253 lines
7.0 KiB
Dart
253 lines
7.0 KiB
Dart
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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import 'dart:ui' as ui;
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import 'dart:math';
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class LineChartByRange extends StatelessWidget {
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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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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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}) : super(key: key);
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@override
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Widget build(BuildContext context) {
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if (showLabel.isEmpty) return const SizedBox();
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int maxTimes =
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showLabel.map((e) => e['times'] ?? 0).reduce((a, b) => a > b ? a : b);
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int yMax = (maxTimes / 10).ceil() * 10;
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if (yMax == 0) yMax = 10;
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DateTime minTime = DateTime.fromMillisecondsSinceEpoch(startTime);
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DateTime maxTime = DateTime.fromMillisecondsSinceEpoch(endTime);
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return Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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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: showLabel,
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yMax: yMax,
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minTime: minTime,
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maxTime: maxTime,
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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 yMax;
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final DateTime minTime;
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final DateTime maxTime;
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_LineChartByRangePainter({
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required this.data,
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required this.yMax,
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required this.minTime,
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required this.maxTime,
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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; // X轴标签缩进距离
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// 绘图X轴起止点，考虑内缩labelInset
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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 linePaint = Paint()
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..style = PaintingStyle.stroke
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..strokeWidth = 3.rpx
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..color = stringToColor("#00C1AA")
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..strokeCap = StrokeCap.round;
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Paint fillCirclePaint = Paint()
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..style = PaintingStyle.fill
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..color = stringToColor("#00C1AA");
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// 1. 先绘制数据线段及起止点圆点
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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 +
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chartWidth * (start - minTime.millisecondsSinceEpoch) / totalDuration;
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double endX = xStart +
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chartWidth * (end - minTime.millisecondsSinceEpoch) / totalDuration;
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double y = chartHeight * (1 - times / yMax);
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// 画线段
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canvas.drawLine(Offset(startX, y), Offset(endX, y), linePaint);
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// 画起点圆点
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canvas.drawCircle(Offset(startX, y), 4.rpx, fillCirclePaint);
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// 画终点圆点
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canvas.drawCircle(Offset(endX, y), 4.rpx, fillCirclePaint);
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}
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// 2. Y轴辅助线及文字
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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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for (int i = 0; i <= 6; i++) {
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double y = chartHeight * i / 6;
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if (i == 6) {
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// 实线
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canvas.drawLine(Offset(xStart, y), Offset(xEnd, y), axisPaint);
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} else {
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// 虚线
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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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// Y轴文字
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TextPainter tp = TextPainter(
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text: TextSpan(
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text: '${yMax - (yMax * i / 6).round()}',
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style: TextStyle(
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fontSize: 18.rpx, color: themeController.currentColor.sc4),
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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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// 3. X轴线
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canvas.drawLine(
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Offset(xStart, chartHeight), Offset(xEnd, chartHeight), axisPaint);
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// 4. 画X轴时间点对应的垂直虚线辅助线
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int totalHours = maxTime.difference(minTime).inHours;
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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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// // 垂直虚线
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// drawDashedLine(
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// canvas,
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// Offset(x, 0),
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// Offset(x, chartHeight),
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// axisPaint,
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// dashWidth: 4.rpx,
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// dashSpace: 4.rpx,
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// );
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// }
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// 5. 画左侧完整时分 (HH:mm)，往内缩 labelInset
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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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// 6. 画右侧完整时分 (HH:mm)，往内缩 labelInset
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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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// 7. 中间小时数字(23, 0, 1, 2, ...)
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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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