PondTrade_step07_agent AI v1_links.nlogo

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; GNU GENERAL PUBLIC LICENSE ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;  The PondTrade model
;;  Copyright (C) 2018 Andreas Angourakis (andros.spica@gmail.com)
;;
;;  This program is free software: you can redistribute it and/or modify
;;  it under the terms of the GNU General Public License as published by
;;  the Free Software Foundation, either version 3 of the License, or
;;  (at your option) any later version.
;;
;;  This program is distributed in the hope that it will be useful,
;;  but WITHOUT ANY WARRANTY; without even the implied warranty of
;;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;  GNU General Public License for more details.
;;
;;  You should have received a copy of the GNU General Public License
;;  along with this program.  If not, see <http://www.gnu.org/licenses/>.

;;;;;;;;;;;;;;;;;
;;; BREEDS ;;;;;;
;;;;;;;;;;;;;;;;;

breed [ settlements settlement ]
breed [ ships ship ]
; agent types (breeds) are created with this structure: 'breed [ name-plural name-singular ]'

;;;;;;;;;;;;;;;;;
;;; VARIABLES ;;;
;;;;;;;;;;;;;;;;;

settlements-own [ sizeLevel ]

ships-own [ base route destination direction ]

patches-own [ isLand ]
; just like with patches, custom agent breeds can also have their specific variables

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; SETUP ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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to setup

  clear-all

  create-map

  create-coastal-settlements

  set-routes

  create-ships-per-settlement

  update-display

end

to create-map

  let centralPatch patch (min-pxcor + (floor world-width / 2)) (min-pycor + (floor world-height / 2))

  let halfSmallerDimension (world-width / 2)
  if (world-width > world-height) [ set halfSmallerDimension (world-height / 2) ]

  let minDistOfLandToCenter round ((pondSize / 100) * halfSmallerDimension)

  ask patches
  [

    let coastThreshold minDistOfLandToCenter ; defaults to the basic value

    ;; add noise to coast line
    ; set general noise range depending on UI's coastalNoiseLevel and the size of world
    let noiseRange (halfSmallerDimension * coastalNoiseLevel / 100)

    ; noiseType is specified with the chooser in the UI
    if (noiseType = "uniform")
    [
      ; adds a random amount from a uniform distribution with mean minDistOfLandToCenter
      set noiseRange (random-float noiseRange) - (noiseRange / 2)
      set coastThreshold minDistOfLandToCenter + noiseRange
    ]
    if (noiseType = "normal")
    [
      ; adds a random amount from a normal distribution with mean minDistOfLandToCenter
      set coastThreshold random-normal minDistOfLandToCenter (halfSmallerDimension * coastalNoiseLevel / 100)
    ]

    ifelse (distance centralPatch < coastThreshold)
    [
      set isLand false
    ]
    [
      set isLand true
    ]

  ]

  smooth-coast-line

  paint-patches

end

to smooth-coast-line

  ; smooth coast line
  repeat smoothIterations
  [
    ask patches
    [
      ifelse (isLand = false)
      [
        ; water patch
        ; consider ratios instead of absolute numbers to avoid having isolated water bodies adjacent to the world limits (less than 8 neighbors)
        if (count neighbors with [isLand = true] / count neighbors >= coastLineSmoothThreshold / 8)
        [
          ; water patch has a certain number of land neighbors
          set isLand true ; converted to land
        ]
      ]
      [
        ; land patch
        if (count neighbors with [isLand = false] / count neighbors >= coastLineSmoothThreshold / 8)
        [
          ; land patch has a certain number of water neighbors
          set isLand false ; converted to water
        ]
      ]
    ]
  ]

end

to paint-patches

  ask patches
  [
    ifelse (isLand = false)
    [ set pcolor 106 ] ; blue for water
    [ set pcolor 54 ] ; green for land
  ]

end

to create-coastal-settlements

  ; consider only coastal patches
  let coastalPatches patches with [(isLand = true) and (any? neighbors with [isLand = false])]

  repeat numberOfSettlements
  [
    ; ask a random coastal patch without a settlement already
    ask one-of coastalPatches with [not any? settlements-here]
    [
      sprout-settlements 1 ; creates one "turtle" of breed settlements
      [
        set sizeLevel 1 + random 10; sets a random arbitrary size level for the settlement (between 1 and 10)

        ; give meaningful display proportional to size
        set shape "circle 2"
        set size 1 + sizeLevel / 3
      ]
      ; exclude this patch from the pool of coastal patches
      set coastalPatches other coastalPatches
    ]
  ]

end

to create-ships-per-settlement

  ; For now, we create only one ship to better control its behaviour
  ask one-of settlements
  [
    let thisSettlement self

    hatch-ships 1
    [
      set base thisSettlement

      set shape "sailboat side" ; import this shape from the library (Tools > Shape editor > import from library)
      set color [color] of base
      set size 3
    ]
  ]

; the previous code for creating ships can be commented out
; by adding ';' at the beggining of each line, or
; by selecting several lines and either selecting 'Edit > Comment' or pressing 'ctrl + ;'.
;  ask settlements
;  [
;    let thisSettlement self ; to avoid the confusion of nested agent queries
;    hatch-ships round sizeLevel ; use the sizeLevel variable as the number of ships based in the settlement
;    [
;      set base thisSettlement
;
;      ; give meaningful display related to base
;      set shape "sailboat side" ; import this shape from the library (Tools > Shape editor > import from library)
;      set color [color] of base
;      set size 3
;
;      ; place it somewhere in the pond, randomly for now (if not, the command "hatch-breed" will place them in the same patch of the settlement)
;      move-to one-of patches with [isLand = false]
;    ]
;  ]

end

to set-routes

  ask settlements
  [
    let aSettlement self
    ask other settlements
    [
      create-link-to aSettlement [ set color yellow set hidden? true]
    ]
  ]

end

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;;; CYCLE ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to go

  ask ships
  [
    if (patch-here = [patch-here] of base) ; update the destination whenever in the base settlement
    [
      choose-destination
    ]
  ]

  ask ships
  [
    move-to-destination
  ]

end

to choose-destination ; ego = ship

  let thisShip self

  ; get routes connecting the base settlement
  let routesFromBase links with [end1 = [base] of thisShip]

  ; print the options available
  ask routesFromBase
  [
    print "==============================================================="
    print "route between:"
    print (word end1 end2)
    print "has the benefit-cost ratio of:"
    print benefit-cost-of-route
  ]
  print "-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x"

  ; select the one with higher benefit/cost ratio
  set route max-one-of routesFromBase [ benefit-cost-of-route ]

  ; get the settlement of destination
  set destination [end2] of route

  ; mark the most effective route
  ask route
  [
    set hidden? false
    ask other routesFromBase
    [
      set hidden? true
    ]
  ]

end

to move-to-destination ; ego = ship

  ifelse (patch-here = [patch-here] of destination) ; if the ship arrived at destination
  [
    face base
    set direction base
  ]
  [
    if (patch-here = [patch-here] of base) ; if the ship is at the base
    [
      face destination
      set direction destination
    ]
  ]
  ; else the ship is in route to either the base or the destination

  ; find how far is the ship from its current destination (direction)
  let currentDistance distance direction

  ; move through the route following direction, but not beyond the current destination
  forward min (list currentDistance 1)

end

to update-display

  ask settlements [ set hidden? not showSettlements ]

end

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Get and set routes (helper 'to-report' procedures) ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to-report get-routes-from-settlement [ aSettlement ] ; accepts a settlement and return a list of routes

  report [link-length] of links with [end1 = aSettlement]

end

to-report benefit-cost-of-route ; ego = link (route)

  ; takes the Euclidean distance between settlements as the proxy of the cost of a route
  let cost link-length

  ; the benefit is the multiplication of the sizeLevels of the two settlements
  let benefit ([sizeLevel] of end1) * ([sizeLevel] of end2)

  report benefit / cost

end
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After pressing 'Set up', decrease the run velocity and press 'Go' to observe the ship moving between settlements.\nLook at the terminal (bottom of the 'Interface' tab) to see the result of the code's 'print' statements.
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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 6.0.4
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