100 lines
2.5 KiB
Dart
100 lines
2.5 KiB
Dart
import 'package:decimal/decimal.dart';
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/// K 线数据模型
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class Candle {
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final int timestamp; // 毫秒时间戳
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final Decimal open;
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final Decimal high;
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final Decimal low;
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final Decimal close;
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final Decimal volume;
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const Candle({
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required this.timestamp,
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required this.open,
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required this.high,
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required this.low,
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required this.close,
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required this.volume,
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});
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/// 从 JSON 解析，使用 Decimal 避免精度丢失
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factory Candle.fromJson(Map<String, dynamic> json) {
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return Candle(
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timestamp: json['timestamp'] as int? ?? json['time'] as int? ?? 0,
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open: _parseDecimal(json['open']),
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high: _parseDecimal(json['high']),
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low: _parseDecimal(json['low']),
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close: _parseDecimal(json['close']),
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volume: _parseDecimal(json['volume']),
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);
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}
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/// 安全解析 Decimal
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static Decimal _parseDecimal(dynamic value) {
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if (value == null) return Decimal.zero;
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if (value is Decimal) return value;
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if (value is num) return Decimal.fromJson(value.toString());
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if (value is String) {
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try {
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return Decimal.parse(value);
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} catch (_) {
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return Decimal.zero;
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}
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}
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return Decimal.zero;
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}
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Map<String, dynamic> toJson() => {
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'timestamp': timestamp,
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'open': open.toDouble(),
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'high': high.toDouble(),
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'low': low.toDouble(),
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'close': close.toDouble(),
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'volume': volume.toDouble(),
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};
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/// 转换为 double（供图表库使用）
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double get openDouble => open.toDouble();
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double get highDouble => high.toDouble();
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double get lowDouble => low.toDouble();
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double get closeDouble => close.toDouble();
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double get volumeDouble => volume.toDouble();
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/// 安全加法（防止溢出）
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Decimal safeAdd(Decimal other) {
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try {
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return open + other;
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} catch (_) {
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return Decimal.zero;
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}
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}
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/// 安全乘法（防止溢出）
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Decimal safeMultiply(Decimal other) {
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try {
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return open * other;
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} catch (_) {
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return Decimal.zero;
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}
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}
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/// 格式化价格显示
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String formatPrice({int decimalPlaces = 2}) {
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return close.toStringAsFixed(decimalPlaces);
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}
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/// 格式化成交量显示
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String formatVolume() {
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final vol = volume.toDouble();
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if (vol >= 1000000000) {
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return '${(vol / 1000000000).toStringAsFixed(2)}B';
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} else if (vol >= 1000000) {
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return '${(vol / 1000000).toStringAsFixed(2)}M';
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} else if (vol >= 1000) {
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return '${(vol / 1000).toStringAsFixed(2)}K';
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}
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return vol.toStringAsFixed(2);
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}
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}
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