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b79fee0ae2
Update min Dart constraint to 3.8, which will enable us to use the fancier collection literals. This requires bumping the min Flutter version as well: <img width="1892" height="1122" alt="image" src="https://github.com/user-attachments/assets/7c7b07fc-4d96-4987-824d-9a7133ecfb85" />
61 lines
1.7 KiB
Dart
61 lines
1.7 KiB
Dart
import 'dart:math';
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import 'package:flame/components.dart';
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import 'package:flame/events.dart';
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import 'package:flame/game.dart';
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import 'package:flame/input.dart';
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import 'package:flame/particles.dart';
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import 'package:flutter/material.dart';
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class ParticlesInteractiveExample extends FlameGame with PanDetector {
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static const description =
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'An example which shows how '
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'ParticleSystemComponent can be added in runtime '
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'following an event, in this example, the mouse '
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'dragging';
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final random = Random();
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final Tween<double> noise = Tween(begin: -1, end: 1);
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final ColorTween colorTween;
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ParticlesInteractiveExample({
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required Color from,
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required Color to,
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required double zoom,
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}) : colorTween = ColorTween(begin: from, end: to),
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super(
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camera: CameraComponent.withFixedResolution(
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width: 400,
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height: 600,
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)..viewfinder.zoom = zoom,
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);
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@override
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void onPanUpdate(DragUpdateInfo info) {
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add(
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ParticleSystemComponent(
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position: info.eventPosition.widget,
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particle: Particle.generate(
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count: 40,
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generator: (i) {
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return AcceleratedParticle(
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lifespan: 2,
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speed:
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Vector2(
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noise.transform(random.nextDouble()),
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noise.transform(random.nextDouble()),
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) *
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i.toDouble(),
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child: CircleParticle(
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radius: 2,
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paint: Paint()
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..color = colorTween.transform(random.nextDouble())!,
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),
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);
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},
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),
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),
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);
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}
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}
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