Sheep eat grass

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sigal samon (Author)

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Click to Run Model

to setup
  clear-all        
  setup-patches
  setup-turtles
  do-plots
end 

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

to setup-turtles
  create-turtles number
  ask turtles [ setxy random-xcor random-ycor ]
end 

turtles-own [energy]

to go
  if ticks >= 500 [ stop ]
  move-turtles
  eat-grass
  check-death
  reproduce
  regrow-grass
  tick
  do-plots
end 

to do-plots
  set-current-plot "Totals"
  set-current-plot-pen "turtles"
  plot count turtles
  set-current-plot-pen "grass"
  plot count patches with [pcolor = green]
end 

to move-turtles
  ask turtles [
    right random 360
    forward 1 set energy energy - 1

  ]
end 

to eat-grass
  ask turtles [
    if pcolor = green [
      set pcolor black
      set energy (energy + energy-from-grass)
    ]
    ifelse show-energy?
      [ set label energy ]
      [ set label "" ]
  ]
end 

to reproduce
  ask turtles [
    if energy > birth-energy [
      set energy energy - birth-energy
      hatch 1 [ set energy birth-energy ]
    ]
  ]
end 

to check-death
  ask turtles [
    if energy <= 0 [ die ]
  ]
end 

to regrow-grass
  ask patches [
    if random 100 < 3 [ set pcolor green ]
  ]
end

There is only one version of this model, created almost 14 years ago by sigal samon.

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