; We need to define some variables in our turtles and patches to record
; when they last ate (or were eaten)
turtles-own[
  last-eaten
]

patches-own[
  time-since-eaten
]

; Function to set up the model
to setup
  print "Setting up model."
  ;; (for this model to work with NetLogo's new plotting features,
  ;; __clear-all-and-reset-ticks should be replaced with clear-all at
  ;; the beginning of your setup procedure and reset-ticks at the end
  ;; of the procedure.)
  __clear-all-and-reset-ticks
  setup-patches
  setup-turtles
end

to setup-patches
  ask patches [ set pcolor green]
end 

to setup-turtles
  create-turtles initial-number-of-turtles[
    set shape "turtle"
    setxy (random 20) (random 20)
    set color white
    set last-eaten 2 ; Set the last-eaten variable to 2 initially
  ]
end

to go
  if not any? turtles [stop] ; Stop if all the turtles have died
  
  ask turtles[
    ; Move one step in a random direction
    rt random 360
    fd 1

    if time-since-eaten < 5[
      set last-eaten last-eaten - 1 
    ]
        
    if pcolor = green [
      set pcolor brown
      set last-eaten last-eaten + 2
      set time-since-eaten 0
    ]
    
    if time-since-eaten > 5 [
      set last-eaten last-eaten + 1
      set time-since-eaten 0
    ]
    
    if last-eaten <= 0[
      die
    ]    
  ]
  
  ask patches[
    if pcolor = brown[
      set time-since-eaten time-since-eaten + 1
 
      if time-since-eaten > 25[
        set pcolor green
      ]
      
    ]
  ]
  
  do-plots
  
  tick
end

;; draws the plot on screen when running as an experiment
to do-plots

  ;; set the current plot
  set-current-plot "Turtles Alive"
  
  ;; plot the ticks without pillar
  set-current-plot-pen "turtles-alive"
  plot count turtles
  
end
@#$#@#$#@
GRAPHICS-WINDOW
240
14
523
318
-1
-1
13.0
1
10
1
1
1
0
1
1
1
0
20
0
20
0
0
1
ticks
30.0

BUTTON
31
22
131
55
Setup Model
setup
NIL
1
T
OBSERVER
NIL
NIL
NIL
NIL
1

SLIDER
33
103
213
136
initial-number-of-turtles
initial-number-of-turtles
0
100
100
1
1
NIL
HORIZONTAL

BUTTON
32
62
121
95
Run Model
go
T
1
T
OBSERVER
NIL
NIL
NIL
NIL
1

PLOT
30
165
230
315
Turtles Alive
NIL
NIL
0.0
10.0
0.0
10.0
true
false
"" ""
PENS
"turtles-alive" 1.0 0 -2674135 true "" ""

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

This section could give a general understanding of what the model is trying to show or explain.

## HOW IT WORKS

This section could explain what rules the agents use to create the overall behavior of the model.

## HOW TO USE IT

This section could explain how to use the model, including a description of each of the items in the interface tab.

## THINGS TO NOTICE

This section could give some ideas of things for the user to notice while running the model.

## THINGS TO TRY

This section could give some ideas of things for the user to try to do (move sliders, switches, etc.) with the model.

## EXTENDING THE MODEL

This section could give some ideas of things to add or change in the procedures tab to make the model more complicated, detailed, accurate, etc.

## NETLOGO FEATURES

This section could point out any especially interesting or unusual features of NetLogo that the model makes use of, particularly in the Procedures tab.  It might also point out places where workarounds were needed because of missing features.

## RELATED MODELS

This section could give the names of models in the NetLogo Models Library or elsewhere which are of related interest.

## CREDITS AND REFERENCES

This section could contain a reference to the model's URL on the web if it has one, as well as any other necessary credits or references.
@#$#@#$#@
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flag
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Circle -7500403 true true 85 40 38
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leaf
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line
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line half
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pentagon
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person
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Polygon -7500403 true true 105 90 60 150 75 180 135 105

plant
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Polygon -7500403 true true 135 255 90 210 45 195 75 255 135 285
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Polygon -7500403 true true 135 180 90 135 45 120 75 180 135 210
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Polygon -7500403 true true 165 105 165 135 225 105 255 45 210 60
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sheep 2
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Polygon -7500403 true true 245 60 250 72 240 78 225 63 230 51
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square
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square 2
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triangle
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triangle 2
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turtle
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wheel
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x
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@#$#@#$#@
NetLogo 5.0.5
@#$#@#$#@
@#$#@#$#@
@#$#@#$#@
@#$#@#$#@
@#$#@#$#@
default
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@#$#@#$#@
0
@#$#@#$#@