹数组的状态，并作碰撞处理 
		for (int i = 0; i < bullets.length; i++) { 
			if(bullets[i][5]==0){ //死去的子弹不更新 
				continue; 
			} 
		
			if(needcollision){//如果需要碰撞检测 
				if (isCollision(planesprite, i, 10)) {//如果碰撞，进行处理 
					Navigate.mc.gameover = true; 
					Navigate.mc.explosion.sprite.setPosition(bullets[i][1], bullets[i][2]); 
					bullets[i][5] = 0;//杀死碰撞的子弹 
					continue; 
				} 
			} 
			updata(i);//更新状态 
		} 
	
	} 



	private boolean isCollision(Sprite sprite,int i,int range){ 
	
	//判断是否碰撞 

		boolean result=false; 
		int planeXCenter=sprite.getX()+11; 
		int planeYCenter=sprite.getY()+11; 
		int bulletXCenter=bullets[i][1]+3; 
		int bulletYCenter=bullets[i][2]+3; 
		if(Math.abs(planeXCenter-bulletXCenter) < range){ 
			if (Math.abs(planeYCenter - bulletYCenter )< range) { 
				result = true; 
			} 
		} 
		return result; 
	} 



	private void updataspritepos(int i){//将sprite更新到i字弹的位置 
		sprite.setPosition(bullets[i][1],bullets[i][2]); 
	} 
	

	public void killbullets(Sprite planesprite,int range){//杀死一定区域内的子弹 
		for (int i = 0; i < bullets.length; i++) { 
			if(bullets[i][5]!=0){//alive bullets 
				if(isCollision(planesprite, i, range)){ 
					bullets[i][5]=0; 
					initBullet(i,speed); 
				}
			}
		} 
	} 
	
	
	
	///////////////////////////////////////////
	public boolean addbomb(Sprite planesprite, boolean needcollision){//刷新子弹数组的状态，并作碰撞处理 
		for (int i = 0; i < bullets.length; i++) { 
			if(bullets[i][5]==0){ //死去的子弹不更新 
				continue; 
			} 
		
			if(needcollision){//如果需要碰撞检测 
				if (bombCollision(planesprite, 0, 12)) {//如果碰撞，进行处理 
					//MyGameCanvas.flashplane();
					//Navigate.mc.gameover = true; 
					
					//Navigate.mc.plane.sprite.setPosition(bullets[i][1], bullets[i][2]); 
					bullets[0][5]=0;
					return true;
				} 
			} 
			updata(0);//更新状态 
		} 
		return false;	
	} 
	
	private boolean bombCollision(Sprite sprite,int i,int range){ 
	
	//判断是否碰撞 

		boolean result=false; 
		int planeXCenter=sprite.getX()+11; 
		int planeYCenter=sprite.getY()+11; 
		int bulletXCenter=bullets[i][1]+8; 
		int bulletYCenter=bullets[i][2]+8; 
		if(Math.abs(planeXCenter-bulletXCenter) < range){ 
			if (Math.abs(planeYCenter - bulletYCenter )< range) { 
				result = true; 
			} 
		} 
		return result; 
	} 
	
	
	///////////////////////////////////////
	
	public void initufoBullets(int bulletspeed,int bulletstotal,int x,int y){//初始化子弹状态数组 
		bullets=new int[bulletstotal][6];
		speed=bulletspeed;
		for (int i = 0; i < bullets.length; i++) { 
			initufoBullet(i,bulletspeed,x,y); 
		}
	} 
	
	private void initufoBullet(int i,int m,int x,int y) {//初始化index号子弹 
	
		bullets[i][5] = 1; //alive 1表示存活， 0表示死去 
		bullets[i][1] = x+19; //横坐标
		bullets[i][2] = y+15; //纵坐标
		bullets[i][3] = (rnd.nextInt() & 0x7fffffff) % 8 + 1; //横向速度
		switch((rnd.nextInt() & 0x7fffffff) % 2){
		case(0): bullets[i][3]*=-1;break;
		case(1): bullets[i][3]=bullets[i][3];break;
		}
				 
		bullets[i][4] = (rnd.nextInt() & 0x7fffffff) % 8 + 1; //纵向速度
		switch((rnd.nextInt() & 0x7fffffff) % 2){
		case(0): bullets[i][4]*=-1;break;
		case(1): bullets[i][4]=bullets[i][4];break;
		}
			
			
	
		
	} 
	
	
}