[syncfusion_flutter_charts] SplineAreaSeries with extreme value difference does not align line and area #2429
Description
Bug description
With a SplineAreaSeries that has an extreme y value outside of the defined range of the y axis, the line and area can differ and have some space between them.
Steps to reproduce
- Load the sample
- See a gap between line and area at July 2022
Code sample
Code sample
import 'package:flutter/material.dart'; import 'package:syncfusion_flutter_charts/charts.dart'; import 'package:syncfusion_flutter_charts/sparkcharts.dart'; void main() { return runApp(_ChartApp()); } class _ChartApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( theme: ThemeData(primarySwatch: Colors.blue, useMaterial3: false), home: _MyHomePage(), ); } } class _MyHomePage extends StatefulWidget { // ignore: prefer_const_constructors_in_immutables _MyHomePage({Key? key}) : super(key: key); @override _MyHomePageState createState() => _MyHomePageState(); } class _MyHomePageState extends State<_MyHomePage> { List<_SalesData> data = [ _SalesData(DateTime(2021, 7), 478855.8), _SalesData(DateTime(2022, 7), 720.4), _SalesData(DateTime(2023, 7), 573.3), ]; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: const Text('Syncfusion Flutter chart')), body: SfCartesianChart( primaryXAxis: DateTimeAxis( minimum: DateTime(2021), maximum: DateTime(2024), ), primaryYAxis: NumericAxis(minimum: 0, maximum: 3680, interval: 200), // Enable tooltip tooltipBehavior: TooltipBehavior(enable: true), series: <CartesianSeries<_SalesData, DateTime>>[ SplineAreaSeries<_SalesData, DateTime>( color: Colors.amber.withValues(alpha: 0.5), borderColor: Colors.red, splineType: SplineType.monotonic, dataSource: data, xValueMapper: (_SalesData sales, _) => sales.year, yValueMapper: (_SalesData sales, _) => sales.sales, ), ], ), ); } } class _SalesData { _SalesData(this.year, this.sales); final DateTime year; final double sales; } Screenshots or Video
Screenshots / Video demonstration
Stack Traces
Stack Traces
No error thrown
On which target platforms have you observed this bug?
Web, Windows
Flutter Doctor output
Doctor output
[√] Flutter (Channel stable, 3.32.0, on Microsoft Windows [Version 10.0.19045.6216], locale de-DE) [527ms] • Flutter version 3.32.0 on channel stable at C:\Users\Niels\Documents\flutter • Upstream repository https://github.com/flutter/flutter.git • Framework revision be698c48a6 (4 months ago), 2025-05-19 12:59:14 -0700 • Engine revision 1881800949 • Dart version 3.8.0 • DevTools version 2.45.1 [√] Windows Version (10 Education 64-bit, 22H2, 2009) [3,0s] [!] Android toolchain - develop for Android devices (Android SDK version 35.0.0) [3,2s] • Android SDK at C:\Users\Niels\AppData\Local\Android\Sdk • Platform android-35, build-tools 35.0.0 • Java binary at: C:\Program Files\Android\Android Studio1\jbr\bin\java This is the JDK bundled with the latest Android Studio installation on this machine. To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`. • Java version OpenJDK Runtime Environment (build 17.0.11+0--11852314) ! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses [√] Chrome - develop for the web [114ms] • Chrome at C:\Users\Niels\AppData\Local\Google\Chrome\Application\chrome.exe [√] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.14.6 (June 2025)) [112ms] • Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community • Visual Studio Community 2022 version 17.14.36212.18 • Windows 10 SDK version 10.0.26100.0 [!] Android Studio (version 2021.2) [25ms] • 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 X Unable to determine bundled Java version. • Try updating or re-installing Android Studio. [√] Android Studio (version 2024.1) [23ms] • Android Studio at C:\Program Files\Android\Android Studio1 • 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, 64-bit edition (version 1.96.0) [22ms] • VS Code at C:\Program Files\Microsoft VS Code • Flutter extension version 3.118.0 [√] Connected device (3 available) [360ms] • Windows (desktop) • windows • windows-x64 • Microsoft Windows [Version 10.0.19045.6216] • Chrome (web) • chrome • web-javascript • Google Chrome 139.0.7258.155 • Edge (web) • edge • web-javascript • Microsoft Edge 128.0.2739.42 [√] Network resources [730ms] • All expected network resources are available. ! Doctor found issues in 2 categories.