If you do need to keep the entire history, then keep a BitmapData under your line (e. g. the size of the stage).

如果你做需要保持整个历史，然后保持BitmapData在你的线(如舞台的大小)。

youdao

If you do need to keep the entire history, then keep a BitmapData under your line (e. g. the size of the stage).

如果你做需要保持整个历史，然后保持BitmapData在你的线(如舞台的大小)。

youdao