'Path.relativeLineTo' seems to not work when using '--wasm' flag. #157161
Description
Steps to reproduce
- Create a CustomPainter and a Path() object within the paint method.
- use 'relativeLineTo' to draw a shape.
- Run with wasm using: 'flutter run --wasm -d chrome'.
Expected results
I expected to see the shape.
Actual results
The shape does not appear when using the '--wasm' flag, but the shape does appear when running with JS.
Code sample
Code sample
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
home: const MyHomePage(),
);
}
}
class MyHomePage extends StatelessWidget {
const MyHomePage({super.key});
@override
Widget build(BuildContext context) {
return CustomPaint(
painter: MyPainter(),
size: Size.infinite,
);
}
}
class MyPainter extends CustomPainter {
@override
void paint(Canvas canvas, Size size) {
final path = Path();
final center = size * 0.5;
path.moveTo(center.width, center.height);
path.lineTo(center.width + 50, center.height + 50);
path.lineTo(center.width - 50, center.height + 50);
path.lineTo(center.width, center.height);
canvas.drawPath(path, Paint()..color = Colors.red);
final relativePath = Path();
relativePath.moveTo(center.width, center.height);
relativePath.relativeLineTo(-50, -50);
relativePath.relativeLineTo(100, 0);
relativePath.relativeLineTo(-50, 50);
canvas.drawPath(relativePath, Paint()..color = Colors.green);
}
@override
bool shouldRepaint(MyPainter oldDelegate) => true;
@override
bool shouldRebuildSemantics(MyPainter oldDelegate) => true;
}
Screenshots or Video
Screenshots / Video demonstration
flutter run -d chrome
flutter run --wasm -d chrome
Logs
Logs
no errorsFlutter Doctor output
Doctor output
[√] Flutter (Channel master, 3.27.0-1.0.pre.98, on Microsoft Windows [Version 10.0.22631.4317], locale en-GB)
• Flutter version 3.27.0-1.0.pre.98 on channel master at C:\Users\thoma\Documents\flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 77f88ff78a (18 hours ago), 2024-10-17 22:43:20 +0300
• Engine revision 31aaaaad86
• Dart version 3.7.0 (build 3.7.0-34.0.dev)
• DevTools version 2.40.1
[√] Windows Version (Installed version of Windows is version 10 or higher)
[√] Android toolchain - develop for Android devices (Android SDK version 33.0.1)
• Android SDK at C:\Users\thoma\AppData\Local\Android\sdk
• Platform android-35, build-tools 33.0.1
• Java binary at: C:\Program Files\Android\Android Studio\jbr\bin\java
• Java version OpenJDK Runtime Environment (build 17.0.11+0--11852314)
• All Android licenses accepted.
[√] Chrome - develop for the web
• Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe
[√] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.0.5)
• Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
• Visual Studio Community 2022 version 17.0.32112.339
• Windows 10 SDK version 10.0.19041.0
[√] Android Studio (version 2024.1)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin can be installed from:
https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 17.0.11+0--11852314)
[√] VS Code (version 1.94.2)
• VS Code at C:\Users\thoma\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 3.46.0
• Platform android-35, build-tools 33.0.1
• Java binary at: C:\Program Files\Android\Android Studio\jbr\bin\java
• Java version OpenJDK Runtime Environment (build 17.0.11+0--11852314)
• All Android licenses accepted.
[√] Chrome - develop for the web
• Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe
[√] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.0.5)
• Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
• Visual Studio Community 2022 version 17.0.32112.339
• Windows 10 SDK version 10.0.19041.0
[√] Android Studio (version 2024.1)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin can be installed from:
https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 17.0.11+0--11852314)
[√] VS Code (version 1.94.2)
• VS Code at C:\Users\thoma\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 3.46.0
[√] Android Studio (version 2024.1)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin can be installed from:
https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 17.0.11+0--11852314)
[√] VS Code (version 1.94.2)
• VS Code at C:\Users\thoma\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 3.46.0
[√] Connected device (3 available)
• Windows (desktop) • windows • windows-x64 • Microsoft Windows [Version 10.0.22631.4317]
• Chrome (web) • chrome • web-javascript • Google Chrome 127.0.6533.100
• Edge (web) • edge • web-javascript • Microsoft Edge 129.0.2792.65
[√] Network resources
• Windows (desktop) • windows • windows-x64 • Microsoft Windows [Version 10.0.22631.4317]
• Chrome (web) • chrome • web-javascript • Google Chrome 127.0.6533.100
• Edge (web) • edge • web-javascript • Microsoft Edge 129.0.2792.65
[√] Network resources
[√] Network resources
• All expected network resources are available.
• No issues found!