sheep_simulation.nlogo

breed [sheeps sheep]
sheeps-own [cal weight sex life offspring maturity]
patches-own [mass]
globals [hours-per-tick days-per-tick years-per-tick]

to setup-sheeps
  create-sheeps sheep-count [
    setxy random-xcor random-ycor
    set shape "sheep"
    set color white
    set size 2
    set cal calories-needed
    set weight (random(30) + 40)
    set life random-normal max-life 2
    ifelse random 2 = 1 [
      set color 19
      set maturity list (random-normal teenager 0.4) (random-normal adult 0.4)
      set offspring n-values ((random-normal max-hatchs 1) + 1) [(random-float max-life - 1) + 1]
    ] [
      set color 109
      set maturity list (random-normal teenager 0.4) (random-normal adult 0.4)
      set offspring []
    ]
  ]
end

to setup-patches
  ask patches [
    set mass (random(10) / 10) * max-mass
    update-patch-color
  ]
end

to setup-globals
  set hours-per-tick 1.0
  set days-per-tick hours-per-tick / 24
  set years-per-tick days-per-tick / 365
end

to setup
  clear-all
  reset-ticks
  setup-globals
  setup-sheeps
  setup-patches
end

to go
  ask patches [ update-mass update-patch-color ]
  ask sheeps [ eat move-sheeps weight-check update-life update-offspring update-maturity]
  ask patches [ update-patch-color ]
  tick
  check-time
  life-check
  end-check
end

to init-sheep
  set cal calories-needed
    set weight (random(30) + 40)
    set life random-normal max-life 2
  ifelse random 2 = 1 [
    set offspring n-values random-normal 3 1 [random-normal (life / 2) 2]
    set color 19
  ] [
    set color 109
    set offspring []
  ]
end

to update-maturity
  set maturity map [i -> i - years-per-tick] maturity
  check-teenager
  check-adult
end


to check-teenager
   if length maturity = 2 [
    let next min maturity
    if next <= 0 [
      set maturity remove next maturity
      ifelse length offspring != 0 [
        set color 17
      ] [
        set color 107
      ]
    ]
  ]
end

to check-adult
  if length maturity = 1 [
    let next min maturity
    if next <= 0 [
      set maturity remove next maturity
      ifelse length offspring != 0 [
        set color 15
      ] [
        set color 105
      ]
    ]
  ]
end

to update-offspring
  if length offspring != 0 [
  set offspring map [i -> i - years-per-tick] offspring
  let next min offspring
  if next <= 0 [
    set offspring remove next offspring
    hatch 1 [init-sheep]
  ]]
end

to update-life
  set life life - (1 / (365 * 24))
end

to life-check
  ask sheeps with [ life <= 0 ] [die]
end

to eat
  let gneeded? calories-needed / cal
  let gtoeat? gneeded? / 24
  let nocome? 0
  ask patch-here [
    ifelse mass <= 0 [
      set mass mass
      set nocome? 1
    ] [
      set mass mass - gtoeat?

    ]
  ]
  if nocome? = 0 [set cal cal - (calories-needed / 24)]
end

to update-mass
  set mass mass + (growth-rate / 24)
  if mass > max-mass [set mass max-mass]
end

to move-sheeps
  let no-mass? false
  ask patch-here [ if mass <= 0 [set no-mass? true] ]
  if no-mass? [ move ]
end

to move
  if random(10) < 2 [set heading heading + random(15) - 2]
  forward 1
end

to weight-check
  if weight < die-weight [die]
end

to end-check
  if count sheeps = 0 [stop]
end

to check-time
  if ticks mod 24 = 0 [new-day]
end

to new-day
  ask sheeps [
    if cal > 0 [set weight weight - (cal / 10)]
    if cal < 0 [set weight weight + (cal / 5)]
    set cal calories-needed
  ]
end

to update-patch-color
  set pcolor 51 + (8 * (max-mass - mass) / max-mass)
end
@#$#@#$#@
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"" ""
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@#$#@#$#@
## WHAT IS IT?

(a general understanding of what the model is trying to show or explain)

## HOW IT WORKS

(what rules the agents use to create the overall behavior of the model)

## HOW TO USE IT

(how to use the model, including a description of each of the items in the Interface tab)

## THINGS TO NOTICE

(suggested things for the user to notice while running the model)

## THINGS TO TRY

(suggested things for the user to try to do (move sliders, switches, etc.) with the model)

## EXTENDING THE MODEL

(suggested things to add or change in the Code tab to make the model more complicated, detailed, accurate, etc.)

## NETLOGO FEATURES

(interesting or unusual features of NetLogo that the model uses, particularly in the Code tab; or where workarounds were needed for missing features)

## RELATED MODELS

(models in the NetLogo Models Library and elsewhere which are of related interest)

## CREDITS AND REFERENCES

(a reference to the model's URL on the web if it has one, as well as any other necessary credits, citations, and links)
@#$#@#$#@
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@#$#@#$#@
NetLogo 6.0.2
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