Code improvements in the world_clock challenge

Author: Pedro Massango

lib/bubbles_rain.dart

@@ -0,0 +1,101 @@
+import 'dart:async';
+import 'dart:math';
+
+import 'package:flutter/material.dart';
+
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Bubble Rain',
+      theme: ThemeData(
+        primarySwatch: Colors.blue
+      ),
+      home: HomePage(),
+    );
+  }
+}
+
+class HomePage extends StatefulWidget {
+
+  @override
+  _HomePageState createState() => _HomePageState();
+}
+
+class _HomePageState extends State<HomePage> {
+
+  double maxScreenWith;
+  double maxScreenHeight;
+
+  @override
+  Widget build(BuildContext context) {
+    maxScreenWith = MediaQuery.of(context).size.width;
+    maxScreenHeight = MediaQuery.of(context).size.height;
+    final size = Size(maxScreenWith, maxScreenHeight);
+
+    return Scaffold(
+      body: Container(
+        height: double.infinity,
+        width: double.infinity,
+        child: GameField(size),
+      ),
+    );
+  }
+}
+
+class Circle extends StatelessWidget {
+  final Color color;
+  final double _size = 50;
+
+  const Circle({Key key, this.color = Colors.green})
+      : assert(color != null),
+        super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      width: _size,
+      height: _size,
+      decoration: BoxDecoration(
+        color: color,
+        shape: BoxShape.circle
+      ),
+    );
+  }
+}
+class CircleController {
+}
+
+class GameField extends StatefulWidget {
+  final Size size;
+  GameField(this.size);
+
+  @override
+  _GameFieldState createState() => _GameFieldState();
+}
+
+class _GameFieldState extends State<GameField> {
+
+  Size get size => widget.size;
+
+  Size _randomPosition(Size size) {
+    final x = Random().nextInt(size.width~/2);
+    final y = Random().nextInt(size.height~/2);
+    return Size(x.toDouble(), y.toDouble());
+  }
+
+  addItem(){
+
+  }
+
+
+  @override
+  Widget build(BuildContext context) {
+    return Stack(
+      children: <Widget>[
+
+        Center(child: Circle(color: Colors.orange,),)
+      ],
+    );
+  }
+}

lib/main.dart

@@ -1,4 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:flutter_challenges/transformation_example.dart';
+import 'package:flutter_challenges/number_picker.dart';
 
 void main() => runApp( MyApp());

lib/world_clock.dart

@@ -10,7 +10,6 @@ class HomePage extends StatefulWidget {
   _HomePageState createState() => _HomePageState();
 }
 
-//final Color bgColor = Color(0xFF142550);
 final Color bgColor = Colors.white;
 
 class _HomePageState extends State<HomePage> {
@@ -47,7 +46,6 @@ class _HomePageState extends State<HomePage> {
         hour = DateTime.now().second.toDouble();
         stopwatch.reset();
       }
-
       setState(() {});
     });
 
@@ -100,9 +98,8 @@ class _HomePageState extends State<HomePage> {
 
   @override
   void dispose() {
-    super.dispose();
-
     stopwatch?.stop();
+    super.dispose();
   }
 
   @override
@@ -251,7 +248,6 @@ class _HomePageState extends State<HomePage> {
 
 enum LineType{ hour, minute, second }
 
-
 class LinesPainter extends CustomPainter{
 
   final Paint linePainter;
@@ -274,13 +270,11 @@ class LinesPainter extends CustomPainter{
     final radius = size.width/2;
 
     List.generate(maxLines, (i){
-
       canvas.drawLine(
         Offset(0,  radius),
         Offset(0, radius - 8),
         linePainter
       );
-
       canvas.rotate(2 * pi / maxLines);
     });
 
@@ -315,7 +309,6 @@ class TimeLinesPainter extends CustomPainter{
 
   @override
   void paint(Canvas canvas, Size size) {
-
     final radius = size.width / 2;
 
     canvas.translate(radius, radius);