;; We represent each card using two turtles, one for the front and one for the
;; back.  The card-back turtles are on top of the card-front turtles, covering
;; them up.  To reveal a card-front, we hide the card-back turtle on top of it.
breed [card-backs card-back]
breed [cards card]

;; Players are invisible turtles that we use to store information about
;; the participants in the game.
breed [players player]
players-own [
  user-name   ;; a string
  matches     ;; a number, how many successful matches so far
  attempts    ;; a number, how may total tries so far
]

globals [
  current-player  ;; holds a player turtle
]

;;
;; Setup Procedures
;;

to startup
  clear-all
  setup
  hubnet-reset
end

to setup
  ask patches [ set pcolor gray + 3 ]  ;; light gray
  deal
end

to deal
  ask cards [ die ]
  ask card-backs [ die ]
  ask players
  [
    set attempts 0
    set matches 0
  ]
  set current-player 0

  let card-shapes remove "default" shapes
  let y-max floor (pairs-in-deck * 2 / world-width)
  let x-max pairs-in-deck * 2 mod world-width
  let bounded-patches (patch-set patches with [pycor < y-max]
                                 patches with [pycor = y-max and pxcor < x-max])
  ask n-of pairs-in-deck bounded-patches
  [
    sprout-cards 1
    [
      set shape one-of card-shapes
      set card-shapes remove shape card-shapes
      set size 0.5
    ]
  ]
  ask cards
  [ hatch 1 [ move-to one-of bounded-patches with [not any? cards-here] ] ]
  ask cards
  [
    hatch-card-backs 1
    [
      set color white
      set size 0.8
    ]
    hide-turtle
  ]
  if any? players
  [ hubnet-broadcast "Whose turn?" [user-name] of item current-player sort players ]
  hubnet-broadcast "Your matches" 0
  hubnet-broadcast "Your turns" 0
  hubnet-broadcast "Success %" 0
  hubnet-broadcast "Cards remaining" 0
  hubnet-broadcast "Leader" ""
  hubnet-broadcast "Leader's matches" 0
end

;;
;; Runtime Procedures
;;

to go
  if not any? cards [
    __hubnet-broadcast-user-message winner-message
    user-message winner-message
    stop
  ]
  listen-clients
end

to-report winner-message
  let winners players with-max [matches]
  ifelse count winners > 1
  [ report (word "It's a " count winners "-way tie." ) ]
  [ report (word [user-name] of one-of winners " wins!") ]
end

;;
;; HubNet Procedures
;;

to listen-clients
  while [hubnet-message-waiting?]
  [
    hubnet-fetch-message
    ifelse hubnet-enter-message?
    [ add-player hubnet-message-source ][
      ifelse hubnet-exit-message?
      [ remove-player hubnet-message-source ]
      [
        let p item current-player sort players
        if hubnet-message-tag = "View" and [user-name] of p = hubnet-message-source
        [ ask p [ select-card first hubnet-message last hubnet-message ] ]
      ]
    ]
  ]
end

to add-player [name]
  create-players 1
  [
    hide-turtle
    set user-name name
    set matches 0
    set attempts 0
    hubnet-send user-name "Your name" user-name
    hubnet-send user-name "Whose turn?" [user-name] of item current-player sort players
    hubnet-send user-name "Your matches" matches
    hubnet-send user-name "Your turns" attempts
    hubnet-send user-name "Success %" 0
  ]
end

to remove-player [name]
  let p one-of players with [user-name = name]
  if p != nobody
  [
    ifelse position p sort players <= current-player
    [
      ask p [ die ]
      increment-current-player
    ]
    [ ask p [ die ] ]
  ]
end

to select-card [x y]
  if count cards with [not hidden?] < 2
  [
    let my-card one-of [cards-here] of patch x y
    if my-card != nobody
    [
      ask my-card [ show-turtle ]
      display
      let selected-cards cards with [not hidden?]
      if count selected-cards = 2
      [
        set attempts attempts + 1
        hubnet-send user-name "Your turns" attempts
        wait pair-up-delay
        ifelse 1 = length (remove-duplicates [shape] of selected-cards)
        [
          ask selected-cards [ ask card-backs-here [ die ] die ]
          set matches matches + 1
          hubnet-send user-name "Your matches" matches
          hubnet-broadcast "Cards remaining" count cards
          hubnet-broadcast "Leader" leader
          hubnet-broadcast "Leader's matches" max [matches] of players
        ]
        [
          ask selected-cards [ hide-turtle ]
          increment-current-player
        ]
        hubnet-send user-name "Success %" precision (matches / attempts) 3
        display
      ]
    ]
  ]
end

to increment-current-player
  ifelse count players = 0
  [ set current-player 0
    hubnet-broadcast "Whose turn?" "" ]
  [ set current-player (current-player + 1) mod count players
    hubnet-broadcast "Whose turn?" [user-name] of item current-player sort players ]
end

to-report leader
  let leaders players with-max [matches]
  ifelse any? leaders
  [
    ifelse count leaders = 1
    [ report [user-name] of one-of leaders ]
    [ report (word count leaders "-way tie") ]
  ]
  [ report "nobody" ]
end


; Copyright 2009 Uri Wilensky.
; See Info tab for full copyright and license.
@#$#@#$#@
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@#$#@#$#@
## WHAT IS IT?

This is a HubNet version of the classic card game Memory. The game tests players' short term memory of where they last saw an image appear. Players can test different mental strategies for remembering.

A deck of cards made up of card pairs of matching images are dealt face down. Each player takes turns flipping over two cards.  If they match, the player keeps the cards and goes again.  If the two cards don't match they are put face down again.

At first, the players have no information about the cards. The more cards that are turned over, the more information the players have -- if they can only remember it!

## HOW IT WORKS

Buttons:
SETUP initializes the world but does not remove any of the players
DEAL starts a new game
GO allows the players who have joined to play the game.  Each player plays the game in a sequential order, but all players can see the cards that other player flip over when they are face up.
SHOW-ALL-CARDS turns over all the cards so all the faces are revealed and all the matches are visible.
HIDE-ALL-CARDS turns all the cards face down so the matches are no longer visible.

Sliders:
PAIRS-IN-DECK determines how many shapes are used (up to 52, though you could add more if you were to resize the world and add more shapes).
PAIR-UP-DELAY indicates how long you want the turned over cards to display before hiding them again.

Monitors:
CARDS REMAINING - the number of cards that have not yet been matched.
CURRENT-PLAYER - the name of the player who is taking his or her turn.
NUMBER-OF-PLAYERS - the number of people currently logged in and playing the game.

## HOW TO USE IT

Press SETUP. Ask the players to login using the HubNet client.  When everyone has successfully logged in press the GO button.  The name of the current player will appear in the CURRENT-PLAYER monitor on the server and the WHOSE TURN monitor on the clients.  Only that client will be allowed to select two cards to turn over by clicking on them with the mouse.  If the cards match the cards will be removed and that player will receive a point and another turn, if not the CURRENT-PLAYER will be incremented to the next player. The game ends when all pairs of cards are matched and removed from the board.

## THINGS TO NOTICE

Try to remember where all the cards you see are located.  The game tests your ability to memorize where you last saw an image.

## THINGS TO TRY

Try different mental strategies for choosing cards and for remembering cards. You can't remember everything, so how will you choose which cards to remember?  How many can you remember perfectly?  How many can you remember well enough to at least make good guesses?

Adjust the PAIR-UP-DELAY to a higher number to give players a longer or shorter time to study where the flipped up cards are located.

Smaller decks are easier.  Adjust the PAIRS-IN-DECK slider to set the difficulty level.

The game is most fun if it's neither too easy nor too hard.  What's the best deck size for two players?  Three players?  Four players?  Etc.

## EXTENDING THE MODEL

Change the shapes used or add more using the Turtle Shapes Editor.

Change the number of cards in each set, have three or four cards of each shape.

## NETLOGO FEATURES

The use of invisible turtles to represent players is a little unusual.  The location of these turtles in the world is irrelevant; they are used just to store information.

We use the DISPLAY primitive to control what the players see when, and for how long.


## HOW TO CITE

If you mention this model in a publication, we ask that you include these citations for the model itself and for the NetLogo software:

* Wilensky, U. (2009).  NetLogo HubNet Memory HubNet model.  http://ccl.northwestern.edu/netlogo/models/HubNetMemoryHubNet.  Center for Connected Learning and Computer-Based Modeling, Northwestern University, Evanston, IL.
* 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 2009 Uri Wilensky.

![CC BY-NC-SA 3.0](http://i.creativecommons.org/l/by-nc-sa/3.0/88x31.png)

This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License.  To view a copy of this license, visit http://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.

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true
0
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Polygon -2674135 true false 135 285 105 135 105 105 120 45 135 15 150 0 165 15 180 45 195 105 195 135 165 285
Rectangle -13345367 true false 147 176 153 288
Polygon -13345367 true false 120 45 180 45 165 15 150 0 135 15
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Circle -5825686 true false 43 43 122
Polygon -5825686 true false 255 120 240 150 210 180 180 210 150 240 146 135
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false
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Polygon -1184463 true false 0 240 15 270 285 270 300 240 165 15 135 15
Polygon -16777216 true false 180 75 120 75 135 180 165 180
Circle -16777216 true false 129 204 42
Polygon -16777216 false false 0 240 15 270 285 270 300 240 165 15 135 15

44
false
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Polygon -7500403 true true 300 150 240 120 240 180
Polygon -7500403 true true 150 0 120 60 180 60
Polygon -7500403 true true 150 300 120 240 180 240
Polygon -7500403 true true 0 150 60 120 60 180
Polygon -7500403 true true 60 195 105 240 45 255
Polygon -7500403 true true 60 105 105 60 45 45
Polygon -7500403 true true 195 60 240 105 255 45
Polygon -7500403 true true 240 195 195 240 255 255

45
false
0
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false
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Polygon -955883 true false 33 58 0 150 30 240 105 285 135 285 150 270 165 285 195 285 255 255 300 150 268 62 226 43 194 36 148 32 105 35
Polygon -16777216 false false 108 40 75 57 42 101 32 177 79 253 124 285 133 285 147 268 122 222 103 176 107 131 122 86 140 52 154 42 193 66 204 101 216 158 212 209 188 256 164 278 163 283 196 285 234 255 257 199 268 137 251 84 229 52 191 41 163 38 151 41
Polygon -6459832 true false 133 50 171 50 167 32 155 15 146 2 117 10 126 23 130 33
Polygon -16777216 false false 117 10 127 26 129 35 132 49 170 49 168 32 154 14 145 1

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false
0
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Polygon -10899396 true false 150 240 240 270 150 135 60 270
Polygon -10899396 true false 150 75 75 210 150 195 225 210
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48
false
1
Polygon -7500403 true false 130 158 105 180 93 205 119 196 142 173
Polygon -16777216 true false 121 112 111 128 109 143 112 158 123 175 138 184 156 189 169 188 186 177 199 158 139 98
Circle -11221820 true false 126 86 90
Polygon -13345367 true false 159 103 152 114 151 125 152 135 158 144 169 150 182 151 194 149 207 142 238 111 191 72
Polygon -16777216 true false 187 56 177 72 175 87 178 102 189 119 204 128 222 133 235 132 252 121 265 102 205 42
Circle -11221820 true false 190 30 90

49
false
0
Polygon -7500403 true true 75 225 97 249 112 252 122 252 114 242 102 241 89 224 94 181 64 113 46 119 31 150 32 164 61 204 57 242 85 266 91 271 101 271 96 257 89 257 70 242
Polygon -7500403 true true 216 73 219 56 229 42 237 66 226 71
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Polygon -6459832 true false 252 143 242 141
Polygon -6459832 true false 254 136 232 137
Line -16777216 false 75 224 89 179
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Polygon -6459832 true false 262 138 234 149
Polygon -7500403 true true 50 121 36 119 24 123 14 128 6 143 8 165 8 181 7 197 4 233 23 201 28 184 30 169 28 153 48 145
Polygon -7500403 true true 171 181 178 263 187 277 197 273 202 267 187 260 186 236 194 167
Polygon -7500403 true true 187 163 195 240 214 260 222 256 222 248 212 245 205 230 205 155
Polygon -7500403 true true 223 75 226 58 245 44 244 68 233 73
Line -16777216 false 89 181 112 185
Line -16777216 false 31 150 47 118
Polygon -16777216 true false 235 90 250 91 255 99 248 98 244 92
Line -16777216 false 236 112 246 119
Polygon -16777216 true false 278 119 282 116 274 113
Line -16777216 false 189 201 203 161
Line -16777216 false 90 262 94 272
Line -16777216 false 110 246 119 252
Line -16777216 false 190 266 194 274
Line -16777216 false 218 251 219 257
Polygon -16777216 true false 230 67 228 54 222 62 224 72
Line -16777216 false 246 67 234 64
Line -16777216 false 229 45 235 68
Line -16777216 false 30 150 30 165

5
false
1
Circle -1184463 true false 30 30 240
Circle -7500403 false false 30 30 240
Polygon -16777216 true false 50 82 54 90 59 107 64 140 64 164 63 189 59 207 54 222 68 236 76 220 81 195 84 163 83 139 78 102 72 83 63 67
Polygon -16777216 true false 250 82 246 90 241 107 236 140 236 164 237 189 241 207 246 222 232 236 224 220 219 195 216 163 217 139 222 102 228 83 237 67
Polygon -1 true false 247 79 243 86 237 106 232 138 232 167 235 199 239 215 244 225 236 234 229 221 224 196 220 163 221 138 227 102 234 83 240 71
Polygon -1 true false 53 79 57 86 63 106 68 138 68 167 65 199 61 215 56 225 64 234 71 221 76 196 80 163 79 138 73 102 66 83 60 71

50
true
0
Polygon -7500403 true true 150 5 40 250 150 205 260 250

51
false
0
Circle -955883 true false 15 15 270
Circle -16777216 false false 22 21 256
Line -16777216 false 165 180 192 196
Line -16777216 false 42 140 83 140
Line -16777216 false 37 151 91 151
Line -16777216 false 218 167 265 167
Polygon -16777216 false false 148 265 75 229 86 207 113 191 120 175 109 162 109 136 86 124 137 96 176 93 210 108 222 125 203 157 204 174 190 191 232 230
Polygon -16777216 false false 212 142 182 128 154 132 140 152 149 162 144 182 167 204 187 206 193 193 190 189 202 174 193 158 202 175 204 158
Line -16777216 false 164 154 182 152
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Polygon -16777216 false false 60 75 75 90 90 75 105 75 90 45 105 45 120 60 135 60 135 45 120 45 105 45 135 30 165 30 195 45 210 60 225 75 240 75 225 75 210 90 225 75 225 60 210 60 195 75 210 60 195 45 180 45 180 60 180 45 165 60 150 60 150 45 165 45 150 45 150 30 135 30 120 60 105 75

52
true
0
Polygon -7500403 true true 165 210 165 225 135 255 105 270 90 270 75 255 75 240 90 210 120 195 135 165 165 135 165 105 150 75 150 60 135 60 120 45 120 30 135 15 150 15 180 30 180 45 195 45 210 60 225 105 225 135 210 150 210 165 195 195 180 210
Line -16777216 false 135 255 90 210
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Line -16777216 false 150 60 180 45
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Line -16777216 false 124 0 135 15

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false
0
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Polygon -7500403 true true 73 210 86 251 62 249 48 208
Polygon -7500403 true true 25 114 16 195 9 204 23 213 25 200 39 123

7
false
0
Polygon -13345367 true false 44 131 21 87 15 86 0 120 15 150 0 180 13 214 20 212 45 166
Polygon -13345367 true false 135 195 119 235 95 218 76 210 46 204 60 165
Polygon -13345367 true false 75 45 83 77 71 103 86 114 166 78 135 60
Polygon -7500403 true true 30 136 151 77 226 81 280 119 292 146 292 160 287 170 270 195 195 210 151 212 30 166
Circle -16777216 true false 215 106 30

8
false
0
Rectangle -7500403 true true 60 15 75 300
Polygon -7500403 true true 90 150 270 90 90 30
Line -7500403 true 75 135 90 135
Line -7500403 true 75 45 90 45

9
false
0
Polygon -10899396 true false 135 120 165 165 180 210 180 240 150 300 165 300 195 240 195 195 165 135
Circle -7500403 true true 85 132 38
Circle -7500403 true true 130 147 38
Circle -7500403 true true 192 85 38
Circle -7500403 true true 85 40 38
Circle -7500403 true true 177 40 38
Circle -7500403 true true 177 132 38
Circle -7500403 true true 70 85 38
Circle -7500403 true true 130 25 38
Circle -7500403 true true 96 51 108
Circle -16777216 true false 113 68 74
Polygon -10899396 true false 189 233 219 188 249 173 279 188 234 218
Polygon -10899396 true false 180 255 150 210 105 210 75 240 135 240

@#$#@#$#@
NetLogo 5.0beta1
@#$#@#$#@
@#$#@#$#@
@#$#@#$#@
@#$#@#$#@
MONITOR
133
15
240
64
Cards remaining
NIL
0
1

MONITOR
35
124
142
173
Your matches
NIL
0
1

MONITOR
143
149
249
198
Success %
NIL
1
1

MONITOR
25
15
132
64
Whose turn?
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3
1

MONITOR
15
241
140
290
Leader
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3
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MONITOR
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241
266
290
Leader's matches
NIL
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MONITOR
82
74
189
123
Your name
NIL
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1

MONITOR
35
174
142
223
Your turns
NIL
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1

VIEW
269
13
867
381
0
0
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1
1
1
1
1
0
1
1
1
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12
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@#$#@#$#@
default
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@#$#@#$#@
0
@#$#@#$#@