turtles-own [ home-pos ]
patches-own [ pellet-grid? ]  ;; true/false: is a pellet here initially?

breed [ pellets pellet ]
pellets-own [ powerup? ]

breed [ bonuses bonus ]
bonuses-own [ value countdown ]

breed [ pacmans pacman ]
pacmans-own  [ new-heading ]

breed [ ghosts ghost ]
ghosts-own  [ eaten? ]

globals [
  level         ;; current level
  score         ;; your score
  lives         ;; remaining lives
  extra-lives   ;; total number of extra lives you've won
  scared        ;; time until ghosts aren't scared (0 means not scared)
  level-over?   ;; true when a level is complete
  dead?         ;; true when Pac-Man is loses a life
  next-bonus-in ;; time until next bonus is created
  tool which-ghost ;; variables needed to properly load levels 4 and above.
]

;;;;;;;;;;;;;;;;;;;;;;;;
;;; Setup Procedures ;;;
;;;;;;;;;;;;;;;;;;;;;;;;

to new  ;; Observer Button
  clear-all
  set level 1
  load-map
  set score 0
  set lives 3
  set extra-lives 0
  set scared 0
  set level-over? false
  reset-ticks
end

to load-map  ;; Observer Procedure
  ;; Filenames of Level Files
  let maps ["pacmap1.csv" "pacmap2.csv" "pacmap3.csv"
            "pacmap4.csv" "pacmap5.csv"]
  let current-score score
  let current-lives lives
  let current-extra-lives extra-lives
  let current-difficulty difficulty

  ifelse ((level - 1) < length maps)
  [ import-world item (level - 1) maps
    set score current-score
    set lives current-lives
    set extra-lives current-extra-lives
    set difficulty current-difficulty
    set dead? false
    ask pacmans
    [ set home-pos list xcor ycor ]
    ask ghosts
    [ set home-pos list xcor ycor ]
  ]
  [ set level 1
    load-map ]
end

;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Runtime Procedures ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;

to play  ;; Observer Forever Button
  ;; Only true at this point if you died and are trying to continue
  if dead?
  [ stop ]
  every (1 - difficulty / 10)
  [ move-pacman ]
  every 0.25
  [ update-bonuses ]
  if floor (score / 35000) > extra-lives
  [ set lives lives + 1
    set extra-lives extra-lives + 1 ]
  if dead?
  [ ifelse lives = 0
    [ user-message word "Game Over!\nScore: " score ]
    [ set lives lives - 1
      ifelse lives = 0
      [ user-message "You died!\nNo lives left." ]
      [ ifelse lives = 1
        [ user-message "You died!\nOnly 1 life left." ]
        [ user-message (word "You died!\nOnly " lives " lives left.") ]
      ]
      ask pacmans
      [ setxy (item 0 home-pos) (item 1 home-pos)
        set heading 0
      ]
      ask ghosts
      [ setxy (item 0 home-pos) (item 1 home-pos)
        set heading 0
        set shape "ghost"
      ]
      set dead? false
    ]
    stop
  ]
  if level-over?
  [ user-message word "Level Complete!\nScore: " score  ;; \n means start a new line
    set level level + 1
    load-map
    set level-over? false
    stop ]
  every 1.6 * (1 - difficulty / 10)
  [ move-ghosts ]
  every next-bonus-in
  [ make-bonus ]
  display
end

to move-pacman  ;; Observer Procedure
  ask pacmans
  [ ;; move forward unless blocked by wall
    let old-heading heading
    set heading new-heading
    if [pcolor] of patch-ahead 1 != black
    [ set heading old-heading ]
    if [pcolor] of patch-ahead 1 = black
    [ fd 1 ]
    consume
    ;; Level ends when all pellets are eaten
    if not any? pellets
    [ set level-over? true ]
    ;; Animation
    ifelse shape = "pacman"
    [ set shape "pacman open" ]
    [ set shape "pacman" ]
  ]
end

to consume  ;; Pacman Procedure
  ;; Consume Bonuses
  if any? bonuses-here
  [ set score score + sum [value] of bonuses-here
    ask bonuses-here [ die ] ]

  ;; Consume Pellets
  if any? pellets-here
  [ ifelse [powerup?] of one-of pellets-here
    [ set score score + 500
      set scared 40
      ask ghosts
      [ if not eaten?
        [ set shape "scared" ] ]
    ]
    [ set score score + 100 ]
    ask pellets-here [ die ] ]

  ;; Ghosts
  if any? ghosts-here with [not eaten?]
  [ ifelse scared = 0
    [ set dead? true ]
    [ ask ghosts-here with [not eaten?]
      [ set eaten? true
        set shape "eyes"
        set score score + 500 ]
    ]
  ]
end

to update-bonuses  ;; Observer Procedure
  ask bonuses
  [ set heading heading + 13
    set countdown countdown - 1
    if countdown = 0
    [ die ] ]
end

to move-ghosts  ;; Observer Procedure
  ask ghosts
  [ ifelse eaten?
    [ if [pcolor] of patch-at 0 1 = gray
      [ set eaten? false
        set shape "ghost" ]
      return-home
    ]
    [ choose-heading ]
    fd 1
  ]
  if scared > 0
  [ set scared scared - 1
    ifelse scared < 10 and scared mod 2 = 0
    [ ask ghosts with [not eaten?]
      [ set shape "ghost" ] ]
    [ ask ghosts with [not eaten?]
      [ set shape "scared" ] ]
    if scared = 0
    [ ask ghosts with [not eaten?]
      [ set shape "ghost" ]
    ]
  ]
end

to return-home  ;; Ghosts Procedure
  let dirs clear-headings
  let new-dirs remove opposite heading dirs
  let home-dir 0
  if pcolor != gray
    [ set home-dir towards one-of patches with [pcolor = gray] ]
  let home-path 90 * round (home-dir / 90)

  if length new-dirs = 1
  [ set heading item 0 new-dirs ]
  if length new-dirs > 1
  [ ifelse position home-path new-dirs != false
    [ set heading home-path ]
    [ set heading one-of new-dirs ]
  ]
end

to choose-heading  ;; Ghosts Procedure
  let dirs clear-headings
  let new-dirs remove opposite heading dirs
  let pacman-dir false

  if length dirs = 1
  [ set heading item 0 dirs ]
  if length dirs = 2
  [ ifelse see-pacman item 0 dirs
    [ set pacman-dir item 0 dirs ]
    [ ifelse see-pacman item 1 dirs
      [ set pacman-dir item 1 dirs ]
      [ set heading one-of new-dirs ]
    ]
  ]
  if length dirs = 3
  [ ifelse see-pacman item 0 dirs
    [ set pacman-dir item 0 dirs ]
    [ ifelse see-pacman item 1 dirs
      [ set pacman-dir item 1 dirs ]
      [ ifelse see-pacman item 2 dirs
        [ set pacman-dir item 2 dirs ]
        [ set heading one-of new-dirs ]
      ]
    ]
  ]
  if length dirs = 4
  [ ifelse see-pacman item 0 dirs
    [ set pacman-dir item 0 dirs ]
    [ ifelse see-pacman item 1 dirs
      [ set pacman-dir item 1 dirs ]
      [ ifelse see-pacman item 2 dirs
        [ set pacman-dir item 2 dirs ]
        [ ifelse see-pacman item 3 dirs
          [ set pacman-dir item 3 dirs ]
          [ set heading one-of new-dirs ]
        ]
      ]
    ]
  ]
  if pacman-dir != false
  [ ifelse scared = 0
    [ set heading pacman-dir ]
    [ set dirs remove pacman-dir dirs
      set heading one-of dirs
    ]
  ]
end

to-report clear-headings ;; ghosts procedure
  let dirs []
  if [pcolor] of patch-at 0 1 != blue
  [ set dirs lput 0 dirs ]
  if [pcolor] of patch-at 1 0 != blue
  [ set dirs lput 90 dirs ]
  if [pcolor] of patch-at 0 -1 != blue
  [ set dirs lput 180 dirs ]
  if [pcolor] of patch-at -1 0 != blue
  [ set dirs lput 270 dirs ]
  report dirs
end

to-report opposite [dir]
  ifelse dir < 180
  [ report dir + 180 ]
  [ report dir - 180 ]
end

to-report see-pacman [dir] ;; ghosts procedure
  let saw-pacman? false
  let p patch-here
  while [[pcolor] of p = black]
  [ ask p
    [ if any? pacmans-here
      [ set saw-pacman? true ]
      set p patch-at sin dir cos dir ;; next patch in direction dir
    ]
    ;; stop looking if you loop around the whole world
    if p = patch-here [ report saw-pacman? ]
  ]
  report saw-pacman?
end

to make-bonus ;; Observer Procedure
  ifelse next-bonus-in = 0
  [ set next-bonus-in 10 ]
  [ let bonus-patch one-of patches with [pellet-grid? and
                                                not any? bonuses-here and
                                                not any? pellets-here]
    if bonus-patch != nobody
    [ ask bonus-patch
      [ sprout-bonuses 1
        [ set shape "star"
          set heading 0
          set color one-of base-colors
          set value (random 10 + 1) * 100
          set countdown random 200 + 50 ] ]
      set next-bonus-in 5 + random 10 ] ]
end

;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Interface Procedures ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to move-up
  ask pacmans [ set new-heading 0 ]
end

to move-right
  ask pacmans [ set new-heading 90 ]
end

to move-down
  ask pacmans [ set new-heading 180 ]
end

to move-left
  ask pacmans [ set new-heading 270 ]
end


; Copyright 2001 Uri Wilensky.
; See Info tab for full copyright and license.
@#$#@#$#@
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@#$#@#$#@
## WHAT IS IT?

This is the classic arcade game, Pac-Man.  The game involves navigating Pac-Man through a maze.  Your objective is that Pac-Man eat all of the pellets (white circles), while avoiding the ghosts that pursue him.

If a ghost ever catches Pac-Man then Pac-Man is defeated.  If this occurs, the level will reset, but this will happen only if Pac-Man still has some lives remaining. (The pellets already collected on the level remain collected.)

However, when Pac-Man eats a Power-Pellet (large white circle) he can turn the tide, and the ghosts will turn scared and flee from him, for with the power of the Power-Pellet, Pac-Man can eat the ghosts!  Once a ghost is eaten it will return to its base, where it is born again, immune to the Power-Pellet until Pac-Man can find a new one to consume.  Pac-Man had better do just that, because unfortunately, the power of the Power-Pellet does not last forever, and will begin to wear off over time. (You will see the ghosts start to flash back to their normal appearance during the last few seconds of the Power-Pellet's effectiveness.)

Finally, occasionally a bonus (rotating star) will appear in the maze.  This bonus gives Pac-Man extra points if he eats it, but it will disappear if Pac-Man doesn't get it within a limited amount of time.

## HOW TO USE IT

Monitors
-- SCORE shows your current score.  You get points for collecting pellets, eating ghosts, and collecting bonuses.  You will get an extra life after every 35,000 points.
-- LEVEL shows your current level.  Each level has a different map, if you complete all the maps, it will loop back to the first map and continue.
-- LIVES shows how many extra lives you have remaining.  If you are defeated by a ghost when this is at 0, the game is over.

Sliders
-- DIFFICULTY controls the speed of the game.  Lower numbers make both the ghosts and Pac-Man move slowly, giving you more time to react as you play.

Buttons
-- NEW sets up a new game on level 1, with 3 lives, and a score of 0.
-- PLAY begins the game.  The game will pause after each level, so you will need to hit PLAY again after each level to continue.

Controls
-- UP, DOWN, LEFT, RIGHT control the direction Pac-Man moves.

## THINGS TO NOTICE

If you go off the edge of the maze you will wrap around to the other side.

Identifying Things in the Maze:
-- Yellow Circle with a mouth:  This is Pac-Man - you.
-- White Circles:
               These are Pellets - Collect all of these (including the Power-Pellets) to move on to the next level.

-- Large White Circles:
         These are Power-Pellets - They allow you to eat the Ghosts for a limited ammount of time.

-- Blue Squares:
                These are the walls of the maze - Neither Pac-Man nor the Ghosts can move through the walls.

-- Gray Squares:
                These are the Ghost Gates - Only Ghosts can move through them, and if they do so after having been eaten they will be healed.

-- Rotating Colored Stars:
      These are Bonus Stars - They give you extra points when you eat them.

-- Colorful Ghost with Eyes:
    These are the active Ghosts - Watch out for them!

-- Blue Ghost Shape:
            These are the scared Ghosts - Eat them for Extra Points!

-- Two Small Eyes:
              These are the Ghosts after they've been eaten - They will not affect you, and you can't eat them again, so just ignore them, but try not to be near its base when it gets back there.

Scoring System
-- Eat a Pellet:
       100 Points

-- Eat a Power-Pellet: 500 Points
-- Eat a Scared Ghost: 500 Points
-- Eat a Bonus Star:   100-1000 Points (varies)

## THINGS TO TRY

Beat your Highest Score.

Can you write an automated program for Pac-Man that will get him safely through the maze and collect all the pellets?

## EXTENDING THE MODEL

Think of other power-ups or bonuses that might be fun to have and make them appear randomly in the maze.

Add new enemies that behave differently from the ghosts.

## NETLOGO FEATURES

This model makes use of breeds, create-<breed>, every, and user-message.

The "import-world" command is used to read in the different maze configurations (levels).

## HOW TO CITE

If you mention this model or the NetLogo software in a publication, we ask that you include the citations below.

For the model itself:

* Wilensky, U. (2001).  NetLogo Pac-Man model.  http://ccl.northwestern.edu/netlogo/models/Pac-Man.  Center for Connected Learning and Computer-Based Modeling, Northwestern University, Evanston, IL.

Please cite the NetLogo software as:

* Wilensky, U. (1999). NetLogo. http://ccl.northwestern.edu/netlogo/. Center for Connected Learning and Computer-Based Modeling, Northwestern University, Evanston, IL.

## COPYRIGHT AND LICENSE

Copyright 2001 Uri Wilensky.

![CC BY-NC-SA 3.0](http://ccl.northwestern.edu/images/creativecommons/byncsa.png)

This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License.  To view a copy of this license, visit https://creativecommons.org/licenses/by-nc-sa/3.0/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.

Commercial licenses are also available. To inquire about commercial licenses, please contact Uri Wilensky at uri@northwestern.edu.

This model was created as part of the projects: PARTICIPATORY SIMULATIONS: NETWORK-BASED DESIGN FOR SYSTEMS LEARNING IN CLASSROOMS and/or INTEGRATED SIMULATION AND MODELING ENVIRONMENT. The project gratefully acknowledges the support of the National Science Foundation (REPP & ROLE programs) -- grant numbers REC #9814682 and REC-0126227.

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