kitties.nlogo

globals[ grass-per mice-per ]

breed[mice mouse]
breed[cats cat]

patches-own[countdown]
mice-own[max-energy energy mycat life]
cats-own[max-energy energy target life]

to setup
  ca
  set mice-per .75
; initialize landscape to brown earth
  ask patches
  [
    set pcolor 37
  ]

; initialize grass
  ask n-of num-grass-clumps patches
  [
   ask n-of 60 patches in-radius 5
    [
      set pcolor 54
    ]
   ]
  
; initialize holes
  ask n-of num-holes patches
  [
   set pcolor 33
  ]

; create mice
  create-mice num-mice
  [
   set size 0.6
   set shape "circle"
   set color white
   setxy random-xcor random-ycor
   set max-energy 20
   set energy 10
   set mycat 0
   set life 10
  ]

; create cats
  create-cats num-cats
  [
   set size 0.8
   set shape "circle 2"
   set color black
   setxy random-xcor random-ycor
   set max-energy 100
   set energy 50
   set life 30
  ]
  
  ask mice
  [
    move-to min-one-of (patches with [pcolor = 33]) [distance myself]
  ]
  
  ask cats
  [
    set target min-one-of mice with [mycat < 2] [distance myself]
    ask target [ set mycat mycat + 1 ]
  ]

end ;end setup

  
; main procedure
to go
  if not any? mice [stop]
  if not any? cats [stop]
  
  ask mice
  [
    if count mice-here > 5 [die]
   flee-forage
   reproduce-mice
   agent-die
   set life life - 1
  ]
  
  ask cats
  [
    if count cats-here > 2 [die]
   chase
   reproduce-cats
   cat-die
   set life life - 1
  ]
  
  ask patches
  [
    patch-grow
  ]
  
  do-plot
  tick
  
end ; end go main procedure
  
  
;mice procedures
to flee-forage
  let predator one-of cats with [distance myself < safe-radius]
  if predator != nobody
  [
    if pcolor = 33
    [
      move-to one-of patches with [pcolor = 33]
      stop
    ]
    set heading towards min-one-of patches with [pcolor = 33] [distance myself]
    fd 1
    set energy energy - 1
    stop
  ]
  
  if pcolor = 54
  [
    set energy energy + grass-energy
    set pcolor 37
    ask patch-here [set countdown 4]
  ]
  
  set energy energy - 1
  rt random 50
  lt random 50
  fd 1
end

to reproduce-mice
  if energy >= max-energy
  [
    set energy energy / 2
    hatch 2
    [
      set life 10
      set mycat 0
      fd 2
    ]
  ]
end



;cats procedures
to chase
  if target = nobody
  [
    set target min-one-of mice with [mycat < 2] [distance myself]
    if target = nobody [ fd 2 stop] ;if there are no mice without target, just wander around for a bit 
    ask target [ set mycat mycat + 1 ]
  ]
  
  ;kitty looses interest if target reaches a hole
  let temp yellow ;get color target is on -> want to check if its a hole
  ask target [ set temp pcolor ]
  if pcolor = 33
  [
    ask target [ set mycat mycat - 1 ]
    set target min-one-of mice with [mycat < 2] [distance myself]
    if target = nobody [ fd 2 stop ] ;if there are no mice without target, just wander around for a bit 
    ask target [ set mycat mycat + 1 ]
  ]
  
  if distance target < safe-radius
  [
    set energy energy + ([energy] of target) * mice-per
    ask target [ die ]
    stop
  ]
  
  set energy energy - 1
  set heading towards target
  fd 2
end

to agent-die

  if energy <= 0 [ die ]
end

to cat-die
  if energy <= 0 [ die ]
  if life <= 0 [ die ]
end

to reproduce-cats
  if energy >= max-energy
  [
    let litter-size random max-litter
    if litter-size = 0
    [
      set litter-size 1
    ]
    set energy 30
    hatch litter-size 
    [
      set life 30
      set target nobody
      fd 1
    ]
  ]
end

to patch-grow
  if pcolor = 37
  [
    set countdown countdown - 1
    if countdown = 0
    [
      set pcolor 54
    ]
  ]
end

to do-plot
  set-current-plot "Populations"
  set-current-plot-pen "cats"
  plot count cats
  set-current-plot-pen "mice"
  plot count mice
  set-current-plot-pen "grass"
  plot count patches with [pcolor = 54] / 4
end


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@#$#@#$#@
WHAT IS IT?
-----------
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HOW IT WORKS
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THINGS TO TRY
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EXTENDING THE MODEL
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NETLOGO FEATURES
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