我有一个随机的蓝色边框和一个放在边框内的球，应该随机移动到内部，当它撞到墙壁时，它应该朝相反的方向转动并继续 . 为此，我写了一个代码

breed [ balls ball ]
ask balls
  [
    ifelse (pcolor = blue or [pcolor] of patch-at dx dy = blue)
    [  
     rt 180
    ]
    [
      jump 0.4
    ]
  ]

这段代码似乎有效，但现在需要在球击中墙壁时创建一个闪光灯 . 我尝试了以下代码 - 没有成功

breed [ flashes flash ]
flashes-own [ birthday ]

to apply-flash-visualization
  set size 2.5
  if (ticks - birthday > 0.4)  [ die ]
end

to go
  ask flashes [ apply-flash-visualization ]
  ask balls
  [
    ifelse (pcolor = blue or [pcolor] of patch-at dx dy = blue)
    [  
     rt 180
      if (pcolor = blue)
      [
        let bounce-patch patch-here
        let new-px [ pxcor ] of bounce-patch
        let new-py [ pycor ] of bounce-patch
        ask patch new-px new-py [
          sprout 1 [
            set breed flashes
            set color gray - 2
            set birthday ticks
          ]
        ]
      ]
    ]
    [
      jump 0.4
    ]
  ]

如何解决问题？谢谢

netlogo