samples/web/charts/lib/combo_chart/numeric_line_point.dart

// 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 lines, and a
/// third rendered as points along the top line with a different color.
///
/// This example demonstrates a method for drawing points along a line using a
/// different color from the main series color. The line renderer supports
/// drawing points with the "includePoints" option, but those points will share
/// the same color as the 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 NumericComboLinePointChart extends StatelessWidget {
  final List<charts.Series<dynamic, num>> seriesList;
  final bool? animate;

  const NumericComboLinePointChart(this.seriesList, {this.animate, Key? key})
      : super(key: key);

  /// Creates a [LineChart] with sample data and no transition.
  factory NumericComboLinePointChart.withSampleData() {
    return NumericComboLinePointChart(
      _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 NumericComboLinePointChart.withRandomData() {
    return NumericComboLinePointChart(_createRandomData());
  }

  /// Create random data.
  static List<charts.Series<LinearSales, num>> _createRandomData() {
    final random = Random();

    final desktopSalesData = [
      LinearSales(0, random.nextInt(100)),
      LinearSales(1, random.nextInt(100)),
      LinearSales(2, random.nextInt(100)),
      LinearSales(3, random.nextInt(100)),
    ];

    final tableSalesData = [
      LinearSales(0, random.nextInt(100)),
      LinearSales(1, random.nextInt(100)),
      LinearSales(2, random.nextInt(100)),
      LinearSales(3, random.nextInt(100)),
    ];

    final mobileSalesData = [
      LinearSales(0, tableSalesData[0].sales),
      LinearSales(1, tableSalesData[1].sales),
      LinearSales(2, tableSalesData[2].sales),
      LinearSales(3, tableSalesData[3].sales),
    ];

    return [
      charts.Series<LinearSales, int>(
        id: 'Desktop',
        colorFn: (_, __) => charts.MaterialPalette.blue.shadeDefault,
        domainFn: (LinearSales sales, _) => sales.year,
        measureFn: (LinearSales sales, _) => sales.sales,
        data: desktopSalesData,
      ),
      charts.Series<LinearSales, int>(
        id: 'Tablet',
        colorFn: (_, __) => charts.MaterialPalette.red.shadeDefault,
        domainFn: (LinearSales sales, _) => sales.year,
        measureFn: (LinearSales sales, _) => sales.sales,
        data: tableSalesData,
      ),
      charts.Series<LinearSales, int>(
          id: 'Mobile',
          colorFn: (_, __) => charts.MaterialPalette.green.shadeDefault,
          domainFn: (LinearSales sales, _) => sales.year,
          measureFn: (LinearSales sales, _) => sales.sales,
          data: mobileSalesData)
        // Configure our custom point renderer for this series.
        ..setAttribute(charts.rendererIdKey, 'customPoint'),
    ];
  }
  // EXCLUDE_FROM_GALLERY_DOCS_END

  @override
  Widget build(BuildContext context) {
    return 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: charts.LineRendererConfig(),
        // Custom renderer configuration for the point series.
        customSeriesRenderers: [
          charts.PointRendererConfig(
              // ID used to link series to this renderer.
              customRendererId: 'customPoint')
        ]);
  }

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

    final tableSalesData = [
      LinearSales(0, 10),
      LinearSales(1, 50),
      LinearSales(2, 200),
      LinearSales(3, 150),
    ];

    final mobileSalesData = [
      LinearSales(0, 10),
      LinearSales(1, 50),
      LinearSales(2, 200),
      LinearSales(3, 150),
    ];

    return [
      charts.Series<LinearSales, int>(
        id: 'Desktop',
        colorFn: (_, __) => charts.MaterialPalette.blue.shadeDefault,
        domainFn: (LinearSales sales, _) => sales.year,
        measureFn: (LinearSales sales, _) => sales.sales,
        data: desktopSalesData,
      ),
      charts.Series<LinearSales, int>(
        id: 'Tablet',
        colorFn: (_, __) => charts.MaterialPalette.red.shadeDefault,
        domainFn: (LinearSales sales, _) => sales.year,
        measureFn: (LinearSales sales, _) => sales.sales,
        data: tableSalesData,
      ),
      charts.Series<LinearSales, int>(
          id: 'Mobile',
          colorFn: (_, __) => charts.MaterialPalette.green.shadeDefault,
          domainFn: (LinearSales sales, _) => sales.year,
          measureFn: (LinearSales sales, _) => sales.sales,
          data: mobileSalesData)
        // Configure our custom point renderer for this series.
        ..setAttribute(charts.rendererIdKey, 'customPoint'),
    ];
  }
}

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

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