turtles-own
  [ yawning?     ;; if true, the turtle is yawn-infectious
    stranger?    ;; if true, the turtle can't be infected by yawns
    yawn-count   ;; how long the turtle has been yawning
    age ]        ;; how old the turtle is

globals
[
  %family_friends ;; % of the population is infectious to yawning, socially close people
  %strangers      ;; % of the population is immune to yawning
  lifespan        ;; the average lifespan of a turtle
  average-offspring ;; average number of offspring a turtle could have
  carrying-capacity ;; number of turtles that can be in the world at one time
]


to setup
  clear-all
  setup-constants
  setup-turtles
  update-global-variables
  reset-ticks
end

;; variable number of 10 yawning turtles, distributed randomly
to setup-turtles
  set-default-shape turtles "person"
  crt people
    [ setxy random-xcor random-ycor
      set age random lifespan
      set yawn-count 0
      set stranger? false
      done-yawn ]
  ask n-of 10 turtles
    [ yawn ]
end

to yawn ;; turtle procedure
  set yawning? true
  set stranger? false
  set color red
end

to done-yawn ;; turtle procedure
  set yawning? false
  set stranger? false
  set yawn-count 0
  set color green
end

to become-stranger ;; turtle procedure
  set yawning? false
  set yawn-count 0
  set stranger? true
  set color gray
end

to setup-constants
  set lifespan 100
  set carrying-capacity 750
  set average-offspring 4
end

to go
  get-older
  move
  infect
  recover
  reproduce
  update-global-variables
  tick
end

to update-global-variables
  if count turtles > 0
  [
    set %family_friends (count turtles with [yawning?]) / (count turtles) * 100
    set %strangers (count turtles with [stranger?]) / (count turtles) * 100
  ]
end

;;Turtle counting variables are advanced.
to get-older
  ask turtles
  [
    set age age + 1
    if yawning?
      [ set yawn-count (yawn-count + 1) ]
    if age > lifespan
      [ die ]
  ]
end

;;Turtles move about at random.
to move
  ask turtles
  [ rt random 100
    lt random 100
    fd 1 ]
end

;; If a turtle yawns, it infects other turtles on the same patch.
;; turtles who are strangers don't yawn.
to infect
  ask turtles with [yawning?]
    [ ask other turtles-here with [ not stranger? ]
        [ if (random-float 100) < emotional_bonding
            [ yawn ] ] ]
end

;; once turtle has yawned, it stops yawning or becomes a stranger
to recover
   ask turtles with [yawning?]
     [ if (random yawn-count) > (lifespan * (0.2))  
         [ ifelse ((random-float 100) < 100 )        
             [ become-stranger ]
             [ done-yawn ] ] ]
end


to reproduce
  ask turtles with [not yawning?]
    [ if (count turtles) < carrying-capacity
         and (random lifespan) < average-offspring
       [ hatch 1
           [ set age 1
             lt 45 fd 1
             done-yawn ] ] ]
end
@#$#@#$#@
GRAPHICS-WINDOW
262
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727
496
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17
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1
10
1
1
1
0
1
1
1
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17
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17
1
1
1
ticks
30.0

SLIDER
31
104
225
137
emotional_bonding
emotional_bonding
0.0
99.0
21
1.0
1
%
HORIZONTAL

BUTTON
53
65
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100
NIL
setup
NIL
1
T
OBSERVER
NIL
NIL
NIL
NIL
1

BUTTON
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65
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go
T
1
T
OBSERVER
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NIL
1

PLOT
6
148
258
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Populations
weeks
people
0.0
52.0
0.0
200.0
true
true
"" ""
PENS
"yawning" 1.0 0 -2674135 true "" "plot count turtles with [ color = red ]"
"not yawning" 1.0 0 -10899396 true "" "plot count turtles with [ color = green ]"
"total" 1.0 0 -13345367 true "" "plot count turtles"

SLIDER
31
27
225
60
people
people
10
300
194
1
1
NIL
HORIZONTAL

MONITOR
46
317
155
362
NIL
%family_friends
1
1
11

MONITOR
122
317
203
362
NIL
%strangers
1
1
11

@#$#@#$#@
## WHAT IS IT?

This model demonstrates a world where people live to yawn all their lives. 

## HOW IT WORKS

The initial total population of this world can be controlled by the "people" slider. This affects how often people yawn as they come into contact with each other.

Everyone in the world will be moving randomly. There will be 3 states of which people could be in. Friends and family are green, strangers are grey and yawning people are red. Some people may go from friends to strangers. 

### Population turnover

When the agents die, some will be family, friends and strangers. The agents reproduced will replace those who die as family and friends or as strangers. The rate of reproduction is constant

### Degree of closeness

The degree of emotional closeness can be toggled in the emotional_closeness slider. This controls how many family and friends there are amongst the population of the world. As the agents come into contact, the degree of closeness comes into play, resulting in a state of yawning. Some friends become strangers to one another after a while. 


## HOW TO USE IT

The degree of emotional closeness can be toggled in the emotional_closeness slider. This controls how many family and friends there are amongst the population of the world. As the agents come into contact, the degree of closeness comes into play, resulting in a state of yawning. Some friends become strangers to one another after a while. 

The setup button resets everything in the population and randomly distributes people and 10 yawning people.

the go button starts the model simulation.

the monitors the percentage of who amongst the population knows each other, and who are strangers.

the plot graph shows the number of people who are yawning in red, not yawning in green, and the total population in blue.



@#$#@#$#@
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