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locust_swarm_formation.nlogo
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locust_swarm_formation.nlogo
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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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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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