【flutter】数行でできる！Pyramid Chartを実装してみた！【syncfusion_flutter_chart】

dependencies:
  flutter:
    sdk: flutter
  <!--下記1行を追加-->
  syncfusion_flutter_charts: 18.3.53

import 'package:flutter/material.dart';
<!-- 下記1行でsyncfusion_flutter_chartsをインポート -->
import 'package:syncfusion_flutter_charts/charts.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    <!-- 下記chartDataにチャートで表示するためのデータを格納 -->
    final List<ChartData> chartData = [
      ChartData('ねこ', 5),
      ChartData('お父さん', 8),
      ChartData('お母さん', 4),
      ChartData('ぼく', 2)
    ];
    return Scaffold(
        body: Center(
            child: Container(
                <!-- SfPyramidChartでピラミッド型チャートを指定 -->
                child: SfPyramidChart(
                    <!-- チャートタイトルを表示 -->
                    title: ChartTitle(text: '家庭内権力図'),
                    <!-- グラフの色を指定 -->
                    palette: <Color>[
                      Colors.orange[300],
                      Colors.orange[200],
                      Colors.orange[100],
                      Colors.orange[50]
                    ],
                    <!-- グラフをタップした際にツールチップを表示 -->
                    tooltipBehavior: TooltipBehavior(enable: true),
                    <!-- グラフ下にデータ情報を表示 -->
                    legend: Legend(isVisible: true),
                    <!-- 表示データの設定 -->
                    series: PyramidSeries<ChartData, String>(
                        dataSource: chartData,
                        xValueMapper: (ChartData data, _) => data.x,
                        yValueMapper: (ChartData data, _) => data.y,
                        dataLabelSettings:
                            DataLabelSettings(isVisible: true))))));
  }
}

<!-- データ用クラスを定義 -->
class ChartData {
  ChartData(this.x, this.y, [this.color]);
  final String x;
  final double y;
  final Color color;
}