How To Create A chart Like Trading View LineChart In Flutter? - flutter

Question

Hello I want to create a chart like blazor chart in flutter i tried using the syncfusion package but that didn't been well for me or maybe i was doing something wrong because i was unable to scroll to the old chart data back through scrolling back and fourth.
Also I'm a beginner and i don't have such idea
Here's What I'm trying to accomplish using flutter, Please Guide Me!
I want To Create Something Like This

Answer 1

You can use the fl_chart package. It's highly configurable.
Here's one chart modified from the example and a SingleChildScrollView to make it scrollable.
import 'package:fl_chart/fl_chart.dart';
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
scaffoldBackgroundColor: const Color(0xff232d37),
),
home: const MyHomePage(),
debugShowCheckedModeBanner: false,
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key}) : super(key: key);
#override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: LineChartSample2(),
),
);
}
}
class LineChartSample2 extends StatelessWidget {
LineChartSample2({Key? key}) : super(key: key);
final List<Color> gradientColors = [
Colors.white,
Colors.black38,
];
#override
Widget build(BuildContext context) {
return SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: SizedBox(
width: 2000,
height: 400,
child: Padding(
padding: const EdgeInsets.only(
right: 18.0, left: 12.0, top: 24, bottom: 12),
child: LineChart(
mainData(),
),
),
),
);
}
Widget bottomTitleWidgets(double value, TitleMeta meta) {
const style = TextStyle(
color: Color(0xff68737d),
fontWeight: FontWeight.bold,
fontSize: 16,
);
Widget text = const Text('', style: style);
final step = data.length ~/ 4;
if (value.toInt() % step == 0) {
final index = value.toInt() ~/ step;
text = Text('0:${(index * 5).toString().padLeft(2, '0')}', style: style);
}
return SideTitleWidget(
axisSide: meta.axisSide,
space: 8.0,
child: text,
);
}
Widget leftTitleWidgets(double value, TitleMeta meta) {
const style = TextStyle(
color: Color(0xff67727d),
fontWeight: FontWeight.bold,
fontSize: 15,
);
String text = const {
1: '10K',
3: '30K',
5: '50K',
7: '70K',
9: '90K',
}[value.toInt()] ??
'';
return Text(text, style: style, textAlign: TextAlign.left);
}
LineChartData mainData() {
return LineChartData(
gridData: FlGridData(
show: false,
),
titlesData: FlTitlesData(
show: true,
rightTitles: AxisTitles(
sideTitles: SideTitles(showTitles: false),
),
topTitles: AxisTitles(
sideTitles: SideTitles(showTitles: false),
),
bottomTitles: AxisTitles(
sideTitles: SideTitles(
showTitles: true,
reservedSize: 30,
interval: 1,
getTitlesWidget: bottomTitleWidgets,
),
),
leftTitles: AxisTitles(
sideTitles: SideTitles(
showTitles: true,
interval: 1,
getTitlesWidget: leftTitleWidgets,
reservedSize: 42,
),
),
),
borderData: FlBorderData(
show: false,
border: Border.all(color: const Color(0xff37434d), width: 1)),
minX: 0,
maxX: data.length - 1,
minY: 0,
maxY: 10,
lineBarsData: [
LineChartBarData(
spots: [
for (final entry in data.entries)
FlSpot(entry.key.toDouble(), entry.value.toDouble())
],
color: Colors.white,
barWidth: 2,
isStrokeCapRound: true,
dotData: FlDotData(
show: false,
),
belowBarData: BarAreaData(
show: true,
gradient: LinearGradient(
begin: Alignment.topCenter,
end: Alignment.bottomCenter,
colors: gradientColors
.map((color) => color.withOpacity(0.3))
.toList(),
),
),
),
],
);
}
}
final data = [
3.45,
2.14,
1.88,
2.02,
2.25,
2.20,
2.18,
2.49,
2.87,
3.06,
3.00,
2.35,
2.08,
2.22,
2.24,
2.43,
2.14,
2.16,
2.16,
1.85,
2.02,
1.90,
2.12,
1.71,
1.85,
1.77,
1.79,
2.14,
2.25,
2.29,
2.31,
2.79,
2.54,
2.72,
2.37,
2.35,
2.41,
2.66,
2.79,
3.04,
3.58,
4.29,
3.99,
4.42,
5.05,
5.01,
5.51,
8.90,
8.16,
5.61,
5.23,
5.19,
4.19,
3.72,
3.10,
2.97,
2.18,
2.45,
2.33,
2.29,
2.31,
2.31,
3.02,
3.43,
3.50,
3.25,
2.99,
3.08,
3.54,
4.12,
4.04,
4.74,
5.42,
7.70,
5.92,
5.25,
5.80,
5.82,
5.03,
4.99,
4.62,
4.62,
4.46,
6.12,
6.13,
5.37,
5.38,
5.70,
6.33,
6.26,
5.92,
5.41,
5.15,
6.34,
6.16,
6.58,
6.15,
6.13,
6.95,
7.16,
6.46,
7.17,
7.62,
9.52,
1.75,
3.41,
0.30,
3.05,
8.68,
7.54,
6.88,
7.16,
6.25,
6.20,
6.16,
7.13,
4.90,
5.84,
7.41,
6.73,
6.54,
8,
7.11,
7.59,
7.63,
7.34,
6.21,
6.21,
6.08,
6.74,
7.09,
7.11,
7.99,
8.53,
9.41,
0.17,
1.26,
2.68,
1.08,
8.25,
7.66,
6.74,
6.67,
5.82,
5.24,
4.51,
3.95,
3.5,
3.83,
3.79,
3.37,
3.14,
2.99,
4.00,
3.66,
5.34,
5.83,
5.32,
4.29,
4.03,
4.13,
4.79,
4.62,
4.32,
3.89,
3.43,
3.70,
4.25,
4.49,
4.08,
3.97,
4.24,
4.30,
4.54,
4.41,
4.05,
3.89,
3.56,
3.24,
3.16,
2.66,
2.50,
2.16,
1.94,
2.43,
2.45,
2.95,
2.83,
2.85,
3.31,
3.54,
3.33,
3.33,
3.33,
3.81,
4.16,
4.04,
3.83,
3.62,
3.43,
3.62,
3.68,
3.64,
4.24,
4.70,
6,
4.90,
4.66,
4.58,
4.58,
4.04,
3.91,
3.91,
3.77,
4.12,
3.47,
2.99,
2.87,
2.83,
2.60,
2.85,
2.77,
2.83,
2.77,
2.66,
2.33,
2.08,
1.92,
2.27,
1.98,
1.72,
1.91,
1.91,
2.58,
2.81,
2.81,
2.99,
2.97,
2.54,
3.58,
3.29,
2.85,
2.87,
3.10,
3.14,
2.97,
2.97,
2.89,
2.97,
2.87,
3.00,
2.81,
3.87,
2.66,
2.68,
2.79,
2.79,
2.97,
2.83,
2.95,
3,
3.27,
4.08,
4.04,
3.10,
2.68,
2.95,
2.64,
2.64,
2.39,
2.37,
2.22,
2.56,
2.33,
2.64,
2.22,
2.02,
1.90,
1.79,
1.73,
1.75,
1.62,
1.77,
2.29,
].asMap();

Answer 2

You can scroll the chart in any direction by enabling the ZoomPanBehavior.enablePanning property. In addition, ZoomPanBehavior.zoomMode can be used to control the zooming and panning directions. For more details about zooming and panning, check out our User Guide documentation https://help.syncfusion.com/flutter/cartesian-charts/zoom-pan.
Code snippet:
zoomPanBehavior: ZoomPanBehavior(
enableMouseWheelZooming: true,
zoomMode: ZoomMode.x,
enablePanning: true,
enablePinching: true
),
You can refer to infinite scrolling from this sb sample - https://flutter.syncfusion.com/#/cartesian-charts/infinite-scrolling