48 lines
1.3 KiB
Dart
48 lines
1.3 KiB
Dart
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// lib/editor/canvas/pen_stroke.dart
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//
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// Pen-first canvas stroke model. Points are stored in NORMALIZED page
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// coordinates ([0,1] x [0,1] relative to the page rectangle) so strokes stay
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// pinned to the page regardless of zoom/pan or the on-screen page size.
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import 'package:flutter/foundation.dart';
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/// A single captured sample of a stroke.
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///
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/// [x]/[y] are normalized to the page rectangle ([0,1]).
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/// [pressure] is the normalized stylus pressure ([0,1]) or null when the
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/// device reported no usable pressure (perfect_freehand then simulates it).
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@immutable
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class PenPoint {
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const PenPoint(this.x, this.y, this.pressure);
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final double x;
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final double y;
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final double? pressure;
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}
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/// Which kind of mark a stroke is.
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enum PenStrokeKind { pen, highlighter }
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/// A committed stroke for a single page, in normalized page coordinates.
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@immutable
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class PenStroke {
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const PenStroke({
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required this.points,
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required this.color,
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required this.width,
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required this.kind,
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});
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/// Normalized points (see [PenPoint]).
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final List<PenPoint> points;
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/// ARGB color value.
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final int color;
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/// Stroke width expressed as a fraction of the page width, so it scales with
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/// the page when zoomed. Multiply by the on-screen page width to get pixels.
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final double width;
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final PenStrokeKind kind;
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}
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