-
handLandmarkConnections — exported constant listing the 21 skeleton
bone pairs for the MediaPipe hand topology. Iterate over it to draw a
skeleton overlay without hand-coding the connections yourself.
-
CanvasGestureEvent.confidence (double, default 1.0) — ML
confidence of the gesture classification. Always 1.0 on web (rule-based
heuristic); populated from the backend's score on native when using a
model-based LandmarkProvider such as hand_detection.
-
HandDetectionFrame.gestureConfidence / secondHandGestureConfidence
(double, default 1.0) — per-gesture confidence fields for native backends
to expose ML scores that flow through to CanvasGestureEvent.confidence.
-
GestureInputSource confidence thresholds (web) — three new constructor
params minHandDetectionConfidence, minHandPresenceConfidence, and
minTrackingConfidence (each default 0.5, matching MediaPipe defaults).
Tune these to trade sensitivity against false positives without modifying the
JS worker.
-
HandDetectionFrame.worldLandmarks / secondWorldLandmarks —
optional world-space landmark lists (metric scale, hand-centre origin) for
native backends to expose orientation-invariant landmark data. On web,
populated from MediaPipe's worldLandmarks result automatically.
-
GestureDebugInfo.worldLandmarks / secondWorldLandmarks — world
landmarks forwarded through the debug snapshot so overlays and classifiers
can consume them.
-
HandDetectionFrame.boundingBox / secondHandBoundingBox (Rect?)
— axis-aligned bounding box of each detected hand in normalised image
coordinates. Native backends set this from their ML model's output. On web,
computed automatically as the min/max envelope of the 21 image-space
landmarks.
-
GestureDebugInfo.boundingBox / secondHandBoundingBox (Rect?)
— bounding box forwarded through the debug snapshot for overlay rendering.
-
StylusInputSource — input source for Apple Pencil, Samsung S-Pen, and
any PointerDeviceKind.stylus / PointerDeviceKind.invertedStylus device.
Maps pen contact to element-drag canvas events (Down/Move/Up, tap, double-tap,
hover, cancel). Filters out mouse/touch/trackpad events so it can be combined
with MouseInputSource or TouchInputSource without duplicates. Exposes an
eraserModeStream that emits true / false on eraser-vs-tip mode changes.
-
CanvasDownEvent.pressure / CanvasMoveEvent.pressure (double,
default 1.0) — hardware pen pressure (0.0–1.0) carried by stylus down and
move events. Backwards-compatible: non-stylus sources emit 1.0; existing
construction and pattern-matching compiles unchanged.
-
defaultPointerSource() — factory function that returns the best-fit
CanvasInputSource for the current platform: TouchInputSource on Android /
iOS, MouseInputSource everywhere else (including web). Uses kIsWeb and
defaultTargetPlatform from package:flutter/foundation.dart, so it is safe
to call on web without conditional imports. GestureInputSource is not
included — it requires platform-specific configuration that cannot be inferred
automatically.
-
TouchInputSource — mobile-native input source for Android and iOS.
Single-finger drag → CanvasScrollEvent (direct-manipulation pan); two-finger
pinch/spread → CanvasScaleEvent; fling → CanvasScrollEvent with non-zero
velocity field for consumer momentum animations. Tap detection uses raw
Listener events rather than GestureDetector so taps are never dropped by
ScaleGestureRecognizer's kPanSlop movement threshold.
-
CanvasScrollEvent.velocity (Offset, default Offset.zero) — fling
velocity field added to CanvasScrollEvent. Non-zero only on fling events
emitted by TouchInputSource. Backwards-compatible: existing code that
constructs or pattern-matches CanvasScrollEvent compiles unchanged.
