Adds initial version of weather to the gallery app

examples/material_gallery/flutter.yaml

@@ -7,6 +7,16 @@ assets:
   - assets/section_components.png
   - assets/section_patterns.png
   - assets/section_usability.png
+  - packages/flutter_gallery_assets/sun.png
+  - packages/flutter_gallery_assets/clouds-0.png
+  - packages/flutter_gallery_assets/clouds-1.png
+  - packages/flutter_gallery_assets/ray.png
+  - packages/flutter_gallery_assets/sun.png
+  - packages/flutter_gallery_assets/weathersprites.json
+  - packages/flutter_gallery_assets/weathersprites.png
+  - packages/flutter_gallery_assets/icon-sun.png
+  - packages/flutter_gallery_assets/icon-rain.png
+  - packages/flutter_gallery_assets/icon-snow.png
 material-design-icons:
   - name: navigation/arrow_drop_down
   - name: navigation/arrow_forward

examples/material_gallery/lib/demo/weathers_demo.dart

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:async';
+import 'dart:ui' as ui;
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_sprites/flutter_sprites.dart';
+
+ImageMap _images;
+SpriteSheet _sprites;
+
+enum WeatherType {
+  sun,
+  rain,
+  snow
+}
+
+class WeathersDemo extends StatefulComponent {
+  WeathersDemo({ Key key }) : super(key: key);
+  _WeathersDemoState createState() => new _WeathersDemoState();
+}
+
+class _WeathersDemoState extends State<WeathersDemo> {
+
+  Future _loadAssets(AssetBundle bundle) async {
+    _images = new ImageMap(bundle);
+    await _images.load(<String>[
+      'packages/flutter_gallery_assets/clouds-0.png',
+      'packages/flutter_gallery_assets/clouds-1.png',
+      'packages/flutter_gallery_assets/ray.png',
+      'packages/flutter_gallery_assets/sun.png',
+      'packages/flutter_gallery_assets/weathersprites.json',
+      'packages/flutter_gallery_assets/weathersprites.png',
+      'packages/flutter_gallery_assets/icon-sun.png',
+      'packages/flutter_gallery_assets/icon-rain.png',
+      'packages/flutter_gallery_assets/icon-snow.png'
+    ]);
+
+    String json = await DefaultAssetBundle.of(context).loadString('packages/flutter_gallery_assets/weathersprites.json');
+    _sprites = new SpriteSheet(_images['packages/flutter_gallery_assets/weathersprites.png'], json);
+  }
+
+  void initState() {
+    super.initState();
+
+    AssetBundle bundle = DefaultAssetBundle.of(context);
+    _loadAssets(bundle).then((_) {
+      setState(() {
+        assetsLoaded = true;
+        weatherWorld = new WeatherWorld();
+      });
+    });
+  }
+
+  bool assetsLoaded = false;
+
+  WeatherWorld weatherWorld;
+
+  Widget build(BuildContext context) {
+    if (!assetsLoaded) {
+      return new Scaffold(
+        toolBar: new ToolBar(
+          center: new Text("Weathers")
+        ),
+        body: new Container(
+          decoration: new BoxDecoration(
+            backgroundColor: const Color(0xff4aaafb)
+          )
+        )
+      );
+    }
+
+    return new Scaffold(
+      toolBar: new ToolBar(
+        center: new Text("Weathers")
+      ),
+      body: new Material(
+        child: new Stack(
+          children: <Widget>[
+            new SpriteWidget(weatherWorld),
+            new Align(
+              alignment: new FractionalOffset(0.5, 0.8),
+              child: new Row(
+                justifyContent: FlexJustifyContent.center,
+                children: <Widget>[
+                  new WeatherButton(
+                    onPressed: () {
+                      setState(() {
+                        weatherWorld.weatherType = WeatherType.sun;
+                      });
+                    },
+                    selected: weatherWorld.weatherType == WeatherType.sun,
+                    icon: "packages/flutter_gallery_assets/icon-sun.png"
+                  ),
+                  new WeatherButton(
+                    onPressed: () {
+                      setState(() {
+                        weatherWorld.weatherType = WeatherType.rain;
+                      });
+                    },
+                    selected: weatherWorld.weatherType == WeatherType.rain,
+                    icon: "packages/flutter_gallery_assets/icon-rain.png"
+                  ),
+                  new WeatherButton(
+                    onPressed: () {
+                      setState(() {
+                        weatherWorld.weatherType = WeatherType.snow;
+                      });
+                    },
+                    selected: weatherWorld.weatherType == WeatherType.snow,
+                    icon: "packages/flutter_gallery_assets/icon-snow.png"
+                  )
+                ]
+              )
+            )
+          ]
+        )
+      )
+    );
+  }
+}
+
+const double _kWeatherButtonSize = 56.0;
+const double _kWeatherIconSize = 36.0;
+
+class WeatherButton extends StatelessComponent {
+  WeatherButton({ this.icon, this.selected, this.onPressed, Key key }) : super(key: key);
+
+  final String icon;
+  final bool selected;
+  final VoidCallback onPressed;
+
+  Widget build(BuildContext context) {
+    Color color;
+    if (selected)
+      color = Theme.of(context).primaryColor;
+    else
+      color = const Color(0x33000000);
+
+    return new Padding(
+      padding: const EdgeDims.all(15.0),
+      child: new Material(
+        color: color,
+        type: MaterialType.circle,
+        elevation: 0,
+        child: new Container(
+          width: _kWeatherButtonSize,
+          height: _kWeatherButtonSize,
+          child: new InkWell(
+            onTap: onPressed,
+            child: new Center(
+              child: new AssetImage(
+                name: icon,
+                width: _kWeatherIconSize,
+                height: _kWeatherIconSize
+              )
+            )
+          )
+        )
+      )
+    );
+  }
+}
+
+const List<Color> _kBackgroundColorsTop = const <Color>[
+  const Color(0xff5ebbd5),
+  const Color(0xff0b2734),
+  const Color(0xffcbced7)
+];
+
+const List<Color> _kBackgroundColorsBottom = const <Color>[
+  const Color(0xff4aaafb),
+  const Color(0xff4c5471),
+  const Color(0xffe0e3ec)
+];
+
+class WeatherWorld extends NodeWithSize {
+  WeatherWorld() : super(const Size(2048.0, 2048.0)) {
+    _background = new GradientNode(
+      this.size,
+      _kBackgroundColorsTop[0],
+      _kBackgroundColorsBottom[0]
+    );
+    addChild(_background);
+
+    _cloudsSharp = new CloudLayer(
+      image: _images['packages/flutter_gallery_assets/clouds-0.png'],
+      rotated: false,
+      dark: false,
+      loopTime: 20.0
+    );
+    addChild(_cloudsSharp);
+
+    _cloudsDark = new CloudLayer(
+      image: _images['packages/flutter_gallery_assets/clouds-1.png'],
+      rotated: true,
+      dark: true,
+      loopTime: 40.0
+    );
+    addChild(_cloudsDark);
+
+    _cloudsSoft = new CloudLayer(
+      image: _images['packages/flutter_gallery_assets/clouds-1.png'],
+      rotated: false,
+      dark: false,
+      loopTime: 60.0
+    );
+    addChild(_cloudsSoft);
+
+    _sun = new Sun();
+    _sun.position = const Point(1024.0, 1024.0);
+    _sun.scale = 1.5;
+    addChild(_sun);
+
+    _rain = new Rain();
+    addChild(_rain);
+
+    _snow = new Snow();
+    addChild(_snow);
+  }
+
+  GradientNode _background;
+  CloudLayer _cloudsSharp;
+  CloudLayer _cloudsSoft;
+  CloudLayer _cloudsDark;
+  Sun _sun;
+  Rain _rain;
+  Snow _snow;
+
+  WeatherType get weatherType => _weatherType;
+
+  WeatherType _weatherType = WeatherType.sun;
+
+  void set weatherType(WeatherType weatherType) {
+    if (weatherType == _weatherType)
+      return;
+
+    _weatherType = weatherType;
+
+    // Fade the background
+    _background.actions.stopAll();
+
+    _background.actions.run(new ActionTween(
+      (Color a) => _background.colorTop = a,
+      _background.colorTop,
+      _kBackgroundColorsTop[weatherType.index],
+      1.0
+    ));
+
+    _background.actions.run(new ActionTween(
+      (Color a) => _background.colorBottom = a,
+      _background.colorBottom,
+      _kBackgroundColorsBottom[weatherType.index],
+      1.0
+    ));
+
+    _cloudsDark.active = weatherType != WeatherType.sun;
+    _sun.active = weatherType == WeatherType.sun;
+    _rain.active = weatherType == WeatherType.rain;
+    _snow.active = weatherType == WeatherType.snow;
+  }
+
+  void spriteBoxPerformedLayout() {
+    _sun.position = spriteBox.visibleArea.topLeft + const Offset(350.0, 180.0);
+  }
+}
+
+class GradientNode extends NodeWithSize {
+  GradientNode(Size size, this.colorTop, this.colorBottom) : super(size);
+
+  Color colorTop;
+  Color colorBottom;
+
+  void paint(Canvas canvas) {
+    applyTransformForPivot(canvas);
+
+    Paint gradientPaint = new Paint()..shader = new LinearGradient(
+      begin: Point.origin,
+      end: new Point(0.0, size.height),
+      colors: <Color>[colorTop, colorBottom],
+      stops: <double>[0.0, 1.0]
+    ).createShader();
+
+    canvas.drawRect(new Rect.fromLTWH(0.0, 0.0, size.width, size.height), gradientPaint);
+  }
+}
+
+class CloudLayer extends Node {
+  CloudLayer({ ui.Image image, bool dark, bool rotated, double loopTime }) {
+    _sprites.add(_createSprite(image, dark, rotated));
+    _sprites[0].position = const Point(1024.0, 1024.0);
+    addChild(_sprites[0]);
+
+    _sprites.add(_createSprite(image, dark, rotated));
+    _sprites[1].position = const Point(3072.0, 1024.0);
+    addChild(_sprites[1]);
+
+    actions.run(new ActionRepeatForever(
+      new ActionTween(
+        (Point a) => position = a,
+        Point.origin,
+        const Point(-2048.0, 0.0),
+        loopTime)
+    ));
+  }
+
+  List<Sprite> _sprites = <Sprite>[];
+
+  Sprite _createSprite(ui.Image image, bool dark, bool rotated) {
+    Sprite sprite = new Sprite.fromImage(image);
+
+    if (rotated)
+      sprite.scaleX = -1.0;
+
+    if (dark) {
+      sprite.colorOverlay = const Color(0xff000000);
+      sprite.opacity = 0.0;
+    }
+
+    return sprite;
+  }
+
+  void set active(bool active) {
+    double opacity;
+    if (active) opacity = 1.0;
+    else opacity = 0.0;
+
+    for (Sprite sprite in _sprites) {
+      sprite.actions.stopAll();
+      sprite.actions.run(new ActionTween(
+        (double a) => sprite.opacity = a,
+        sprite.opacity,
+        opacity,
+        1.0
+      ));
+    }
+  }
+}
+
+const double _kNumSunRays = 50.0;
+
+class Sun extends Node {
+  Sun() {
+    _sun = new Sprite.fromImage(_images['packages/flutter_gallery_assets/sun.png']);
+    _sun.scale = 4.0;
+    _sun.transferMode = TransferMode.plus;
+    addChild(_sun);
+
+    _rays = <Ray>[];
+    for (int i = 0; i < _kNumSunRays; i += 1) {
+      Ray ray = new Ray();
+      addChild(ray);
+      _rays.add(ray);
+    }
+  }
+
+  Sprite _sun;
+  List<Ray> _rays;
+
+  void set active(bool active) {
+    actions.stopAll();
+
+    double targetOpacity;
+    if (!active) targetOpacity = 0.0;
+    else targetOpacity = 1.0;
+
+    actions.run(
+      new ActionTween(
+        (double a) => _sun.opacity = a,
+        _sun.opacity,
+        targetOpacity,
+        2.0
+      )
+    );
+
+    if (active) {
+      for (Ray ray in _rays) {
+        actions.run(new ActionSequence([
+          new ActionDelay(1.5),
+          new ActionTween(
+            (double a) => ray.opacity = a,
+            ray.opacity,
+            ray.maxOpacity,
+            1.5
+          )
+        ]));
+      }
+    } else {
+      for (Ray ray in _rays) {
+        actions.run(new ActionTween(
+          (double a) => ray.opacity = a,
+          ray.opacity,
+          0.0,
+          0.2
+        ));
+      }
+    }
+  }
+}
+
+class Ray extends Sprite {
+  double _rotationSpeed;
+  double maxOpacity;
+
+  Ray() : super.fromImage(_images['packages/flutter_gallery_assets/ray.png']) {
+    pivot = const Point(0.0, 0.5);
+    transferMode = TransferMode.plus;
+    rotation = randomDouble() * 360.0;
+    maxOpacity = randomDouble() * 0.2;
+    opacity = maxOpacity;
+    scaleX = 2.5 + randomDouble();
+    scaleY = 0.3;
+    _rotationSpeed = randomSignedDouble() * 2.0;
+
+    // Scale animation
+    double scaleTime = randomSignedDouble() * 2.0 + 4.0;
+
+    actions.run(new ActionRepeatForever(
+      new ActionSequence([
+        new ActionTween((double a) => scaleX = a, scaleX, scaleX * 0.5, scaleTime),
+        new ActionTween((double a) => scaleX = a, scaleX * 0.5, scaleX, scaleTime)
+      ])
+    ));
+  }
+
+  void update(double dt) {
+    rotation += dt * _rotationSpeed;
+  }
+}
+
+class Rain extends Node {
+  Rain() {
+    _addParticles(1.0);
+    _addParticles(1.5);
+    _addParticles(2.0);
+  }
+
+  List<ParticleSystem> _particles = <ParticleSystem>[];
+
+  void _addParticles(double distance) {
+    ParticleSystem particles = new ParticleSystem(
+      _sprites['raindrop.png'],
+      transferMode: TransferMode.srcATop,
+      posVar: const Point(1300.0, 0.0),
+      direction: 90.0,
+      directionVar: 0.0,
+      speed: 1000.0 / distance,
+      speedVar: 100.0 / distance,
+      startSize: 1.2 / distance,
+      startSizeVar: 0.2 / distance,
+      endSize: 1.2 / distance,
+      endSizeVar: 0.2 / distance,
+      life: 1.5 * distance,
+      lifeVar: 1.0 * distance
+    );
+    particles.position = const Point(1024.0, -200.0);
+    particles.rotation = 10.0;
+    particles.opacity = 0.0;
+
+    _particles.add(particles);
+    addChild(particles);
+  }
+
+  void set active(bool active) {
+    actions.stopAll();
+    for (ParticleSystem system in _particles) {
+      if (active) {
+        actions.run(
+          new ActionTween(
+            (double a) => system.opacity = a,
+            system.opacity,
+            1.0,
+            2.0
+        ));
+      } else {
+        actions.run(
+          new ActionTween(
+            (double a) => system.opacity = a,
+            system.opacity,
+            0.0,
+            0.5
+        ));
+      }
+    }
+  }
+}
+
+class Snow extends Node {
+  Snow() {
+    _addParticles(_sprites['flake-0.png'], 1.0);
+    _addParticles(_sprites['flake-1.png'], 1.0);
+    _addParticles(_sprites['flake-2.png'], 1.0);
+
+    _addParticles(_sprites['flake-3.png'], 1.5);
+    _addParticles(_sprites['flake-4.png'], 1.5);
+    _addParticles(_sprites['flake-5.png'], 1.5);
+
+    _addParticles(_sprites['flake-6.png'], 2.0);
+    _addParticles(_sprites['flake-7.png'], 2.0);
+    _addParticles(_sprites['flake-8.png'], 2.0);
+  }
+
+  List<ParticleSystem> _particles = <ParticleSystem>[];
+
+  void _addParticles(Texture texture, double distance) {
+    ParticleSystem particles = new ParticleSystem(
+      texture,
+      transferMode: TransferMode.srcATop,
+      posVar: const Point(1300.0, 0.0),
+      direction: 90.0,
+      directionVar: 0.0,
+      speed: 150.0 / distance,
+      speedVar: 50.0 / distance,
+      startSize: 1.0 / distance,
+      startSizeVar: 0.3 / distance,
+      endSize: 1.2 / distance,
+      endSizeVar: 0.2 / distance,
+      life: 20.0 * distance,
+      lifeVar: 10.0 * distance,
+      emissionRate: 2.0,
+      startRotationVar: 360.0,
+      endRotationVar: 360.0,
+      radialAccelerationVar: 10.0 / distance,
+      tangentialAccelerationVar: 10.0 / distance
+    );
+    particles.position = const Point(1024.0, -50.0);
+    particles.opacity = 0.0;
+
+    _particles.add(particles);
+    addChild(particles);
+  }
+
+  void set active(bool active) {
+    actions.stopAll();
+    for (ParticleSystem system in _particles) {
+      if (active) {
+        actions.run(
+          new ActionTween((double a) => system.opacity = a, system.opacity, 1.0, 2.0
+        ));
+      } else {
+        actions.run(
+          new ActionTween((double a) => system.opacity = a, system.opacity, 0.0, 0.5
+        ));
+      }
+    }
+  }
+}

examples/material_gallery/lib/main.dart

@@ -16,6 +16,7 @@ import 'demo/slider_demo.dart';
 import 'demo/tabs_demo.dart';
 import 'demo/time_picker_demo.dart';
 import 'demo/two_level_list_demo.dart';
+import 'demo/weathers_demo.dart';
 
 class GalleryDemo {
   GalleryDemo({ this.title, this.builder });
@@ -147,7 +148,10 @@ class GalleryHome extends StatelessComponent {
                 new GallerySection(
                   title: 'Animation',
                   image: 'assets/section_animation.png',
-                  colors: Colors.purple
+                  colors: Colors.purple,
+                  demos: <GalleryDemo>[
+                    new GalleryDemo(title: 'Weathers', builder: (BuildContext context) => new WeathersDemo())
+                  ]
                 ),
                 new GallerySection(
                   title: 'Style',

examples/material_gallery/pubspec.yaml

@@ -4,3 +4,6 @@ dependencies:
 
   flutter:
     path: ../../packages/flutter
+  flutter_sprites:
+    path: ../../packages/flutter_sprites
+  flutter_gallery_assets: '0.0.2'