feat: migrate dragon_charts_flutter to monorepo packages#164
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git-subtree-dir: packages/dragon_charts git-subtree-split: 3b667aab45cb1353e902c6b314c0e4ff19fb9022
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Pull Request Overview
This PR migrates the dragon_charts_flutter repository to the monorepo packages structure while preserving complete git history. The package provides a lightweight and highly customizable charting library for Flutter with features including animated line charts, sparkline charts, interactive tooltips, and multiple chart visualization options.
Key Changes:
- Migrated complete dragon_charts_flutter codebase from standalone repository to packages/dragon_charts/
- Preserved original package structure and functionality including LineChart, SparklineChart, and supporting components
- Maintained comprehensive test suite and example application across multiple platforms
Reviewed Changes
Copilot reviewed 110 out of 151 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| packages/dragon_charts/pubspec.yaml | Package configuration with dependencies and metadata |
| packages/dragon_charts/lib/ | Core library implementation including chart components, data structures, and selection strategies |
| packages/dragon_charts/test/ | Comprehensive test suite covering all major chart components |
| packages/dragon_charts/example/ | Multi-platform example application demonstrating chart functionality |
Files not reviewed (3)
- packages/dragon_charts/example/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata: Language not supported
- packages/dragon_charts/example/ios/Runner.xcworkspace/contents.xcworkspacedata: Language not supported
- packages/dragon_charts/example/macos/Runner.xcworkspace/contents.xcworkspacedata: Language not supported
Comments suppressed due to low confidence (3)
packages/dragon_charts/test/dragon_charts_flutter.dart:3
- This test file contains only an empty placeholder test. The test should either be implemented with actual functionality testing or removed if not needed.
void main() {
packages/dragon_charts/test/dragon_charts_flutter.dart:4
- The test description 'adds one to input values' does not match the dragon_charts_flutter package functionality. This appears to be placeholder test code that should be updated or removed.
test('adds one to input values', () {
packages/dragon_charts/lib/src/line_chart.dart:46
- Potential division by zero error if the data list is empty. The code should check if data.isEmpty before performing the reduce operation and division.
/// LineChart(
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| // Timer to periodically update chart data | ||
| Timer.periodic(const Duration(seconds: 5), (timer) { | ||
| // add(ChartUpdated()); | ||
| if (Random().nextBool() || true) { |
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Bug: Random Check Overridden by True
The if (Random().nextBool() || true) condition always evaluates to true due to the || true clause. This renders the Random().nextBool() check ineffective, causing the chart data point count to always change instead of randomly. This appears to be debug code accidentally left in.
| final double dx = size.width / (data.length - 1); | ||
| final double minValue = data.reduce((a, b) => a < b ? a : b); | ||
| final double maxValue = data.reduce((a, b) => a > b ? a : b); | ||
| final double scaleY = size.height / (maxValue - minValue); |
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Bug: SparklineChart Fails on Empty Data
The SparklineChart crashes with a StateError when an empty data list is provided. This is because data.reduce() is called on an empty collection in the constructor (for average calculation) and the paint method (for min/max value calculation).
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I enhanced the SparklineChart to robustly handle edge cases like empty, single, or uniform data sets, preventing crashes and improving rendering. I also added comprehensive widget tests to validate these new behaviors.
- I modified the
_CustomSparklinePainterconstructor inpackages/dragon_charts/lib/src/sparkline/sparkline_chart.dartto safely calculateaverageby checking for empty data, setting it to0to prevent division by zero errors. - I updated the
paintmethod within_CustomSparklinePainterto gracefully handle edge cases:- It now returns early if
datais empty. - It draws a horizontal line for single data points or when all data values are identical, ensuring a visual representation instead of an error.
- It now returns early if
- I added a new test file,
packages/dragon_charts/test/sparkline_chart_test.dart, implementingtestWidgetsto verify theSparklineChart's stability and correct behavior across various scenarios, including empty, single-point, and uniform data sets.
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Visit the preview URL for this PR (updated for commit b52b4d5): https://komodo-defi-sdk--pr164-migrate-dragon-chart-5sn0xvfv.web.app (expires Thu, 14 Aug 2025 15:08:28 GMT) 🔥 via Firebase Hosting GitHub Action 🌎 Sign: 7f9f5ac39928f333b6e8fcefb7138575e24ed347 |
Co-authored-by: charl <charl@vanstaden.info>
This PR migrates the dragon_charts_flutter repository to the packages folder of the monorepo.
Changes
Package Details
Migration Method
The package is now ready to be integrated into the monorepo workflow.