breed [sugarmen sugarman]
breed [grassmen grassman]
breed [meatmen meatman]
globals [sugar-die grass-die meat-die px py]



                  
turtles-own [energy]  ;; for keeping track of when the turtle is ready to reproduce and when it will die 





to setup ;; setup procedure
  clear-all
  set-default-shape sugarmen "butterfly"
  set-default-shape grassmen "cow"
  set-default-shape meatmen "person"
  set sugar-die "0"
  set grass-die "0"
  set meat-die "0"
  setup-patches
  setup-breeds
  

end






to setup-patches    ;;setups the starting resources according to the sliders
ask n-of starting-sugar patches with [pcolor = black] [set pcolor blue] 
ask n-of starting-grass patches with [pcolor = black] [set pcolor green] 
ask n-of starting-meat patches with [pcolor = black] [set pcolor red] 
end

to setup-breeds                   ;; setup the 3 enemy breeds in the world
  create-sugarmen number-sugarmen      ;;sugarmen
  
  [
    set color pink
    set size 1.5  ;; easier to see
    set energy birth-energy-sugarmen
    setxy random-xcor random-ycor
  ]
  
  create-grassmen number-grassmen      ;;grassmen
  
    [
    set color 117
    set size 1.5  ;; easier to see
    set energy birth-energy-grassmen
    setxy random-xcor random-ycor
  ]
  
  
  create-meatmen number-meatmen        ;;meatmen
  
  
    [
    set color 46
    set size 1.5  ;; easier to see
    set energy birth-energy-meatmen
    setxy random-xcor random-ycor
  ]

display-labels  
end







to go          ;;the go procedure. This procedure treats each species in a series, which could in theory alter the dynamics observed.
           ;;;;; Future versions should treat this problem.



ask sugarmen [ 
move
sugar-kill
sugar-eat
reproduce-sugarmen
death ]




ask grassmen[
move
grass-kill
grass-eat
reproduce-grassmen
death]


ask meatmen [
move
meat-kill
meat-eat
reproduce-meatmen
death]


ifelse grow-resources-aggresive 
[grow-patches-aggr]
[grow-patches]

display-labels 
update-plot
tick

;;;;;;;;;;;; This procedure here checks if any species are extinct and shows a message if so. 
;;;;;;;;;;;; If all the species are extinct, then the storyline ends.

if not any? sugarmen and sugar-die = "0" [set sugar-die "1" show word " Sugarmen death at " ticks]
if not any? grassmen and grass-die = "0" [set grass-die "1" show word " Grassmen death at " ticks]
if not any? meatmen and meat-die = "0" [set meat-die "1" show word " Meatmen death at " ticks]
if not any? turtles and not any? patches with [pcolor = black][show word " End of storyline! :) at " ticks stop]


end


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;COMMON PROCEDURES

to move          ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; move procedure common for all agents
 if breed = sugarmen and hunt-resources [search-food-sugar] 
  if breed = grassmen and hunt-resources [search-food-grass]
 if breed = meatmen and hunt-resources [search-food-meat]
 
  if not hunt-resources
 [  rt random 360
  fd 1]
  
  set energy energy - 1
end







to display-labels  ;;;;;;;;;;;;;;;Display labels with the energy of each agent
  ask turtles [ set label round energy ]
end

to death

if energy < 0 [die]

end


to grow-patches ;;;;;; This is the grow patches procedure. A little fault in this procedure
                  ;;;; is that the series by which the if commands are executed are not random. 
              ;;;;;;;;;This could be improved in future versions of the model

if any? patches with [pcolor = black][

if random 100 < sugar-prob [
ask one-of patches with [pcolor = black]
[set pcolor blue]]
]

if any? patches with [pcolor = black][
if random 100 < meat-prob [
ask one-of patches with [pcolor = black]
[set pcolor red]]
]


if any? patches with [pcolor = black][
if random 100 < grass-prob [
ask one-of patches with [pcolor = black]
[set pcolor green]]
]



end


to grow-patches-aggr ;;;;;;The aggresive pathes spawning function



if random 100 < sugar-prob [
ask one-of patches
[set pcolor blue]]



if random 100 < meat-prob [
ask one-of patches
[set pcolor red]]




if random 100 < grass-prob [
ask one-of patches 
[set pcolor green]]




end

to update-plot ;;;;;;;;;;;;;;;;;;;;;;Update the plots
  set-current-plot "populations"
  set-current-plot-pen "sugarmen"
  plot count sugarmen
  set-current-plot-pen "grassmen"
  plot count grassmen
set-current-plot-pen "meatmen"
  plot count meatmen
  
  
  set-current-plot "resources"
  set-current-plot-pen "sugar"
  plot count patches with [pcolor = blue]
  set-current-plot-pen "grass"
  plot count patches with [pcolor = green]
set-current-plot-pen "meat"
  plot count patches with [pcolor = red]
  
end




;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;SUGARMEN PROCEDURES

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
to sugar-kill   ;;the procedure that sugarmen use to kill
 
 if sugarmen-kill = "sugarmen"[ let prey one-of sugarmen-here
if prey != nobody
  [ ask prey [ die ] ]
]

 if sugarmen-kill = "grassmen"[ let prey one-of grassmen-here
if prey != nobody
  [ ask prey [ die ] ]
]

 if sugarmen-kill = "meatmen"[ let prey one-of meatmen-here
if prey != nobody
  [ ask prey [ die ] ]
]

 if sugarmen-kill = "sugarmen-grassmen" [let prey one-of sugarmen-here let prey2 one-of grassmen-here
if prey != nobody
  [ ask prey [ die ] ]
    
if prey2 != nobody
  [ ask prey2 [ die ] ]
  ]

 if sugarmen-kill = "sugarmen-meatmen" [let prey one-of sugarmen-here let prey2 one-of meatmen-here
if prey != nobody
  [ ask prey [ die ] ]
    
if prey2 != nobody
  [ ask prey2 [ die ] ]
  ]

 if sugarmen-kill = "grassmen-meatmen" [let prey one-of grassmen-here let prey2 one-of meatmen-here
if prey != nobody
  [ ask prey [ die ] ]
    
if prey2 != nobody
  [ ask prey2 [ die ] ]
  ]

 if sugarmen-kill = "sugarmen-grassmen-meatmen" [let prey one-of sugarmen-here    
if prey != nobody
  [ ask prey [ die ] ]
  
let prey2 one-of grassmen-here
  
    
if prey2 != nobody
  [ ask prey2 [ die ] ]

   
let prey3 one-of meatmen-here
    
if prey3 != nobody
  [ ask prey3 [ die ] ]
  ]

end

to sugar-eat  ;; sugarmen procedure
              ;; sugarmen eat sugar, turn patch black
  if pcolor = blue [
    set pcolor black
    set energy energy + energy-from-sugar  ;; sheep gain energy by eating
  ]
end


to reproduce-sugarmen

if energy > (birth-energy-sugarmen * 2) [

set energy (energy - birth-energy-sugarmen)
hatch 1 [ rt random-float 360 fd 1 ]
]

end


to search-food-sugar ;;;;;;;;;;That is the hunt-resource function, that makes agents act "smart"

if any? patches in-cone vision vision-angle with [pcolor = blue] [

ask patches with [pcolor = blue] in-cone vision vision-angle with-min [distance myself]  [set px pxcor set py pycor] 
set heading towardsxy px py

]
fd 1
end


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;GRASSMEN PROCEDURES
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
to grass-kill   ;;the procedure that sugarmen use to kill
 
 if grassmen-kill = "sugarmen"[ let prey one-of sugarmen-here
if prey != nobody
  [ ask prey [ die ] ]
]

 if grassmen-kill = "grassmen"[ let prey one-of grassmen-here
if prey != nobody
  [ ask prey [ die ] ]
]

 if grassmen-kill = "meatmen"[ let prey one-of meatmen-here
if prey != nobody
  [ ask prey [ die ] ]
]

 if grassmen-kill = "sugarmen-grassmen" [let prey one-of sugarmen-here let prey2 one-of grassmen-here
if prey != nobody
  [ ask prey [ die ] ]
    
if prey2 != nobody
  [ ask prey2 [ die ] ]
  ]

 if grassmen-kill = "sugarmen-meatmen" [let prey one-of sugarmen-here let prey2 one-of meatmen-here
if prey != nobody
  [ ask prey [ die ] ]
    
if prey2 != nobody
  [ ask prey2 [ die ] ]
  ]

 if grassmen-kill = "grassmen-meatmen" [let prey one-of grassmen-here let prey2 one-of meatmen-here
if prey != nobody
  [ ask prey [ die ] ]
    
if prey2 != nobody
  [ ask prey2 [ die ] ]
  ]

 if grassmen-kill = "sugarmen-grassmen-meatmen" [let prey one-of sugarmen-here    
if prey != nobody
  [ ask prey [ die ] ]
  
let prey2 one-of grassmen-here
  
    
if prey2 != nobody
  [ ask prey2 [ die ] ]

   
let prey3 one-of meatmen-here
    
if prey3 != nobody
  [ ask prey3 [ die ] ]
  ]

end

to grass-eat  ;; sugarmen procedure
  ;; sugarmen eat sugar, turn patch black
  if pcolor = green [
    set pcolor black
    set energy energy + energy-from-grass  ;; cows gain energy by eating
  ]
end


to reproduce-grassmen

if energy > (birth-energy-grassmen * 2) [

set energy (energy - birth-energy-grassmen)
hatch 1 [ rt random-float 360 fd 1 ]
]

end



to search-food-grass ;;;;;;;;;;That is the hunt-resource function, that makes agents act "smart"

if any? patches in-cone vision vision-angle with [pcolor = green] [

ask patches with [pcolor = green] in-cone vision vision-angle with-min [distance myself]  [set px pxcor set py pycor] 
set heading towardsxy px py

]
fd 1
end
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;


to meat-kill   ;;the procedure that sugarmen use to kill
 
 if meatmen-kill = "sugarmen"[ let prey one-of sugarmen-here
if prey != nobody
  [ ask prey [ die ] ]
]

 if meatmen-kill = "grassmen"[ let prey one-of grassmen-here
if prey != nobody
  [ ask prey [ die ] ]
]

 if meatmen-kill = "meatmen"[ let prey one-of meatmen-here
if prey != nobody
  [ ask prey [ die ] ]
]

 if meatmen-kill = "sugarmen-grassmen" [let prey one-of sugarmen-here let prey2 one-of grassmen-here
if prey != nobody
  [ ask prey [ die ] ]
    
if prey2 != nobody
  [ ask prey2 [ die ] ]
  ]

 if meatmen-kill = "sugarmen-meatmen" [let prey one-of sugarmen-here let prey2 one-of meatmen-here
if prey != nobody
  [ ask prey [ die ] ]
    
if prey2 != nobody
  [ ask prey2 [ die ] ]
  ]

 if grassmen-kill = "grassmen-meatmen" [let prey one-of grassmen-here let prey2 one-of meatmen-here
if prey != nobody
  [ ask prey [ die ] ]
    
if prey2 != nobody
  [ ask prey2 [ die ] ]
  ]

 if meatmen-kill = "sugarmen-grassmen-meatmen" [let prey one-of sugarmen-here    
if prey != nobody
  [ ask prey [ die ] ]
  
let prey2 one-of grassmen-here
  
    
if prey2 != nobody
  [ ask prey2 [ die ] ]

   
let prey3 one-of meatmen-here
    
if prey3 != nobody
  [ ask prey3 [ die ] ]
  ]

end

to meat-eat  ;; sugarmen procedure
  ;; sugarmen eat sugar, turn patch black
  if pcolor = red [
    set pcolor black
    set energy energy + energy-from-meat  ;; sheep gain energy by eating
  ]
end


to reproduce-meatmen

if energy > (birth-energy-meatmen * 2) [

set energy (energy - birth-energy-meatmen)
hatch 1 [ rt random-float 360 fd 1 ]
]




end


to search-food-meat ;;;;;;;;;;That is the hunt-resource function, that makes agents act "smart"

if any? patches in-cone vision vision-angle with [pcolor = red] [

ask patches with [pcolor = red] in-cone vision vision-angle with-min [distance myself]  [set px pxcor set py pycor] 
set heading towardsxy px py

]
fd 1
end

; *** NetLogo 4.0.4 Code Example Copyright Notice ***
;
; (C) 2009 Stylianos Kampakis. 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 Stylianos Kampakis
; 
;
; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
; A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
; OWNERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
; LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;
; *** End of NetLogo 4.0.4 Code Example Copyright Notice ***
@#$#@#$#@
GRAPHICS-WINDOW
653
10
1083
461
17
17
12.0
1
10
1
1
1
0
1
1
1
-17
17
-17
17
1
1
1
ticks

CC-WINDOW
5
797
1131
892
Command Center
0

BUTTON
39
40
123
73
NIL
setup
NIL
1
T
OBSERVER
NIL
NIL
NIL
NIL

BUTTON
126
40
203
73
NIL
go
T
1
T
OBSERVER
NIL
NIL
NIL
NIL

MONITOR
26
443
128
488
NIL
count sugarmen
3
1
11

SWITCH
29
255
230
288
grow-resources-aggresive
grow-resources-aggresive
1
1
-1000

SLIDER
223
131
401
164
birth-energy-sugarmen
birth-energy-sugarmen
0
100
100
1
1
NIL
HORIZONTAL

MONITOR
172
511
259
556
grass
count patches with [pcolor = green]
3
1
11

PLOT
422
472
735
678
Populations
time
totals
0.0
10.0
0.0
10.0
true
true
PENS
"Sugarmen" 1.0 0 -13345367 true
"Grassmen" 1.0 0 -10899396 true
"Meatmen" 1.0 0 -2674135 true

SLIDER
36
131
208
164
number-sugarmen
number-sugarmen
0
100
20
1
1
NIL
HORIZONTAL

SLIDER
35
170
207
203
number-grassmen
number-grassmen
0
100
20
1
1
NIL
HORIZONTAL

SLIDER
36
213
208
246
number-meatmen
number-meatmen
0
100
20
1
1
NIL
HORIZONTAL

SLIDER
223
171
400
204
birth-energy-grassmen
birth-energy-grassmen
0
100
100
1
1
NIL
HORIZONTAL

SLIDER
222
214
396
247
birth-energy-meatmen
birth-energy-meatmen
0
100
100
1
1
NIL
HORIZONTAL

SLIDER
421
131
593
164
energy-from-sugar
energy-from-sugar
0
100
50
1
1
NIL
HORIZONTAL

SLIDER
419
174
591
207
energy-from-grass
energy-from-grass
0
100
50
1
1
NIL
HORIZONTAL

SLIDER
418
217
590
250
energy-from-meat
energy-from-meat
0
100
50
1
1
NIL
HORIZONTAL

MONITOR
20
513
115
558
sugar
count patches with [pcolor = blue]
17
1
11

MONITOR
301
516
394
561
meat
count patches with [pcolor = red]
17
1
11

MONITOR
303
442
401
487
NIL
count meatmen
17
1
11

MONITOR
169
442
270
487
NIL
count grassmen
17
1
11

SLIDER
48
340
220
373
starting-sugar
starting-sugar
0
100
100
1
1
NIL
HORIZONTAL

SLIDER
234
341
406
374
starting-grass
starting-grass
0
100
100
1
1
NIL
HORIZONTAL

SLIDER
433
340
605
373
starting-meat
starting-meat
0
100
100
1
1
NIL
HORIZONTAL

SLIDER
47
398
219
431
sugar-prob
sugar-prob
0
100
80
1
1
NIL
HORIZONTAL

SLIDER
235
398
407
431
grass-prob
grass-prob
0
100
80
1
1
NIL
HORIZONTAL

SLIDER
434
398
606
431
meat-prob
meat-prob
0
100
80
1
1
NIL
HORIZONTAL

CHOOSER
13
596
229
641
sugarmen-kill
sugarmen-kill
"sugarmen" "grassmen" "meatmen" "sugarmen-grassmen" "sugarmen-meatmen" "grassmen-meatmen" "sugarmen-grassmen-meatmen" "none"
1

CHOOSER
12
650
228
695
grassmen-kill
grassmen-kill
"sugarmen" "grassmen" "meatmen" "sugarmen-grassmen" "sugarmen-meatmen" "grassmen-meatmen" "sugarmen-grassmen-meatmen" "none"
2

CHOOSER
10
705
226
750
meatmen-kill
meatmen-kill
"sugarmen" "grassmen" "meatmen" "sugarmen-grassmen" "sugarmen-meatmen" "grassmen-meatmen" "sugarmen-grassmen-meatmen" "none"
0

PLOT
796
471
1122
679
resources
time
totals
0.0
10.0
0.0
10.0
true
true
PENS
"Sugar" 1.0 0 -13345367 true
"Grass" 1.0 0 -10899396 true
"Meat" 1.0 0 -2674135 true

SWITCH
243
257
367
290
hunt-resources
hunt-resources
1
1
-1000

SLIDER
432
262
604
295
vision
vision
0
100
3
1
1
NIL
HORIZONTAL

SLIDER
431
299
603
332
vision-angle
vision-angle
0
360
60
1
1
NIL
HORIZONTAL

BUTTON
218
42
281
75
NIL
go
NIL
1
T
OBSERVER
NIL
NIL
NIL
NIL

TEXTBOX
425
699
735
783
Sugarmen = Butterflies\nGrassmen = Cows\nMeatmen = People
11
0.0
1

TEXTBOX
44
98
194
116
Initial number of species
11
0.0
1

TEXTBOX
234
95
384
113
Energy required to give birth
11
0.0
1

TEXTBOX
428
86
599
114
Energy that each species receives from its resource
11
0.0
1

TEXTBOX
33
291
183
319
Non-aggresive resources are spawned only on black patches
11
0.0
1

TEXTBOX
233
293
409
335
hunt-resources determines whether the agents act randomly or \"smart\"
11
0.0
1

TEXTBOX
243
596
372
670
These tabs determine which species attacks which species
11
0.0
1

@#$#@#$#@
WHAT IS IT?
The 3 species model is an experimental model, done by Stylianos Kampakis to explore the possibilities of NetLogo. It is actually a very simple idealizied biological model, where 3 different species, with many parameters, fight for survival.
 
HOW IT WORKS
First of all, you have to see that there 3 species. Sugarmen, meatmen and grassmen. Sugarmen are butterflies and eat sugar, grassmen are cows and eat grass, meatmen are little people and eat meat. Sugar is blue, grass green and meat red. All 3 species have an energy rating which starts at 100. The lose 1 point of energy with each move, and gain energy when they eat.

To eat, they have to step on a patch with the resource they consume. They eat the resource and then the patch turns black.

When their energy levels get double the birth-energy variable, the spawn another identical creature with them. The creature has half the energy they have and their energy is halved as well.

Each type of resource has a probability per round of being spawned on a single patch equal to the probabilities sliders.

RULES
The rules of the species for the initial configuration are the following:
1. Move at random one step in 360 degrees angle
2. If you are on a patch with an enemy creature kill it.
3. If you are on a patch with the resource you use, eat the patch, gain energy equal to the energy for the specified resources
4. If you have energy equal to birth-energy x 2, then hatch another creature of your species with half your energy, and then lose half your energy, too.
5. If your energy is lower than 0, die.

In the initial configurations, resources are spawned non-aggresively. That is, they are spawned ONLY on black patches. Note also, that no matter whether the resources spawn aggresively or not, each resource, gets each round either 1 new patch (at most) or none at all. There is no configuration, for example, to spawn 10 new patches of meat at a round.

In the initial configuration, also, agents have no vision and their behavior is random (hunt-resources is turned to off). This means, that they will hunt resources and kill enemies roaming at random. If the hunt-resources is on, then they hunt resources at a distance indicated by vision and and an angle indicated by the respective slider.
 
THINGS TO NOTICE
There are two sets of variables you can change: 

1)The individual species variables
2)The general variables

The individual variables are the following: starting number, birth energy, energy from food, starting resources, probability of each resource spawning each round and which species they attack.

The general variables are these: aggresive resources and hunt resources 

The most important of all variables are by far the general variables. The changing of these variables produces the most interesting dynamics.

If you turn both of these off, even though you'll see an interesting set of interactions, in the end the same state is achieved: total extinction.

The model, under this configuration, has a strong stochastic component. Agents move randomly, and resources are spawned randomly each round and at random patches.

When the agents do not hunt resources they can only survive if they fall on them during their random walks. What I witnessed by my experiments is that in the end remains only one species and in the end, it dies too. The reason is simple. If the resources are not aggresive, then each round there is a probability that a patch will spawn one of the three resources, or remain black. With all things equal, it is more probable, that the patch will grow the other resources, rather than remain black.

Therefore, a species, that does not hunt resources, and with resources that do not spawn aggresively, is doomed to extinction.

However, in case that a second species manage to survive for some time, then the two species can survive longer, since they produce an interesting set of dynamics, by allowing more black patches to appear, while the one species could kill the other in order to keep its numbers in track.

Indeed, in this model, should a species numbers get too large, under any configuration, then they are instantly reduced. The limited space, cannot support an unlimited number of agents.

The most interesting dynamics were observed under the hunt resources switch turned on. Even with non aggresive resources, the species could survive for many thousand rounds, each one's population curve following something that seemed like an sine oscillator.

With aggresive resources on and hunt resources on as well, it is self-evident that at least one species could survive forever.

SPECIAL NOTES
Note that these observations were based on a limited set of runs I did myself. The correct procedure would be to make many runs with many configurations and pass them into mathematica via the MathematicaLink that netlogo provides, in order to draw more safe conclusions. However, this model is experimental and not highly specific and, also, in its first steps, so this was not deemed a priority.
 
THINGS TO TRY
Besides the most interesting cases described above, try playing around with each species seperately, changing which species it kills, how easy it reprodeces etc. and then notice how often it survives or dies.
 
EXTENDING THE MODEL
This model could be extended in two possible directions in my opinion.

1) Make the model more specific. That is, model some more specific procedure, perhaps by taking out some parameters and introducing others. The truth is that the model holds many parameters as I experimented with the possibilities NetLogo offered, but as the parameters get more, this could work in disadvantage of a specific model, making it highly complex.

2) Make the model even more complex, by adding more parameters that could be used in real situations. Even though this would get to complex to represent any real situation, it would be interesting to see the following additions: species getting energy by eating other species, species eating the same resource, species reproducing sexually (not asexually as in the current model) and agent mutations.
 
NETLOGO FEATURES
The construction of the model was higly helped by the cone primitive in NetLogo which was used to hunt resources.
 
RELATED MODELS
This model was inspired in part by the Tutorial 3 model and the Wolf Sheep Predation (docked) model.
 
CREDITS AND REFERENCES
(C) 2009 Stylianos Kampakis. 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 Stylianos Kampakis

Official Site: http://encefalus.com
 
@#$#@#$#@
default
true
0
Polygon -7500403 true true 150 5 40 250 150 205 260 250

airplane
true
0
Polygon -7500403 true true 150 0 135 15 120 60 120 105 15 165 15 195 120 180 135 240 105 270 120 285 150 270 180 285 210 270 165 240 180 180 285 195 285 165 180 105 180 60 165 15

arrow
true
0
Polygon -7500403 true true 150 0 0 150 105 150 105 293 195 293 195 150 300 150

box
false
0
Polygon -7500403 true true 150 285 285 225 285 75 150 135
Polygon -7500403 true true 150 135 15 75 150 15 285 75
Polygon -7500403 true true 15 75 15 225 150 285 150 135
Line -16777216 false 150 285 150 135
Line -16777216 false 150 135 15 75
Line -16777216 false 150 135 285 75

bug
true
0
Circle -7500403 true true 96 182 108
Circle -7500403 true true 110 127 80
Circle -7500403 true true 110 75 80
Line -7500403 true 150 100 80 30
Line -7500403 true 150 100 220 30

butterfly
true
0
Polygon -7500403 true true 150 165 209 199 225 225 225 255 195 270 165 255 150 240
Polygon -7500403 true true 150 165 89 198 75 225 75 255 105 270 135 255 150 240
Polygon -7500403 true true 139 148 100 105 55 90 25 90 10 105 10 135 25 180 40 195 85 194 139 163
Polygon -7500403 true true 162 150 200 105 245 90 275 90 290 105 290 135 275 180 260 195 215 195 162 165
Polygon -16777216 true false 150 255 135 225 120 150 135 120 150 105 165 120 180 150 165 225
Circle -16777216 true false 135 90 30
Line -16777216 false 150 105 195 60
Line -16777216 false 150 105 105 60

car
false
0
Polygon -7500403 true true 300 180 279 164 261 144 240 135 226 132 213 106 203 84 185 63 159 50 135 50 75 60 0 150 0 165 0 225 300 225 300 180
Circle -16777216 true false 180 180 90
Circle -16777216 true false 30 180 90
Polygon -16777216 true false 162 80 132 78 134 135 209 135 194 105 189 96 180 89
Circle -7500403 true true 47 195 58
Circle -7500403 true true 195 195 58

circle
false
0
Circle -7500403 true true 0 0 300

circle 2
false
0
Circle -7500403 true true 0 0 300
Circle -16777216 true false 30 30 240

cow
false
0
Polygon -7500403 true true 200 193 197 249 179 249 177 196 166 187 140 189 93 191 78 179 72 211 49 209 48 181 37 149 25 120 25 89 45 72 103 84 179 75 198 76 252 64 272 81 293 103 285 121 255 121 242 118 224 167
Polygon -7500403 true true 73 210 86 251 62 249 48 208
Polygon -7500403 true true 25 114 16 195 9 204 23 213 25 200 39 123

cylinder
false
0
Circle -7500403 true true 0 0 300

dot
false
0
Circle -7500403 true true 90 90 120

face happy
false
0
Circle -7500403 true true 8 8 285
Circle -16777216 true false 60 75 60
Circle -16777216 true false 180 75 60
Polygon -16777216 true false 150 255 90 239 62 213 47 191 67 179 90 203 109 218 150 225 192 218 210 203 227 181 251 194 236 217 212 240

face neutral
false
0
Circle -7500403 true true 8 7 285
Circle -16777216 true false 60 75 60
Circle -16777216 true false 180 75 60
Rectangle -16777216 true false 60 195 240 225

face sad
false
0
Circle -7500403 true true 8 8 285
Circle -16777216 true false 60 75 60
Circle -16777216 true false 180 75 60
Polygon -16777216 true false 150 168 90 184 62 210 47 232 67 244 90 220 109 205 150 198 192 205 210 220 227 242 251 229 236 206 212 183

fish
false
0
Polygon -1 true false 44 131 21 87 15 86 0 120 15 150 0 180 13 214 20 212 45 166
Polygon -1 true false 135 195 119 235 95 218 76 210 46 204 60 165
Polygon -1 true false 75 45 83 77 71 103 86 114 166 78 135 60
Polygon -7500403 true true 30 136 151 77 226 81 280 119 292 146 292 160 287 170 270 195 195 210 151 212 30 166
Circle -16777216 true false 215 106 30

flag
false
0
Rectangle -7500403 true true 60 15 75 300
Polygon -7500403 true true 90 150 270 90 90 30
Line -7500403 true 75 135 90 135
Line -7500403 true 75 45 90 45

flower
false
0
Polygon -10899396 true false 135 120 165 165 180 210 180 240 150 300 165 300 195 240 195 195 165 135
Circle -7500403 true true 85 132 38
Circle -7500403 true true 130 147 38
Circle -7500403 true true 192 85 38
Circle -7500403 true true 85 40 38
Circle -7500403 true true 177 40 38
Circle -7500403 true true 177 132 38
Circle -7500403 true true 70 85 38
Circle -7500403 true true 130 25 38
Circle -7500403 true true 96 51 108
Circle -16777216 true false 113 68 74
Polygon -10899396 true false 189 233 219 188 249 173 279 188 234 218
Polygon -10899396 true false 180 255 150 210 105 210 75 240 135 240

house
false
0
Rectangle -7500403 true true 45 120 255 285
Rectangle -16777216 true false 120 210 180 285
Polygon -7500403 true true 15 120 150 15 285 120
Line -16777216 false 30 120 270 120

leaf
false
0
Polygon -7500403 true true 150 210 135 195 120 210 60 210 30 195 60 180 60 165 15 135 30 120 15 105 40 104 45 90 60 90 90 105 105 120 120 120 105 60 120 60 135 30 150 15 165 30 180 60 195 60 180 120 195 120 210 105 240 90 255 90 263 104 285 105 270 120 285 135 240 165 240 180 270 195 240 210 180 210 165 195
Polygon -7500403 true true 135 195 135 240 120 255 105 255 105 285 135 285 165 240 165 195

line
true
0
Line -7500403 true 150 0 150 300

line half
true
0
Line -7500403 true 150 0 150 150

pentagon
false
0
Polygon -7500403 true true 150 15 15 120 60 285 240 285 285 120

person
false
0
Circle -7500403 true true 110 5 80
Polygon -7500403 true true 105 90 120 195 90 285 105 300 135 300 150 225 165 300 195 300 210 285 180 195 195 90
Rectangle -7500403 true true 127 79 172 94
Polygon -7500403 true true 195 90 240 150 225 180 165 105
Polygon -7500403 true true 105 90 60 150 75 180 135 105

plant
false
0
Rectangle -7500403 true true 135 90 165 300
Polygon -7500403 true true 135 255 90 210 45 195 75 255 135 285
Polygon -7500403 true true 165 255 210 210 255 195 225 255 165 285
Polygon -7500403 true true 135 180 90 135 45 120 75 180 135 210
Polygon -7500403 true true 165 180 165 210 225 180 255 120 210 135
Polygon -7500403 true true 135 105 90 60 45 45 75 105 135 135
Polygon -7500403 true true 165 105 165 135 225 105 255 45 210 60
Polygon -7500403 true true 135 90 120 45 150 15 180 45 165 90

square
false
0
Rectangle -7500403 true true 30 30 270 270

square 2
false
0
Rectangle -7500403 true true 30 30 270 270
Rectangle -16777216 true false 60 60 240 240

star
false
0
Polygon -7500403 true true 151 1 185 108 298 108 207 175 242 282 151 216 59 282 94 175 3 108 116 108

target
false
0
Circle -7500403 true true 0 0 300
Circle -16777216 true false 30 30 240
Circle -7500403 true true 60 60 180
Circle -16777216 true false 90 90 120
Circle -7500403 true true 120 120 60

tree
false
0
Circle -7500403 true true 118 3 94
Rectangle -6459832 true false 120 195 180 300
Circle -7500403 true true 65 21 108
Circle -7500403 true true 116 41 127
Circle -7500403 true true 45 90 120
Circle -7500403 true true 104 74 152

triangle
false
0
Polygon -7500403 true true 150 30 15 255 285 255

triangle 2
false
0
Polygon -7500403 true true 150 30 15 255 285 255
Polygon -16777216 true false 151 99 225 223 75 224

truck
false
0
Rectangle -7500403 true true 4 45 195 187
Polygon -7500403 true true 296 193 296 150 259 134 244 104 208 104 207 194
Rectangle -1 true false 195 60 195 105
Polygon -16777216 true false 238 112 252 141 219 141 218 112
Circle -16777216 true false 234 174 42
Rectangle -7500403 true true 181 185 214 194
Circle -16777216 true false 144 174 42
Circle -16777216 true false 24 174 42
Circle -7500403 false true 24 174 42
Circle -7500403 false true 144 174 42
Circle -7500403 false true 234 174 42

turtle
true
0
Polygon -10899396 true false 215 204 240 233 246 254 228 266 215 252 193 210
Polygon -10899396 true false 195 90 225 75 245 75 260 89 269 108 261 124 240 105 225 105 210 105
Polygon -10899396 true false 105 90 75 75 55 75 40 89 31 108 39 124 60 105 75 105 90 105
Polygon -10899396 true false 132 85 134 64 107 51 108 17 150 2 192 18 192 52 169 65 172 87
Polygon -10899396 true false 85 204 60 233 54 254 72 266 85 252 107 210
Polygon -7500403 true true 119 75 179 75 209 101 224 135 220 225 175 261 128 261 81 224 74 135 88 99

wheel
false
0
Circle -7500403 true true 3 3 294
Circle -16777216 true false 30 30 240
Line -7500403 true 150 285 150 15
Line -7500403 true 15 150 285 150
Circle -7500403 true true 120 120 60
Line -7500403 true 216 40 79 269
Line -7500403 true 40 84 269 221
Line -7500403 true 40 216 269 79
Line -7500403 true 84 40 221 269

x
false
0
Polygon -7500403 true true 270 75 225 30 30 225 75 270
Polygon -7500403 true true 30 75 75 30 270 225 225 270

@#$#@#$#@
NetLogo 4.0.4
@#$#@#$#@
@#$#@#$#@
@#$#@#$#@
@#$#@#$#@
@#$#@#$#@
default
0.0
-0.2 0 0.0 1.0
0.0 1 1.0 0.0
0.2 0 0.0 1.0
link direction
true
0
Line -7500403 true 150 150 90 180
Line -7500403 true 150 150 210 180

@#$#@#$#@