问题描述
我只想删除模型运行中途的乌龟笔线. 清除图"原语似乎可以达到此目的，但是我的问题是我无法直接从代理运行它，也无法使用询问观察者[清除图]".有没有一种方法可以从代理程序上下文中触发此观察者命令(我希望不会)，或者还有另一种擦除乌龟笔线的方法?我使用背景颜色的笔重新绘制的解决方案是垃圾.
I want to delete only turtle pen lines from a halfway point in a model run. The "clear-drawing" primitive seems to achieve that, but my problem is that I can't run it directly from an agent, or use "ask observer [clear-drawing]". Is there a way to trigger this observer command from an agent context (I expect not), or is there another way of erasing turtle pen lines? My solution to re-draw using pens having the background color is rubbish.
推荐答案
使用pen-erase代替使用背景色进行重绘.如果这同样是垃圾"，也许您想要更多类似此处的答案? NetLogo乌龟留下的踪迹随着时间的流逝而消失
Instead of redrawing using the background color, use pen-erase. If that's equally "rubbish", perhaps you want something more like the answers here? NetLogo turtles leaving a trail that fades with time
关于clear-drawing仅是观察者，看来工作起来应该不太困难，例如:
About clear-drawing being observer-only though, that seems like it shouldn't be too hard to work around, something like:
to go
let clear? false
ask turtles [
...
if ... [
set clear? true
]
...
]
if clear? [ clear-drawing ]
tick
end
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