text: // Copyright 2018 the Charts project authors. Please see the AUTHORS file
  // for details.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  // http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  /// Example of a numeric combo chart with two series rendered as bars, and a
  /// third rendered as a line.
  // EXCLUDE_FROM_GALLERY_DOCS_START
  import 'dart:math';
  // EXCLUDE_FROM_GALLERY_DOCS_END
  import 'package:charts_flutter/flutter.dart' as charts;
  import 'package:flutter/material.dart';
  
  class NumericComboLineBarChart extends StatelessWidget {
    final List<charts.Series> seriesList;
    final bool animate;
  
    NumericComboLineBarChart(this.seriesList, {this.animate});
  
    /// Creates a [LineChart] with sample data and no transition.
    factory NumericComboLineBarChart.withSampleData() {
      return new NumericComboLineBarChart(
        _createSampleData(),
        // Disable animations for image tests.
        animate: false,
      );
    }
  
    // EXCLUDE_FROM_GALLERY_DOCS_START
    // This section is excluded from being copied to the gallery.
    // It is used for creating random series data to demonstrate animation in
    // the example app only.
    factory NumericComboLineBarChart.withRandomData() {
      return new NumericComboLineBarChart(_createRandomData());
    }
  
    /// Create random data.
    static List<charts.Series<LinearSales, num>> _createRandomData() {
      final random = new Random();
  
      final desktopSalesData = [
        new LinearSales(0, random.nextInt(100)),
        new LinearSales(1, random.nextInt(100)),
        new LinearSales(2, random.nextInt(100)),
        new LinearSales(3, random.nextInt(100)),
      ];
  
      final tableSalesData = [
        new LinearSales(0, desktopSalesData[0].sales),
        new LinearSales(1, desktopSalesData[1].sales),
        new LinearSales(2, desktopSalesData[2].sales),
        new LinearSales(3, desktopSalesData[3].sales),
      ];
  
      final mobileSalesData = [
        new LinearSales(0, tableSalesData[0].sales * 2),
        new LinearSales(1, tableSalesData[1].sales * 2),
        new LinearSales(2, tableSalesData[2].sales * 2),
        new LinearSales(3, tableSalesData[3].sales * 2),
      ];
  
      return [
        new charts.Series<LinearSales, int>(
          id: 'Desktop',
          colorFn: (_, __) => charts.MaterialPalette.blue.shadeDefault,
          domainFn: (LinearSales sales, _) => sales.year,
          measureFn: (LinearSales sales, _) => sales.sales,
          data: desktopSalesData,
        )
          // Configure our custom bar renderer for this series.
          ..setAttribute(charts.rendererIdKey, 'customBar'),
        new charts.Series<LinearSales, int>(
          id: 'Tablet',
          colorFn: (_, __) => charts.MaterialPalette.red.shadeDefault,
          domainFn: (LinearSales sales, _) => sales.year,
          measureFn: (LinearSales sales, _) => sales.sales,
          data: tableSalesData,
        )
          // Configure our custom bar renderer for this series.
          ..setAttribute(charts.rendererIdKey, 'customBar'),
        new charts.Series<LinearSales, int>(
            id: 'Mobile',
            colorFn: (_, __) => charts.MaterialPalette.green.shadeDefault,
            domainFn: (LinearSales sales, _) => sales.year,
            measureFn: (LinearSales sales, _) => sales.sales,
            data: mobileSalesData),
      ];
    }
    // EXCLUDE_FROM_GALLERY_DOCS_END
  
    @override
    Widget build(BuildContext context) {
      return new charts.NumericComboChart(seriesList,
          animate: animate,
          // Configure the default renderer as a line renderer. This will be used
          // for any series that does not define a rendererIdKey.
          defaultRenderer: new charts.LineRendererConfig(),
          // Custom renderer configuration for the bar series.
          customSeriesRenderers: [
            new charts.BarRendererConfig(
                // ID used to link series to this renderer.
                customRendererId: 'customBar')
          ]);
    }
  
    /// Create one series with sample hard coded data.
    static List<charts.Series<LinearSales, int>> _createSampleData() {
      final desktopSalesData = [
        new LinearSales(0, 5),
        new LinearSales(1, 25),
        new LinearSales(2, 100),
        new LinearSales(3, 75),
      ];
  
      final tableSalesData = [
        new LinearSales(0, 5),
        new LinearSales(1, 25),
        new LinearSales(2, 100),
        new LinearSales(3, 75),
      ];
  
      final mobileSalesData = [
        new LinearSales(0, 10),
        new LinearSales(1, 50),
        new LinearSales(2, 200),
        new LinearSales(3, 150),
      ];
  
      return [
        new charts.Series<LinearSales, int>(
          id: 'Desktop',
          colorFn: (_, __) => charts.MaterialPalette.blue.shadeDefault,
          domainFn: (LinearSales sales, _) => sales.year,
          measureFn: (LinearSales sales, _) => sales.sales,
          data: desktopSalesData,
        )
          // Configure our custom bar renderer for this series.
          ..setAttribute(charts.rendererIdKey, 'customBar'),
        new charts.Series<LinearSales, int>(
          id: 'Tablet',
          colorFn: (_, __) => charts.MaterialPalette.red.shadeDefault,
          domainFn: (LinearSales sales, _) => sales.year,
          measureFn: (LinearSales sales, _) => sales.sales,
          data: tableSalesData,
        )
          // Configure our custom bar renderer for this series.
          ..setAttribute(charts.rendererIdKey, 'customBar'),
        new charts.Series<LinearSales, int>(
            id: 'Mobile',
            colorFn: (_, __) => charts.MaterialPalette.green.shadeDefault,
            domainFn: (LinearSales sales, _) => sales.year,
            measureFn: (LinearSales sales, _) => sales.sales,
            data: mobileSalesData),
      ];
    }
  }
  
  /// Sample linear data type.
  class LinearSales {
    final int year;
    final int sales;
  
    LinearSales(this.year, this.sales);
  }
  