Netlogo complete

breed [ points point ]
breed [ walkers walker ]

to setup
  clear-all

  create-points 1 [ draw-point 1 1 ] ;; Zombie
  create-points 1 [ draw-point 10 10 ] ;; Human

  create-walkers 1[
    set color red
    set size 1
  ]

  reset-ticks
end

to play

  ask walker 2[
    set color green
    pen-down

    let dir 0 ; 0 - y direction 1 - x direction
    let dist 0
    let total-dist 0
    let first-time 1
    let p-dir -1 ; previous direction

  ]

  tick
end

to plot-manhattan-distance
  type "Manhattan Distance: "
  ask walker 2
  [ set color one-of [ white yellow sky lime magenta orange turquoise pink ]
    pen-up
    setxy [xcor] of point 0 [ycor] of point 0
    pen-down

    let x [xcor] of point 0
    let y [ycor] of point 0
    let dir 0    ; 0 if moving in y direction, 1 if in x direction
    let dist 0
    let total-dist 0
    let first-time 1
    let p-dir -1 ; previous direction

    while [x != [xcor] of point 1 or y != [ycor] of point 1]
    [
      ifelse (x = [xcor] of point 1)
      [
        set y y + 2
        set dir 0
      ]
      [
        ifelse (y = [ycor] of point 1)
        [
          set x x + 2
          set dir 1
        ]
        [
          ifelse (random 2 = 0)
          [
            set x x + 2
            set dir 1
            ]
          [
            set y y + 2
            set dir 0
            ]
        ]
      ]

      set total-dist total-dist + 2

      setxy x y
      ifelse (p-dir = -1)
      [ set p-dir dir
        set dist 2 ]
      [ ifelse (p-dir = dir) ; changed direction?
        [ set dist dist + 2 ]
        [ ; changed direction
          ifelse (first-time = 1)
          [ set first-time 0 ]
          [ type " + " ]
          type dist
          set dist 2
          set p-dir dir
        ]
      ]
    ]
    if (first-time = 0)
      [ type " + " ]
    type dist type " = "
    print total-dist
  ]
end


to draw-point [x y]
  set color white
  set shape "circle"
  setxy x y
  set size 1
end

to-report manhattan-distance [x y x1 y1]
  report abs (x1 - x) + abs (y1 - y)
end
@#$#@#$#@
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ticks
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BUTTON
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Setup
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OBSERVER
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BUTTON
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OBSERVER
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BUTTON
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NIL
plot-manhattan-distance\n
NIL
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T
OBSERVER
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NIL
NIL
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1

@#$#@#$#@
## WHAT IS IT?

(a general understanding of what the model is trying to show or explain)

## HOW IT WORKS

(what rules the agents use to create the overall behavior of the model)

## HOW TO USE IT

(how to use the model, including a description of each of the items in the Interface tab)

## THINGS TO NOTICE

(suggested things for the user to notice while running the model)

## THINGS TO TRY

(suggested things for the user to try to do (move sliders, switches, etc.) with the model)

## EXTENDING THE MODEL

(suggested things to add or change in the Code tab to make the model more complicated, detailed, accurate, etc.)

## NETLOGO FEATURES

(interesting or unusual features of NetLogo that the model uses, particularly in the Code tab; or where workarounds were needed for missing features)

## RELATED MODELS

(models in the NetLogo Models Library and elsewhere which are of related interest)

## CREDITS AND REFERENCES

(a reference to the model's URL on the web if it has one, as well as any other necessary credits, citations, and links)
@#$#@#$#@
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@#$#@#$#@
NetLogo 5.0.2
@#$#@#$#@
@#$#@#$#@
@#$#@#$#@
@#$#@#$#@
@#$#@#$#@
default
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@#$#@#$#@
0
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