MIHS-18 P2 Max Fischel

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Default-person Max Fischel (Author)

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globals [ max-person  ]
breed [ person a-person ]
breed [ wolves wolf ]
turtles-own [ energy ]
patches-own [ countdown ]

to setup
  clear-all
  ifelse netlogo-web? [set max-person 10000] [set max-person 30000]


  ifelse model-version = "sheep-wolves-grass" [
    ask patches [
      set pcolor one-of [ green brown ]
      ifelse pcolor = green
        [ set countdown grass-regrowth-time ]
      [ set countdown random grass-regrowth-time ]
    ]
  ]
  [
    ask patches [ set pcolor blue ]
  ]

  create-person initial-number-sheep  ;
  [
    set shape  "person"
    set color yellow
    set size 1.65  ; easier to see
    set label-color blue - 2
    set energy random (2 * person-gain-from-food)
    setxy random-xcor random-ycor
  ]

  create-wolves initial-number-wolves
  [
    set shape "wolf"
    set color brown
    set size 1.88
    set energy random (2 * wolf-gain-from-food)
    setxy random-xcor random-ycor
  ]
  display-labels
  reset-ticks
end 

to go

  if not any? turtles [ stop ]

  if not any? wolves and count person > max-person [ user-message "The people have taken over the earth" stop ]
  ask person [
    move
    if model-version = "sheep-wolves-grass" [
      set energy energy - 1
      eat-grass
      death
    ]
    reproduce-person
  ]
  ask wolves [
    move
    set energy energy - 1
    eat-person
    death
    reproduce-wolves
  ]
  if model-version = "person-wolves-grass" [ ask patches [ grow-grass ] ]
  ;
  tick
  display-labels
end 

to move
  rt random 50
  lt random 50
  fd 1
end 

to eat-grass

  if pcolor = green [
    set pcolor brown
    set energy energy + person-gain-from-food
  ]
end 

to reproduce-person
  if random-float 100 < person-reproduce [
    set energy (energy / 2)
    hatch 1 [ rt random-float 360 fd 1 ]
  ]
end 

to reproduce-wolves
  if random-float 100 < wolf-reproduce [
    set energy (energy / 2)
    hatch 1 [ rt random-float 360 fd 1 ]
  ]
end 

to eat-person
  let prey one-of person-here
  if prey != nobody  [
    ask prey [ die ]
    set energy energy + wolf-gain-from-food
  ]
end 

to death

  if energy < 0 [ die ]
end 

to grow-grass

  if pcolor = brown [
    ifelse countdown <= 0
      [ set pcolor green
        set countdown grass-regrowth-time ]
      [ set countdown countdown - 1 ]
  ]
end 

to-report grass
  ifelse model-version = "person-wolves-grass" [
    report patches with [pcolor = green]
  ]
  [ report 0 ]
end 

to display-labels
  ask turtles [ set label "" ]
  if show-energy? [
    ask wolves [ set label round energy ]
    if model-version = "person-wolves-grass" [ ask person [ set label round energy ] ]
  ]
end 


; Copyright 1997 Uri Wilensky.
; See Info tab for full copyright and license.

There is only one version of this model, created 3 months ago by Max Fischel.

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