;;this is version 4
;;version 1--learn breeds
;;version 2--does energy level of ants
;;version 3--lays a trail of smells on the patches
;;version 4--To walk random for start-energy ticks, then find a shorter route home
;;version 5--more than one ant on walkabout and returning on a shorter path, but using other ant smells.



breed [ants ant]
breed [holes hole]
;;;breed [foods food]
ants-own [energy
  smell-ahead
  smell-right
  smell-left
  smell-ahead-right
  smell-ahead-left
  smell-behind-right
  smell-behind-left
  smell-behind
  smell-here
  smell-of-food
  ]
patches-own [
  smell
  food-taste
  ]
globals
[ stop-the-program
  number-of-ants-in-hole
  tk   ;replacing ticks
]


to setup
  ;; (for this model to work with NetLogo's new plotting features,
  ;; __clear-all-and-reset-ticks should be replaced with clear-all at
  ;; the beginning of your setup procedure and reset-ticks at the end
  ;; of the procedure.)
  ;;__clear-all-and-reset-ticks
  clear-all
  create-ants number-of-ants
  create-holes 1
  set tk 0
;;  create-foods 1
  ask patches
  [
    set smell 0
    ask patch 0 0 [ set smell start-energy ]
    ask patch 45 40 [ set food-taste 100 ]
    
    ;;set plabel food-taste
  ]
;;;diffuse food-taste .99

  ask ants 
  [ 
     set color red
    set shape "bug"
    set size 5
    setxy 0 0 
    set energy start-energy
   
  ]
  
  ask holes 
  [
     setxy 0 0 
    set pcolor black
    set color brown
    set shape "circle"
    set size 6
    stamp
   ;;die
    ]
  
 ;; ask foods
 ;; [
   ;; setxy 45 40
    ;;set pcolor black
    ;;set color blue
    ;;set shape "circle"
    ;;set size 4
    ;;stamp
   ;; ]
  reset-ticks
end


to go
  set tk (tk + 1)
  if (stop-the-program = 1)
  [
    stop
  ]
  
  ask ants
  [    ;;Checks the energy level and decides what to do depending on it
    pen-down
    if (who > TK ) [stop]  ;;this releases ants one at a time
           if energy > 0  ;;ant is still on walk about
        
         [
           right random 90
           left random 90
          forward 1 
          set energy energy - 1
        ;;  set label energy
          if energy > smell
          [
          set smell energy
    ;;      ifelse show-smells?
    ;;      [ set plabel smell ]
    ;;      [ set plabel "" ]
       ;;   set plabel smell
          ]
          
         ]
         
 
            if energy = 0 ;;and has reached the end of his walkabout
          [ 
            set color blue
            rt 180
            set energy energy - 1
          ]
  
                  if energy < 0  ;; ant is on his way back to the nest
                 [
                          set energy energy - 1
                          set smell-here sh
                          set smell-ahead sa
                          set smell-ahead-right sar
                          set smell-right sr
                          set smell-ahead-left sal
                          set smell-left sl
                          set smell-behind-left sbl
                          set smell-behind-right sbr
                          set smell-behind sb
                          
                    if (sh = start-energy) 
                    [
                      set number-of-ants-in-hole (number-of-ants-in-hole + 1)
                      if (number-of-ants-in-hole = number-of-ants)
                      [set stop-the-program 1]
                      die
                      stop  
                    ]
                    
                     if (sh >= sa) and  (sh >= sr) and (sh >= sl) and (sh >= sal) and (sh >= sar) and (sh >= sbl) and (sh >= sbr) and (sh >= sb)
                          [
                          right random 80
                          left random 80
                        ;;    set label "R"
                          forward 1 
                          stop
                         ]
                          
                    if (sh <= sa) and (sa >= sr) and (sa >= sl) and (sa >= sal) and (sa >= sar) and (sa >= sbl) and (sa >= sbr) and (sa >= sb)
                    
                       [
                       ;;  set label "S"
                         forward 1
                         stop
                       ]
                      
                      if (sh <= sar) and (sar >= sr) and (sar >= sl) and (sar >= sal) and (sar >= sa) and (sar >= sbl) and (sar >= sbr) and (sar >= sb)
                         [
                       ;;  set label "RA"
                         rt 45
                         forward 1
                         stop
                         ]
                        if (sh <= sal) and (sal >= sr) and (sal >= sl) and (sal >= sa) and (sal >= sar) and (sal >= sbl) and (sal >= sbr) and (sal >= sb)
                         [
                         ;;  set label "LA"
                         left 45
                         forward 1
                         stop
                         ]
                         
                      if (sh <= sr) and (sr >= sa) and (sr >= sl) and (sr >= sal) and (sr >= sar) and (sr >= sbl) and (sr >= sbr) and (sr >= sb)
                         [
                        ;; set label "R"
                         rt 90
                         forward 1
                         stop
                         ]
                        if (sh <= sl) and (sl >= sr) and (sl >= sa) and (sl >= sal) and (sl >= sar) and (sl >= sbl) and (sl >= sbr) and (sl >= sb)
                         [
                         ;;  set label "L"
                         left 90
                         forward 1 
                         stop
                         ]
                         if (sh <= sbr) and (sbr >= sr) and (sbr >= sl) and (sbr >= sal) and (sbr >= sar) and (sbr >= sbl) and (sbr >= sa) and (sbr >= sb)
                         [
                       ;;  set label "RB"
                         rt 135
                         forward 1
                         stop
                         ]
                        if (sh <= sbl) and (sbl >= sr) and (sbl >= sl) and (sbl >= sal) and (sbl >= sar) and (sbl >= sa) and (sbl >= sbr) and (sbl >= sb)
                         [
                       ;;    set label "LB"
                         left 135
                         forward 1
                         stop
                         ]
                          if (sh <= sb) and (sb >= sr) and (sb >= sl) and (sb >= sal) and (sb >= sar) and (sb >= sbl) and (sb >= sbr) and (sb >= sa)
                         [
                        ;;   set label "B"
                         left 180
                         forward 1 
                         stop
                         ]
                     
                  
                   ]
               
  ]   
  
  end

to-report this-taste
  let p patch-here
  report [food-taste] of p
end
to-report sh
  let p patch-here
  report [smell] of p
end
to-report sa
  let p patch-ahead 1
  report [smell] of p
end
to-report sar
  let q patch-right-and-ahead 45 1
  report [smell] of q
end
to-report sal
  let r patch-left-and-ahead 45 1
  report [smell] of r
end
to-report sr
  let s patch-right-and-ahead 90 1
  report [smell] of s
end
to-report sl
  let t patch-left-and-ahead 90 1
  report [smell] of t
end
to-report sbr
  let q patch-right-and-ahead 135 1
  report [smell] of q
end
to-report sbl
  let r patch-left-and-ahead 135 1
  report [smell] of r
end
to-report sb
  let r patch-left-and-ahead 180 1
  report [smell] of r
end
@#$#@#$#@
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@#$#@#$#@
## WHAT IS IT?

This is a very simple model of some ants on a random walkabout starting at a nest. After the chosen number of steps (called start-energy), the ants will change color, and return to the nest following the outbound pathways, but by finding a shorter route.

## HOW IT WORKS

As the ants proceeds on their walkabout, they deposit a smell at each step. On their return journey, when they cross a path, they sense the smell intensity to determine which direction is closest to the nest.

## HOW TO USE IT

Use the "start-energy" slider to select how many outbound steps the ants will go before turning around and returning to the nest.  
Use the "number-of-ants" slider to select how many ants you want to go walkabout.  
Clicking on the "setup" button draws the nest and ants, and initializes all variables.  
Clicking on the "go" button starts the ants on their journey.  
At the top is a slider named "normal speed". This slider speeds up the program, or slows it down. If it set to slow, the setup period can get long. You can always slide the "normal speed" slider towrds a faster selection for the setup, the move it to a slower setting before clicking the "go" button

## THINGS TO NOTICE

An ant smells only in 8 different directions. If it is in the corner of one of the patches, then he may move diagonaly, and still end up in the same patch. The next step can then divert him off the return path at a steep angle.

## THINGS TO TRY

Vary the speed to see the results quicker. 

## EXTENDING THE MODEL

The next addition will be to have the ant search for, and find food, then return to the nest via the shortest route.

## NETLOGO FEATURES

I didn't use the "uphill" command because the ant stops if a surrounding patch is not of a higher value than where he is. I wanted him to chose a path regardless.
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