Flutter Charts: Hands On Tutorial For 6 Different Types Of Charts With Code Samples

Pictures speak louder and quicker than words. One of the examples proving this is a graphical representation of data. From management’s perspective, charts play an important role in making quick decisions.

Charts In Flutter:

For the Flutter apps, FL Chart provides a very easy and attractive way to create Flutter charts. The FL Chart library is not only easy to use but also highly customizable. We can create interactive charts that respond to user interactions, such as touch events. Here, we are going to see how to build the charts with fl_chart.

The data used for the examples is simple and easy to understand the implementation.

Prerequisites:

Before the ignition, let’s confirm the supplies. You need the following.

• Flutter SDK
• Android Studio, VS Code, or any other relevant code editor
• Basic Flutter knowledge.

To develop apps efficiently using Flutter, especially when implementing data visualizations like charts, Flutter App Development Services is highly recommended. This will help you understand how Flutter can be used to create responsive and high-performing applications, making it easier to integrate features like charts into your projects.

The most used chart types in Flutter are Line charts, Bar charts, and Pie charts. Here, we have also covered the Scatter chart, Radar chart, and Candle chart. The code is arranged as follows: from the landing home screen, we have options to navigate to a particular chart. In the code, there is a controller that embeds a widget of that particular chart, which is the main code you would be interested in. Let’s go one by one.

Line Charts In FlutterOverview:

To represent the data graphically, Line charts are considered to be one of the most useful ways in Flutter for data visualization. Here, we are going to see the data of demand per month between two products in a Flutter line chart.

Check the following code block.

child: LineChart( LineChartData( borderData: FlBorderData( border: Border( bottom: BorderSide(), left: BorderSide(), ), ), gridData: FlGridData( show: true, drawHorizontalLine: true, drawVerticalLine: false, ), titlesData: FlTitlesData( topTitles: AxisTitles( sideTitles: SideTitles(showTitles: false), ), rightTitles: AxisTitles( sideTitles: SideTitles(showTitles: false), ), bottomTitles: AxisTitles( sideTitles: bottomTitles, ), ), lineBarsData: [ LineChartBarData( spots: changeState? getTheSpots(1) : getTheSpots(0), isCurved: true, barWidth: 3, color: Colors.blue), LineChartBarData( spots: changeState? getTheSpots(2) : getTheSpots(0), isCurved: true, barWidth: 3, color: Colors.green), ], lineTouchData: LineTouchData( enabled: true, touchTooltipData: LineTouchTooltipData( getTooltipItems: (touchedSpot) { return touchedSpot.map( (spot) => LineTooltipItem( spot.y.toString(), TextStyle(color: Colors.white), ), ).toList(); }, getTooltipColor: (touchedSpot) => Colors.grey, ), ), ), )Code language: JavaScript (javascript)

LineChart is the widget provided by fl_chart to create the line chart. It takes LineChartData as a key parameter that defines how the data is going to be represented.

Now, let’s see the properties inside it.

• borderData: It defines how the borders of the chart should look or even not to show at all. If you want to hide it, just pass false as

borderData: FlBorderData(show: false)Code language: JavaScript (javascript)

By default, it is "true," and we can further specify how the borders should be shown with the BorderSide widget.

• gridData: By passing the FlGridData to this property we can decide the look of the grid on the chart. We can hide the grid by passing false to the "show" property of this widget. You can play with other properties of FlGridData like drawHorizontalLine, drawVerticalLine, horizontalInterval, verticalInterval, etc.
• titlesData: This property takes a FlTitlesData widget, which takes an AxisTitles widget that defines how the titles on the axis need to be shown. We can customize these with SideTitles widget.

Now for the part that plots the line, refer to the below code block.

lineBarsData: [ LineChartBarData( spots: getTheSpots(1), isCurved: false, barWidth: 3, color: Colors.blue), LineChartBarData( spots: getTheSpots(2), isCurved: false, barWidth: 3, color: Colors.green), ],

Dive Into Flutter Charts:https://mobisoftinfotech.com/resources/blog/app-development/flutter-charts-tutorial-6-types-with-code-samples

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