Akiba So
3cfb793803
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A stylus point drawn at 2x zoom maps to the correct normalized page coordinate (canvas-local 200,300 → scene 100,150 → normalized 0.25,0.25), guarding that ink stays glued to the page under zoom/pan — the core own-canvas invariant. flutter analyze lib/editor clean; 238/238 tests (+1). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
59 lines
2.0 KiB
Dart
59 lines
2.0 KiB
Dart
// Device-independent correctness guard: a drawn point must map to the right
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// NORMALIZED page coordinate through a non-identity (zoomed) transform, so ink
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// stays glued to the page under zoom/pan.
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import 'package:flutter/gestures.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter_test/flutter_test.dart';
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import 'package:badnote/editor/canvas/pen_canvas.dart';
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import 'package:badnote/editor/canvas/pen_stroke.dart';
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void main() {
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const pageSize = Size(400, 600);
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testWidgets('a stylus point maps to correct normalized coords at 2x zoom',
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(tester) async {
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final committed = <PenStroke>[];
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final controller = TransformationController()
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..value = (Matrix4.identity()..scaleByDouble(2.0, 2.0, 2.0, 1));
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addTearDown(controller.dispose);
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await tester.pumpWidget(MaterialApp(
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home: Scaffold(
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body: Center(
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child: SizedBox(
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width: pageSize.width,
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height: pageSize.height,
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child: PenCanvas(
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pageWidget: Container(color: const Color(0xFFEEEEEE)),
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pageSize: pageSize,
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strokes: const <PenStroke>[],
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transformationController: controller,
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tool: CanvasTool.pen,
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color: const Color(0xFF000000),
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strokeWidth: 0.004,
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onStrokeComplete: committed.add,
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onEraseStroke: (_, __) {},
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),
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),
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),
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),
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));
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// Down at the canvas-local point (200, 300). At 2x scale, scene = (100,150),
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// normalized = (100/400, 150/600) = (0.25, 0.25).
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final topLeft = tester.getTopLeft(find.byType(PenCanvas));
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final g = await tester.startGesture(topLeft + const Offset(200, 300),
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kind: PointerDeviceKind.stylus);
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await g.moveBy(const Offset(8, 8)); // make it a stroke, not a tap
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await g.up();
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await tester.pump();
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expect(committed, hasLength(1));
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final first = committed.single.points.first;
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expect(first.x, closeTo(0.25, 1e-3));
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expect(first.y, closeTo(0.25, 1e-3));
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});
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}
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