285 lines
8.3 KiB
Dart
285 lines
8.3 KiB
Dart
import 'dart:ui' as ui;
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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/color/appConstants.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 BarData {
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final int st; // 起始时间（毫秒）
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final int et; // 结束时间（毫秒）
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final double value; // 柱子高度
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final int id;
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final String name;
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final Color color;
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BarData({
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required this.st,
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required this.et,
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required this.value,
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required this.id,
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required this.name,
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required this.color,
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});
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}
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class BarChartWidget extends StatefulWidget {
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final List<BarData> data;
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final int startTime; // 毫秒时间戳
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final int endTime; // 毫秒时间戳
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final double maxYValue; // Y轴最大值
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final int yStepCount; // Y轴分段数
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const BarChartWidget({
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super.key,
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required this.data,
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required this.startTime,
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required this.endTime,
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required this.maxYValue,
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this.yStepCount = 5,
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});
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@override
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State<BarChartWidget> createState() => _BarChartWidgetState();
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}
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class _BarChartWidgetState extends State<BarChartWidget> {
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BarData? selectedBar;
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void _handleTapOrDrag(Offset localPosition, Size size) {
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final chartWidth = size.width - 30.rpx;
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final totalDuration = widget.endTime - widget.startTime;
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for (final d in widget.data) {
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final left =
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((d.st - widget.startTime) / totalDuration) * chartWidth + 30.rpx;
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final right =
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((d.et - widget.startTime) / totalDuration) * chartWidth + 30.rpx;
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if (localPosition.dx >= left && localPosition.dx <= right) {
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setState(() {
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selectedBar = d;
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});
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return;
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}
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}
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setState(() {
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selectedBar = null;
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});
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}
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@override
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Widget build(BuildContext context) {
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return LayoutBuilder(builder: (context, constraints) {
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return GestureDetector(
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behavior: HitTestBehavior.opaque,
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onPanDown: (details) =>
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_handleTapOrDrag(details.localPosition, constraints.biggest),
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onPanUpdate: (details) =>
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_handleTapOrDrag(details.localPosition, constraints.biggest),
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onTapDown: (details) =>
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_handleTapOrDrag(details.localPosition, constraints.biggest),
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child: CustomPaint(
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size: Size(double.infinity, 500.rpx),
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painter: BarChartPainter(
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widget.data,
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widget.startTime,
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widget.endTime,
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maxYValue: widget.maxYValue,
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yStepCount: widget.yStepCount,
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selectedBar: selectedBar,
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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 BarChartPainter extends CustomPainter {
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final List<BarData> data;
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final int startTime;
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final int endTime;
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final double maxYValue;
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final int yStepCount;
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final BarData? selectedBar;
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final double topPadding = 0;
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final double bottomPadding = 0;
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final double leftPadding = 30.rpx;
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BarChartPainter(
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this.data,
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this.startTime,
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this.endTime, {
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required this.maxYValue,
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this.yStepCount = 5,
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this.selectedBar,
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});
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@override
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void paint(Canvas canvas, Size size) {
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final chartWidth = size.width - leftPadding;
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final chartHeight = size.height - topPadding - bottomPadding;
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final totalDuration = endTime - startTime;
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final textPainter = TextPainter(textDirection: ui.TextDirection.ltr);
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final stepValue = maxYValue / yStepCount;
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// Y轴刻度
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for (int i = 0; i <= yStepCount; i++) {
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final value = stepValue * i;
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final y = topPadding + chartHeight - (value / maxYValue) * chartHeight;
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final dashPaint = Paint()
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..color = Colors.grey.withOpacity(0.5)
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..strokeWidth = 0.5;
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drawDashedLine(
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canvas, Offset(leftPadding, y), Offset(size.width, y), dashPaint);
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textPainter.text = TextSpan(
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text: value.toStringAsFixed(0),
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style: TextStyle(
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fontSize: 20.rpx,
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color: themeController.currentColor.sc4,
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),
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);
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textPainter.layout();
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textPainter.paint(
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canvas,
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Offset(leftPadding - textPainter.width - 4, y - textPainter.height / 2),
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);
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}
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// X轴刻度
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final startDate = DateTime.fromMillisecondsSinceEpoch(startTime);
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final endDate = DateTime.fromMillisecondsSinceEpoch(endTime);
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final hourStep = const Duration(hours: 1);
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final xAxisY = topPadding + chartHeight;
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for (DateTime t = startDate; t.isBefore(endDate); t = t.add(hourStep)) {
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final x = ((t.millisecondsSinceEpoch - startTime) / totalDuration) *
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chartWidth +
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leftPadding;
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final timeLabel = (t == startDate || t == endDate)
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? DateFormat('HH:mm').format(t)
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: DateFormat('h').format(t);
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textPainter.text = TextSpan(
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text: timeLabel,
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style: TextStyle(
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fontSize: AppConstants().smaller_text_fontSize,
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color: themeController.currentColor.sc4,
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),
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);
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textPainter.layout();
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textPainter.paint(canvas, Offset(x - textPainter.width / 2, xAxisY + 4));
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}
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// 额外终点标签
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final endX =
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((endTime - startTime) / totalDuration) * chartWidth + leftPadding;
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final endLabel = DateFormat('HH:mm').format(endDate);
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textPainter.text = TextSpan(
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text: endLabel,
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style: TextStyle(
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fontSize: AppConstants().smaller_text_fontSize,
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color: themeController.currentColor.sc4,
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),
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);
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textPainter.layout();
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textPainter.paint(canvas, Offset(endX - textPainter.width / 2, xAxisY + 4));
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// 柱子绘制 & 提示信息缓存
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Offset? tipOffset;
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Size? tipSize;
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String? tipText;
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Color tipColor = Colors.black;
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for (final d in data) {
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final left =
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((d.st - startTime) / totalDuration) * chartWidth + leftPadding;
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final right =
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((d.et - startTime) / totalDuration) * chartWidth + leftPadding;
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final barHeight = (d.value / maxYValue) * chartHeight;
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final top = topPadding + chartHeight - barHeight;
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final barPaint = Paint()..color = d.color;
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canvas.drawRect(
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Rect.fromLTRB(left, top, right, topPadding + chartHeight),
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barPaint,
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);
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// 缓存 tip 信息
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if (selectedBar == d) {
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tipText =
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'${d.name}\n${d.value.toStringAsFixed(1)}\n${MyUtils.formatToHHmm(d.st)}';
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final tp = TextPainter(
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text: TextSpan(
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text: tipText,
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style: TextStyle(fontSize: 16.rpx, color: Colors.white),
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),
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textAlign: TextAlign.center,
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textDirection: ui.TextDirection.ltr,
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);
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tp.layout();
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final tipWidth = tp.width + 20.rpx;
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final tipHeight = tp.height + 10.rpx;
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final tipLeft = left + (right - left) / 2 - tipWidth / 2;
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final tipTop = top - tipHeight - 10.rpx;
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tipOffset = Offset(tipLeft, tipTop);
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tipSize = Size(tipWidth, tipHeight);
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tipColor = Colors.black.withOpacity(0.8);
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}
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}
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// 绘制 tip（在柱子之上）
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if (tipText != null && tipOffset != null && tipSize != null) {
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final rect = RRect.fromRectAndRadius(
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Rect.fromLTWH(
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tipOffset.dx, tipOffset.dy, tipSize.width, tipSize.height),
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Radius.circular(8.rpx),
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);
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final tipBgPaint = Paint()..color = tipColor;
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canvas.drawRRect(rect, tipBgPaint);
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final tipTextPainter = TextPainter(
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text: TextSpan(
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text: tipText,
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style: TextStyle(fontSize: 16.rpx, color: Colors.white),
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),
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textAlign: TextAlign.center,
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textDirection: ui.TextDirection.ltr,
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);
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tipTextPainter.layout();
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tipTextPainter.paint(
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canvas,
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Offset(tipOffset.dx + 10.rpx, tipOffset.dy + 5.rpx),
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);
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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(Canvas canvas, Offset start, Offset end, Paint paint,
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{double dashWidth = 5, double dashSpace = 3}) {
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double totalLength = (end.dx - start.dx).abs();
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double dashCount = (totalLength / (dashWidth + dashSpace)).floorToDouble();
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double dx = start.dx;
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final dy = start.dy;
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for (int i = 0; i < dashCount; i++) {
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final from = Offset(dx, dy);
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final to = Offset(dx + dashWidth, dy);
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canvas.drawLine(from, to, paint);
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dx += dashWidth + dashSpace;
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}
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}
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}
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