Delete Me

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Jacy Cough (Author)

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Click to Run Model

breed [fishies fishie]
breed [sharkies sharkie]

fishies-own [scared]

to setup
  ca
  ask patches [ set pcolor blue ]
  create-fishies 500 [     
    set-fish-defaults   
    setxy random-xcor random-ycor
  ]
  reset-ticks
end   

to set-fish-defaults ;; fish proc
  set size 1.5
  set color orange
  set scared false
  set shape "fishie"
end 

to make-shark
  create-sharkies 1 [
    set size 10
    set color gray       
    set shape "sharkie open"
    setxy random-xcor random-ycor
    set heading 90
  ]
end 

to go
  every 0.5 [ ask sharkies [ change-shape ] ] 
  ask sharkies [
    if not any? fishies in-cone 10 30 [ rt 1 ]
    ask fishies-on patch-at-heading-and-distance heading 5 [ die ]
    fd shark-speed
  ]
  ask fishies [
    let theshark one-of sharkies in-radius fish-vision
    ifelse theshark != nobody [
      set scared true
      face theshark
      rt 180
      fd scared-fish-speed
    ][set scared false]
    ifelse scared [set color red ] [ set color orange ]
    wiggle
    if not scared [
      if any? fishies-here with [not scared] [
        if random 1000 < 1 [ 
          hatch 1 [
            set-fish-defaults
            setxy xcor ycor
          ]
        ]
      ]
    ]
    fd fish-speed
  ]
  tick
end 

to change-shape ;; sharkie procedure
  set shape ifelse-value shape = "sharkie open" ["sharkie closed"] ["sharkie open" ]
end 

to wiggle        ;; turtle procedure
  rt random 40 - random 40
end

There is only one version of this model, created over 14 years ago by Jacy Cough.

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