Question

我想在我的应用程序中制作一个3D饼图，但是我发现很难找到在图中显示所选区域的面积和名称的解决方案。

我正在使用AnimatedCircularChart，因此该包是：导入'package：flutter_circular_chart / flutter_circular_chart.dart';

 > AnimatedCircularChart(
            key: _chartKey,
      size: _chartSize,
      initialChartData: _quarterlyProfitPieData[0],
      chartType: CircularChartType.Pie,

我希望标签位于所选区域上方。

Answer 1

Flutter Circular Chart是很酷的动画图表库，但是很难进行自定义修改，例如在其顶部添加标签。我发现Chart Flutter库对于您的情况是一个很好的选择。它可以创建带有自定义标签的饼图。最好的部分是您也可以为其设置动画。此开源库由Google Team维护。

以下是Chart Flutter的一些示例代码实现：

import 'package:charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';

class PieOutsideLabelChart extends StatelessWidget {
  final List<charts.Series> seriesList;
  final bool animate;

  PieOutsideLabelChart(this.seriesList, {this.animate});

  /// Creates a [PieChart] with sample data and no transition.
  factory PieOutsideLabelChart.withSampleData() {
    return new PieOutsideLabelChart(
      _createSampleData(),
      // Disable animations for image tests.
      animate: false,
    );
  }


  @override
  Widget build(BuildContext context) {
    return new charts.PieChart(seriesList,
        animate: animate,
        // Add an [ArcLabelDecorator] configured to render labels outside of the
        // arc with a leader line.
        //
        // Text style for inside / outside can be controlled independently by
        // setting [insideLabelStyleSpec] and [outsideLabelStyleSpec].
        //
        // Example configuring different styles for inside/outside:
        //       new charts.ArcLabelDecorator(
        //          insideLabelStyleSpec: new charts.TextStyleSpec(...),
        //          outsideLabelStyleSpec: new charts.TextStyleSpec(...)),
        defaultRenderer: new charts.ArcRendererConfig(arcRendererDecorators: [
          new charts.ArcLabelDecorator(
              labelPosition: charts.ArcLabelPosition.outside)
        ]));
  }

  /// Create one series with sample hard coded data.
  static List<charts.Series<LinearSales, int>> _createSampleData() {
    final data = [
      new LinearSales(0, 100),
      new LinearSales(1, 75),
      new LinearSales(2, 25),
      new LinearSales(3, 5),
    ];

    return [
      new charts.Series<LinearSales, int>(
        id: 'Sales',
        domainFn: (LinearSales sales, _) => sales.year,
        measureFn: (LinearSales sales, _) => sales.sales,
        data: data,
        // Set a label accessor to control the text of the arc label.
        labelAccessorFn: (LinearSales row, _) => '${row.year}: ${row.sales}',
      )
    ];
  }
}

/// Sample linear data type.
class LinearSales {
  final int year;
  final int sales;

  LinearSales(this.year, this.sales);
}

结果：

有什么方法可以在flutter中创建3D图表

1 个答案: