//
// PacMan
// Another 1 day game (created in 5 hours).
//
// (C)2000
// Brian Postma
// b.postma@hetnet.nl
// http://www.homepages.hetnet.nl/~brianpostma
//

import java.awt.*;
import java.applet.Applet;

public class PacMan extends Applet implements Runnable
{
  Dimension	d;
  Font 		largefont = new Font("Helvetica", Font.BOLD, 24);
  Font		smallfont = new Font("Helvetica", Font.BOLD, 14);

  FontMetrics	fmsmall, fmlarge;
  Graphics	goff;
  Image		ii;
  Thread	thethread;
  MediaTracker  thetracker = null;
  Color		dotcolor=new Color(192,192,0);
  int		bigdotcolor=192;
  int		dbigdotcolor=-2;
  Color		mazecolor;

  boolean	ingame=false;
  boolean	showtitle=true;
  boolean       scared=false;
  boolean       dying=false;

  final int	screendelay=120;
  final int     blocksize=24;
  final int     nrofblocks=15;
  final int     scrsize=nrofblocks*blocksize;
  final int	animdelay=8;
  final int     pacanimdelay=2;
  final int     ghostanimcount=2;
  final int     pacmananimcount=4;
  final int     maxghosts=12;
  final int	pacmanspeed=6;

  int		animcount=animdelay;
  int           pacanimcount=pacanimdelay;
  int		pacanimdir=1;
  int		count=screendelay;
  int		ghostanimpos=0;
  int		pacmananimpos=0;
  int		nrofghosts=6;
  int		pacsleft,score;
  int		deathcounter;
  int[]		dx,dy;
  int[]		ghostx, ghosty, ghostdx, ghostdy, ghostspeed;

  Image		ghost1,ghost2,ghostscared1,ghostscared2;
  Image		pacman1, pacman2up, pacman2left, pacman2right, pacman2down;
  Image		pacman3up, pacman3down, pacman3left, pacman3right;
  Image		pacman4up, pacman4down, pacman4left, pacman4right;

  int		pacmanx, pacmany, pacmandx, pacmandy;
  int		reqdx, reqdy, viewdx, viewdy;
  int		scaredcount, scaredtime;
  final	int	maxscaredtime=120;
  final int     minscaredtime=20;

  final short   level1data[] = {
	19,26,26,22, 9,12,19,26,22, 9,12,19,26,26,22,
	37,11,14,17,26,26,20,15,17,26,26,20,11,14,37,
	17,26,26,20,11, 6,17,26,20, 3,14,17,26,26,20,
	21, 3, 6,25,22, 5,21, 7,21, 5,19,28, 3, 6,21,
	21, 9, 8,14,21,13,21, 5,21,13,21,11, 8,12,21,
	25,18,26,18,24,18,28, 5,25,18,24,18,26,18,28,
	 6,21, 7,21, 7,21,11, 8,14,21, 7,21, 7,21,03,
	 4,21, 5,21, 5,21,11,10,14,21, 5,21, 5,21, 1,
	12,21,13,21,13,21,11,10,14,21,13,21,13,21, 9,
	19,24,26,24,26,16,26,18,26,16,26,24,26,24,22,
	21, 3, 2, 2, 6,21,15,21,15,21, 3, 2, 2,06,21,
	21, 9, 8, 8, 4,17,26, 8,26,20, 1, 8, 8,12,21,
	17,26,26,22,13,21,11, 2,14,21,13,19,26,26,20,
	37,11,14,17,26,24,22,13,19,24,26,20,11,14,37,
	25,26,26,28, 3, 6,25,26,28, 3, 6,25,26,26,28  };

  final int	validspeeds[] = { 1,2,3,4,6,8 };
  final int	maxspeed=6;

  int		currentspeed=3;
  short[]	screendata;


  public String getAppletInfo()
  {
    return("PacMan - by Brian Postma");
  }

  public void init()
  {
    short i;
    GetImages();

    screendata=new short[nrofblocks*nrofblocks];

    Graphics g;
    d = size();
    setBackground(Color.black);
    g=getGraphics();
    g.setFont(smallfont);
    fmsmall = g.getFontMetrics();
    g.setFont(largefont);
    fmlarge = g.getFontMetrics();
    ghostx=new int[maxghosts];
    ghostdx=new int[maxghosts];
    ghosty=new int[maxghosts];
    ghostdy=new int[maxghosts];
    ghostspeed=new int[maxghosts];
    dx=new int[4];
    dy=new int[4];
    GameInit();
  }


  public void GameInit()
  {
    pacsleft=3;
    score=0;
    scaredtime=maxscaredtime;
    LevelInit();
    nrofghosts=6;
    currentspeed=3;
    scaredtime=maxscaredtime;
  }


  public void LevelInit()
  {
    int  i;
    for (i=0; i<nrofblocks*nrofblocks; i++)
      screendata[i]=level1data[i];

    LevelContinue();
  }


  public void LevelContinue()
  {
    short i;
    int dx=1;
    int random;

    for (i=0; i<nrofghosts; i++)
    {
      ghosty[i]=7*blocksize;
      ghostx[i]=7*blocksize;
      ghostdy[i]=0;
      ghostdx[i]=dx;
      dx=-dx;
      random=(int)(Math.random()*(currentspeed+1));
      if (random>currentspeed)
        random=currentspeed;
      ghostspeed[i]=validspeeds[random];
    }
    screendata[7*nrofblocks+6]=10;
    screendata[7*nrofblocks+8]=10;
    pacmanx=7*blocksize;
    pacmany=11*blocksize;
    pacmandx=0;
    pacmandy=0;
    reqdx=0;
    reqdy=0;
    viewdx=-1;
    viewdy=0;
    dying=false;
    scared=false;
  }


  public void GetImages()
  {
    thetracker=new MediaTracker(this);

    ghost1=getImage(getDocumentBase(),"pacpix/Ghost1.gif");
    thetracker.addImage(ghost1,0);
    ghost2=getImage(getDocumentBase(),"pacpix/Ghost2.gif");
    thetracker.addImage(ghost2,0);
    ghostscared1=getImage(getDocumentBase(),"pacpix/GhostScared1.gif");
    thetracker.addImage(ghostscared1,0);
    ghostscared2=getImage(getDocumentBase(),"pacpix/GhostScared2.gif");
    thetracker.addImage(ghostscared2,0);

    pacman1=getImage(getDocumentBase(),"pacpix/PacMan1.gif");
    thetracker.addImage(pacman1,0);
    pacman2up=getImage(getDocumentBase(),"pacpix/PacMan2up.gif");
    thetracker.addImage(pacman2up,0);
    pacman3up=getImage(getDocumentBase(),"pacpix/PacMan3up.gif");
    thetracker.addImage(pacman3up,0);
    pacman4up=getImage(getDocumentBase(),"pacpix/PacMan4up.gif");
    thetracker.addImage(pacman4up,0);

    pacman2down=getImage(getDocumentBase(),"pacpix/PacMan2down.gif");
    thetracker.addImage(pacman2down,0);
    pacman3down=getImage(getDocumentBase(),"pacpix/PacMan3down.gif");
    thetracker.addImage(pacman3down,0);
    pacman4down=getImage(getDocumentBase(),"pacpix/PacMan4down.gif");
    thetracker.addImage(pacman4down,0);

    pacman2left=getImage(getDocumentBase(),"pacpix/PacMan2left.gif");
    thetracker.addImage(pacman2left,0);
    pacman3left=getImage(getDocumentBase(),"pacpix/PacMan3left.gif");
    thetracker.addImage(pacman3left,0);
    pacman4left=getImage(getDocumentBase(),"pacpix/PacMan4left.gif");
    thetracker.addImage(pacman4left,0);

    pacman2right=getImage(getDocumentBase(),"pacpix/PacMan2right.gif");
    thetracker.addImage(pacman2right,0);
    pacman3right=getImage(getDocumentBase(),"pacpix/PacMan3right.gif");
    thetracker.addImage(pacman3right,0);
    pacman4right=getImage(getDocumentBase(),"pacpix/PacMan4right.gif");
    thetracker.addImage(pacman4right,0);

    try
    {
      thetracker.waitForAll();
    }
    catch (InterruptedException e)
    {
      return;
    }
  }


  public boolean keyDown(Event e, int key)
  {
    if (ingame)
    {
      if (key == Event.LEFT)
      {
        reqdx=-1;
        reqdy=0;
      }
      else if (key == Event.RIGHT)
      {
        reqdx=1;
        reqdy=0;
      }
      else if (key == Event.UP)
      {
        reqdx=0;
        reqdy=-1;
      }
      else if (key == Event.DOWN)
      {
        reqdx=0;
        reqdy=1;
      }
      else if (key == Event.ESCAPE)
      {
        ingame=false;
      }
    }
    else
    {
      if (key == 's' || key == 'S')
      {
        ingame=true;
        GameInit();
      }
    }
    return true;
  }


  public boolean keyUp(Event e, int key)
  {
    if (key == Event.LEFT || key == Event.RIGHT || key == Event.UP ||  key == Event.DOWN)
    {
      reqdx=0;
      reqdy=0;
    }
    return true;
  }


  public void paint(Graphics g)
  {
    String s;
    Graphics gg;

    if (goff==null && d.width>0 && d.height>0)
    {
      ii = createImage(d.width, d.height);
      goff = ii.getGraphics();
    }
    if (goff==null || ii==null)
      return;

    goff.setColor(Color.black);
    goff.fillRect(0, 0, d.width, d.height);

    DrawMaze();
    DrawScore();
    DoAnim();
    if (ingame)
      PlayGame();
    else
      PlayDemo();

    g.drawImage(ii, 0, 0, this);
  }


  public void DoAnim()
  {
    animcount--;
    if (animcount<=0)
    {
      animcount=animdelay;
      ghostanimpos++;
      if (ghostanimpos>=ghostanimcount)
        ghostanimpos=0;
    }
    pacanimcount--;
    if (pacanimcount<=0)
    {
      pacanimcount=pacanimdelay;
      pacmananimpos=pacmananimpos+pacanimdir;
      if (pacmananimpos==(pacmananimcount-1) ||  pacmananimpos==0)
        pacanimdir=-pacanimdir;
    }
  }


  public void PlayGame()
  {
    if (dying)
    {
      Death();
    }
    else
    {
      CheckScared();
      MovePacMan();
      DrawPacMan();
      MoveGhosts();
      CheckMaze();
    }
  }


  public void PlayDemo()
  {
    CheckScared();
    MoveGhosts();
    ShowIntroScreen();
  }


  public void Death()
  {
    int k;

    deathcounter--;
    k=(deathcounter&15)/4;
    switch(k)
    {
      case 0:
        goff.drawImage(pacman4up,pacmanx+1,pacmany+1,this);
        break;
      case 1:
        goff.drawImage(pacman4right,pacmanx+1,pacmany+1,this);
        break;
      case 2:
        goff.drawImage(pacman4down,pacmanx+1,pacmany+1,this);
        break;
      default:
        goff.drawImage(pacman4left,pacmanx+1,pacmany+1,this);
    }
    if (deathcounter==0)
    {
      pacsleft--;
      if (pacsleft==0)
        ingame=false;
      LevelContinue();
    }
  }


  public void MoveGhosts()
  {
    short i;
    int pos;
    int count;

    for (i=0; i<nrofghosts; i++)
    {
      if (ghostx[i]%blocksize==0 && ghosty[i]%blocksize==0)
      {
        pos=ghostx[i]/blocksize+nrofblocks*(int)(ghosty[i]/blocksize);

        count=0;
        if ((screendata[pos]&1)==0 && ghostdx[i]!=1)
        {
          dx[count]=-1;
          dy[count]=0;
          count++;
        }
        if ((screendata[pos]&2)==0 && ghostdy[i]!=1)
        {
          dx[count]=0;
          dy[count]=-1;
          count++;
        }
        if ((screendata[pos]&4)==0 && ghostdx[i]!=-1)
        {
          dx[count]=1;
          dy[count]=0;
          count++;
        }
        if ((screendata[pos]&8)==0 && ghostdy[i]!=-1)
        {
          dx[count]=0;
          dy[count]=1;
          count++;
        }
        if (count==0)
        {
          if ((screendata[pos]&15)==15)
          {
            ghostdx[i]=0;
            ghostdy[i]=0;
          }
          else
          {
            ghostdx[i]=-ghostdx[i];
            ghostdy[i]=-ghostdy[i];
          }
        }
        else
        {
          count=(int)(Math.random()*count);
          if (count>3) count=3;
          ghostdx[i]=dx[count];
          ghostdy[i]=dy[count];
        }
      }
      ghostx[i]=ghostx[i]+(ghostdx[i]*ghostspeed[i]);
      ghosty[i]=ghosty[i]+(ghostdy[i]*ghostspeed[i]);
      DrawGhost(ghostx[i]+1,ghosty[i]+1);

      if (pacmanx>(ghostx[i]-12) && pacmanx<(ghostx[i]+12) &&
          pacmany>(ghosty[i]-12) && pacmany<(ghosty[i]+12) && ingame)
      {
        if (scared)
        {
          score+=10;
          ghostx[i]=7*blocksize;
          ghosty[i]=7*blocksize;
        }
        else
        {
          dying=true;
          deathcounter=64;
        }
      }
    }
  }


  public void DrawGhost(int x, int y)
  {
    if (ghostanimpos==0 && !scared)
    {
      goff.drawImage(ghost1,x,y,this);
    }
    else if (ghostanimpos==1 && !scared)
    {
      goff.drawImage(ghost2,x,y,this);
    }
    else if (ghostanimpos==0 && scared)
    {
      goff.drawImage(ghostscared1,x,y,this);
    }
    else if (ghostanimpos==1 && scared)
    {
      goff.drawImage(ghostscared2,x,y,this);
    }
  }


  public void MovePacMan()
  {
    int     pos;
    short   ch;

    if (reqdx==-pacmandx && reqdy==-pacmandy)
    {
      pacmandx=reqdx;
      pacmandy=reqdy;
      viewdx=pacmandx;
      viewdy=pacmandy;
    }
    if (pacmanx%blocksize==0 && pacmany%blocksize==0)
    {
      pos=pacmanx/blocksize+nrofblocks*(int)(pacmany/blocksize);
      ch=screendata[pos];
      if ((ch&16)!=0)
      {
        screendata[pos]=(short)(ch&15);
        score++;
      }
      if ((ch&32)!=0)
      {
        scared=true;
        scaredcount=scaredtime;
        screendata[pos]=(short)(ch&15);
        score+=5;
      }

      if (reqdx!=0 || reqdy!=0)
      {
        if (!( (reqdx==-1 && reqdy==0 && (ch&1)!=0) ||
           (reqdx==1 && reqdy==0 && (ch&4)!=0) ||
           (reqdx==0 && reqdy==-1 && (ch&2)!=0) ||
           (reqdx==0 && reqdy==1 && (ch&8)!=0)))
        {
          pacmandx=reqdx;
          pacmandy=reqdy;
          viewdx=pacmandx;
          viewdy=pacmandy;
        }
      }

      // Check for standstill
      if ( (pacmandx==-1 && pacmandy==0 && (ch&1)!=0) ||
           (pacmandx==1 && pacmandy==0 && (ch&4)!=0) ||
           (pacmandx==0 && pacmandy==-1 && (ch&2)!=0) ||
           (pacmandx==0 && pacmandy==1 && (ch&8)!=0))
      {
        pacmandx=0;
        pacmandy=0;
      }
    }
    pacmanx=pacmanx+pacmanspeed*pacmandx;
    pacmany=pacmany+pacmanspeed*pacmandy;
  }


  public void DrawPacMan()
  {
    if (viewdx==-1)
      DrawPacManLeft();
    else if (viewdx==1)
      DrawPacManRight();
    else if (viewdy==-1)
      DrawPacManUp();
    else
      DrawPacManDown();
  }

  public void DrawPacManUp()
  {
    switch(pacmananimpos)
    {
      case 1:
        goff.drawImage(pacman2up,pacmanx+1,pacmany+1,this);
        break;
      case 2:
        goff.drawImage(pacman3up,pacmanx+1,pacmany+1,this);
        break;
      case 3:
        goff.drawImage(pacman4up,pacmanx+1,pacmany+1,this);
        break;
      default:
        goff.drawImage(pacman1,pacmanx+1,pacmany+1,this);
        break;
    }
  }


  public void DrawPacManDown()
  {
    switch(pacmananimpos)
    {
      case 1:
        goff.drawImage(pacman2down,pacmanx+1,pacmany+1,this);
        break;
      case 2:
        goff.drawImage(pacman3down,pacmanx+1,pacmany+1,this);
        break;
      case 3:
        goff.drawImage(pacman4down,pacmanx+1,pacmany+1,this);
        break;
      default:
        goff.drawImage(pacman1,pacmanx+1,pacmany+1,this);
        break;
    }
  }


  public void DrawPacManLeft()
  {
    switch(pacmananimpos)
    {
      case 1:
        goff.drawImage(pacman2left,pacmanx+1,pacmany+1,this);
        break;
      case 2:
        goff.drawImage(pacman3left,pacmanx+1,pacmany+1,this);
        break;
      case 3:
        goff.drawImage(pacman4left,pacmanx+1,pacmany+1,this);
        break;
      default:
        goff.drawImage(pacman1,pacmanx+1,pacmany+1,this);
        break;
    }
  }


  public void DrawPacManRight()
  {
    switch(pacmananimpos)
    {
      case 1:
        goff.drawImage(pacman2right,pacmanx+1,pacmany+1,this);
        break;
      case 2:
        goff.drawImage(pacman3right,pacmanx+1,pacmany+1,this);
        break;
      case 3:
        goff.drawImage(pacman4right,pacmanx+1,pacmany+1,this);
        break;
      default:
        goff.drawImage(pacman1,pacmanx+1,pacmany+1,this);
        break;
    }
  }


  public void DrawMaze()
  {
    short i=0;
    int x,y;

    bigdotcolor=bigdotcolor+dbigdotcolor;
    if (bigdotcolor<=64 || bigdotcolor>=192)
      dbigdotcolor=-dbigdotcolor;

    for (y=0; y<scrsize; y+=blocksize)
    {
      for (x=0; x<scrsize; x+=blocksize)
      {
	goff.setColor(mazecolor);
        if ((screendata[i]&1)!=0)
	{
           goff.drawLine(x,y,x,y+blocksize-1);
	}
	if ((screendata[i]&2)!=0)
	{
          goff.drawLine(x,y,x+blocksize-1,y);
	}
	if ((screendata[i]&4)!=0)
	{
          goff.drawLine(x+blocksize-1,y,x+blocksize-1,y+blocksize-1);
	}
	if ((screendata[i]&8)!=0)
	{
          goff.drawLine(x,y+blocksize-1,x+blocksize-1,y+blocksize-1);
	}
	if ((screendata[i]&16)!=0)
	{
          goff.setColor(dotcolor);
          goff.fillRect(x+11,y+11,2,2);
	}
	if ((screendata[i]&32)!=0)
	{
          goff.setColor(new Color(224,224-bigdotcolor,bigdotcolor));
          goff.fillRect(x+8,y+8,8,8);
	}
	i++;
      }
    }
  }

  public void ShowIntroScreen()
  {
    String s;

    goff.setFont(largefont);

    goff.setColor(new Color(0,32,48));
    goff.fillRect(16, scrsize/2 - 40, scrsize-32,80);
    goff.setColor(Color.white);
    goff.drawRect(16, scrsize/2 - 40, scrsize-32,80);

    if (showtitle)
    {
      s="Java PacMan";
      scared=false;

      goff.setColor(Color.white);
      goff.drawString(s,(scrsize-fmlarge.stringWidth(s)) / 2 +2, scrsize/2 - 20 +2);
      goff.setColor(new Color(96,128,255));
      goff.drawString(s,(scrsize-fmlarge.stringWidth(s)) / 2, scrsize/2 - 20);

      s="(c)2000 by Brian Postma";
      goff.setFont(smallfont);
      goff.setColor(new Color(255,160,64));
      goff.drawString(s,(scrsize-fmsmall.stringWidth(s))/2,scrsize/2 + 10);

      s="b.postma@hetnet.nl";
      goff.setColor(new Color(255,160,64));
      goff.drawString(s,(scrsize-fmsmall.stringWidth(s))/2,scrsize/2 + 30);
    }
    else
    {
      goff.setFont(smallfont);
      goff.setColor(new Color(96,128,255));
      s="'S' to start game";
      goff.drawString(s,(scrsize-fmsmall.stringWidth(s))/2,scrsize/2 - 10);
      goff.setColor(new Color(255,160,64));
      s="Use cursor keys to move";
      goff.drawString(s,(scrsize-fmsmall.stringWidth(s))/2,scrsize/2 + 20);
      scared=true;
    }
    count--;
    if (count<=0)
    { count=screendelay; showtitle=!showtitle; }
  }


  public void DrawScore()
  {
    int i;
    String s;

    goff.setFont(smallfont);
    goff.setColor(new Color(96,128,255));
    s="Score: "+score;
    goff.drawString(s,scrsize/2+96,scrsize+16);
    for (i=0; i<pacsleft; i++)
    {
      goff.drawImage(pacman3left,i*28+8,scrsize+1,this);
    }
  }


  public void CheckScared()
  {
    scaredcount--;
    if (scaredcount<=0)
      scared=false;

    if (scared && scaredcount>=30)
      mazecolor=new Color(192,32,255);
    else
      mazecolor=new Color(32,192,255);

    if (scared)
    {
      screendata[7*nrofblocks+6]=11;
      screendata[7*nrofblocks+8]=14;
    }
    else
    {
      screendata[7*nrofblocks+6]=10;
      screendata[7*nrofblocks+8]=10;
    }
  }


  public void CheckMaze()
  {
    short i=0;
    boolean finished=true;

    while (i<nrofblocks*nrofblocks && finished)
    {
      if ((screendata[i]&48)!=0)
        finished=false;
      i++;
    }
    if (finished)
    {
      score+=50;
      DrawScore();
      try
      {
        Thread.sleep(3000);
      }
      catch (InterruptedException e)
      {
      }
      if (nrofghosts < maxghosts)
        nrofghosts++;
      if (currentspeed<maxspeed)
        currentspeed++;
      scaredtime=scaredtime-20;
      if (scaredtime<minscaredtime)
        scaredtime=minscaredtime;
      LevelInit();
    }
  }


  public void run()
  {
    long  starttime;
    Graphics g;

    Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
    g=getGraphics();

    while(true)
    {
      starttime=System.currentTimeMillis();
      try
      {
        paint(g);
        starttime += 40;
        Thread.sleep(Math.max(0, starttime-System.currentTimeMillis()));
      }
      catch (InterruptedException e)
      {
        break;
      }
    }
  }

  public void start()
  {
    if (thethread == null) {
      thethread = new Thread(this);
      thethread.start();
    }
  }

  public void stop()
  {
    if (thethread != null) {
      thethread.stop();
      thethread = null;
    }
  }
}