Inability to use ui.Canvas.drawPoints(...) in Flutter for the web. #49580
Description
I believe I am post flutter/engine#15870 but I have included the output from flutter doctor below to confirm one way or the other.
I am attempting to use ui.Canvas.drawPoints(...) in Flutter for the web, but tripping over Unimplemented errors.
════════ Exception caught by rendering library ═════════════════════════════════
The following UnimplementedError was thrown during paint():
UnimplementedError
When the exception was thrown, this was the stack
throw_ (package:dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart:196:49)
drawPoints (package:build_web_compilers/lib/ui/src/ui/canvas.dart:953:5)
draw
package:vector_paint/main.dart:75
<fn>
package:vector_paint/main.dart:130
forEach] (package:dart-sdk/lib/_internal/js_dev_runtime/private/js_array.dart:205:8)
...
The following RenderObject was being processed when the exception was fired: RenderCustomPaint#42a4c relayoutBoundary=up7
RenderObject: RenderCustomPaint#42a4c relayoutBoundary=up7
parentData: <none> (can use size)
constraints: BoxConstraints(0.0<=w<=840.0, 0.0<=h<=892.0)
size: Size(840.0, 892.0)
════════════════════════════════════════════════════════════════════════════════
My code looks like the following:
final paint = Paint()
..color = _color
..strokeWidth = _radius
..style = PaintingStyle.stroke
..strokeCap = StrokeCap.round;
canvas.drawPoints(
_points.length > 1 ? ui.PointMode.polygon : ui.PointMode.points,
_points,
paint);
Where _points is a List<ui.Offset>.
Flutter doctor output:
flutter doctor -v
[✓] Flutter (Channel master, v1.14.3-pre.2, on Mac OS X 10.15.2 19C57, locale en)
• Flutter version 1.14.3-pre.2 at /Users/brettmorgan/flutter
• Framework revision ac7b307803 (7 days ago), 2020-01-20 23:23:02 -0800
• Engine revision aa50eae0f7
• Dart version 2.8.0 (build 2.8.0-dev.3.0 f96c48307d)
[✗] Android toolchain - develop for Android devices
✗ Unable to locate Android SDK.
Install Android Studio from: https://developer.android.com/studio/index.html
On first launch it will assist you in installing the Android SDK components.
(or visit https://flutter.dev/setup/#android-setup for detailed instructions).
If the Android SDK has been installed to a custom location, set ANDROID_HOME to that location.
You may also want to add it to your PATH environment variable.
[✓] Xcode - develop for iOS and macOS (Xcode 11.3.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 11.3.1, Build version 11C505
• CocoaPods version 1.8.4
[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[!] Android Studio (not installed)
• Android Studio not found; download from https://developer.android.com/studio/index.html
(or visit https://flutter.dev/setup/#android-setup for detailed instructions).
[✓] IntelliJ IDEA Community Edition (version 2019.2.3)
• IntelliJ at /Applications/IntelliJ IDEA CE.app
• Flutter plugin version 42.2.2
• Dart plugin version 192.7761
[✓] VS Code (version 1.41.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.7.1
[✓] Connected device (3 available)
• macOS • macOS • darwin-x64 • Mac OS X 10.15.2 19C57
• Chrome • chrome • web-javascript • Google Chrome 79.0.3945.130
• Web Server • web-server • web-javascript • Flutter Tools
! Doctor found issues in 2 categories.