monster.java

一個j2me空戰游戲程序很不錯,可以作為學習之用

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;

public class Monster 
{
	int x,y;
	int dx,dy;
	int bulletspeed;
	int bulletclock,bulletclock2;
	boolean alive;
	public Sprite sprite;//内置的Sprite
	private int width,height;//屏幕的高和宽
	MyGameCanvas parent;
	int life;//生命
	int bexplosion;
	Image img;
	int mission;
	int tempclock;
	
	public Monster(int width,int height,MyGameCanvas p)
	{
		
		try
		{
			img = Image.createImage("/Monster1.png");
		}
		catch (Exception ex)
		{}
		sprite=new Sprite(img,60,60);
		
		this.width=width;
		this.height=height;
		parent=p;
		alive=false;
		mission=1;
	}
	public void initObject(int gate)//初始化某一个关的老怪
	{
		mission=gate;
		switch(gate)
		{
			case 1://Monster1 24桢
			  x=width/2-30;
			  y=-60;
			  dx=2;
			  dy=2;
			  alive=true;
			  sprite.setFrame(0);
			  bulletspeed=30;
			  bulletclock=0;
			  life=100;
			  break;
			case 2:
			  try
		          {
			      img = Image.createImage("/Monster2.png");
		          }
		          catch (Exception ex)
		          {}
		          sprite.setImage(img,66,66);
		          x=width/2-33;
			  y=-66;
			  dx=2;
			  dy=2;
			  alive=true;
			  sprite.setFrame(0);
			  bulletclock=0;
			  bulletclock2=0;
			  life=150;
			  tempclock=100;
			  break;
			case 3:break;
			case 4:break;
		}
			
			
        }
	public void update()
	{
		int i,j;
		int ObjectXCenter,ObjectYCenter;
		int planeXCenter=parent.plane.getX()+12;
         	int planeYCenter=parent.plane.getY()+12;
		if (alive)
		{
			if (mission==1)
			{
				if (y<10)
			        {
				    y+=dy;
			        }
			        else
			        {
				    if (x<-30 || x>width-30)
				    {
					dx=-dx;
				    }
				    x+=dx;
			        }
			        bulletclock++;
			        if (bulletclock==bulletspeed)//可以发子弹了
			        {
				    parent.bullets.initBullet(x,y+60,-4,3,false);
				    parent.bullets.initBullet(x+30,y+60,0,3,false);
				    parent.bullets.initBullet(x+60,y+60,4,3,false);
				    bulletclock=0;
			        }
		        }
		        else if (mission==2)
		        {
		        	if (y<10)
		        	{
		        		y+=dy;
		        	}
		        	else
		        	{
		        		if ( x<0 )
		        		{
		        			if (tempclock>0)
		        			{
		        			    bulletclock++;
			                            if (bulletclock==5)//可以发子弹了
			                            {
				                       parent.bullets.initBullet(x+33,y+66,0,6,false);
				                       parent.bullets.initBullet(x+33,y+54,0,6,false);
				                       parent.bullets.initBullet(x+33,y+42,0,6,false);
				                       bulletclock=0;
			                            }
		        			    tempclock--;
		        		        }
		        		        else
		        		        {
		        		            x+=dx;
		        		        }
		        		}
		        		else if (x>width-66)
		        		{
		        			if (tempclock>0)
		        			{
		        			    bulletclock++;
			                            if (bulletclock==5)//可以发子弹了
			                            {
				                       parent.bullets.initBullet(x+33,y+66,0,6,false);
				                       parent.bullets.initBullet(x+33,y+54,0,6,false);
				                       parent.bullets.initBullet(x+33,y+42,0,6,false);
				                       bulletclock=0;
			                            }
		        			    tempclock--;
		        		        }
		        		        else
		        		        {
		        		            x+=dx;
		        		        }
		        		}
		        		else
		        		{
		        			x+=dx;
		        			tempclock=50;
		        			bulletclock2++;
			                        if (bulletclock2==15)//可以发子弹了
			                        {
				                      parent.bullets.initBullet(x,y+66,-4,3,false);
				                      parent.bullets.initBullet(x+33,y+66,0,3,false);
				                      parent.bullets.initBullet(x+66,y+66,4,3,false);
				                      bulletclock2=0;
			                        }
			                        if (x>=width/2-40 && x<=width/2-25)
			                        {
			                        	parent.enemy.initObject(width/2-2,66,0,4,5,-1);

			                        }
			                        	
		        		}
		        		if (x<0 || x>width-66)
		        		{
		        			dx=-dx;
		        		}
		        		
		        	}
		        }

		        		
		        	 
			//和飞机的冲突检测
			ObjectXCenter=x+30;
                        ObjectYCenter=y+30;
                        if(Math.abs(planeXCenter-ObjectXCenter) < 42)
                        {
                        	if (Math.abs(planeYCenter - ObjectYCenter )< 42)
                        	{ 
                        		parent.gameover = true;
                        	}
                        }
                        //和飞机子弹的冲突检测
                        for(j=0;j<=parent.bullets.mycurrentnum;j++)
                        {
                        	if (parent.bullets.mybullets[j][4]!=0)
                        	{
                        		
                        	 if(Math.abs(parent.bullets.mybullets[j][0]+3-ObjectXCenter) < 30)
                        	 {
                        	 	if (Math.abs(parent.bullets.mybullets[j][1]+3 - ObjectYCenter )< 30)
                        	 	{
                        	 		
                        	 		parent.bullets.mybullets[j][4]=0;
                        	 		parent.explosions.initObject(parent.bullets.mybullets[j][0]-12,parent.bullets.mybullets[j][1]-12,0);
                        	 	        life--;
                        	 	        if (life<=0)
                        	 	        {
                        	 	        	alive=false;
                        	 	        	parent.score+=1000;
                                                        bexplosion=100;
                                                }
                        	 	}
                        	 }
                        	}
                        }
                        	
		}
		else
		{
			//被击毁，爆炸效果
			if (bexplosion>0)
			{
				bexplosion--;
			        switch (bexplosion)
			        {
				case 99:
				  parent.explosions.initObject(x,y,0);
				  parent.explosions.initObject(x+30,y,0);
				  parent.explosions.initObject(x+20,y+20,0);
				  parent.explosions.initObject(x+30,y+15,0);
				  parent.explosions.initObject(x+40,y+40,0);
				  break;
				case 94:
				  parent.explosions.initObject(x+15,y,0);
				  parent.explosions.initObject(x,y+20,0);
				  parent.explosions.initObject(x+30,y+30,0);
				  parent.explosions.initObject(x+40,y+15,0);
				  parent.explosions.initObject(x+40,y+30,0);
				  break;
				case 89:
				  parent.explosions.initObject(x+15,y+15,0);
				  parent.explosions.initObject(x+30,y+15,0);
				  parent.explosions.initObject(x+20,y+20,0);
				  parent.explosions.initObject(x+30,y,0);
				  parent.explosions.initObject(x+40,y+20,0);
				  break;
				case 84:
				  parent.explosions.initObject(x,y,0);
				  parent.explosions.initObject(x+30,y,0);
				  parent.explosions.initObject(x+20,y+20,0);
				  parent.explosions.initObject(x+30,y+15,0);
				  parent.explosions.initObject(x+40,y+10,0);
				  break;
				case 79:
				  parent.explosions.initObject(x+15,y,0);
				  parent.explosions.initObject(x,y+20,0);
				  parent.explosions.initObject(x+30,y+30,0);
				  parent.explosions.initObject(x+40,y+15,0);
				  parent.explosions.initObject(x+40,y+30,0);
				  break;
				case 1:
				  parent.missionfinished=100;
				  break;
				
		                }
		        }

		        	
	
				
		}
				

	}
	public void paint(Graphics g)
	{
		if (alive)
		{
			sprite.setPosition(x,y);
			sprite.nextFrame();
			sprite.paint(g);
		}
		if (bexplosion>68)
		{
			sprite.paint(g);
		}
			

			
	}
	public void reset()
	{
		alive=false;
		bexplosion=0;
	}
		
}