;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;Ant Optimization;;;;;;;
;;;;;;;By Steve Johnson;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;;;;;;;;;Varables;;;;;;;;;;;;

globals [clock de-wall evap? Gheading Increment] 

breeds [hive worker builder food] ;;These are the diferent turtle "breeds" used in this model
hive-own [hfood] ;;This variable keeps track of a hive's food level
worker-own [wfood whome havefood?] ;;The wfood and whome (workerfood and workerhome) variables keep track of the ant's chemical strength level.  These diminish with each step.  The last variable tells the ant if it is carrying food
builder-own [btime] ;;This is used by the model to create the walls
food-own [ffood] ;;This variable keep track of the size of a food source

patches-own [foodc homec wall?] ;;These variables store the food and home chemicals on that patch and tell the patch if it is a wall

;;;;;;;;Setup Methods;;;;;;;;;

to setup ;;Orchestrates the program setup
ca ;;Clear all: resets the world
set clock 0 ;;A clock variable used time things
set de-wall false ;;A variable used in the third custom setup
set evap? false
setup-shapes ;;Assigns shapes for the various turtle breeds
setup-patches ;;Sets up the patches
setup-hive ;;Sets up the hive and ant turtle breeds
setup-food ;;Sets up the food turtle breed
end

to setup-shapes ;;Assigns shapes for the various turtle breeds
set-default-shape hive "hive"
set-default-shape worker "ant"
set-default-shape food "food"
if(fun-shapes) ;;A joke option that will assign random shapes to each breed
[
ask turtles
[set size 1]
set-default-shape hive random-one-of shapes
set-default-shape worker random-one-of shapes
set-default-shape food random-one-of shapes
]
end

to setup-patches ;;Sets up the patches
ask patches
[set wall? false] ;;All patches start out as non-walls
let temp 0
while [temp < num-walls]
  [
  create-custom-builder 1
    [
    setxy random-x random-y ;;placement of walls is random
    set heading random 360 ;;direction of walls is random
    set btime random 15 + 20 ;;length of walls is random
    let temp2 0
    while [temp2 < btime]
      [
      ask patch-here
        [
        set wall? true ;;Changes this patch
        ask neighbors [set wall? true] ;;and nearby patches into walls
        ]
      if(abs pxcor-of patch-ahead 1 > screen-edge-x - 1 or abs pycor-of patch-ahead 1 > screen-edge-y - 1) ;;Ensures that the turtle does not walk off the screen edge
        [rt 180]
      fd 1
      set temp2 temp2 + 1
      ]
    die ;;Disposes of the builder afterwards
    ]
  set temp temp + 1
  ]
ask patches
[if (wall?) [set pcolor 9]] ;;Walls are displayed as white.  Non-walls remain black
end

to setup-hive ;;Sets up the hive and ant turtle breeds
create-custom-hive 1
  [
  set color new-random-color ;;hives assume a random color
  setxy 0 -30  ;;hives have a set position
  while[wall?-of patch-here] ;;choses a new position if the set position was walled
  [setxy random-x random-y  ]
  set hfood 1 ;;hives start with no food
  set size 0 ;;the hive's size is proportional to its food
  hatch-worker num-ants ;;the hive spawns some ants
    [
    set size 1
    set heading random 360 ;;ants begin facing a random direction
    set havefood? false ;;ants are not carrying food when created
    set whome 100 ;;ants begin on the same spot as the hive and must have this variable adjusted accordingly
    ]
  ]
end

to setup-food ;;Sets up the food turtle breed
set Gheading 0
set increment 160 / (food-start + 1)
let temp 1
while [temp <= food-start]
  [
  create-custom-food 1
    [
    set color green ;;Leaves are green...duh
    set ffood food-val ;;each piece of food has an amount of food set by food-val
    set size sqrt (ffood / 25) ;;food sources get smaller as they are depleted
    setxy random-x random-y ;;food is placed randomly
    if fixed-position? ;;if the fixed position mode is on then the food has a set location
      [
      setxy 0 -15
      set heading 80
      lt Gheading + increment
      fd 45
      set Gheading Gheading + increment
      ]
    while[wall?-of patch-here] ;;moves the food if its current location was walled
      [setxy random-x random-y]
      set heading random 360
    ]
  set temp temp + 1
  ]
end

;;;;;;;;;The Go Methods;;;;;;;;;

to go ;;Orchestrates the go methods
go-food ;;Tells the food what to do on each time step
go-hive ;;Tells the hive what to do on each time step
go-workers ;;Tells the ants what to do on each time step
go-patches ;;Tells the patches what to do on each time step
plot now-food ;;sends feedback to the graph in the GUI
if not (evap? and hfood-of random-one-of hive >= 2001)
[set clock clock + 1] ;;increments the clock

if(de-wall and clock = de-wall-val) ;;Used to remove the walls in the third custom setup
[
create-custom-builder 1
  [
  setxy -4 -12
  set heading 0
  set btime 5
  ]
create-custom-builder 1
  [
  setxy -4 16
  set heading 0
  set btime 5
  ]
ask builder
  [
  while [btime > 0]
    [
    ask patch-here
      [
      set wall? false
      ask neighbors [set wall? false]
      ]
    if(abs pxcor-of patch-ahead 1 > screen-edge-x - 1 or abs pycor-of patch-ahead 1 > screen-edge-y - 1)
      [rt 180]
    fd 1
    set btime btime - 1
    ]
  die
  ]
]
end

to go-food ;;Tells the food what to do on each time step
ask food
[
if(ffood < 5) ;;If the food source drops below a certain level it gets removed
  [die]
set size sqrt (ffood / 25) ;;The food source gets smaller as it is depleted
]
end

to go-hive ;;Tells the hive what to do on each time step
ask hive
[
set size 1 + sqrt (hfood / 100) ;;The hive gets bigger as ants bring in more food
]
end

to go-workers ;;Tells the ants what to do on each time step
ask worker
[
if any? hive-on patch-here ;;adjust your pheromone value if there is a hive here
  [set whome 100 set homec-of patch-here whome]
if any? food-on patch-here ;;adjust your pheromone value if there is food here
  [set wfood 100 set foodc-of patch-here wfood]
ifelse(havefood?) ;;does this ant have food?
  [return-to-nest] ;;if so, return to the nest
  [search-for-food] ;;if not, go look for food
]
end

to return-to-nest ;;ants will return to the hive if they are carrying food
ifelse any? hive-on patch-here ;;is there a hive here
  [
  ask one-of hive-on patch-here ;;add food to the hive
    [set hfood hfood + 5]
  set havefood? false ;;the ant is no longer carrying food
  set wfood 0 ;;the ant has just left the hive, so its food pheromone value is set to 0
  rt 180 ;;turn around and go look for more food
  ]
  [
  ifelse any? hive-on neighbors ;;if there is no hive here, is there one next door?
    [
    set heading towards one-of hive-on neighbors ;;if so, go there
    ]
    [
    let pos1 patch-left-and-ahead 45 1 ;;if not, check the three patches in front of you
    let pos2 patch-right-and-ahead 45 1
    if homec-of pos2 > homec-of pos1
      [set pos1 pos2] ;;find which has the strongest pheromone value
    ifelse homec-of pos1 > homec-of patch-ahead 1  ;;check if the values in front of you arent all the same
      [ ;;if not, go towarsd the strongest value
      set heading towards pos1
      wiggle
      ]
      [ ;;if so, go in a random direction
      rt random 45
      lt random 45
      ]
    check-wrapping ;;Ensures that ants do not walk off the screen edge
    ]
  ]
fd .75 ;;The ant ends by moving forward one step
set wfood foodc-of max-one-of neighbors [foodc] * (.05 * gradiant-degree + .94);;Reduces the ant's chemical strength
if foodc-of patch-here < wfood ;;Updates the chemical on the ant's patch
  [set foodc-of patch-here wfood]
end

to search-for-food ;;Ants will go and search for food if they have none
ifelse any? food-on patch-here ;;Is there food on this patch
  [ 
  if not (infinite-food) ;;As long as infinite-food is not on the food source will get smaller
  [
    ask one-of food-on patch-here
      [set ffood ffood - 5]
  ]
  set havefood? true ;;The ant has food, resets its chemical and turns for home
  set whome 0
  rt 180
  ]
  [
  ifelse any? food-on neighbors ;;Is there food on a neighboring patch?
    [
    set heading towards one-of food-on neighbors ;;If so move towards it
    wiggle ;;Keeps the ants from moving strictly at 45 degree angles
    ]
    [
    let pos1 patch-left-and-ahead 45 1 ;;Examines the three front patches and finds the strongest chemical
    let pos2 patch-right-and-ahead 45 1
    if foodc-of pos2 > foodc-of pos1
      [set pos1 pos2]
    if foodc-of pos1 > foodc-of patch-ahead 1
      [set heading towards pos1]
    ifelse foodc-of pos1 = foodc-of patch-ahead 1 ;;If all the patches are the same it will not turn
      [
      rt random 45
      lt random 45
      ]
      [
      wiggle
      ]
    check-wrapping ;;Makes sure the ant does not wrap around the screen
    ]
  ]
fd .75 ;;The ant ends by moving forward one step
set whome homec-of max-one-of neighbors [homec] * (.05 * gradiant-degree + .94);;Reduces the ant's chemical strength
if homec-of patch-here < whome ;;Updates the chemical on the ant's patch
  [set homec-of patch-here whome]
end


to go-patches ;;Tells the patches what to do on each time step
diffuse foodc diffusion * .1 ;;Causes the chemicals to difuse and bleed to adjacent patches
diffuse homec diffusion * .1
ask patches
[
set foodc foodc * (1 - evaporation * .01) ;;Accounts for any evaporation in the model
set homec homec * (1 - evaporation * .001)
if foodc > 100 ;;sets upper and lower limits on the value of the chemical strength
  [set foodc 100]
if homec > 100
  [set homec 100]
if foodc < .5
  [set foodc 0]
if homec < .5
  [set homec 0]
if view = "Food-chem" or (view = "Both" and foodc > homec) ;;Colors the patches acording to the current view setting
  [if not wall? [set pcolor 60 + ((foodc / 100) * 9)]]
if view = "Home-chem" or (view = "Both" and foodc < homec)
  [if not wall? [set pcolor 90 + ((homec / 100) * 9)]]
if view = "None"
  [if not wall? [set pcolor 0]]
if (wall? or abs pxcor > screen-edge-x - 1 or abs pycor > screen-edge-y - 1)
  [
  set foodc 0
  set homec 0
  ]
]
end

to-report new-random-color ;;Used to generate new colors for the hives and ants in each model
let temp (((1 + random 13) * 10) + (3 + random 6))
while [any? hive with [color = temp]]
[
set temp (((1 + random 13) * 10) + (3 + random 6))
]
report temp
end

to-report random-x ;;Generates a random x value acording to the screen size
report random (screen-size-x - 2) - (screen-edge-x - 1)
end

to-report random-y ;;Generates a random y value acording to the screen size
report random (screen-size-y - 2) - (screen-edge-y - 1)
end

to-report now-food ;;Used to report the food level of the hive to the graph in the interface
report (hfood-of one-of hive)
end

to wiggle ;;Keeps ants from moving strictly at 45 degree angles
lt random 15
rt random 15
end

to check-wrapping ;;Keeps ants from wrapping around the screen
while[wall?-of patch-ahead 1 or abs pxcor-of patch-ahead 1 > screen-edge-x - 1 or abs pycor-of patch-ahead 1 > screen-edge-y - 1]
[
ifelse (random 2 < 1)
[
while [wall?-of patch-ahead 1 or abs pxcor-of patch-ahead 1 > screen-edge-x - 1 or abs pycor-of patch-ahead 1 > screen-edge-y - 1]
[
rt 30
]
]
[
while [wall?-of patch-ahead 1 or abs pxcor-of patch-ahead 1 > screen-edge-x - 1 or abs pycor-of patch-ahead 1 > screen-edge-y - 1]
[
lt 30
]
]
]
end

to-report report-clock ;;Reports the clock variable to the display on the interface
report clock
end

to test-1
ca ;;Clear all: resets the world
set clock 0 ;;A clock variable used time things
set de-wall false ;;A variable used in the third custom setup
set evap? true
setup-shapes ;;Assigns shapes for the various turtle breeds
setup-patches ;;Sets up the patches
setup-hive ;;Sets up the hive and ant turtle breeds
create-custom-food 1
[setxy 15 -25]
create-custom-food 1
[setxy -15 -5]
create-custom-food 1
[setxy -30 25]
create-custom-food 1
[setxy 35 10]
create-custom-food 1
[setxy 0 35]
ask food
[
set color green ;;Leaves are green...duh
set ffood food-val ;;each piece of food has an amount of food set by food-val
set size sqrt (ffood / 25) ;;food sources get smaller as they are depleted
]
end

to setup-1 ;;A custom setup for the first Deneuborg and Co. Double-Bridge Experiment
ca
set clock 0
set de-wall false
set fixed-position? true
set evap? false
set food-start 1
setup-shapes

ask patches
[set wall? false]
let temp 0
create-custom-builder 1
  [
  setxy -5 -35
  set heading 0
  set btime 20
  ]
create-custom-builder 1
  [
  setxy 5 -35
  set heading 0
  set btime 20
  ]
create-custom-builder 1
  [
  setxy -5 -35
  set heading 90
  set btime 10
  ]
create-custom-builder 1
  [
  setxy -5 -15
  set heading 300
  set btime 30
  ]
create-custom-builder 1
  [
  setxy 5 -15
  set heading 60
  set btime 30
  ]
create-custom-builder 1
  [
  setxy -30 0
  set heading 45
  set btime 33
  ]
create-custom-builder 1
  [
  setxy 30 0
  set heading 315
  set btime 33
  ]
create-custom-builder 1
  [
  setxy -5 23
  set heading 0
  set btime 15
  ]
create-custom-builder 1
  [
  setxy 5 23
  set heading 0
  set btime 15
  ]
create-custom-builder 1
  [
  setxy -5 37
  set heading 90
  set btime 10
  ]
create-custom-builder 1
  [
  setxy 0 -7
  set heading 60
  set btime 18
  ]
create-custom-builder 1
  [
  setxy 0 -7
  set heading 300
  set btime 18
  ]
create-custom-builder 1
  [
  setxy -15 2
  set heading 45
  set btime 20
  ]
create-custom-builder 1
  [
  setxy 15 2
  set heading 315
  set btime 20
  ]
create-custom-builder 1
  [
  setxy 0 15
  set heading 0
  set btime 1
  ]
ask builder
  [
  while [btime > 0]
    [
    ask patch-here
      [
      set wall? true
      ask neighbors [set wall? true]
      ]
    if(abs pxcor-of patch-ahead 1 > screen-edge-x - 1 or abs pycor-of patch-ahead 1 > screen-edge-y - 1)
      [rt 180]
    fd 1
    set btime btime - 1
    ]
  die
  ]
set temp temp + 1
ask patches
[if (wall?) [set pcolor 9]]

setup-hive
setup-food
end

to setup-2 ;;A custom setup for the second Deneuborg and Co. Double-Bridge Experiment
ca
set clock 0
set de-wall false
set fixed-position? true
set evap? false
set food-start 1
setup-shapes

ask patches
[set wall? false]
let temp 0
create-custom-builder 1
  [
  setxy -5 -35
  set heading 0
  set btime 20
  ]
create-custom-builder 1
  [
  setxy 5 -35
  set heading 0
  set btime 20
  ]
create-custom-builder 1
  [
  setxy -5 -35
  set heading 90
  set btime 10
  ]
create-custom-builder 1
  [
  setxy -5 -15
  set heading 315
  set btime 22
  ]
create-custom-builder 1
  [
  setxy 5 -15
  set heading 75
  set btime 35
  ]
create-custom-builder 1
  [
  setxy 38 -5
  set heading 0
  set btime 10
  ]
create-custom-builder 1
  [
  setxy -20 2
  set heading 30
  set btime 30
  ]
create-custom-builder 1
  [
  setxy 38 4
  set heading 300
  set btime 37
  ]
create-custom-builder 1
  [
  setxy -5 23
  set heading 0
  set btime 15
  ]
create-custom-builder 1
  [
  setxy 5 23
  set heading 0
  set btime 15
  ]
create-custom-builder 1
  [
  setxy -5 37
  set heading 90
  set btime 10
  ]
create-custom-builder 1
  [
  setxy 0 -7
  set heading 75
  set btime 28
  ]
create-custom-builder 1
  [
  setxy 0 -7
  set heading 315
  set btime 13
  ]
create-custom-builder 1
  [
  setxy -10 2
  set heading 30
  set btime 16
  ]
create-custom-builder 1
  [
  setxy 26 0
  set heading 300
  set btime 30
  ]
create-custom-builder 1
  [
  setxy 0 15
  set heading 0
  set btime 1
  ]
ask builder
  [
  while [btime > 0]
    [
    ask patch-here
      [
      set wall? true
      ask neighbors [set wall? true]
      ]
    if(abs pxcor-of patch-ahead 1 > screen-edge-x - 1 or abs pycor-of patch-ahead 1 > screen-edge-y - 1)
      [rt 180]
    fd 1
    set btime btime - 1
    ]
  die
  ]
set temp temp + 1
ask patches
[if (wall?) [set pcolor 9]]

setup-hive
setup-food
end

to setup-3 ;;A custom setup for the third Deneuborg and Co. Double-Bridge Experiment
ca
set clock 0
set de-wall true
set fixed-position? true
set evap? false
set food-start 1
setup-shapes

ask patches
[set wall? false]
let temp 0
create-custom-builder 1
  [
  setxy -5 -35
  set heading 0
  set btime 20
  ]
create-custom-builder 1
  [
  setxy 5 -35
  set heading 0
  set btime 20
  ]
create-custom-builder 1
  [
  setxy -5 -35
  set heading 90
  set btime 10
  ]
create-custom-builder 1
  [
  setxy -5 -15
  set heading 315
  set btime 22
  ]
create-custom-builder 1
  [
  setxy 5 -15
  set heading 75
  set btime 35
  ]
create-custom-builder 1
  [
  setxy 38 -5
  set heading 0
  set btime 10
  ]
create-custom-builder 1
  [
  setxy -20 2
  set heading 30
  set btime 30
  ]
create-custom-builder 1
  [
  setxy 38 4
  set heading 300
  set btime 37
  ]
create-custom-builder 1
  [
  setxy -5 23
  set heading 0
  set btime 15
  ]
create-custom-builder 1
  [
  setxy 5 23
  set heading 0
  set btime 15
  ]
create-custom-builder 1
  [
  setxy -5 37
  set heading 90
  set btime 10
  ]
create-custom-builder 1
  [
  setxy 0 -7
  set heading 75
  set btime 28
  ]
create-custom-builder 1
  [
  setxy 0 -7
  set heading 315
  set btime 13
  ]
create-custom-builder 1
  [
  setxy -10 2
  set heading 30
  set btime 16
  ]
create-custom-builder 1
  [
  setxy 26 0
  set heading 300
  set btime 30
  ]
create-custom-builder 1
  [
  setxy 0 15
  set heading 0
  set btime 1
  ]
  
create-custom-builder 1
  [
  setxy -4 -12
  set heading 0
  set btime 5
  ]
create-custom-builder 1
  [
  setxy -4 16
  set heading 0
  set btime 5
  ]
ask builder
  [
  while [btime > 0]
    [
    ask patch-here
      [
      set wall? true
      ask neighbors [set wall? true]
      ]
    if(abs pxcor-of patch-ahead 1 > screen-edge-x - 1 or abs pycor-of patch-ahead 1 > screen-edge-y - 1)
      [rt 180]
    fd 1
    set btime btime - 1
    ]
  die
  ]
set temp temp + 1
ask patches
[if (wall?) [set pcolor 9]]

setup-hive
setup-food
end
@#$#@#$#@
GRAPHICS-WINDOW
190
10
658
499
44
44
5.15
1
10
1
1
1
0
1
1
1

CC-WINDOW
5
513
989
608
Command Center
0

BUTTON
108
228
180
261
Setup
setup
NIL
1
T
OBSERVER
T
S

BUTTON
115
409
178
442
Go
go
T
1
T
OBSERVER
T
G

SLIDER
10
10
182
43
Food-Start
Food-Start
1
30
4
1
1
NIL

SLIDER
9
80
181
113
Num-Walls
Num-Walls
0
10
0
1
1
NIL

SLIDER
9
117
181
150
Num-Ants
Num-Ants
0
300
150
1
1
NIL

SLIDER
9
264
181
297
Diffusion
Diffusion
0
1
0.01
0.01
1
NIL

SWITCH
8
154
181
187
Fixed-Position?
Fixed-Position?
1
1
-1000

CHOOSER
668
19
808
64
View
View
"None" "Food-chem" "Home-chem" "Both"
1

SLIDER
9
300
183
333
Evaporation
Evaporation
0
5
2.5
0.1
1
NIL

PLOT
669
83
980
317
Food Rate
Time
Food in Hive
0.0
10.0
0.0
10.0
true
false

BUTTON
813
10
868
43
NIL
set View "None"
NIL
1
T
OBSERVER
T
N

BUTTON
870
10
925
43
NIL
set View "Home-chem"
NIL
1
T
OBSERVER
T
H

BUTTON
813
45
868
78
NIL
set View "Food-chem"
NIL
1
T
OBSERVER
T
F

BUTTON
871
45
926
78
NIL
set View "Both"
NIL
1
T
OBSERVER
T
B

BUTTON
667
328
769
361
Custom 1
Setup-1
NIL
1
T
OBSERVER
T
NIL

BUTTON
785
329
887
362
Custom 2
setup-2
NIL
1
T
OBSERVER
T
NIL

BUTTON
786
370
888
403
Custom 3
setup-3
NIL
1
T
OBSERVER
T
NIL

SLIDER
807
420
979
453
De-wall-val
De-wall-val
5
1500
1500
5
1
NIL

SWITCH
8
191
181
224
Fun-shapes
Fun-shapes
1
1
-1000

MONITOR
894
367
980
416
Clock Time
report-clock
3
1

SWITCH
8
372
180
405
Infinite-Food
Infinite-Food
1
1
-1000

TEXTBOX
667
414
807
478
The de-wall value sets the time step on which to remove the walls in Custom 3.

MONITOR
894
316
980
365
Hive Food
now-food
0
1

SLIDER
9
45
181
78
Food-val
Food-val
25
1000
1000
25
1
NIL

SLIDER
8
336
181
369
Gradiant-Degree
Gradiant-Degree
0
1
1.0
0.1
1
NIL

BUTTON
663
369
777
402
Evaporation Test
test-1
NIL
1
T
OBSERVER
T
NIL

@#$#@#$#@
WHAT IS IT?
-----------
This is a model for the foraging of ants.


HOW IT WORKS
------------
This model works on a system of two chemicals.  When an ant steps on a hive or foodsource it will recieve a "boost" of home or food chemical, respectively.  As it walks away from that hive or foodsource the strength of this chemical will diminish.  At each step the ant checks its chemical value versus that of the patch it is on.  If the chemical of the ant is greater than the patch then the ant will "lay the pheromone," raising the patches chem value to match its own.

Ants that do not have food will follow the food chemical to find some and those that are carrying food wil follow the home chemical to return to the hive.


HOW TO USE IT
-------------
(Starting from top left, going down, and then top right, going down)

Food-Start slider:
This slider adjusts the number of food sources in the model.

Num-Walls slider:
This slider adjusts the number of walls in the model.  It is possible (but unlikely) that the food or ant hill will get walled in.

Num-Ants slider:
This slider adjusts the number of ants present in the model.

Single-food? toggle:
This toggle will automatically set the Food-Start slider to one and give the food and hill a fixed starting location (when off, the food will spawn randomly).

Fun-shapes toggle:
This toggle will assign random shapes to the ants, food, and hill.

Setup button:
This button will setup the model with the parameters specified with the sliders above.

Difusion slider:
This slider will affect the rate at which the home and food chemicals spread to adjacent patches.

Evaporation slider:
This slider will affect the rate at which the home and food chemicals evaporate.

Gradiant-degree slider:
This slider will affect the distance from the hive and food sources that the chemicals will reach.

Infinite-food? toggle:
When activated, food sources will not get smaller.

Go button:
This button begins the model.  Press it again to turn the model off.

View selector:
This selector toggles between displaying the food chemical, the home chemical, both, or neither.

View buttons:
These buttons do the same thing as the view selevtor but are linked to the keyboard keys 'F', 'G', 'B", and 'N'.

Food rate graph:
This graph displays the time on teh x-axis and the amount of food in the ant hill on the y axis.  The graph automatically redefines its domain and range as necesary.

Custom buttons:
These buttons simulate three "double-bridge" experiments performed by Deneuborg and coleagues in 1997.

De-wall-val slider:
This slider sets the clock step at which the walls will be removed from the third custom experiment.


THINGS TO NOTICE
----------------
This section could give some ideas of things for the user to notice while running the model.


THINGS TO TRY
-------------
This section could give some ideas of things for the user to try to do (move sliders, switches, etc.) with the model.


EXTENDING THE MODEL
-------------------
One thing that I was not entirely able to balance was the diffusion and evaporation of chemicals.  I found that if  the evaporation rate was too high than the ants were unable to form a trail.  If the evaporation rate was low enough to form a trail then the chemical also lingered long after the food source has been depleted, which made it difficult to work with models with multiple food sources.

The diffusion method in the NetLogo library was not entirely what I was looking for in its operation (see NetLogo features for more info) but when I tried to create my own method the performance of my model slowed down dramatically, so I stuck with the built in method.  I have a feeling that diffusion and evaporation methods combined are partially self sustaining, which is why the chemical lingers for so long.

A deeper investigation into the diffusion and evaporation of the chemicals in this model and a possible fix would allow for analysis of multiple food source models with much greater eficiency (not waiting for an hour for chemicals to fade).


NETLOGO FEATURES
----------------
This section could point out any especially interesting or unusual features of NetLogo that the model makes use of, particularly in the Procedures tab.  It might also point out places where workarounds were needed because of missing features.


RELATED MODELS
--------------
Some other related models in the NetLogo library include the antlines model, which demonstrates the optimization of ant following behavior, and the ant foraging model, which demonstrates the use of pheromones for ant foraging.


CREDITS AND REFERENCES
----------------------
My Model: http://tjhsst.edu/~sjohnson/NetLogo%20Work/Ants/Ants%20v3.nlogo
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NetLogo 3.0
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