web/chart: fix sample (#909)

web/charts/lib/bar_chart/grouped_target_line.dart

@@ -24,10 +24,11 @@ class GroupedBarTargetLineChart extends StatelessWidget {
   final List<charts.Series> seriesList;
   final bool animate;
 
-  GroupedBarTargetLineChart(this.seriesList, {this.animate});
+  const GroupedBarTargetLineChart(this.seriesList, {this.animate, Key key})
+      : super(key: key);
 
   factory GroupedBarTargetLineChart.withSampleData() {
-    return new GroupedBarTargetLineChart(
+    return GroupedBarTargetLineChart(
       _createSampleData(),
       // Disable animations for image tests.
       animate: false,
@@ -39,75 +40,75 @@ class GroupedBarTargetLineChart extends StatelessWidget {
   // It is used for creating random series data to demonstrate animation in
   // the example app only.
   factory GroupedBarTargetLineChart.withRandomData() {
-    return new GroupedBarTargetLineChart(_createRandomData());
+    return GroupedBarTargetLineChart(_createRandomData());
   }
 
   /// Create random data.
   static List<charts.Series<OrdinalSales, String>> _createRandomData() {
-    final random = new Random();
+    final random = Random();
 
     final desktopSalesData = [
-      new OrdinalSales('2014', random.nextInt(100)),
-      new OrdinalSales('2015', random.nextInt(100)),
-      new OrdinalSales('2016', random.nextInt(100)),
-      new OrdinalSales('2017', random.nextInt(100)),
+      OrdinalSales('2014', random.nextInt(100)),
+      OrdinalSales('2015', random.nextInt(100)),
+      OrdinalSales('2016', random.nextInt(100)),
+      OrdinalSales('2017', random.nextInt(100)),
     ];
 
     final tableSalesData = [
-      new OrdinalSales('2014', random.nextInt(100)),
-      new OrdinalSales('2015', random.nextInt(100)),
-      new OrdinalSales('2016', random.nextInt(100)),
-      new OrdinalSales('2017', random.nextInt(100)),
+      OrdinalSales('2014', random.nextInt(100)),
+      OrdinalSales('2015', random.nextInt(100)),
+      OrdinalSales('2016', random.nextInt(100)),
+      OrdinalSales('2017', random.nextInt(100)),
     ];
 
     final mobileSalesData = [
-      new OrdinalSales('2014', random.nextInt(100)),
-      new OrdinalSales('2015', random.nextInt(100)),
-      new OrdinalSales('2016', random.nextInt(100)),
-      new OrdinalSales('2017', random.nextInt(100)),
+      OrdinalSales('2014', random.nextInt(100)),
+      OrdinalSales('2015', random.nextInt(100)),
+      OrdinalSales('2016', random.nextInt(100)),
+      OrdinalSales('2017', random.nextInt(100)),
     ];
 
     final desktopTargetLineData = [
-      new OrdinalSales('2014', random.nextInt(100)),
-      new OrdinalSales('2015', random.nextInt(100)),
-      new OrdinalSales('2016', random.nextInt(100)),
-      new OrdinalSales('2017', random.nextInt(100)),
+      OrdinalSales('2014', random.nextInt(100)),
+      OrdinalSales('2015', random.nextInt(100)),
+      OrdinalSales('2016', random.nextInt(100)),
+      OrdinalSales('2017', random.nextInt(100)),
     ];
 
     final tableTargetLineData = [
-      new OrdinalSales('2014', random.nextInt(100)),
-      new OrdinalSales('2015', random.nextInt(100)),
-      new OrdinalSales('2016', random.nextInt(100)),
-      new OrdinalSales('2017', random.nextInt(100)),
+      OrdinalSales('2014', random.nextInt(100)),
+      OrdinalSales('2015', random.nextInt(100)),
+      OrdinalSales('2016', random.nextInt(100)),
+      OrdinalSales('2017', random.nextInt(100)),
     ];
 
     final mobileTargetLineData = [
-      new OrdinalSales('2014', random.nextInt(100)),
-      new OrdinalSales('2015', random.nextInt(100)),
-      new OrdinalSales('2016', random.nextInt(100)),
-      new OrdinalSales('2017', random.nextInt(100)),
+      OrdinalSales('2014', random.nextInt(100)),
+      OrdinalSales('2015', random.nextInt(100)),
+      OrdinalSales('2016', random.nextInt(100)),
+      OrdinalSales('2017', random.nextInt(100)),
     ];
 
     return [
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Desktop',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
         data: desktopSalesData,
       ),
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Tablet',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
         data: tableSalesData,
       ),
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Mobile',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
         data: mobileSalesData,
       ),
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Desktop Target Line',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
@@ -115,7 +116,7 @@ class GroupedBarTargetLineChart extends StatelessWidget {
       )
         // Configure our custom bar target renderer for this series.
         ..setAttribute(charts.rendererIdKey, 'customTargetLine'),
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Tablet Target Line',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
@@ -123,7 +124,7 @@ class GroupedBarTargetLineChart extends StatelessWidget {
       )
         // Configure our custom bar target renderer for this series.
         ..setAttribute(charts.rendererIdKey, 'customTargetLine'),
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Mobile Target Line',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
@@ -137,11 +138,11 @@ class GroupedBarTargetLineChart extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return new charts.BarChart(seriesList,
+    return charts.BarChart(seriesList,
         animate: animate,
         barGroupingType: charts.BarGroupingType.grouped,
         customSeriesRenderers: [
-          new charts.BarTargetLineRendererConfig<String>(
+          charts.BarTargetLineRendererConfig<String>(
               // ID used to link series to this renderer.
               customRendererId: 'customTargetLine',
               groupingType: charts.BarGroupingType.grouped)
@@ -151,67 +152,67 @@ class GroupedBarTargetLineChart extends StatelessWidget {
   /// Create series list with multiple series
   static List<charts.Series<OrdinalSales, String>> _createSampleData() {
     final desktopSalesData = [
-      new OrdinalSales('2014', 5),
-      new OrdinalSales('2015', 25),
-      new OrdinalSales('2016', 100),
-      new OrdinalSales('2017', 75),
+      OrdinalSales('2014', 5),
+      OrdinalSales('2015', 25),
+      OrdinalSales('2016', 100),
+      OrdinalSales('2017', 75),
     ];
 
     final tableSalesData = [
-      new OrdinalSales('2014', 25),
-      new OrdinalSales('2015', 50),
-      new OrdinalSales('2016', 10),
-      new OrdinalSales('2017', 20),
+      OrdinalSales('2014', 25),
+      OrdinalSales('2015', 50),
+      OrdinalSales('2016', 10),
+      OrdinalSales('2017', 20),
     ];
 
     final mobileSalesData = [
-      new OrdinalSales('2014', 10),
-      new OrdinalSales('2015', 15),
-      new OrdinalSales('2016', 50),
-      new OrdinalSales('2017', 45),
+      OrdinalSales('2014', 10),
+      OrdinalSales('2015', 15),
+      OrdinalSales('2016', 50),
+      OrdinalSales('2017', 45),
     ];
 
     final desktopTargetLineData = [
-      new OrdinalSales('2014', 4),
-      new OrdinalSales('2015', 20),
-      new OrdinalSales('2016', 80),
-      new OrdinalSales('2017', 65),
+      OrdinalSales('2014', 4),
+      OrdinalSales('2015', 20),
+      OrdinalSales('2016', 80),
+      OrdinalSales('2017', 65),
     ];
 
     final tableTargetLineData = [
-      new OrdinalSales('2014', 30),
-      new OrdinalSales('2015', 55),
-      new OrdinalSales('2016', 15),
-      new OrdinalSales('2017', 25),
+      OrdinalSales('2014', 30),
+      OrdinalSales('2015', 55),
+      OrdinalSales('2016', 15),
+      OrdinalSales('2017', 25),
     ];
 
     final mobileTargetLineData = [
-      new OrdinalSales('2014', 10),
-      new OrdinalSales('2015', 5),
-      new OrdinalSales('2016', 45),
-      new OrdinalSales('2017', 35),
+      OrdinalSales('2014', 10),
+      OrdinalSales('2015', 5),
+      OrdinalSales('2016', 45),
+      OrdinalSales('2017', 35),
     ];
 
     return [
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Desktop',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
         data: desktopSalesData,
       ),
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Tablet',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
         data: tableSalesData,
       ),
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Mobile',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
         data: mobileSalesData,
       ),
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Desktop Target Line',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
@@ -219,7 +220,7 @@ class GroupedBarTargetLineChart extends StatelessWidget {
       )
         // Configure our custom bar target renderer for this series.
         ..setAttribute(charts.rendererIdKey, 'customTargetLine'),
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Tablet Target Line',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
@@ -227,7 +228,7 @@ class GroupedBarTargetLineChart extends StatelessWidget {
       )
         // Configure our custom bar target renderer for this series.
         ..setAttribute(charts.rendererIdKey, 'customTargetLine'),
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Mobile Target Line',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,