Ants (Perspective Demo)

Ants (Perspective Demo) preview image

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Uri_dolphin3 Uri Wilensky (Author)

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Model group CCL | Visible to everyone | Changeable by group members (CCL)
Model was written in NetLogo 5.0.4 • Viewed 504 times • Downloaded 52 times • Run 2 times
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patches-own [
  chemical             ;; amount of chemical on this patch
  food                 ;; amount of food on this patch (0, 1, or 2)
  nest?                ;; true on nest patches, false elsewhere
  nest-scent           ;; number that is higher closer to the nest
  food-source-number   ;; number (1, 2, or 3) to identify the food sources
]

;;;;;;;;;;;;;;;;;;;;;;;;
;;; Setup procedures ;;;
;;;;;;;;;;;;;;;;;;;;;;;;

to setup
  clear-all
  set-default-shape turtles "bug"
  crt population
  [ set size 2         ;; easier to see
    set color red  ]   ;; red = not carrying food
  setup-patches
  reset-ticks
end 

to setup-patches
  ask patches
  [ setup-nest
    setup-food
    recolor-patch ]
end 

to setup-nest  ;; patch procedure
  ;; set nest? variable to true inside the nest, false elsewhere
  set nest? (distancexy 0 0) < 5
  ;; spread a nest-scent over the whole world -- stronger near the nest
  set nest-scent 200 - distancexy 0 0
end 

to setup-food  ;; patch procedure
  ;; setup food source one on the right
  if (distancexy (0.6 * max-pxcor) 0) < 5
  [ set food-source-number 1 ]
  ;; setup food source two on the lower-left
  if (distancexy (-0.6 * max-pxcor) (-0.6 * max-pycor)) < 5
  [ set food-source-number 2 ]
  ;; setup food source three on the upper-left
  if (distancexy (-0.8 * max-pxcor) (0.8 * max-pycor)) < 5
  [ set food-source-number 3 ]
  ;; set "food" at sources to either 1 or 2, randomly
  if food-source-number > 0
  [ set food one-of [1 2] ]
end 

to recolor-patch  ;; 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 ] ]
    ;; scale color to show chemical concentration
    [ set pcolor scale-color green chemical 0.1 5 ] ]
end 

;;;;;;;;;;;;;;;;;;;;;
;;; Go procedures ;;;
;;;;;;;;;;;;;;;;;;;;;

to go  ;; forever button
  ask turtles
  [ if who >= ticks [ stop ] ;; delay initial departure
    ifelse color = red
    [ look-for-food  ]       ;; not carrying food? look for it
    [ return-to-nest ]       ;; carrying food? take it back to nest
    wiggle
    fd 1 ]
  diffuse chemical (diffusion-rate / 100)
  ask patches
  [ set chemical chemical * (100 - evaporation-rate) / 100  ;; slowly evaporate chemical
    recolor-patch ]
  tick
end 

to return-to-nest  ;; turtle procedure
  ifelse nest?
  [ ;; drop food and head out again
    set color red
    rt 180 ]
  [ set chemical chemical + 60  ;; drop some chemical
    uphill-nest-scent ]         ;; head toward the greatest value of nest-scent
end 

to look-for-food  ;; turtle procedure
  if food > 0
  [ set color orange + 1     ;; pick up food
    set food food - 1        ;; and reduce the food source
    rt 180                   ;; and turn around
    stop ]
  ;; go in the direction where the chemical smell is strongest
  if (chemical >= 0.05) and (chemical < 2)
  [ uphill-chemical ]
end 

;; sniff left and right, and go where the strongest smell is

to uphill-chemical  ;; turtle procedure
  let scent-ahead chemical-scent-at-angle   0
  let scent-right chemical-scent-at-angle  45
  let scent-left  chemical-scent-at-angle -45
  if (scent-right > scent-ahead) or (scent-left > scent-ahead)
  [ ifelse scent-right > scent-left
    [ rt 45 ]
    [ lt 45 ] ]
end 

;; sniff left and right, and go where the strongest smell is

to uphill-nest-scent  ;; turtle procedure
  let scent-ahead nest-scent-at-angle   0
  let scent-right nest-scent-at-angle  45
  let scent-left  nest-scent-at-angle -45
  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
  lt random 40
  if not can-move? 1 [ rt 180 ]
end 

to-report nest-scent-at-angle [angle]
  let p patch-right-and-ahead angle 1
  if p = nobody [ report 0 ]
  report [nest-scent] of p
end 

to-report chemical-scent-at-angle [angle]
  let p patch-right-and-ahead angle 1
  if p = nobody [ report 0 ]
  report [chemical] of p
end 


; Copyright 1998 Uri Wilensky.
; See Info tab for full copyright and license.

There are 6 versions of this model.

Uploaded by When Description Download
Uri Wilensky almost 11 years ago Updated to NetLogo 5.0.4 Download this version
Uri Wilensky over 11 years ago Updated version tag Download this version
Uri Wilensky about 12 years ago Updated to NetLogo 5.0 Download this version
Uri Wilensky almost 14 years ago Updated from NetLogo 4.1 Download this version
Uri Wilensky almost 14 years ago Model from NetLogo distribution Download this version
Uri Wilensky almost 14 years ago Ants (Perspective Demo) Download this version

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