frog.java

青蛙吃小虫的游戏

import java.awt.*;
import java.awt.image.*;
import java.net.*;

public final class frog extends java.applet.Applet implements Runnable
{
	int i,j,k,counter=0,flyX[],flyY[],flyOldX[],flyOldY[],flyDx[],flyDy[];
	int nearX,nearY,nearNum,eatDx,eatDy;
	int eatState=0;
	int flyBaseX[],flyBaseY[],tongueX[]={18,22,0,0},tongueY[]={27,28,0,0};
	double tongue;
	boolean flyOn[]={false,false,false,false,false};
	int currHead=0, count=0;
	final int headList[]={0,1,2,3,2,1};
	double headcount=0;
	Image collection,offImage,frog,frogheads[],legs,flies[];
	Graphics offGraphics;
	MediaTracker tracker;
	ImageFilter filter;
	Thread updateThread;
	Math m;
        Font disp1, disp2;
        String str1="哈哈!";
        String str2="计数:";
        Color lightBlue = new Color(0,50,255);
        Color deepGreen = new Color(0,200,0);

	public void init()
	{
                disp1 = new Font("宋体",Font.BOLD,30);
		disp2 = new Font("楷体",Font.ITALIC,20);
		offImage=createImage(96,60);
		offGraphics=offImage.getGraphics();
		tracker=new MediaTracker(this);
		collection = getImage(getCodeBase(),"froggies.gif");
		tracker.addImage(collection,0);
		try
		{
			tracker.waitForID(0);
		}
			catch(InterruptedException e) {}

		frogheads=new Image[8];
		flies=new Image[3];
		filter=new CropImageFilter(0,0,96,60);
		frog=createImage(new FilteredImageSource(collection.getSource(),filter));
		tracker.addImage(frog,1);
		for (i=0;i<4;i++)
			for (j=0;j<2;j++)
			{
				filter=new CropImageFilter(j*48,60+i*40,48,40);
				frogheads[i*2+j]=createImage(new FilteredImageSource(
					collection.getSource(),filter));
				tracker.addImage(frogheads[i*2+j],1);
			}
		filter=new CropImageFilter(48,40,48,20);
		legs=createImage(new FilteredImageSource(collection.getSource(),filter));
		tracker.addImage(legs,1);
		for (j=0;j<3;j++)
		{
			filter=new CropImageFilter(j*13,220,13,8);
			flies[j]=createImage(new FilteredImageSource(
				collection.getSource(),filter));
			tracker.addImage(flies[j],1);
		}
		flyX=new int[5];
		flyY=new int[5];
		flyOldX=new int[5];
		flyOldY=new int[5];
		flyDx=new int[5];
		flyDy=new int[5];
		flyBaseX=new int[5];
		flyBaseY=new int[5];

		try
		{
			tracker.waitForID(1);
		}
			catch(InterruptedException e) {}

		resize(500,60);
	}

	public void run()
	{
		while (updateThread !=null)
		{
			try
			{
				updateThread.sleep(75);
			} catch (InterruptedException e) {}
			counter=(counter+1)% 30;
			nearX=500;
			nearY=0;
			nearNum=-1;
			for (j=0;j<5;j++)
			{
                                if (flyOn[j]) 
				{
					flyOldX[j]=flyX[j];
					flyOldY[j]=flyY[j];
                                        if (counter==j)         
						flyBaseX[j]=(int)(100+m.random()*400);
					if (counter==(j+10))
						flyBaseY[j]=(int)(16+m.random()*19);
						
                                        if ((flyX[j]<flyBaseX[j])&&(flyDx[j]<11)) 
						flyDx[j]+=2;
					else if ((flyX[j]>flyBaseX[j])&&(flyDx[j]>-11))
						flyDx[j]-=2;
					if ((flyY[j]<flyBaseY[j])&&(flyDy[j]<7))
						flyDy[j]+=2;
					else if ((flyY[j]>flyBaseY[j])&&(flyDy[j]>-7))
						flyDy[j]-=2;
                                        flyX[j]+=flyDx[j]; 
					flyY[j]+=flyDy[j];
                                        if (flyX[j]<nearX) 
					{
						nearX=flyX[j];
						nearY=flyY[j];
						nearNum=j;
					}
				}
                                else 
				{
                                        if (m.random()<0.01) 
					{
						flyX[j]=500;
						flyY[j]=25;
						flyBaseY[j]=25;
						flyDx[j]=0;
						flyDy[j]=0;
						flyOn[j]=true;
					}
				}
			}
			switch (eatState)
			{
                                case 0: 
                                        headcount+=0.003*(700-nearX); 
					if (headcount>12)
						headcount-=6;
					currHead=headList[((int)headcount)% 6];

                                        if ((nearX>96)&&(nearX<130)&&(nearY<40)&&(nearY>6)) 
					{
						eatState=1;
						eatDx=nearX-59;
						eatDy=nearY-22;
						tongue=1;
						flyOn[nearNum]=false;
						currHead=4;
					}
					break;
                                case 1: 
					tongue=tongue-0.3;
					if (tongue<0)
					{
						eatState=2;
						headcount=0;
                                                count+=1;
						currHead=5;
					}
					break;
                                case 2: 
					headcount+=0.1;
					if (headcount<0.6)
						currHead=5;
					else if (headcount<3.3)
						currHead=6+(((int)(headcount*2))&1);
					else if (headcount<4.4)
						currHead=5;
					else
						eatState=0;
					break;
				default:
					break;
			}
			repaint();
		}
	}

	public void start()
	{
		if (updateThread==null)
		{
			updateThread=new Thread(this,"Flies");
			updateThread.start();
		}
	}

	public void stop()
	{
		if ((updateThread!=null)&&(updateThread.isAlive()))
		{
			updateThread.stop();
		}
		updateThread=null;
	}

	public void paint(Graphics g)
	{
		g.drawImage(frog,0,0,this);
	}

	public void update(Graphics g)
	{
			offGraphics.setColor(lightBlue);
			offGraphics.fillRect(0,0,96,60);
			offGraphics.drawImage(legs,0,40,this);
			offGraphics.drawImage(frogheads[currHead],0,0,this);
                        if (eatState==1) 
			{
				offGraphics.setColor(Color.pink);
				tongueX[2]=(int)(18+tongue*eatDx);
				tongueY[2]=(int)(30+tongue*eatDy);
				tongueX[3]=tongueX[2];
				tongueY[3]=(int)(28+tongue*eatDy);
				offGraphics.fillPolygon(tongueX,tongueY,4);
				offGraphics.drawPolygon(tongueX,tongueY,4);
				offGraphics.drawImage(flies[2],(int)(11+tongue*eatDx),(int)(25+tongue*eatDy),this);
			}
                        g.setColor(deepGreen);
                        g.fillRect(0,60,600,60);
                        g.setColor(lightBlue); 
			g.fillRect(144,0,456,60);
			g.drawImage(offImage,48,0,this);
                        for (k=0;k<5;k++) 
				if (flyOn[k])
					g.drawImage(flies[counter & 1],flyX[k],flyY[k],this);
                        if (eatState==2 & headcount==0)
                        {
                                if(count%5==0)     
                                        play(getCodeBase(),"spacemusic.au");
                                else    
                                        play(getCodeBase(),"drip.au");
                        }                
                        g.setColor(Color.red);
                        if (count%5==0)
                        {
                                g.setFont(disp1);
                                g.drawString(str1,100,30);
                        }
                        g.setFont(disp2);
                        g.drawString(str2+count,400,100);
	}
}