357 lines
10 KiB
Dart
357 lines
10 KiB
Dart
import 'dart:math';
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import 'dart:ui' as ui;
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import 'package:ef/ef.dart';
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import 'package:flutter/material.dart';
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import 'package:intl/intl.dart';
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import 'package:vbvs_app/common/util/FitTool.dart';
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import 'package:vbvs_app/common/util/MyUtils.dart';
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class LineChartByRange extends StatefulWidget {
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final List<Map<String, dynamic>> showLabel;
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final int startTime;
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final int endTime;
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final int? threshold;
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/// 新增外部指定的 Y 轴最大值
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final int maxY;
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/// Y 轴分段数，默认6段
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final int ySegments;
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const LineChartByRange({
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Key? key,
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required this.showLabel,
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required this.startTime,
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required this.endTime,
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required this.maxY,
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this.threshold,
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this.ySegments = 6,
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}) : super(key: key);
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@override
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State<LineChartByRange> createState() => _LineChartByRangeState();
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}
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class _LineChartByRangeState extends State<LineChartByRange> {
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Offset? selectedOffset;
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Map<String, dynamic>? selectedData;
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@override
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Widget build(BuildContext context) {
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if (widget.showLabel.isEmpty) return const SizedBox();
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DateTime minTime = DateTime.fromMillisecondsSinceEpoch(widget.startTime);
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DateTime maxTime = DateTime.fromMillisecondsSinceEpoch(widget.endTime);
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return GestureDetector(
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onTapDown: (details) {
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RenderBox box = context.findRenderObject() as RenderBox;
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final localPosition = box.globalToLocal(details.globalPosition);
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// 查找是否点击到某个点
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for (var item in widget.showLabel) {
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int start = item['startTime'];
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int end = item['endTime'];
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int times = item['times'];
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double chartWidth = box.size.width - 40.rpx; // 与 painter 内一致处理
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double chartHeight = box.size.height - 30.rpx;
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double xStart = 20.rpx + 12.rpx;
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int totalDuration =
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maxTime.millisecondsSinceEpoch - minTime.millisecondsSinceEpoch;
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double startX = xStart +
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chartWidth *
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(start - minTime.millisecondsSinceEpoch) /
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totalDuration;
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double y = chartHeight * (1 - times / widget.maxY);
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// 判断点击范围（圆点半径±6.rpx范围）
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if ((localPosition - Offset(startX, y)).distance < 10.rpx) {
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setState(() {
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selectedOffset = Offset(startX, y);
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selectedData = item;
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});
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return;
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}
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double endX = xStart +
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chartWidth *
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(end - minTime.millisecondsSinceEpoch) /
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totalDuration;
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if ((localPosition - Offset(endX, y)).distance < 10.rpx) {
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setState(() {
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selectedOffset = Offset(endX, y);
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selectedData = item;
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});
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return;
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}
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}
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// 没点到，清除选中
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setState(() {
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selectedOffset = null;
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selectedData = null;
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});
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},
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child: Stack(
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children: [
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SizedBox(
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height: 500.rpx,
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child: CustomPaint(
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size: Size(double.infinity, 500.rpx),
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painter: _LineChartByRangePainter(
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data: widget.showLabel,
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maxY: widget.maxY,
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minTime: minTime,
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maxTime: maxTime,
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threshold: widget.threshold,
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ySegments: widget.ySegments,
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),
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),
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),
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if (selectedOffset != null && selectedData != null)
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Positioned(
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left: selectedOffset!.dx - 60.rpx,
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top: selectedOffset!.dy - 50.rpx,
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child: Container(
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padding:
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EdgeInsets.symmetric(horizontal: 12.rpx, vertical: 8.rpx),
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decoration: BoxDecoration(
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color: Colors.black.withOpacity(0.3),
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borderRadius: BorderRadius.circular(10.rpx),
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),
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child: Text(
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'${DateFormat('HH:mm').format(DateTime.fromMillisecondsSinceEpoch(selectedData!['startTime']))} - '
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'${DateFormat('HH:mm').format(DateTime.fromMillisecondsSinceEpoch(selectedData!['endTime']))}\n'
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"时长"
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.tr +
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' ${selectedData!['times']}',
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style: TextStyle(
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fontSize: 18.rpx,
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color: Colors.white,
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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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}
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class _LineChartByRangePainter extends CustomPainter {
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final List<Map<String, dynamic>> data;
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final int maxY;
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final DateTime minTime;
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final DateTime maxTime;
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final int? threshold;
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final int ySegments;
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_LineChartByRangePainter({
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required this.data,
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required this.maxY,
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required this.minTime,
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required this.maxTime,
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this.threshold,
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this.ySegments = 6,
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});
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@override
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void paint(Canvas canvas, Size size) {
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double padding = 20.rpx;
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double labelInset = 12.rpx;
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final double xStart = padding + labelInset;
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final double xEnd = size.width - padding - labelInset;
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final double chartWidth = xEnd - xStart;
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double chartHeight = size.height - 30.rpx;
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int totalDuration =
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maxTime.millisecondsSinceEpoch - minTime.millisecondsSinceEpoch;
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if (totalDuration <= 0) return;
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Paint axisPaint = Paint()
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..color = Colors.grey.withOpacity(0.4)
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..strokeWidth = 1.rpx;
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Paint thresholdPaint = Paint()
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..color = themeController.currentColor.sc9
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..strokeWidth = 1.rpx;
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// 阈值虚线（红色）
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if (threshold != null && threshold! >= 0 && threshold! <= maxY) {
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double yThreshold = chartHeight * (1 - threshold! / maxY);
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drawDashedLine(
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canvas,
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Offset(xStart, yThreshold),
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Offset(xEnd, yThreshold),
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thresholdPaint,
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dashWidth: 8.rpx,
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dashSpace: 6.rpx,
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);
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}
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// 绘制数据线段和圆点
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for (var item in data) {
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int start = item['startTime'];
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int end = item['endTime'];
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int times = item['times'];
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double startX = xStart * 2 +
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chartWidth * (start - minTime.millisecondsSinceEpoch) / totalDuration;
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double endX = xStart * 2 +
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chartWidth * (end - minTime.millisecondsSinceEpoch) / totalDuration;
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double y = chartHeight * (1 - times / maxY);
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// 设置颜色（根据 threshold 判断）
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Color pointColor;
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if (threshold != null && times >= threshold!) {
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pointColor = themeController.currentColor.sc9;
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} else {
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pointColor = stringToColor("#00C1AA");
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}
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Paint dynamicLinePaint = Paint()
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..style = PaintingStyle.stroke
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..strokeWidth = 3.rpx
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..color = pointColor
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..strokeCap = StrokeCap.round;
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Paint dynamicCirclePaint = Paint()
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..style = PaintingStyle.fill
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..color = pointColor;
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// 画线段
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canvas.drawLine(Offset(startX, y), Offset(endX, y), dynamicLinePaint);
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// 画起点和终点圆点
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canvas.drawCircle(Offset(startX, y), 6.rpx, dynamicCirclePaint);
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canvas.drawCircle(Offset(endX, y), 6.rpx, dynamicCirclePaint);
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}
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// Y轴辅助线和文字
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for (int i = 0; i <= ySegments; i++) {
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double y = chartHeight * i / ySegments;
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if (i == ySegments) {
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canvas.drawLine(Offset(xStart, y), Offset(xEnd, y), axisPaint);
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} else {
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drawDashedLine(
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canvas,
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Offset(xStart, y),
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Offset(xEnd, y),
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axisPaint,
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dashWidth: 8.rpx,
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dashSpace: 6.rpx,
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);
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}
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TextPainter tp = TextPainter(
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text: TextSpan(
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text: '${maxY - (maxY * i / ySegments).round()}',
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style: TextStyle(
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fontSize: 18.rpx,
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color: themeController.currentColor.sc4,
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),
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),
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textDirection: ui.TextDirection.ltr,
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);
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tp.layout();
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tp.paint(canvas, Offset(0, y - tp.height / 2));
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}
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// X轴主线
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canvas.drawLine(
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Offset(xStart, chartHeight),
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Offset(xEnd, chartHeight),
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axisPaint,
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);
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// X轴时间文字（左右两侧）
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String leftLabel = DateFormat('HH:mm').format(minTime);
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TextPainter leftTp = TextPainter(
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text: TextSpan(
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text: leftLabel,
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style: TextStyle(
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fontSize: 18.rpx,
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color: themeController.currentColor.sc4,
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),
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),
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textDirection: ui.TextDirection.ltr,
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);
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leftTp.layout();
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leftTp.paint(canvas,
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Offset(padding + labelInset - leftTp.width / 2, chartHeight + 8.rpx));
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String rightLabel = DateFormat('HH:mm').format(maxTime);
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TextPainter rightTp = TextPainter(
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text: TextSpan(
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text: rightLabel,
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style: TextStyle(
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fontSize: 18.rpx,
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color: themeController.currentColor.sc4,
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),
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),
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textDirection: ui.TextDirection.ltr,
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);
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rightTp.layout();
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rightTp.paint(
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canvas,
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Offset(size.width - padding - labelInset - rightTp.width / 2,
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chartHeight + 8.rpx));
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// 中间小时刻度
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int totalHours = maxTime.difference(minTime).inHours + 1;
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int startHour = minTime.hour;
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for (int i = 1; i < totalHours; i++) {
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double x = xStart + chartWidth * i / totalHours;
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int hourLabelNum = (startHour + i) % 24;
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String hourLabel = '$hourLabelNum';
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TextPainter tp = TextPainter(
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text: TextSpan(
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text: hourLabel,
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style: TextStyle(
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fontSize: 18.rpx,
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color: themeController.currentColor.sc4,
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),
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),
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textDirection: ui.TextDirection.ltr,
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);
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tp.layout();
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tp.paint(canvas, Offset(x - tp.width / 2, chartHeight + 8.rpx));
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}
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}
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@override
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bool shouldRepaint(covariant CustomPainter oldDelegate) => true;
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void drawDashedLine(
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Canvas canvas,
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Offset start,
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Offset end,
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Paint paint, {
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required double dashWidth,
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required double dashSpace,
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}) {
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final dx = end.dx - start.dx;
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final dy = end.dy - start.dy;
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final distance = sqrt(dx * dx + dy * dy);
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final direction = Offset(dx / distance, dy / distance);
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double drawn = 0;
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while (drawn < distance) {
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final from = start + direction * drawn;
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final to = start + direction * (drawn + dashWidth).clamp(0, distance);
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canvas.drawLine(from, to, paint);
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drawn += dashWidth + dashSpace;
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}
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}
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}
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