Add flutter_web samples (#75)

web/github_dataviz/lib/data/contribution_data.dart

@@ -0,0 +1,14 @@
+class ContributionData {
+  int weekTime;
+  int add;
+  int delete;
+  int change;
+
+  ContributionData(this.weekTime, this.add, this.delete, this.change);
+
+  static ContributionData fromJson(Map<String, dynamic> jsonMap) {
+    ContributionData data = ContributionData(
+        jsonMap["w"], jsonMap["a"], jsonMap["d"], jsonMap["c"]);
+    return data;
+  }
+}

web/github_dataviz/lib/data/data_series.dart

@@ -0,0 +1,6 @@
+class DataSeries {
+  String label;
+  List<int> series;
+
+  DataSeries(this.label, this.series);
+}

web/github_dataviz/lib/data/stat_for_week.dart

@@ -0,0 +1,6 @@
+class StatForWeek {
+  int weekIndex;
+  int stat;
+
+  StatForWeek(this.weekIndex, this.stat);
+}

web/github_dataviz/lib/data/user.dart

@@ -0,0 +1,12 @@
+class User {
+  int id;
+  String username;
+  String avatarUrl;
+
+  User(this.id, this.username, this.avatarUrl);
+
+  static User fromJson(Map<String, dynamic> jsonMap) {
+    User user = User(jsonMap["id"], jsonMap["login"], jsonMap["avatar_url"]);
+    return user;
+  }
+}

web/github_dataviz/lib/data/user_contribution.dart

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+import 'package:github_dataviz/data/contribution_data.dart';
+import 'package:github_dataviz/data/user.dart';
+
+class UserContribution {
+  User user;
+  List<ContributionData> contributions;
+
+  UserContribution(this.user, this.contributions);
+
+  static UserContribution fromJson(Map<String, dynamic> jsonMap) {
+    List<ContributionData> contributionList = (jsonMap["weeks"] as List)
+        .map((e) => ContributionData.fromJson(e))
+        .toList();
+    var userContribution =
+        UserContribution(User.fromJson(jsonMap["author"]), contributionList);
+    return userContribution;
+  }
+}

web/github_dataviz/lib/data/week_label.dart

@@ -0,0 +1,24 @@
+import 'package:intl/intl.dart';
+
+class WeekLabel {
+  int weekNum;
+  String label;
+
+  WeekLabel(this.weekNum, this.label);
+
+  WeekLabel.forDate(DateTime date, String label) {
+    this.label = label;
+    int year = getYear(date);
+    int weekOfYearNum = getWeekNumber(date);
+    this.weekNum = 9 + ((year - 2015) * 52) + weekOfYearNum;
+  }
+
+  int getYear(DateTime date) {
+    return int.parse(DateFormat("y").format(date));
+  }
+
+  int getWeekNumber(DateTime date) {
+    int dayOfYear = int.parse(DateFormat("D").format(date));
+    return ((dayOfYear - date.weekday + 10) / 7).floor();
+  }
+}