Similar to my "DollarChannel" script, this keeps track of lows and highs, but snaps a line whenever A) the high exceeds low+(low*ratio), or B) low falls under high-(high*ratio).
This results in a channel that tracks percent-changes rather than absolute dollar-value changes.
リリースノート
Added alerts when channel thresholds are crossed.
リリースノート
Update to v5 Add rising/falling alerts (can enable them independently) Fix signed-ness bug (now works with tickers like "0-VIX" (i.e. inverted)