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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:simple_animations/simple_animations/controlled_animation.dart'; | ||
| import 'package:simple_animations/simple_animations/multi_track_tween.dart'; | ||
|
|
||
| class AnimatedBackground extends StatelessWidget { | ||
| @override | ||
| Widget build(BuildContext context) { | ||
| final tween = MultiTrackTween([ | ||
| Track("color1").add(Duration(seconds: 3), | ||
| ColorTween(begin: Color(0xffD38312), end: Colors.lightBlue.shade900)), | ||
| Track("color2").add(Duration(seconds: 3), | ||
| ColorTween(begin: Color(0xffA83279), end: Colors.blue.shade600)) | ||
| ]); | ||
|
|
||
| return ControlledAnimation( | ||
| playback: Playback.MIRROR, | ||
| tween: tween, | ||
| duration: tween.duration, | ||
| builder: (context, animation) { | ||
| return Container( | ||
| decoration: BoxDecoration( | ||
| gradient: LinearGradient( | ||
| begin: Alignment.topCenter, | ||
| end: Alignment.bottomCenter, | ||
| colors: [animation["color1"], animation["color2"]])), | ||
| ); | ||
| }, | ||
| ); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| import 'dart:math'; | ||
|
|
||
| import 'package:flutter/material.dart'; | ||
| import 'package:simple_animations/simple_animations/animation_progress.dart'; | ||
| import 'package:simple_animations/simple_animations/multi_track_tween.dart'; | ||
|
|
||
| class ParticleModel { | ||
| Animatable tween; | ||
| double size; | ||
| AnimationProgress animationProgress; | ||
| Random random; | ||
| int defaultMilliseconds; | ||
|
|
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| ParticleModel(this.random, {this.defaultMilliseconds = 500}) { | ||
| restart(); | ||
| } | ||
|
|
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| restart({Duration time = Duration.zero}) { | ||
| final startPosition = Offset(-0.2 + 1.4 * random.nextDouble(), 1.2); | ||
|
|
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| final endPosition = Offset(-0.2 + 1.4 * random.nextDouble(), -0.2); | ||
|
|
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| final duration = | ||
| Duration(milliseconds: defaultMilliseconds + random.nextInt(1000)); | ||
|
|
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| tween = MultiTrackTween([ | ||
| Track("x").add( | ||
| duration, Tween(begin: startPosition.dx, end: endPosition.dx), | ||
| curve: Curves.easeInOutSine), | ||
| Track("y").add( | ||
| duration, Tween(begin: startPosition.dy, end: endPosition.dy), | ||
| curve: Curves.easeIn), | ||
| ]); | ||
| animationProgress = AnimationProgress(duration: duration, startTime: time); | ||
| size = 0.2 + random.nextDouble() * 0.4; | ||
| } | ||
|
|
||
| maintainRestart(Duration time) { | ||
| if (animationProgress.progress(time) == 1.0) { | ||
| restart(time: time); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:gsy_github_app_flutter/widget/particle/particle_model.dart'; | ||
|
|
||
| class ParticlePainter extends CustomPainter { | ||
| List<ParticleModel> particles; | ||
| Duration time; | ||
| Color color; | ||
|
|
||
| ParticlePainter(this.particles, this.time, {this.color = Colors.white}); | ||
|
|
||
| @override | ||
| void paint(Canvas canvas, Size size) { | ||
| final paint = Paint()..color = color.withAlpha(50); | ||
| particles.forEach((particle) { | ||
| var progress = particle.animationProgress.progress(time); | ||
| final animation = particle.tween.transform(progress); | ||
| final position = | ||
| Offset(animation["x"] * size.width, animation["y"] * size.height); | ||
| canvas.drawCircle(position, size.width * 0.2 * particle.size, paint); | ||
| }); | ||
| } | ||
|
|
||
| @override | ||
| bool shouldRepaint(CustomPainter oldDelegate) => true; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| import 'dart:math'; | ||
|
|
||
| import 'package:flutter/material.dart'; | ||
| import 'package:gsy_github_app_flutter/widget/particle/particle_model.dart'; | ||
| import 'package:gsy_github_app_flutter/widget/particle/particle_painter.dart'; | ||
| import 'package:simple_animations/simple_animations/rendering.dart'; | ||
|
|
||
| class ParticlesWidget extends StatefulWidget { | ||
| final int numberOfParticles; | ||
|
|
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| ParticlesWidget(this.numberOfParticles); | ||
|
|
||
| @override | ||
| _ParticlesWidgetState createState() => _ParticlesWidgetState(); | ||
| } | ||
|
|
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| class _ParticlesWidgetState extends State<ParticlesWidget> { | ||
| final Random random = Random(); | ||
|
|
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| final List<ParticleModel> particles = []; | ||
|
|
||
| @override | ||
| void initState() { | ||
| List.generate(widget.numberOfParticles, (index) { | ||
| particles.add(ParticleModel(random, defaultMilliseconds: 2000)); | ||
| }); | ||
| super.initState(); | ||
| } | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| return Rendering( | ||
| startTime: Duration(seconds: 50), | ||
| onTick: _simulateParticles, | ||
| builder: (context, time) { | ||
| _simulateParticles(time); | ||
| return CustomPaint( | ||
| painter: ParticlePainter(particles, time), | ||
| ); | ||
| }, | ||
| ); | ||
| } | ||
|
|
||
| _simulateParticles(Duration time) { | ||
| particles.forEach((particle) => particle.maintainRestart(time)); | ||
| } | ||
| } |
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