Andros-Spica_ABM-tutorial-koeln-2022/BlockC_module5_routes.nlogo
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; GNU GENERAL PUBLIC LICENSE ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;  module for calculating least cost path routes
;;  Koehl ABM tutorial version
;;  based on:
;;  Indus Village - Land model (flow accumulations) and The PondTrade model (routes)
;;  Copyright (C) 2022 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/>.

;; the gis extension allows us to read and operate standard GIS data
;; See documentation: https://ccl.northwestern.edu/netlogo/docs/gis.html
extensions [ gis ]

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

breed [ flowHolders flowHolder ]
breed [ sites site ]
breed [ settlements settlement ]

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

globals
[
  patchesWithElevationData
  noElevationDataTag
  maxElevation

  width
  height

  ;;; GIS data holders
  sitesData_EMIII-MMIA
  sitesData_MMIB
  elevationData
  riversData

  siteMarkerScale_min siteMarkerScale_max

  ;;; variables

  maxFlowAccumulation

  routes
]

sites-own
[
  ;;; from GIS data
  name
  siteType
  period
]

settlements-own
[
  sizeLevel
]

patches-own
[
  elevation ; elevation above sea level [m]

  flow_direction        ; the numeric code for the (main) direction of flow or
                        ; drainage within the land unit.
                        ; Following Jenson & Domingue (1988) convention:
                        ; NW = 64,   N = 128,        NE = 1,
                        ; W = 32,     <CENTRE>,   E = 2,
                        ; SW = 16,     S = 8,          SE = 4

  flow_receive          ; Boolean variable stating whether or not the land unit receives
                        ; the flow of a neighbour.

  flow_accumulation     ; the amount of flow units accumulated in the land unit.
                        ; A Flow unit is the volume of runoff water flowing from one land unit
                        ; to another (assumed constant and without losses).
  flow_accumulationState ; the state of the land unit regarding the calculation of flow
                        ; accumulation (auxiliary variable).

  isRiver

  pathCost

  ;;; path-finding related
  parent-patch ; patch's predecessor
  f ; the value of knowledge plus heuristic cost function f()
  g ; the value of knowledge cost function g()
  h ; the value of heuristic cost function h()
]

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; SETUP ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to setup

  reset-timer
  clear-all

  ; --- loading/testing parameters -----------

  import-map-with-flows ; import-world must be the first step

  ; --- core procedures ----------------------

  setup-patches

  setup-settlements

  ifelse (import-routes) [ import-routes-from-file ] [ set-routes export-routes-to-file ]

  ; --- display & output handling ------------------------

  setup-display

  output-print (word "Set up took " timer " seconds.")

end

to import-map-with-flows

  import-world "data/terrainWithFlows/BlockC_module2_flows world.csv"

  ;;; reduce patch size in pixels
  set-patch-size 3

end

to setup-patches

  assign-path-cost

end

to assign-path-cost

  ask patches with [elevation = noElevationDataTag] [ set pathCost 9999 ] ;;; this makes routes crossing patches with no elevation data extremely unlikely

  ask patchesWithElevationData
  [
    let myValidNeighborsAndI (patch-set self (neighbors with [elevation > noElevationDataTag]))

    ifelse (count myValidNeighborsAndI > 1)
    [
      set pathCost standard-deviation [elevation] of myValidNeighborsAndI
    ]
    [
      set pathCost 1
    ]
  ]

end

to setup-settlements

  ask sites with [period = simulation-period]
  [
    set shape "dot"
    set size 5

    hatch-settlements 1
    [
      set sizeLevel 1

      set shape "circle 2"
      set size 5
    ]
  ]

end

to set-routes

  set routes [] ; initialize/reset the routes as an empty list

  let settlementsWithoutRoutes settlements ; helper variable to keep track of which settlement already searched for routes

  ask settlements
  [
    let thisSettlement self

    ask other settlementsWithoutRoutes
    [
      let optimalRoute find-a-path ([patch-here] of thisSettlement) ([patch-here] of self) ; find the optimal route to this settlement
      set routes lput optimalRoute routes ; add the optimal route to the end of the routes list
    ]

    set settlementsWithoutRoutes other settlementsWithoutRoutes

  ]

end

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

to-report get-route [ settlement1 settlement2 ] ; accepts two settlements and returns a route

  ; get routes connecting settlement1
  let routesFromSettlement1 filter
  [ ?1 ->
    ([one-of settlements-here] of first ?1 = settlement1) or
    ([one-of settlements-here] of last ?1 = settlement1)
  ] routes

  ; get the route connecting settlement2 from the previous list
  let routeFromSettlement1ToSettlement2 filter
  [ ?1 ->
    ([one-of settlements-here] of first ?1 = settlement2) or
    ([one-of settlements-here] of last ?1 = settlement2)
  ] routesFromSettlement1

  report first routeFromSettlement1ToSettlement2

end

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

  report filter
  [ ?1 ->
    ([one-of settlements-here] of first ?1 = aSettlement) or
    ([one-of settlements-here] of last ?1 = aSettlement)
  ] routes

end

to-report get-origin-and-destination [ aRoute ] ; accepts a route and returns a turtle-set with two settlements

  report (turtle-set ([ one-of settlements-here ] of first aRoute) ([one-of settlements-here ] of last aRoute))

end


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; A* path finding algorithm ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; modified from Meghendra Singh's Astardemo1 model in NetLogo User Community Models
; http://ccl.northwestern.edu/netlogo/models/community/Astardemo1
; modified lines/fragments are marked with ";-------------------------------*"
; In this version, patches have different movement cost.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

; the actual implementation of the A* path finding algorithm
; it takes the source and destination patches as inputs
; and reports the optimal path if one exists between them as output
to-report find-a-path [ source-patch destination-patch]

  ; initialize all variables to default values
  let search-done? false
  let search-path []
  let current-patch 0
  let open [] ;-------------------------------*
  let closed [] ;-------------------------------*

  ;-------------------------------*
  ask patches with [ f != 0 ]
  [
    set f 0
    set h 0
    set g 0
  ]
  ;-------------------------------*

  ; add source patch in the open list
  set open lput source-patch open

  ; loop until we reach the destination or the open list becomes empty
  while [ search-done? != true]
  [
    ifelse length open != 0
    [
      ; sort the patches in open list in increasing order of their f() values
      set open sort-by [ [?1 ?2] -> [f] of ?1 < [f] of ?2 ] open

      ; take the first patch in the open list
      ; as the current patch (which is currently being explored (n))
      ; and remove it from the open list
      set current-patch item 0 open
      set open remove-item 0 open

      ; add the current patch to the closed list
      set closed lput current-patch closed

      ; explore the Von Neumann (left, right, top and bottom) neighbors of the current patch
      ask current-patch
      [
        ; if any of the neighbors is the destination stop the search process
        ifelse any? neighbors4 with [ (pxcor = [ pxcor ] of destination-patch) and (pycor = [pycor] of destination-patch)] ;-------------------------------*
        [
          set search-done? true
        ]
        [
          ; the neighbors should not already explored patches (part of the closed list)
          ask neighbors4 with [ (not member? self closed) and (self != parent-patch) ] ;-------------------------------*
          [
            ; the neighbors to be explored should also not be the source or
            ; destination patches or already a part of the open list (unexplored patches list)
            if not member? self open and self != source-patch and self != destination-patch
            [
;              set pcolor 45 ;-------------------------------*

              ; add the eligible patch to the open list
              set open lput self open

              ; update the path finding variables of the eligible patch
              set parent-patch current-patch
              set g [g] of parent-patch + pathCost ;-------------------------------*
              set h distance destination-patch
              set f (g + h)
            ]
          ]
        ]
;        if self != source-patch ;-------------------------------*
;        [
;          set pcolor 35
;        ]
      ]
    ]
    [
      ; if a path is not found (search is incomplete) and the open list is exhausted
      ; display a user message and report an empty search path list.
      user-message( "A path from the source to the destination does not exist." )
      report []
    ]
  ]

  ; if a path is found (search completed) add the current patch
  ; (node adjacent to the destination) to the search path.
  set search-path lput current-patch search-path

  ; trace the search path from the current patch
  ; all the way to the source patch using the parent patch
  ; variable which was set during the search for every patch that was explored
  let temp first search-path
  while [ temp != source-patch ]
  [
;    ask temp ;-------------------------------*
;    [
;      set pcolor 85
;    ]
    set search-path lput [parent-patch] of temp search-path
    set temp [parent-patch] of temp
  ]

  ; add the destination patch to the front of the search path
  set search-path fput destination-patch search-path

  ; reverse the search path so that it starts from a patch adjacent to the
  ; source patch and ends at the destination patch
  set search-path reverse search-path

  print (word "Route between " source-patch " and " destination-patch " done.")

  ; report the search path
  report search-path

end


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;; DISPLAY AND PLOT ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to setup-display

  paint-routes

end

to paint-routes

  ;;; define list of shades of red in NetLogo
  let redShades (list 11 12 13 14 15 16 17 18 19)
  ;;; NOTE: this is needed because rgb colors based on elevation are a list
  ;;; while NetLogo color are numbers

  ; resets route patches to the terrain color
  foreach routes
  [ ?1 ->
    let aRoute ?1

    foreach aRoute
    [ ??1 ->
      ask ??1 [ display-elevation ]
    ]
  ]

  ; paint route patches in shades of red depending on route frequency
  foreach routes
  [ ?1 ->
    let aRoute ?1

    foreach aRoute
    [ ??1 ->
      ask ??1
      [
        if (showRoutes)
        [
          ifelse (not member? pcolor redShades) ; if its the first route crossing the patch
          [
            set pcolor 11
          ]
          [
            set pcolor min (list (pcolor + 1) (19)) ; sets a maximum at 19 (the brightest)
          ]
        ]
      ]
    ]
  ]

end

to display-elevation

  let elevationGradient 100 + (155 * (elevation / maxElevation))
  set pcolor rgb (elevationGradient - 100) elevationGradient 0

end

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;; DATA LOAD AND PREPARATION ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to export-routes-to-file

  ;;; build a unique file name to identify current setting
  let filePath (word "data/routes/routes_" simulation-period "_w=" world-width "_h=" world-height "_randomSeed=" randomSeed ".txt")

  file-open filePath

  foreach routes
  [
    aRoute ->

    file-print aRoute
  ]

  file-close

end

to import-routes-from-file

  ;;; get unique file name corresponding to the current setting
  let filePath (word "data/routes/routes_" simulation-period "_w=" world-width "_h=" world-height "_randomSeed=" randomSeed ".txt")

  ifelse (not file-exists? filePath)
  [ print (word "WARNING: could not find '" filePath "'") stop ] ;;; unfortunately the stop command doesn't stop the setup procedure
  [
    file-open filePath

    set routes []

    while [not file-at-end?]
    [
      let lineString file-read-line
      set lineString remove-item 0 lineString
      set lineString remove-item (length lineString - 1) lineString
      set lineString (word "(list " lineString " )")

      set routes lput (run-result lineString) routes
    ]
  ]

  file-close

end
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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

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(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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