63 lines
2.0 KiB
Dart
63 lines
2.0 KiB
Dart
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import 'dart:async';
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import 'dart:math' as math;
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import '../domain/entities/reverse_camera_data.dart';
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/// 倒车影像数据源抽象：UI/Cubit 只依赖这个流，不关心数据真假。
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abstract class ReverseCameraSource {
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Stream<ReverseCameraData> get dataStream;
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void start();
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Future<void> stop();
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}
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/// Mock 源：嵌入式未就绪前，制造会“动起来”的假数据用于联调动画。
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///
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/// 将来接入真实数据时，只需在 Cubit 里把这里换成基于
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/// MQTT vehicleStream / TCP 0x02 回包解析的实现类，其余 UI / state 全不动。
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class MockReverseCameraSource implements ReverseCameraSource {
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final StreamController<ReverseCameraData> _controller =
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StreamController<ReverseCameraData>.broadcast();
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Timer? _timer;
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final math.Random _rnd = math.Random();
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int _tick = 0;
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@override
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Stream<ReverseCameraData> get dataStream => _controller.stream;
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@override
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void start() {
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stop();
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// ~15Hz 推送，动画足够顺滑；将来真数据 5~10Hz 也够用。
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_timer = Timer.periodic(const Duration(milliseconds: 66), (Timer t) {
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_tick++;
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// 转向角做正弦摆动（模拟倒车打方向），速度小幅抖动，距离缓慢变化便于测颜色刻度。
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final double sway = math.sin(_tick / 6.0) * 28.0; // -28° ~ +28°
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final double speed = 0.3 + _rnd.nextDouble() * 0.5; // 0.3 ~ 0.8 m/s
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final int dist = 40 + (_tick % 160); // 40 ~ 199cm，循环变化
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_controller.add(
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ReverseCameraData(
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gear: 2, // 假数据默认处于“倒车挡”，进页面即可看到动画
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steeringAngle: sway,
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speed: speed,
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rearDistanceCm: dist,
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),
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);
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});
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}
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@override
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Future<void> stop() async {
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_timer?.cancel();
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_timer = null;
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if (!_controller.isClosed) {
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_controller.add(const ReverseCameraData.idle());
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}
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}
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/// 释放流控制器（Cubit close 时调用，避免资源泄漏）。
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Future<void> dispose() async {
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await stop();
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await _controller.close();
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}
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}
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