Function findTriggerCrossing

findTriggerCrossing(
    buffer: DataPoint[],
    fromIndex: number,
    settings: TriggerSettings,
    notBefore?: number,
): number
Finds the first threshold crossing at or after fromIndex.

Rising fires when the previous present value is at or below the threshold and the current one is above it; falling is the mirror. A crossing counts only if it is after notBefore and the buffer already holds the full pre-trigger window before it.
Parameters
- buffer: DataPoint[]
  Live buffer, sorted by time.
- fromIndex: number
  First index that may fire.
- settings: TriggerSettings
  Trigger settings.
- notBefore: number = Number.NEGATIVE_INFINITY
  Crossings at or before this time (Unix ms) are ignored.
Returns number
Index of the crossing sample, or -1.
- Defined in plot/trigger.ts:89