Have something to say? Contribute New Article Reply to this Article
I just found this code for PAC MAN...what does this mean???
I've highlighted the code in question in red. Can somebody tell me how the red code makes Pac man and the Ghosts move?
//
// PacMan
// Another 1 day game (created in 5 hours).
//
// (C)2000
// Brian Postma
// [email]b.postma@hetnet.nl[/email]
// <a href="http://www.homepages.hetnet.nl/~brianpostma">http://www.homepages.hetnet.nl/~brianpostma</a>
//
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;
}
}
}another question, where in the code does it tell you how to control pac man?
I can't see how it allows the user to interact with the code and mac pac man move left, right, up and down!
please help!
What you don't understand about the code? The method names explain themselves about what they are doing. Could you pinpoint more about which part of the code you don't understand?
@spikehackerinc when you decide to write appropriate questions then you are more then welcome to create new thread.
In the future please do not reopen old forgotten threads.
Closed!
peter_budo
Code tags enforcer
Moderator
15,436 posts since Dec 2004
Reputation Points: 2,806
Solved Threads: 902
This article has been dead for over three months
You
© 2012 DaniWeb® LLC
