如果特定乌龟遇到特定色块，如何更改其颜色？

Question

有一个白色的斑点，随机移动着10只红海龟和10只蓝海龟。如果蓝色乌龟出现在白色斑块上，我想将一只乌龟的颜色更改为红色。如果另一只蓝色乌龟出现在白色斑块上，我也想将该特定乌龟的颜色也更改为红色。同样。

我为此编写了代码。 （我可以在代码中更改补丁数量，包括蓝色和红色乌龟。首先，只有绿色补丁。当一只红色乌龟进入绿色补丁时，绿色补丁变成白色。我想编写一个代码，使一只蓝龟变成白色斑块，然后蓝龟变成红色）。不幸的是，在我的代码中，如果一只蓝色的乌龟来到了白色的补丁上，那么所有的蓝龟都变成了红色！我想将一只乌龟的颜色改为红色。谢谢！

breed [cows cow]       ;Infected mosquitos
breed [sheep a-sheep]  ;Susceptible-Mosquitos

to setup
  clear-all
  set-default-shape cows "bug"
  set-default-shape sheep "bug"
  reset-ticks

  create-cows  Infected-Mosquitos-red ; cows=Infected mosquitos
   [
    set color red
   ]

create-sheep Susceptible-Mosquitos-blue
  ; sheep=Susceptible mosquitos
   [
    set color blue
   ]

ask turtles [
    set size 1
    set shape "bug"
    setxy random-xcor random-ycor
     ]

ask turtles[
      ifelse coin-flip?
          [ifelse coin-flip? [set heading 0][set heading 90]]
          [ifelse coin-flip? [set heading 180][set heading 270]]
     ]

ask n-of humans patches [set pcolor green]

   show Infected-Mosquitos-red
   show Susceptible-Mosquitos-blue

end

to go
  ask turtles
    [
       ifelse coin-flip?
          [ifelse coin-flip? [set heading 0][set heading 90]]
          [ifelse coin-flip? [set heading 180][set heading 270]]
       forward 1
      ask cows[
      if pcolor = green
          [
            set pcolor white
          show ticks
          ]
        ]
      ask sheep[
        if pcolor = white
          [
            ask sheep[
            set color red
            ]
        ]
    ]
  ]
    tick
end


to-report coin-flip?
  report random 2 = 0
end

我希望只有特定乌龟的颜色才能从白色变为蓝色