globals
[
  ;; lists used to create the various turtles
  shape-names        ;; list that holds the names of the non-sick shapes a student's turtle can have
  colors             ;; list that holds the colors used for students' turtles
  color-names        ;; list that holds the names of the colors used for students' turtles
  used-shape-colors  ;; list that holds the shape-color pairs that are already being used
  max-possible-codes ;; total number of possible unique shape/color combinations

  ;; when multiple runs are recorded in the plot, this
  ;; tracks what run number we're on
  run-number

  ;; keep track of where the show-sick slider was last time around
  old-show-sick?

  ;; quick start instructions variables
  quick-start  ;; current quickstart instruction displayed in the quickstart monitor
  qs-item      ;; index of the current quickstart instruction
  qs-items     ;; list of quickstart instructions
]

;; doctors cannot be infected but giving them an infected? variable makes code simpler
turtles-own
[
  infected?    ;; if a turtle is sick, infected? is true, otherwise, it is false
  base-shape   ;; original shape of a turtle
  step-size    ;; the amount that a turtle will go forward in the current direction
]

breed [ androids android ]  ;; created by the CREATE-ANDROIDS button, controlled by the simulation
breed [ students student ]  ;; created and controlled by the clients
breed [ doctors  doctor ]   ;; created by the CREATE-DOCTORS button, controlled by the simulation

students-own
[
  user-id  ;; unique id, input by the students when they log in, to identify each student turtle
]


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

to startup
  hubnet-reset
  setup-vars
  setup-plot
  setup-quick-start
end

to setup
  reset-ticks
  ask androids [ die ]
  ask doctors [ die ]

  cure-all
end

to cure-all
  ask turtles
  [
    set infected? false
    if breed = students
      [ update-sick?-monitor ]
    set shape base-shape
  ]

  ;; advance the run-number but don't clear the plot
  ;; so run results can be compared
  set run-number run-number + 1
  setup-plot
end

;; initialize global variables
to setup-vars
  set shape-names [ "box" "star" "wheel" "target" "cat" "dog"
                   "butterfly" "leaf" "car" "airplane"
                   "monster" "key" "cow skull" "ghost"
                   "cactus" "moon" "heart" ]

  ;; these colors were chosen with the goal of having colors
  ;; that are readily distinguishable from each other, and that
  ;; have names that everyone knows (e.g. no "cyan"!), and that
  ;; contrast sufficiently with the red infection dots and the
  ;; gray androids
  set colors      (list white brown green yellow
                        (violet + 1) (sky + 1))
  set color-names ["white" "brown" "green" "yellow"
                   "purple" "blue"]
  set max-possible-codes (length colors * length shape-names)
  set used-shape-colors []
  set-default-shape doctors "android"
  set run-number 1
end

;; create a temporary plot pen for the current run
;; cycle through a few colors so it is easy to
;; differentiate the runs.
to setup-plot
  create-temporary-plot-pen word "run " run-number
  set-plot-pen-color item (run-number mod 5)
                          [blue red green orange violet]
end

to make-androids
  create-androids num-androids
  [
    move-to one-of patches
    face one-of neighbors4
    set color gray
    set infected? false
    set base-shape "android"
    set shape base-shape
    set step-size 1
  ]
end

to make-doctors
  create-doctors num-doctors
  [
    setxy random-xcor random-ycor
    face one-of neighbors4
    set color white
    set infected? false
    set base-shape "android"
    set shape base-shape
    set step-size 1
  ]
end


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

to go
  ;; get commands and data from the clients
  listen-clients

  every 0.1
  [
    ;; allow the androids and doctors to wander around the view
    if wander?
      [ wander ]

    ask turtles with [ infected? ]
      [ spread-disease ]

    ask doctors [ heal ]

    tick
    plot count turtles with [ infected? ]
  ]
  ;; we don't want to reset the turtle shapes every time
  ;; through go but we do want to respond to the show-sick?
  ;; switch so keep track of when it's changed
  if show-sick? != old-show-sick?
  [
    ask turtles with [infected?] [ set-sick-shape ]
    set old-show-sick? show-sick?
  ]
end

;; controls the motion of the androids and doctors
to wander
  ;; doctors and androids may wander at different rates
  every android-delay
    [ breed-wander androids ]
  every doctor-delay
    [ breed-wander doctors ]
end

;; have breed-type (a turtle agentset) move around
to breed-wander [ breed-type ]
  ask breed-type
  [
    ;; always move in one of the cardinal directions
    face one-of neighbors4
    fd step-size
  ]
end

;; additional check infect called when student moves to new patch
;; added to avoid rewarding movement
to student-move-check-infect ;; turtle procedure
  if infected?
  [ spread-disease ]

  ask other turtles-here with [ infected? ]
  [ ask myself [ maybe-get-sick ] ]
end

;; spread disease to other turtles here
to spread-disease ;; turtle procedure
  ask other turtles-here with [ breed != doctors ] [ maybe-get-sick ]
end

;; roll the dice and maybe get sick
to maybe-get-sick ;; turtle procedure
  if not infected? [
    if ((random 100) + 1) <= infection-chance
    [ get-sick ] ]
end

;; set the appropriate variables to make this turtle sick
to get-sick ;; turtle procedure
  set infected? true
  set-sick-shape
  if (breed = students)
  [ update-sick?-monitor ]
end

;; change the shape of turtles to its sick shape
;; if show-ill? is true and change the shape to the base-shape if
;; show-ill? is false
to set-sick-shape ;; turtle procedure
  ifelse show-sick?
  [
    ;; we want to check if the turtles shape is already a sick shape
    ;; to prevent flickering in the turtles
    if ( shape != word base-shape " sick" )
    [ set shape word base-shape " sick" ]
  ]
  [
    ;; we want to check if the turtles shape is already a base-shape
    ;; to prevent flickering in the turtles
    if (shape != base-shape)
    [ set shape base-shape ]
  ]
end

;; infected turtles check if they are on the same patch as a doctor.
;; if they are, then they become healthy.
to heal ;; turtle procedure
  ask turtles-here with [ infected? ]
    [
      set infected? false
      set shape base-shape
    ]
end

;; causes the initial infection in the turtle population --
;; infects a random healthy turtle until the desired number of
;; turtles are infected
to infect-turtles
  let healthy-turtles turtles with [ not infected? and breed != doctors ]

  ifelse count healthy-turtles < initial-number-sick
  [
    ask healthy-turtles
    [
      get-sick
      set-sick-shape
    ]
    user-message "There are no more healthy turtles to infect.  Infection stopped."
    stop
  ]
  [
    ask n-of initial-number-sick healthy-turtles
    [
      get-sick
      set-sick-shape
    ]
  ]
end

;;;;;;;;;;;;;;;;;;;;;;;
;; HubNet Procedures ;;
;;;;;;;;;;;;;;;;;;;;;;;

;; determines which client sent a command, and what the command was
to listen-clients
  while [ hubnet-message-waiting? ]
  [
    hubnet-fetch-message
    ifelse hubnet-enter-message?
    [ create-new-student ]
    [
      ifelse hubnet-exit-message?
      [ remove-student ]
      [ execute-command hubnet-message-tag ]
    ]
  ]

  ask students
    [ update-sick?-monitor ]
end

;; NetLogo knows what each student turtle is supposed to be
;; doing based on the tag sent by the node:
;; step-size - set the turtle's step-size
;; Up    - make the turtle move up by step-size
;; Down  - make the turtle move down by step-size
;; Right - make the turtle move right by step-size
;; Left  - make the turtle move left by step-size
;; Get a Different Turtle - change the turtle's shape and color
to execute-command [command]
  if command = "step-size"
  [
    ask students with [user-id = hubnet-message-source]
    [ set step-size hubnet-message ]
    stop
  ]
  if command = "Up"
  [ execute-move 0 stop ]
  if command = "Down"
  [ execute-move 180 stop ]
  if command = "Right"
  [ execute-move 90 stop ]
  if command = "Left"
  [ execute-move 270 stop ]
  if command = "Change Appearance"
  [ execute-change-turtle stop ]
end

;; Create a turtle, set its shape, color, and position
;; and tell the node what its turtle looks like and where it is
to create-new-student
  create-students 1
  [
    setup-student-vars
    send-info-to-clients
  ]
end

;; sets the turtle variables to appropriate initial values
to setup-student-vars  ;; turtle procedure
  set user-id hubnet-message-source
  set-unique-shape-and-color
  move-to one-of patches
  face one-of neighbors4
  set infected? false
  set step-size 1
end

;; pick a base-shape and color for the turtle
to set-unique-shape-and-color ;; turtle procedure
  let code random max-possible-codes
  while [member? code used-shape-colors and count students < max-possible-codes]
  [
    set code random max-possible-codes
  ]
  set used-shape-colors (lput code used-shape-colors)
  set base-shape item (code mod length shape-names) shape-names
  set shape base-shape
  set color item (code / length shape-names) colors
end

;; report the string version of the turtle's color
to-report color-string [color-value]
  report item (position color-value colors) color-names
end

to update-sick?-monitor ;; turtle procedure
  hubnet-send user-id "Sick?" infected?
end

;; sends the appropriate monitor information back to the client
to send-info-to-clients ;; turtle procedure
  hubnet-send user-id "You are a:" (word (color-string color) " " base-shape)
  hubnet-send user-id "Located at:" (word "(" pxcor "," pycor ")")
  update-sick?-monitor
end

;; Kill the turtle, and remove it's shape-color combo from the used list
to remove-student
  ask students with [user-id = hubnet-message-source]
  [
    set used-shape-colors remove my-code used-shape-colors
    die
  ]
end

;; translates a student turtle's shape and color into a code
to-report my-code
  report (position base-shape shape-names) + (length shape-names) * (position color colors)
end

;; Cause the students to move forward step-size in new-heading's heading
to execute-move [new-heading]
  ask students with [user-id = hubnet-message-source]
  [
    set heading new-heading
    fd step-size
    hubnet-send user-id "Located at:" (word "(" pxcor "," pycor ")")

    ;; maybe infect or get infected by turtles on the patch student moved to
    student-move-check-infect
  ]
end

to execute-change-turtle
  ask students with [user-id = hubnet-message-source]
  [
    set used-shape-colors remove my-code used-shape-colors
    show-turtle
    set-unique-shape-and-color
    hubnet-send user-id "You are a:" (word (color-string color) " " base-shape)
    if infected?
    [ set-sick-shape ]
  ]
end

;;; this procedure is handy for testing out additional shapes and colors;
;;; you can call it from the Command Center
to show-gamut
  ca
  setup-vars
  crt max-possible-codes [
    fd max-pxcor * 0.7
    if who mod 3 = 0
      [ fd max-pxcor * 0.3 ]
    if who mod 3 = 1
      [ fd max-pxcor * 0.15 ]
    set heading 0
    set-unique-shape-and-color
  ]
  ask patch 0 0 [
    ask patches in-radius 2 [
      sprout-androids 1 [
        set shape "android"
        set color gray
      ]
    ]
  ]
  user-message (word length shape-names
              " shapes * "
              length colors
              " colors = "
              max-possible-codes
              " combinations")
end

;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Quick Start Procedures
;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; instructions to quickly setup the model, and clients to run this activity
to setup-quick-start
  set qs-item 0
  set qs-items
  [
    "Teacher: Follow these directions to run the HubNet activity."
    "Optional: Zoom In (see Tools in the Menu Bar)"
    "Optional: Change any of the settings."
    "Optional: Add androids and doctors."
    "Press the GO button."
    "Everyone: Open up a HubNet Client on your machine and type your user name..."
    "select this activity and press ENTER."
    "Teacher: Have the students move their turtles around..."
    "...to acquaint themselves with the interface."
    "Press the INFECT button in the NetLogo interface to start the simulation."
    "Everyone: Watch the plot of the number infected."
    "Teacher: To start the activity again with the same group..."
    "stop the model by pressing the GO button, if it is on."
    "Change any of the settings that you would like."
    "Press the SETUP button or the CURE-ALL button..."
    "SETUP will kill the androids and doctors, CURE-ALL will not."
    "Teacher: Restart the simulation by pressing the GO button again."
    "Infect some turtles and continue."
    "Teacher: To start the simulation over with a new group,"
    "have all the students log out "
    "...or kick out the clients from the HubNet Control Center."
    "Stop the model by pressing the GO button,"
    "press SETUP and follow these instructions again from the beginning."
  ]
  set quick-start (item qs-item qs-items)
end

;; view the next item in the quickstart monitor
to view-next
  set qs-item qs-item + 1
  if qs-item >= length qs-items
  [ set qs-item length qs-items - 1 ]
  set quick-start (item qs-item qs-items)
end

;; view the previous item in the quickstart monitor
to view-prev
  set qs-item qs-item - 1
  if qs-item < 0
  [ set qs-item 0 ]
  set quick-start (item qs-item qs-items)
end


; Copyright 2006 Uri Wilensky.
; See Info tab for full copyright and license.
@#$#@#$#@
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cure-all
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@#$#@#$#@
## WHAT IS IT?

This model is a modified version of the Disease activity which, simulates the spread of a disease through a population.  In this version the population can consist of students, which are turtles controlled by individual students via the HubNet Client, androids, infectable turtles controlled by the computer and doctors, un-infectable turtles that can heal other turtles.  Doctors do not exist in the Disease activity.

For further documentation on the original Disease activity, see the Participatory Simulations Guide found at http://ccl.northwestern.edu/ps/

## HOW IT WORKS

Turtles move around, possibly catching an infection, either randomly in the case of androids and doctors or as controlled by HubNet clients.  Healthy turtles on the same patch as sick turtles have an INFECTION-CHANCE chance also becoming sick.  A plot shows the number of sick turtles at each time tick, and if SHOW-SICK? is on, sick turtles have a red circle attached to their shape. Both students and androids can become sick, doctors cannot.  If an infectable turtle is on the same patch as a doctor they are cured.

Initially, all turtles are healthy.  A number of turtles equal to INITIAL-NUMBER-SICK become sick when the INFECT button is pressed.

## HOW TO USE IT

Quickstart Instructions:

Teacher: Follow these directions to run the HubNet activity.
Optional: Zoom In (see Tools in the Menu Bar)
Optional: Change any of the settings.
Optional: Add androids and doctors.

Everyone: Open up a HubNet Client on your machine and type your user name, select this activity and press ENTER.

Teacher: Have the students move their turtles around to acquaint themselves with the interface.  Press the INFECT button in the NetLogo interface to start the simulation.

Everyone: Watch the plot of the number infected.

Teacher: To start the activity again with the same group, stop the model by pressing the GO button, if it is on.  Change any of the settings that you would like.  Press the SETUP button or the CURE-ALL button, SETUP will kill the androids and doctors, CURE-ALL will not.

Teacher: Restart the simulation by pressing the GO button again.  Infect some turtles and continue.

Teacher: To start the simulation over with a new group stop the model by pressing the GO button, press the RESET button in the Control Center and follow these instructions again from the beginning.

Buttons:

SETUP - sets all students to an uninfected state, kills all androids, and increments the run-number so the data in the plot will overlay the previous run.
CURE-ALL - sets all turtles to an uninfected state and increments the run-number.
GO - runs the simulation
CREATE-ANDROIDS - adds NUM-ANDROIDS randomly moving turtles to the simulation
CREATE-DOCTORS - adds NUM-DOCTORS turtles that can heal other turtles
INFECT - infects INITIAL-NUMBER-SICK of the turtles in the simulation
NEXT >>> - shows the next quick start instruction
<<< PREVIOUS - shows the previous quick start instruction
RESET INSTRUCTIONS - shows the first quick start instruction

Sliders:

NUM-ANDROIDS - defines how many androids are created by the CREATE-ANDROIDS button
NUM-DOCTORS - defines how many doctors are created by the CREATE-DOCTORS button
ANDROID-DELAY - the delay time, in seconds, for android movement - the higher the number, the slower the androids move
DOCTOR-DELAY - the delay time, in seconds, for doctor movement - the higher the number, the slower the doctors move
INITIAL-NUMBER-SICK - the number of turtles that become infected spontaneously when the INFECT button is pressed
INFECTION-CHANCE - sets the percentage chance that every tenth of a second a healthy turtle will become sick if it is on the same patch as an infected turtle

Switches:

WANDER? - when on, the androids and doctors wander randomly.  When off, they do not move
SHOW-SICK? - when on, sick turtles add to their original shape a red circle.  When off, they can move through the population unnoticed

Monitors:

INFECTABLE TURTLES - the sum of students and androids since doctors cannot be infected.
NUMBER SICK - the number of turtles that are infected

Plots:

NUMBER SICK - shows the number of sick turtles versus time

Client Information

After logging in, the client interface will appear for the students, and if GO is pressed in NetLogo they will be assigned a turtle which will be described in the YOU ARE A: monitor.  Their current location will be shown in the LOCATED AT: monitor.  If the student doesn't like their assigned shape and/or color they can hit the CHANGE APPEARANCE button at any time to change to another random appearance.

The SICK? monitor will show "true" if your turtle is infected, or "false" will be shown if your turtle is not infected.

The student controls the movement of their turtle with the UP, DOWN, LEFT, and RIGHT buttons and the STEP-SIZE slider.  Clicking any of the directional buttons moves their turtle in the appropriate direction a distance of STEP-SIZE.

## THINGS TO NOTICE

If no doctors are present no matter how you change the various parameters, the same basic plot shape emerges.  After using the model once with the students, ask them how they think the plot will change if you alter a parameter and when you add doctors.  Altering the initial percentage sick and the infection chance will have different effects on the plot.

## THINGS TO TRY

Use the model with the entire class to serve as an introduction to the topic.  Then have students use the NetLogo model individually, in a computer lab, to explore the effects of the various parameters.  Discuss what they find, observe, and can conclude from this model.

Ask students to predict how the shape of the plot change will change when doctors are added.

## EXTENDING THE MODEL

Try to make the androids and doctors smarter about how they move around the world.

Experiment with different infection scenarios, for example once a turtle is cured it builds immunity to the disease or turtles may still carry the disease and infect others even after it has been cured.

## RELATED MODELS

Disease
Disease Solo


## 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. (2006).  NetLogo HubNet Disease Doctors model.  http://ccl.northwestern.edu/netlogo/models/HubNetDiseaseDoctors.  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 2006 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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Line -16777216 false 150 285 150 150
Line -16777216 false 150 150 30 90
Line -16777216 false 150 150 270 90
Circle -2674135 true false 170 178 108

butterfly
false
0
Rectangle -7500403 true true 92 135 207 224
Circle -7500403 true true 158 53 134
Circle -7500403 true true 165 180 90
Circle -7500403 true true 45 180 90
Circle -7500403 true true 8 53 134
Line -16777216 false 43 189 253 189
Rectangle -7500403 true true 135 60 165 285
Circle -7500403 true true 165 15 30
Circle -7500403 true true 105 15 30
Line -7500403 true 120 30 135 60
Line -7500403 true 165 60 180 30
Line -16777216 false 135 60 135 285
Line -16777216 false 165 285 165 60

butterfly sick
false
0
Rectangle -7500403 true true 92 135 207 224
Circle -7500403 true true 158 53 134
Circle -7500403 true true 165 180 90
Circle -7500403 true true 45 180 90
Circle -7500403 true true 8 53 134
Line -16777216 false 43 189 253 189
Rectangle -7500403 true true 135 60 165 285
Circle -7500403 true true 165 15 30
Circle -7500403 true true 105 15 30
Line -7500403 true 120 30 135 60
Line -7500403 true 165 60 180 30
Line -16777216 false 135 60 135 285
Line -16777216 false 165 285 165 60
Circle -2674135 true false 156 171 108

cactus
false
0
Rectangle -7500403 true true 135 30 175 177
Rectangle -7500403 true true 67 105 100 214
Rectangle -7500403 true true 217 89 251 167
Rectangle -7500403 true true 157 151 220 185
Rectangle -7500403 true true 94 189 148 233
Rectangle -7500403 true true 135 162 184 297
Circle -7500403 true true 219 76 28
Circle -7500403 true true 138 7 34
Circle -7500403 true true 67 93 30
Circle -7500403 true true 201 145 40
Circle -7500403 true true 69 193 40

cactus sick
false
0
Rectangle -7500403 true true 135 30 175 177
Rectangle -7500403 true true 67 105 100 214
Rectangle -7500403 true true 217 89 251 167
Rectangle -7500403 true true 157 151 220 185
Rectangle -7500403 true true 94 189 148 233
Rectangle -7500403 true true 135 162 184 297
Circle -7500403 true true 219 76 28
Circle -7500403 true true 138 7 34
Circle -7500403 true true 67 93 30
Circle -7500403 true true 201 145 40
Circle -7500403 true true 69 193 40
Circle -2674135 true false 156 171 108

car
false
0
Polygon -7500403 true true 300 180 279 164 261 144 240 135 226 132 213 106 203 84 185 63 159 50 135 50 75 60 0 150 0 165 0 225 300 225 300 180
Circle -16777216 true false 180 180 90
Circle -16777216 true false 30 180 90
Polygon -16777216 true false 162 80 132 78 134 135 209 135 194 105 189 96 180 89
Circle -7500403 true true 47 195 58
Circle -7500403 true true 195 195 58

car sick
false
0
Polygon -7500403 true true 285 208 285 178 279 164 261 144 240 135 226 132 213 106 199 84 171 68 149 68 129 68 75 75 15 150 15 165 15 225 285 225 283 174 283 176
Circle -16777216 true false 180 180 90
Circle -16777216 true false 30 180 90
Polygon -16777216 true false 195 90 135 90 135 135 210 135 195 105 165 90
Circle -7500403 true true 47 195 58
Circle -7500403 true true 195 195 58
Circle -2674135 true false 171 156 108

cat
false
0
Line -7500403 true 285 240 210 240
Line -7500403 true 195 300 165 255
Line -7500403 true 15 240 90 240
Line -7500403 true 285 285 195 240
Line -7500403 true 105 300 135 255
Line -16777216 false 150 270 150 285
Line -16777216 false 15 75 15 120
Polygon -7500403 true true 300 15 285 30 255 30 225 75 195 60 255 15
Polygon -7500403 true true 285 135 210 135 180 150 180 45 285 90
Polygon -7500403 true true 120 45 120 210 180 210 180 45
Polygon -7500403 true true 180 195 165 300 240 285 255 225 285 195
Polygon -7500403 true true 180 225 195 285 165 300 150 300 150 255 165 225
Polygon -7500403 true true 195 195 195 165 225 150 255 135 285 135 285 195
Polygon -7500403 true true 15 135 90 135 120 150 120 45 15 90
Polygon -7500403 true true 120 195 135 300 60 285 45 225 15 195
Polygon -7500403 true true 120 225 105 285 135 300 150 300 150 255 135 225
Polygon -7500403 true true 105 195 105 165 75 150 45 135 15 135 15 195
Polygon -7500403 true true 285 120 270 90 285 15 300 15
Line -7500403 true 15 285 105 240
Polygon -7500403 true true 15 120 30 90 15 15 0 15
Polygon -7500403 true true 0 15 15 30 45 30 75 75 105 60 45 15
Line -16777216 false 164 262 209 262
Line -16777216 false 223 231 208 261
Line -16777216 false 136 262 91 262
Line -16777216 false 77 231 92 261

cat sick
false
0
Line -7500403 true 285 240 210 240
Line -7500403 true 195 300 165 255
Line -7500403 true 15 240 90 240
Line -7500403 true 285 285 195 240
Line -7500403 true 105 300 135 255
Line -16777216 false 150 270 150 285
Line -16777216 false 15 75 15 120
Polygon -7500403 true true 300 15 285 30 255 30 225 75 195 60 255 15
Polygon -7500403 true true 285 135 210 135 180 150 180 45 285 90
Polygon -7500403 true true 120 45 120 210 180 210 180 45
Polygon -7500403 true true 180 195 165 300 240 285 255 225 285 195
Polygon -7500403 true true 180 225 195 285 165 300 150 300 150 255 165 225
Polygon -7500403 true true 195 195 195 165 225 150 255 135 285 135 285 195
Polygon -7500403 true true 15 135 90 135 120 150 120 45 15 90
Polygon -7500403 true true 120 195 135 300 60 285 45 225 15 195
Polygon -7500403 true true 120 225 105 285 135 300 150 300 150 255 135 225
Polygon -7500403 true true 105 195 105 165 75 150 45 135 15 135 15 195
Polygon -7500403 true true 285 120 270 90 285 15 300 15
Line -7500403 true 15 285 105 240
Polygon -7500403 true true 15 120 30 90 15 15 0 15
Polygon -7500403 true true 0 15 15 30 45 30 75 75 105 60 45 15
Line -16777216 false 164 262 209 262
Line -16777216 false 223 231 208 261
Line -16777216 false 136 262 91 262
Line -16777216 false 77 231 92 261
Circle -2674135 true false 186 186 108

cow skull
false
0
Polygon -7500403 true true 150 90 75 105 60 150 75 210 105 285 195 285 225 210 240 150 225 105
Polygon -16777216 true false 150 150 90 195 90 150
Polygon -16777216 true false 150 150 210 195 210 150
Polygon -16777216 true false 105 285 135 270 150 285 165 270 195 285
Polygon -7500403 true true 240 150 263 143 278 126 287 102 287 79 280 53 273 38 261 25 246 15 227 8 241 26 253 46 258 68 257 96 246 116 229 126
Polygon -7500403 true true 60 150 37 143 22 126 13 102 13 79 20 53 27 38 39 25 54 15 73 8 59 26 47 46 42 68 43 96 54 116 71 126

cow skull sick
false
0
Polygon -7500403 true true 150 90 75 105 60 150 75 210 105 285 195 285 225 210 240 150 225 105
Polygon -16777216 true false 150 150 90 195 90 150
Polygon -16777216 true false 150 150 210 195 210 150
Polygon -16777216 true false 105 285 135 270 150 285 165 270 195 285
Polygon -7500403 true true 240 150 263 143 278 126 287 102 287 79 280 53 273 38 261 25 246 15 227 8 241 26 253 46 258 68 257 96 246 116 229 126
Polygon -7500403 true true 60 150 37 143 22 126 13 102 13 79 20 53 27 38 39 25 54 15 73 8 59 26 47 46 42 68 43 96 54 116 71 126
Circle -2674135 true false 156 186 108

dog
false
0
Polygon -7500403 true true 300 165 300 195 270 210 183 204 180 240 165 270 165 300 120 300 0 240 45 165 75 90 75 45 105 15 135 45 165 45 180 15 225 15 255 30 225 30 210 60 225 90 225 105
Polygon -16777216 true false 0 240 120 300 165 300 165 285 120 285 10 221
Line -16777216 false 210 60 180 45
Line -16777216 false 90 45 90 90
Line -16777216 false 90 90 105 105
Line -16777216 false 105 105 135 60
Line -16777216 false 90 45 135 60
Line -16777216 false 135 60 135 45
Line -16777216 false 181 203 151 203
Line -16777216 false 150 201 105 171
Circle -16777216 true false 171 88 34
Circle -16777216 false false 261 162 30

dog sick
false
0
Polygon -7500403 true true 300 165 300 195 270 210 183 204 180 240 165 270 165 300 120 300 0 240 45 165 75 90 75 45 105 15 135 45 165 45 180 15 225 15 255 30 225 30 210 60 225 90 225 105
Polygon -16777216 true false 0 240 120 300 165 300 165 285 120 285 10 221
Line -16777216 false 210 60 180 45
Line -16777216 false 90 45 90 90
Line -16777216 false 90 90 105 105
Line -16777216 false 105 105 135 60
Line -16777216 false 90 45 135 60
Line -16777216 false 135 60 135 45
Line -16777216 false 181 203 151 203
Line -16777216 false 150 201 105 171
Circle -16777216 true false 171 88 34
Circle -16777216 false false 261 162 30
Circle -2674135 true false 126 186 108

ghost
false
0
Polygon -7500403 true true 30 165 13 164 -2 149 0 135 -2 119 0 105 15 75 30 75 58 104 43 119 43 134 58 134 73 134 88 104 73 44 78 14 103 -1 193 -1 223 29 208 89 208 119 238 134 253 119 240 105 238 89 240 75 255 60 270 60 283 74 300 90 298 104 298 119 300 135 285 135 285 150 268 164 238 179 208 164 208 194 238 209 253 224 268 239 268 269 238 299 178 299 148 284 103 269 58 284 43 299 58 269 103 254 148 254 193 254 163 239 118 209 88 179 73 179 58 164
Line -16777216 false 189 253 215 253
Circle -16777216 true false 102 30 30
Polygon -16777216 true false 165 105 135 105 120 120 105 105 135 75 165 75 195 105 180 120
Circle -16777216 true false 160 30 30

ghost sick
false
0
Polygon -7500403 true true 30 165 13 164 -2 149 0 135 -2 119 0 105 15 75 30 75 58 104 43 119 43 134 58 134 73 134 88 104 73 44 78 14 103 -1 193 -1 223 29 208 89 208 119 238 134 253 119 240 105 238 89 240 75 255 60 270 60 283 74 300 90 298 104 298 119 300 135 285 135 285 150 268 164 238 179 208 164 208 194 238 209 253 224 268 239 268 269 238 299 178 299 148 284 103 269 58 284 43 299 58 269 103 254 148 254 193 254 163 239 118 209 88 179 73 179 58 164
Line -16777216 false 189 253 215 253
Circle -16777216 true false 102 30 30
Polygon -16777216 true false 165 105 135 105 120 120 105 105 135 75 165 75 195 105 180 120
Circle -16777216 true false 160 30 30
Circle -2674135 true false 156 171 108

heart
false
0
Circle -7500403 true true 152 19 134
Polygon -7500403 true true 150 105 240 105 270 135 150 270
Polygon -7500403 true true 150 105 60 105 30 135 150 270
Line -7500403 true 150 270 150 135
Rectangle -7500403 true true 135 90 180 135
Circle -7500403 true true 14 19 134

heart sick
false
0
Circle -7500403 true true 152 19 134
Polygon -7500403 true true 150 105 240 105 270 135 150 270
Polygon -7500403 true true 150 105 60 105 30 135 150 270
Line -7500403 true 150 270 150 135
Rectangle -7500403 true true 135 90 180 135
Circle -7500403 true true 14 19 134
Circle -2674135 true false 171 156 108

key
false
0
Rectangle -7500403 true true 90 120 300 150
Rectangle -7500403 true true 270 135 300 195
Rectangle -7500403 true true 195 135 225 195
Circle -7500403 true true 0 60 150
Circle -16777216 true false 30 90 90

key sick
false
0
Rectangle -7500403 true true 90 120 300 150
Rectangle -7500403 true true 270 135 300 195
Rectangle -7500403 true true 195 135 225 195
Circle -7500403 true true 0 60 150
Circle -16777216 true false 30 90 90
Circle -2674135 true false 156 171 108

leaf
false
0
Polygon -7500403 true true 150 210 135 195 120 210 60 210 30 195 60 180 60 165 15 135 30 120 15 105 40 104 45 90 60 90 90 105 105 120 120 120 105 60 120 60 135 30 150 15 165 30 180 60 195 60 180 120 195 120 210 105 240 90 255 90 263 104 285 105 270 120 285 135 240 165 240 180 270 195 240 210 180 210 165 195
Polygon -7500403 true true 135 195 135 240 120 255 105 255 105 285 135 285 165 240 165 195

leaf sick
false
0
Polygon -7500403 true true 150 210 135 195 120 210 60 210 30 195 60 180 60 165 15 135 30 120 15 105 40 104 45 90 60 90 90 105 105 120 120 120 105 60 120 60 135 30 150 15 165 30 180 60 195 60 180 120 195 120 210 105 240 90 255 90 263 104 285 105 270 120 285 135 240 165 240 180 270 195 240 210 180 210 165 195
Polygon -7500403 true true 135 195 135 240 120 255 105 255 105 285 135 285 165 240 165 195
Circle -2674135 true false 141 171 108

monster
false
0
Polygon -7500403 true true 75 150 90 195 210 195 225 150 255 120 255 45 180 0 120 0 45 45 45 120
Circle -16777216 true false 165 60 60
Circle -16777216 true false 75 60 60
Polygon -7500403 true true 225 150 285 195 285 285 255 300 255 210 180 165
Polygon -7500403 true true 75 150 15 195 15 285 45 300 45 210 120 165
Polygon -7500403 true true 210 210 225 285 195 285 165 165
Polygon -7500403 true true 90 210 75 285 105 285 135 165
Rectangle -7500403 true true 135 165 165 270

monster sick
false
0
Polygon -7500403 true true 75 150 90 195 210 195 225 150 255 120 255 45 180 0 120 0 45 45 45 120
Circle -16777216 true false 165 60 60
Circle -16777216 true false 75 60 60
Polygon -7500403 true true 225 150 285 195 285 285 255 300 255 210 180 165
Polygon -7500403 true true 75 150 15 195 15 285 45 300 45 210 120 165
Polygon -7500403 true true 210 210 225 285 195 285 165 165
Polygon -7500403 true true 90 210 75 285 105 285 135 165
Rectangle -7500403 true true 135 165 165 270
Circle -2674135 true false 141 141 108

moon
false
0
Polygon -7500403 true true 175 7 83 36 25 108 27 186 79 250 134 271 205 274 281 239 207 233 152 216 113 185 104 132 110 77 132 51

moon sick
false
0
Polygon -7500403 true true 160 7 68 36 10 108 12 186 64 250 119 271 190 274 266 239 192 233 137 216 98 185 89 132 95 77 117 51
Circle -2674135 true false 171 171 108

star
false
0
Polygon -7500403 true true 151 1 185 108 298 108 207 175 242 282 151 216 59 282 94 175 3 108 116 108

star sick
false
0
Polygon -7500403 true true 151 1 185 108 298 108 207 175 242 282 151 216 59 282 94 175 3 108 116 108
Circle -2674135 true false 156 171 108

target
false
0
Circle -7500403 true true 0 0 300
Circle -16777216 true false 30 30 240
Circle -7500403 true true 60 60 180
Circle -16777216 true false 90 90 120
Circle -7500403 true true 120 120 60

target sick
true
0
Circle -7500403 true true 0 0 300
Circle -16777216 true false 30 30 240
Circle -7500403 true true 60 60 180
Circle -16777216 true false 90 90 120
Circle -7500403 true true 120 120 60
Circle -2674135 true false 163 163 95

wheel
false
0
Circle -7500403 true true 3 3 294
Circle -16777216 true false 30 30 240
Line -7500403 true 150 285 150 15
Line -7500403 true 15 150 285 150
Circle -7500403 true true 120 120 60
Line -7500403 true 216 40 79 269
Line -7500403 true 40 84 269 221
Line -7500403 true 40 216 269 79
Line -7500403 true 84 40 221 269

wheel sick
false
0
Circle -7500403 true true 3 3 294
Circle -16777216 true false 30 30 240
Line -7500403 true 150 285 150 15
Line -7500403 true 15 150 285 150
Circle -7500403 true true 120 120 60
Line -7500403 true 216 40 79 269
Line -7500403 true 40 84 269 221
Line -7500403 true 40 216 269 79
Line -7500403 true 84 40 221 269
Circle -2674135 true false 156 156 108

@#$#@#$#@
NetLogo 5.0beta1
@#$#@#$#@
@#$#@#$#@
@#$#@#$#@
@#$#@#$#@
VIEW
252
10
672
430
0
0
0
1
1
1
1
1
0
1
1
1
-10
10
-10
10

BUTTON
91
133
153
166
Up
NIL
NIL
1
T
OBSERVER
NIL
I

BUTTON
91
199
153
232
Down
NIL
NIL
1
T
OBSERVER
NIL
K

BUTTON
153
166
215
199
Right
NIL
NIL
1
T
OBSERVER
NIL
L

BUTTON
29
166
91
199
Left
NIL
NIL
1
T
OBSERVER
NIL
J

SLIDER
3
95
153
128
step-size
step-size
1
5
1
1
1
NIL
HORIZONTAL

MONITOR
156
10
243
59
Located at:
NIL
3
1

MONITOR
3
10
153
59
You are a:
NIL
3
1

MONITOR
156
79
243
128
Sick?
NIL
3
1

BUTTON
3
57
153
90
Change Appearance
NIL
NIL
1
T
OBSERVER
NIL
NIL

@#$#@#$#@
default
0.0
-0.2 0 0.0 1.0
0.0 1 1.0 0.0
0.2 0 0.0 1.0
link direction
true
0
Line -7500403 true 150 150 90 180
Line -7500403 true 150 150 210 180

@#$#@#$#@
0
@#$#@#$#@