Add flutter_web samples (#75)

web/charts/example/lib/line_chart/line_gallery.dart

@@ -0,0 +1,113 @@
+// 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.
+
+import 'package:flutter_web/material.dart';
+import '../gallery_scaffold.dart';
+import 'animation_zoom.dart';
+import 'area_and_line.dart';
+import 'dash_pattern.dart';
+import 'line_annotation.dart';
+import 'points.dart';
+import 'range_annotation.dart';
+import 'range_annotation_margin.dart';
+import 'segments.dart';
+import 'simple.dart';
+import 'simple_nulls.dart';
+import 'stacked_area.dart';
+import 'stacked_area_custom_color.dart';
+import 'stacked_area_nulls.dart';
+
+List<GalleryScaffold> buildGallery() {
+  return [
+    new GalleryScaffold(
+      listTileIcon: new Icon(Icons.show_chart),
+      title: 'Simple Line Chart',
+      subtitle: 'With a single series and default line point highlighter',
+      childBuilder: () => new SimpleLineChart.withRandomData(),
+    ),
+    new GalleryScaffold(
+      listTileIcon: new Icon(Icons.show_chart),
+      title: 'Stacked Area Chart',
+      subtitle: 'Stacked area chart with three series',
+      childBuilder: () => new StackedAreaLineChart.withRandomData(),
+    ),
+    new GalleryScaffold(
+      listTileIcon: new Icon(Icons.show_chart),
+      title: 'Stacked Area Custom Color Chart',
+      subtitle: 'Stacked area chart with custom area skirt color',
+      childBuilder: () => new StackedAreaCustomColorLineChart.withRandomData(),
+    ),
+    new GalleryScaffold(
+      listTileIcon: new Icon(Icons.show_chart),
+      title: 'Area and Line Combo Chart',
+      subtitle: 'Combo chart with one line series and one area series',
+      childBuilder: () => new AreaAndLineChart.withRandomData(),
+    ),
+    new GalleryScaffold(
+      listTileIcon: new Icon(Icons.show_chart),
+      title: 'Points Line Chart',
+      subtitle: 'Line chart with points on a single series',
+      childBuilder: () => new PointsLineChart.withRandomData(),
+    ),
+    new GalleryScaffold(
+      listTileIcon: new Icon(Icons.show_chart),
+      title: 'Null Data Line Chart',
+      subtitle: 'With a single series and null measure values',
+      childBuilder: () => new SimpleNullsLineChart.withRandomData(),
+    ),
+    new GalleryScaffold(
+      listTileIcon: new Icon(Icons.show_chart),
+      title: 'Stacked Area with Nulls Chart',
+      subtitle: 'Stacked area chart with three series and null measure values',
+      childBuilder: () => new StackedAreaNullsLineChart.withRandomData(),
+    ),
+    new GalleryScaffold(
+      listTileIcon: new Icon(Icons.show_chart),
+      title: 'Dash Pattern Line Chart',
+      subtitle: 'Line chart with dash patterns',
+      childBuilder: () => new DashPatternLineChart.withRandomData(),
+    ),
+    new GalleryScaffold(
+      listTileIcon: new Icon(Icons.show_chart),
+      title: 'Segments Line Chart',
+      subtitle: 'Line chart with changes of style for each line',
+      childBuilder: () => new SegmentsLineChart.withRandomData(),
+    ),
+    new GalleryScaffold(
+      listTileIcon: new Icon(Icons.show_chart),
+      title: 'Line Annotation Line Chart',
+      subtitle: 'Line chart with line annotations',
+      childBuilder: () => new LineLineAnnotationChart.withRandomData(),
+    ),
+    new GalleryScaffold(
+      listTileIcon: new Icon(Icons.show_chart),
+      title: 'Range Annotation Line Chart',
+      subtitle: 'Line chart with range annotations',
+      childBuilder: () => new LineRangeAnnotationChart.withRandomData(),
+    ),
+    new GalleryScaffold(
+      listTileIcon: new Icon(Icons.show_chart),
+      title: 'Range Annotation Margin Labels Line Chart',
+      subtitle: 'Line chart with range annotations with labels in margins',
+      childBuilder: () => new LineRangeAnnotationMarginChart.withRandomData(),
+    ),
+    new GalleryScaffold(
+      listTileIcon: new Icon(Icons.show_chart),
+      title: 'Pan and Zoom Line Chart',
+      subtitle: 'Simple line chart pan and zoom behaviors enabled',
+      childBuilder: () => new LineAnimationZoomChart.withRandomData(),
+    ),
+  ];
+}