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Interpolation between keyframes of an event-based label row. A non-hold upsert runs into the geometry of the object’s next event when that event is an upsert (before a delete it holds) and nothing is stored in between, so the formulas here are the label: they mirror the editor’s (cord-frontend labels/events/linear.ts, via three.js) and must not change. A new rule is a new mode.

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InterpolationMode

"hold": the geometry stands until the next event (what an unset field means). "linear": it moves in a straight line, over time, into the next upsert’s.

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INTERPOLATED_CONFIDENCE

Confidence of a derived frame, matching the editor.

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INTERPOLATION_SHAPES

The shapes each non-hold mode supports. hold supports every shape.

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check_interpolation_supported

Raise unless mode is readable on shape (a Shape or its value). Raises:
  • ValueError - For an unknown mode, or a mode the shape does not support.

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interpolate

start a fraction of the way to end under mode, or None where it holds.