locust_swarm_formation.nlogo

globals [
  CLOCK
  
  
  
  ]
turtles-own [
  flockmates
  nearest-neighbor
  contact
  TOCK
]
to SETUP
  ca
  crt POPULATION
  ask turtles [
    fd random 100
    set color green
    set heading random 360
    set size 1.5
  ]
  set CLOCK 0
  end

to GO
  ask turtles[
    right random 40
    left random 40
    if color != red [fd .2]  
    makecontact 
    ifelse color != red [fd .5] [flock fd locust-mobility]
   
  ]
  set CLOCK CLOCK + 1 
  wait .05
  plot (count turtles with [color = red])
  tick 
end

to makecontact
  let bug one-of turtles-on neighbors
    ifelse bug != nobody [set contact contact + 1] [set contact contact]
    ifelse (TOCK) < 50 [set TOCK TOCK + 1] [set TOCK 0] 
    if (TOCK) = 50 [set contact 0]
    if (contact) > 45 and (TOCK) < 50 [set color red]
    if (contact) = 0 and (color) != red [set color green] 
    
end  

to flock  ;; turtle procedure
  if color = red
  [find-flockmates
  if any? flockmates
    [ find-nearest-neighbor
      ifelse distance nearest-neighbor < minimum-separation
        [ separate ]
        [ align
          cohere ] ]]
  
end

to find-flockmates  ;; turtle procedure
  if color = red
  [set flockmates other turtles in-radius vision]
  
end

to find-nearest-neighbor ;; turtle procedure
  if color = red
  [set nearest-neighbor min-one-of flockmates [distance myself]]
 
end

;;; SEPARATE

to separate  ;; turtle procedure
  if color = red
  [turn-away ([heading] of nearest-neighbor) max-separate-turn]
  
end

;;; ALIGN

to align  ;; turtle procedure
  if color = red
  [turn-towards average-flockmate-heading max-align-turn]
  
end

to-report average-flockmate-heading  ;; turtle procedure
  ;; We can't just average the heading variables here.
  ;; For example, the average of 1 and 359 should be 0,
  ;; not 180.  So we have to use trigonometry.
  if color = red
  [let x-component sum [sin heading] of flockmates
  let y-component sum [cos heading] of flockmates
  ifelse x-component = 0 and y-component = 0
    [ report heading ]
    [ report atan x-component y-component ]]

end

;;; COHERE

to cohere  ;; turtle procedure
  if color = red
  [turn-towards average-heading-towards-flockmates max-cohere-turn]
  
end

to-report average-heading-towards-flockmates  ;; turtle procedure
  ;; "towards myself" gives us the heading from the other turtle
  ;; to me, but we want the heading from me to the other turtle,
  ;; so we add 180
  if color = red
  [let x-component mean [sin (towards myself + 180)] of flockmates
  let y-component mean [cos (towards myself + 180)] of flockmates
  ifelse x-component = 0 and y-component = 0
    [ report heading ]
    [ report atan x-component y-component ]]

end

;;; HELPER PROCEDURES

to turn-towards [new-heading max-turn]  ;; turtle procedure
  if color = red
  [turn-at-most (subtract-headings new-heading heading) max-turn]
  
end

to turn-away [new-heading max-turn]  ;; turtle procedure
  if color = red
  [turn-at-most (subtract-headings heading new-heading) max-turn]
  
end

;; turn right by "turn" degrees (or left if "turn" is negative),
;; but never turn more than "max-turn" degrees
to turn-at-most [turn max-turn]  ;; turtle procedure
  if color = red
  [ifelse abs turn > max-turn
    [ ifelse turn > 0
        [ rt max-turn ]
        [ lt max-turn ] ]
    [ rt turn ]]
  
end
@#$#@#$#@
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SLIDER
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NIL
CLOCK
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@#$#@#$#@
WHAT IS IT?
-----------
Model of locust swarm formation.


HOW IT WORKS
------------
Adjust the parameters to view how many members of the initial population develop into locusts over time.

HOW TO USE IT
-------------
Adjust the parameters to change the initial population, locust mobility and flocking parameters.


THINGS TO NOTICE
----------------
Population of locusts.


THINGS TO TRY
-------------
Adjust the parameters.  


EXTENDING THE MODEL
-------------------
It might be interesting to have the grasshoppers try and stay away from each other rather than wander randomly.



RELATED MODELS
--------------
This model makes heavy use of the "Flocking" model by Uri Wilensky.  The concept model is somewhat similar to the SIR model.


CREDITS AND REFERENCES
----------------------
Uri Wilensky - flocking model
Uri requested that the following copyright notice be included regarding his flocking model:

Copyright 1998 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 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.
This model was converted to NetLogo as part of the projects: PARTICIPATORY SIMULATIONS: NETWORK-BASED DESIGN FOR SYSTEMS LEARNING IN CLASSROOMS and/or INTEGRATED SIMULATION AND MODELING ENVIRONMENT. The project gratefully acknowledges the support of the National Science Foundation (REPP & ROLE programs) -- grant numbers REC #9814682 and REC-0126227. Converted from StarLogoT to NetLogo, 2002.
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