globals [
  clock
  edge-patches  ;; used to prevent chemical from wrapping around edges of screen
]
turtles-own [
  carrying-food?
  drop-size     ;; how much chemical we're currently dropping
]
patches-own [
  chemical
  food
  nest?
  nest-scent
  food-source-number
]

;;;;;;;;;;;;;;;;;;;;;;;;
;;; nastavitve Procedures ;;;
;;;;;;;;;;;;;;;;;;;;;;;;

to nastavitve
  ca
  nastavitve-turtles
  nastavitve-patches
  set clock 0
  do-plotting
end

to nastavitve-turtles
  set-default-shape turtles "bug"
  cct mravlje [
    set size 2  ;; easier to see this way
    rt random-float 360
    set color red
    set carrying-food? false
  ]
end

to nastavitve-patches
  set edge-patches (patches with [abs pxcor = screen-edge-x or
                                  abs pycor = screen-edge-y])
  ask patches [
    set chemical 0
    set food 0
    set food-source-number -1
    nastavitve-nest
    nastavitve-food
    update-display
  ]
end

to nastavitve-nest  ;; patch procedure
  ;; set nest? variable to true inside the nest
  set nest? ((distancexy 0 0) < 5)
  ;; spread a nest-scent over the whole screen -- stronger near the nest
  set nest-scent (200 - (distancexy 0 0))
end

to nastavitve-food  ;; patch procedure
  ;; nastavitve food source one on the right of screen
  if ((distancexy (0.6 * screen-edge-x) 0) < 5)
  [ set food-source-number 1 ]

  ;; nastavitve food source two on the lower-left of screen
  if ((distancexy (-0.6 * screen-edge-x) (-0.6 * screen-edge-y)) < 5)
  [ set food-source-number 2 ]

  ;; nastavitve food source three on the upper-left of screen
  if ((distancexy (-0.8 * screen-edge-x) (0.8 * screen-edge-y)) < 5)
  [ set food-source-number 3 ]

  ;; set "food" at sources to either 1 or 2
  if (food-source-number > 0)
  [ set food (1 + random 2) ]
end

to update-display  ;; patch procedure
  ;; give color to nest and food sources
  ifelse nest?
  [ set pcolor violet ]
  [ ifelse (food > 0)
    [ if (food-source-number = 1) [ set pcolor cyan ]
      if (food-source-number = 2) [ set pcolor sky  ]
      if (food-source-number = 3) [ set pcolor blue ]
    ]
    [ set pcolor scale-color green chemical 0.1 5 ] ;; scale color to show chemical concentration
  ]
end

;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Runtime Procedures ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;

to izvajaj  ;; forever button
  ask turtles [ izvajaj-turtles ]
  diffuse chemical (delez-razprsitve / 100)
  ask edge-patches
    [ set chemical 0 ] ;; prevent wrapping around screen edges
  ask patches [ izvajaj-patches ]
  do-plotting
  set clock (clock + 1)
end

to izvajaj-turtles  ;; turtle procedure
  if (who < clock) ;; delay the initial departure of mravlje
  [ ifelse carrying-food?
    [set color orange + 1 return-to-nest ]  ;; if ant finds food, it returns to the nest
    [set color red    look-for-food  ]  ;; otherwise it keeps looking
  ]
end

to izvajaj-patches  ;; patch procedure
  set chemical (chemical * (100 - delez-izhlapevanja) / 100)  ;;slowly evaporate chemical
  update-display  ;; Refresh the Display
end

to return-to-nest  ;; turtle procedure
  ifelse nest?  ;; if ant is in the nest, it drops food and heads out again
  [ set carrying-food? false
    rt 180 fd 1
  ]
  [ set chemical (chemical + drop-size) ;; drop some chemical, but the amount decreases each time
    set drop-size (drop-size - 1.5)
    if (drop-size < 1) [set drop-size 1]
    uphill-nest-scent   ;; head toward the greatest value of nest-scent
    wiggle              ;; which is toward the nest
    fd 1]
end

to look-for-food  ;; turtle procedure
  if (food > 0)
  [ set carrying-food? true  ;; pick up food
    set food (food - 1)      ;; and reduce the food source
    set drop-size 60
    rt 180 stop         ;; and turn around
  ]
  flatten-world
  ifelse (chemical > 2)
  [ fd 1 ]
  [ ifelse (chemical < 0.05) ;; izvajaj in the direction where the chemical smell is strongest
    [ wiggle
      fd 1]
    [ uphill-chemical
      fd 1]
  ]
end

to uphill-chemical  ;; turtle procedure
  flatten-world
  wiggle
  ;; sniff left and right, and izvajaj where the strongest smell is
  let scent-ahead chemical-of patch-ahead 1
  let scent-right chemical-of patch-right-and-ahead 45 1
  let scent-left chemical-of patch-left-and-ahead 45 1
  if ((scent-right > scent-ahead) or (scent-left > scent-ahead))
    [ ifelse (scent-right > scent-left)
      [ rt 45 ]
      [ lt 45 ]
  ]
end

to uphill-nest-scent  ;; turtle procedure
  flatten-world
  ;; sniff left and right, and izvajaj where the strongest smell is
  let scent-ahead nest-scent-of patch-ahead 1
  let scent-right nest-scent-of patch-right-and-ahead 45 1
  let scent-left nest-scent-of patch-left-and-ahead 45 1
  if ((scent-right > scent-ahead) or (scent-left > scent-ahead))
  [ ifelse (scent-right > scent-left)
    [ rt 45 ]
    [ lt 45 ]
  ]
end

to wiggle  ;; turtle procedure
  rt random 40 - random 40
end

to flatten-world  ;; turtle procedure
  if (abs xcor > screen-edge-x - 1) [
    facexy-nowrap 0 ycor
  ]
  if (abs ycor > screen-edge-y - 1) [
    facexy-nowrap xcor 0
  ]
end

to do-plotting
  if not parcelo? [ stop ]
  set-current-plot "Food in each pile"
  set-current-plot-pen "food-in-pile1"
  plot count patches with [pcolor = cyan]
  set-current-plot-pen "food-in-pile2"
  plot count patches with [pcolor = sky]
  set-current-plot-pen "food-in-pile3"
  plot count patches with [pcolor = blue]
end


; *** NetLoizvajaj Model Copyright Notice ***
;
; This model was created as part of the project: CONNECTED MATHEMATICS:
; MAKING SENSE OF COMPLEX PHENOMENA THROUGH BUILDING OBJECT-BASED PARALLEL
; MODELS (OBPML).  The project gratefully acknowledges the support of the
; National Science Foundation (Applications of Advanced Technologies
; Program) -- grant numbers RED #9552950 and REC #9632612.
;
; Copyright 1998 by Uri Wilensky. All rights reserved.
;
; Permission to use, modify or redistribute this model is hereby granted,
; provided that both of the following requirements are followed:
; a) this copyright notice is included.
; b) this model will not be redistributed for profit without permission
;    from Uri Wilensky.
; Contact Uri Wilensky for appropriate licenses for redistribution for
; profit.
;
; This model was converted to NetLoizvajaj as part of the project:
; PARTICIPATORY SIMULATIONS: NETWORK-BASED DESIGN FOR SYSTEMS LEARNING IN
; CLASSROOMS.  The project gratefully acknowledges the support of the
; National Science Foundation (REPP program) -- grant number REC #9814682.
; Converted from StarLoizvajajT to NetLoizvajaj, 2001.  Updated 2002.
;
; To refer to this model in academic publications, please use:
; Wilensky, U. (1998).  NetLoizvajaj mravlje model.
; http://ccl.northwestern.edu/netloizvajaj/models/mravlje.
; Center for Connected Learning and Computer-Based Modeling,
; Northwestern University, Evanston, IL.
;
; In other publications, please use:
; Copyright 1998 by Uri Wilensky.  All rights reserved.  See
; http://ccl.northwestern.edu/netloizvajaj/models/mravlje
; for terms of use.
;
; *** End of NetLoizvajaj Model Copyright Notice ***
@#$#@#$#@
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@#$#@#$#@
KAJ JE TO?
------------
	V tej igri kolonija mravelj išče hrano. Vsaka mravlja sledi nizu enostavnih pravil, vendar pa kolonija kot celota deluje na prefinjen način.

	Ko mravlja najde košček hrane, ga nese nazaj v gnezdo, med gibanjem pa spušča kemikalijo. Ko ostale mravlje povohajo kemikalijo, sledijo kemikaliji proti hrani. Več mravelj nese hrano v gnezdo, bolj se okrepi kemična sled.

KAKO GA UPORABLJAMO?
-----------------

Pritisnite gumb NASTAVITVE, da pripravite mravljino gnezdo (v vijoličnem, na sredini) in 3 kupe hrane. Pritisnite gumb IZVAJAJ za začetek simulacije. Kemikalija je prikazana v gradientu od zelene do bele barve.




OPOMBE
----------------
Kolonija mravelj na splošno izkorišča vir hrane po nekem redu. Začne s hrano, ki je najbližja gnezdu, konča pa s hrano, ki je od gnezda najdlje oddaljena. Mravlje težje oblikujejo trdno pot do bolj oddaljene hrane, ker ima kemična sled več časa, da izhlapi in se razprši, še preden se le-ta okrepi.

Ko kolonija konča z zbiranjem najbližje hrane, kemična sled do te hrane seveda izgine, to pa osvobodi mravlje, da lahko zbirajo druge vire hrane. Bolj oddaljen vir hrane zahteva večjo "kritično številko" mravelj, ki morajo oblikovati trdno pot. 

Poraba vira hrane je prikazana na parceli. V CYAN vidite hrana1, ki je na desni strani. v BLUE vidite hrana2, ki je na spodnji levi strani zaslona. V MAGENTA vidite hrana3, ki je na zgornji levi strani zaslona.

RAZŠIRJANJE MODELA
-------------------
Poskusi različne postavitve za (iz)vire hrane. Kaj se zgodi, če sta dva vira hrane enako oddaljena od gnezda? Ko se to zgodi v resničnem življenju/svetu, kolonija mravelj ponavadi izrabi en vir, potem še drugega. (ne pa ob istem času)

Pri tem projektu mravlje uporabijo "zvijačo", da najdejo spet pot nazaj proti gnezdu: sledijo "vonju gnezda". Prave mravlje uporabljajo različne vrste pristopov, da najdejo njihovo pot nazaj k gnezdu. Poskusi uvesti nekaj alternativnih strategij.

NETLOGO ZNAČILNOSTI
-------------------
V postopku UPHILL-CHEMICAL, mravlje "sledijo gradientu" kemikalije. To pomeni, da če mravlja "voha" v tri smeri, se bo obrnila v tisto smer, kjer je kemikalija najmočnejša. Lahko poskusiš različne možnosti procesa UPHILL-CHEMICAL, tako da spreminjaš število in postavitev "mravljinih vdihov".

RETURN-TO-NEST uporablja podoben gradient.


ZASLUGE IN REFERENCE
-----------------------
Ta model je bil razvit pri MIT Media Lab. See Resnick, M. (1994) "Turtles, Termites and Traffic Jams: Explorations in Massively Parallel Microworlds." Cambridge, Ma: MIT Press. Prilagojeno za StarLogoT, 1997, kot del Connected Mathematics Project. Prilagojeno za NetLogo, 2000, kot del Participatory Simulations Project.

Pri sklicevanju na model v člankih uporabite: Wilensky, U. (1998).  NetLogo Ants model. http://ccl.northwestern.edu/netlogo/models/Ants. Center za povezano učenje in oblikovanje, ki temelji na računalniku, Northwestern University, Evanston, IL.

V ostalih objavah prosimo uporabite: Copyright 1998 by Uri Wilensky.  Vse pravice pridržane. Poglejte http://ccl.northwestern.edu/netlogo/models/Ants glede uporabljenih izrazov.
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@#$#@#$#@
NetLogo 3.0.2
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