.predatorPreySim_noEnvChange.tmp.nlogo

; EXTENSIONS
extensions [profiler]
; PROFILER - Exclusive time - is the time from when the procedure was entered, until it finished, but does not
; include any time spent in other user-defined procedures which it calls.
; PROFILER - Inclusive time - is the time from wheb the procedure was entered, until it finishes.

; GLOBAL VARIABLES
globals [
  ; Birth
  prey-death-count
  prey-birth-count
  ; Death
  predator-death-count
  predator-birth-count
  ; Sugar
  initial-sugar ; Starting amount of sugar patches
  sugar-regrowth-delay
]

; BREEDS
breed [ predators predator ]
breed [ preys prey ]

; SHARED PROPERTIES
patches-own [
  sugar ; Amount of sugar patches hold
  grow-back ; Re-grow sugar patches
  sugar-last-consumed ; Holds time when the patch was last consumed and can re-grow after some time
]

turtles-own [
  vision ; Using in-cone vision to see ahead
  energy ; How much sugar prey holds
  prey-energy-gained ; Used for debugging
]

; SETUP SUGAR
to setup-sugar
  if (random 100) < sugar-density [ ; Random sugar distribution
    set pcolor 47
    set sugar int (random 50 + 1) ; Starting amount of sugar
    set grow-back random 50 + 1 ; Random amount of sugar for re-growth
    set sugar-last-consumed 0
    ]
end

; SETUP BUTTON
to setup
  clear-all

  ask patches [
    setup-sugar
  ]
  ask patches with [ pcolor = black ] [
   set sugar 0 ; Starting black patches have 0 sugar = unusable
    ]

  ; Prey setup
  set-default-shape preys "circle" ; Shape of a prey
  create-preys initial-prey-number [ ; Set initial number of preys
    set color orange
    set size 1
    set vision 50
    set energy random 60 ; Starting amount of sugar
    setxy random-xcor random-ycor ; Spawn at random locations
  ]
  ; Predator setup
  set-default-shape predators "square" ; The shape of predators
  create-predators initial-predator-number [ ; Create predators, set initial number using a slider
    set color green
    set size 2.5
    set vision 70
    set energy random 60 ; Starting amount of energy
    setxy random-xcor random-ycor ; Spawn at random locations
  ]

  reset-ticks
end

; START THE SIMULATION
to go
  profiler:start ; Start profiler test - ENABLE/DISABLE WHEN NEEDED

  if not any? turtles [ stop ] ; Stop the simulation if no turtles are alive

  ask preys [
    move-prey
    eat-sugar-prey
    reproduce-prey
  ]
  ask predators [
    move-pred
    kill-prey
    reproduce-pred
  ]

  update-patches
  tick ; Increase the tick counter by 1 each time

  ; ENABLE/DISABLE PROFILER WHEN NEEDED
  profiler:stop ; End profiler test
  print profiler:report ; Show the results
  profiler:reset ; Reset profiler
end

; UPDATE PATCHES
to update-patches
  ask patches [ update-patch ]
end

to update-patch
  if sugar < 21 and sugar > 0 and ticks mod 5 = 0 and ticks >= sugar-last-consumed + 8 and (pcolor != blue - 1.5) [
    set sugar min (list 100 (sugar + grow-back)) ; Re-grow sugar patch
    set pcolor 47
  ]
end

; MOVE PREY
to move-prey
  let best-patch max-one-of patches in-cone vision 50 [ sugar ]; Find a patch with most sugar within radius
  if best-patch != nobody [ ; If the patch is found
    ifelse random 100 < 45 [  ; Random movement chance
      random-movement
    ] [
      face best-patch  ; Face the patch with most sugar
      fd 1 ; Move forward
      ]

      set energy energy - 4
      ; Uncomment line below if you want color to scale depending on how much energy left
       ;set color scale-color orange energy 200 0
      check-death
      ifelse sugar-count?
    [ set label energy ]
    [set label "" ]
      ]
end
; PREY EAT SUGAR
to eat-sugar-prey
  ask preys [
    if energy < maxEnergy [ ; If prey holds less sugar than maximum allowed
    if pcolor = 47 [
      set pcolor black
        let sugar-consumed min (list [sugar] of patch-here (maxEnergy - energy)) ; Calculate how much sugar was consumed
        set energy (energy + [sugar] of patch-here) ; Take sugar from patch and add it to prey
        ask patch-here [
          set sugar sugar - sugar-consumed ; Subtract the consumed amount of sugar from patch
          set sugar-last-consumed ticks ; Update timer
        ]
    ifelse sugar-count?
    [ set label energy ]
    [ set label "" ]
      ]
    ]
    if energy > maxEnergy [ set energy maxEnergy ] ; If the energy goes above maxEnergy, set it to maxEnergy
  ]
end
; PREY REPRODUCTION
to reproduce-prey
  ask preys [
  if energy > 89 and count preys < prey-carrying-capacity [  ; If collected sugar is above 89 and carrying capacity is not max
    set energy int (energy / 2) ; Divide the energy between parent and offspring
    set prey-birth-count (prey-birth-count + 1) ; Count how many are born
    hatch int (1) [ rt random-float 360 fd 1 ] ; Hatch an offspring and move it forward by 1 step
      ifelse sugar-count?
    [ set label energy ]
    [set label "" ]
    ]
  ]
end

; MOVE PREDATOR
to move-pred
      let prey-target one-of preys in-cone vision 70
  if prey-target != nobody [ ; If a prey is found within the vision cone
  ifelse random 100 < 45 [
    random-movement
    ] [
      fd 1 ; Move forward
      ]
      set energy energy - 2
      check-death
    ]
end
; KILL PREY
to kill-prey
    ask predators [
    let prey-target one-of preys-here
    if prey-target != nobody [
      let prey-energy [energy] of prey-target ; Get the energy of the prey
      ask prey-target [ die ] ; Kill the prey
      if energy < maxEnergy [
        set energy energy + prey-energy ; Collect energy from prey
        set prey-energy-gained prey-energy-gained + prey-energy
      ]
    ]
    if energy > maxEnergy [ set energy maxEnergy ]
  ]
end
; PREDATOR REPRODUCTION
to reproduce-pred
  if energy > 89 and count predators < predator-carrying-capacity [
 set energy int (energy / 2) ; Take half of the predators energy
 set predator-birth-count (predator-birth-count + 1)
 hatch int (1) [ ; Hatch an offspring and move it
   rt random-float 360
   fd 1
    ]
  ]
end

to-report total-prey-energy-gained
  report sum [ prey-energy-gained] of predators
end

; RANDOM MOVEMENT
to random-movement
  rt random 50 ; Right turn
  lt random 50 ; Left turn
  fd 1 ; Forward
  set energy energy - 2 ; Consume 2 sugar after move

  ; Uncomment line below if you want color to scale depending on how much energy left
  ;ask preys [
      ;set color scale-color orange energy 200 0 ; Set colour depending amount of energy a prey holds (brighter to darker)
  ;]
  ; Uncomment line below if you want color to scale depending on how much energy left
  ;ask predators [
    ;set color scale-color green energy 200 0
  ;]

      check-death
      ifelse sugar-count?
    [ set label energy ]
    [ set label "" ]
end

; CHECK DEATH
to check-death
  ask preys [
    if energy <= 0 [ ; If prey has no sugar left
   set prey-death-count (prey-death-count + 1) ; Increase death count
   die ; Remove the turtle
    ]
  ]
  ask predators [
    if energy <= 0 [
      set predator-death-count (predator-death-count + 1)
      die
    ]
  ]
end
@#$#@#$#@
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BUTTON
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PLOT
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MONITOR
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MONITOR
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Predator Deaths
predator-death-count
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MONITOR
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TEXTBOX
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Sugar
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MONITOR
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TEXTBOX
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<-DEBUG
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@#$#@#$#@
## WHAT IS IT?

A predator-prey simulation

## 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 6.4.0
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