囚徒困境代码与界面设计

下面是一个基于 NetLogo 的囚徒困境模型代码和界面设计：

globals [
  cooperate? ; 全局变量，表示是否合作
]

turtles-own [
  score ; 每个乌龟的得分
]

to setup
  clear-all
  reset-ticks
  set-default-shape turtles "person"
  set-patch-size 20
  ask patches [
    set pcolor white
  ]
  create-turtles 2 [
    setxy random-xcor random-ycor
    set color ifelse-value (who = 0) [ red ] [ blue ]
    set heading random 360
    set score 0
  ]
  set cooperate? true
  create-turtles 1 [
    setxy 0 min-pycor + 2
    set color green
    set label "Score: 0"
    set heading 90
  ]
end

to go
  ask turtles [
    if cooperate? [
      set score score + 2
    ] else [
      set score score + 3
    ]
  ]
  ifelse (cooperate?) [
    ask turtle 0 [
      ifelse-value (random-float 1 < 0.5) [
        set cooperate? true
      ] [
        set cooperate? false
      ]
    ]
    ask turtle 1 [
      ifelse-value (random-float 1 < 0.5) [
        set cooperate? true
      ] [
        set cooperate? false
      ]
    ]
  ] [
    ask turtle 0 [
      ifelse-value (random-float 1 < 0.5) [
        set cooperate? true
      ] [
        set cooperate? false
      ]
    ]
    ask turtle 1 [
      ifelse-value (random-float 1 < 0.5) [
        set cooperate? false
      ] [
        set cooperate? true
      ]
    ]
  ]
  tick
  ask turtle 2 [
    set label "Score: " + (score turtle 0 + score turtle 1)
  ]
end

这个代码与之前的代码相似，但是增加了一个额外的绿色乌龟，来显示两只囚徒的总得分。同时，这个代码还增加了一些界面设计，如设置了背景为白色，将乌龟和得分标签放置在不同的位置等。

你可以将这段代码保存为一个 NetLogo 文件，然后在 NetLogo 程序中打开运行。在运行时，你可以通过滑动时间步骤快进或回退，观察囚徒困境的演化过程，以及两只囚徒的得分变化。