69 lines
2.2 KiB
Dart
69 lines
2.2 KiB
Dart
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// lib/editor/engine/stroke_geometry.dart
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//
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// Single source of stroke outline geometry for both screen render and export.
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// The recipe is lifted verbatim from the proven live
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// `ink_painters.buildStrokePath` (lib/editor/canvas/ink_painters.dart): points
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// are scaled from normalized page coords to pixels, perfect_freehand produces
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// the outline, and a closed fill Path is built. Keeping ONE implementation here
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// kills the hairline-export divergence (R7).
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import 'dart:ui';
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import 'package:perfect_freehand/perfect_freehand.dart' as pf;
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import 'stroke_model.dart';
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/// Builds a closed, fillable outline [Path] for one [stroke], scaled into the
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/// pixel space of [pageSize] (which maps normalized [0,1] coords to pixels).
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///
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/// [isComplete] should be false for the in-progress live stroke so freehand
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/// tapers the trailing end correctly, and true for committed strokes.
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///
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/// Returns an empty [Path] when the stroke has no points (or freehand produces
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/// no outline).
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Path buildStrokeOutline(
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EditorStroke stroke,
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Size pageSize, {
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required bool isComplete,
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}) {
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final path = Path();
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if (stroke.points.isEmpty) return path;
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final pixelWidth = stroke.width * pageSize.width;
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final hasRealPressure = stroke.points.any((p) => p.pressure != null);
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final isHighlighter = stroke.tool == EditorTool.highlighter;
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final pfPoints = stroke.points
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.map(
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(p) => pf.Point(
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p.x * pageSize.width,
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p.y * pageSize.height,
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p.pressure ?? 0.5,
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),
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)
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.toList();
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final outline = pf.getStroke(
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pfPoints,
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size: pixelWidth,
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// Highlighter keeps a constant width (no thinning); pen thins (0.7),
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// matching the live recipe.
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thinning: isHighlighter ? 0.0 : 0.7,
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smoothing: 0.5,
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streamline: 0.5,
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// Real stylus pressure -> don't simulate; no pressure -> let freehand fake
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// it based on velocity (highlighter never simulates).
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simulatePressure: !hasRealPressure && !isHighlighter,
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isComplete: isComplete,
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);
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if (outline.isEmpty) return path;
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path.moveTo(outline.first.x, outline.first.y);
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for (var i = 1; i < outline.length; i++) {
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path.lineTo(outline[i].x, outline[i].y);
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}
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path.close();
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return path;
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}
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