Functions

Import these from @grafloria/engine.

Functions

bumpMutationEpoch

Bump the epoch by hand, for a mutation that legitimately bypasses markDirty() (in-place points rewrites, say). Prefer markDirty().

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function bumpMutationEpoch(): number

distanceToSegment

Distance from p to the segment a→b. The primitive both hit-tests are built on.

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function distanceToSegment(p: Point, a: Point, b: Point): number

getMutationEpoch

Read the current mutation epoch. Cheap enough to call every frame.

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function getMutationEpoch(): number

hasPressure

True when the device gave us pressure worth keeping (i.e. it actually varies).

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function hasPressure(points: readonly StrokePoint[]): boolean

linkLabelPosition

The position along the path (0-1) a label resolves to.

slot WINS over position. Naming a slot is an explicit act; position is a required field that most slot users only fill in to satisfy the type, so letting it win would make slot silently do nothing.

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function linkLabelPosition(
  label: Pick<LinkLabel, 'position' | 'slot'>
): number

segmentDistance

Minimum distance between two SEGMENTS.

The eraser needs this and a point-test cannot replace it. A pointermove at 60Hz over a fast flick lands samples 80px apart; testing only the sample POINTS lets the eraser jump clean over a stroke it visibly swept through. So the eraser tests the segment it travelled, not the points it happened to land on.

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function segmentDistance(a1: Point, a2: Point, b1: Point, b2: Point): number