rtc/widgets/annotation_painter library

Classes

canvasToNormalised(Offset position, VideoContentBounds bounds) → List<double>?: Converts a canvas pixel offset to a normalised coordinate (0–1). Returns null if the point is outside the video content area.
getRenderedVideoContentBounds({required double containerWidth, required double containerHeight, required double videoWidth, required double videoHeight}) → VideoContentBounds: Calculates the actual rendered video area inside a container, accounting for letterboxing (object-fit: contain equivalent).
getStrokeContentScale(double contentHeight) → double: Scales stroke width proportionally relative to a 720px reference height.
normalisedToCanvas(double nx, double ny, VideoContentBounds bounds) → Offset: Converts a normalised coordinate (0–1) to a canvas pixel offset.