89 lines
2.6 KiB
Dart
89 lines
2.6 KiB
Dart
import 'package:fl_chart/fl_chart.dart';
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import 'package:flutter/material.dart';
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import 'package:intl/intl.dart' as intl;
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import 'dart:math';
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import '../model/reading.dart';
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class ReadingGraph extends StatelessWidget {
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const ReadingGraph({super.key, required List<Reading> readings})
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: _readings = readings;
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final List<Reading> _readings;
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@override
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Widget build(BuildContext context) {
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if (_readings.isEmpty) {
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return Text('No readings on record.');
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}
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final spots = _readings
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.map<FlSpot>(
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(e) => FlSpot(
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e.dateTime.millisecondsSinceEpoch.toDouble() / 1000 / 60,
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e.value),
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)
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.toList();
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return LineChart(
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LineChartData(
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maxY: _readings.map<double>((e) => e.value).reduce(max) + 0.05,
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minY: _readings.map<double>((e) => e.value).reduce(min) - 0.05,
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lineBarsData: [
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LineChartBarData(
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isCurved: true,
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color: Colors.cyan,
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barWidth: 2,
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isStrokeCapRound: true,
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dotData: const FlDotData(show: false),
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spots: _readings
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.map<FlSpot>(
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(e) => FlSpot(
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e.dateTime.millisecondsSinceEpoch.toDouble() / 1000 / 60,
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e.value),
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)
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.toList(),
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)
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],
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titlesData: FlTitlesData(
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bottomTitles: getBottomTitles(spots),
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topTitles: const AxisTitles(sideTitles: SideTitles()),
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rightTitles: const AxisTitles(sideTitles: SideTitles()),
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),
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),
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);
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}
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AxisTitles getBottomTitles(List<FlSpot> spots) {
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final maxX = double.parse(
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spots.map<double>((e) => (e.x)).reduce(max).toStringAsFixed(0));
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final minX = double.parse(
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spots.map<double>((e) => e.x).reduce(min).toStringAsFixed(0));
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final middle =
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double.parse(spots[spots.length ~/ 2].x.toStringAsFixed(0)) + 4;
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return AxisTitles(
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sideTitles: SideTitles(
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interval: 1,
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showTitles: true,
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getTitlesWidget: (value, meta) {
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String text = '';
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if (value == maxX) {
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text = getDate(spots.first.x);
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} else if (double.parse(value.toStringAsFixed(0)) == minX) {
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text = getDate(spots.last.x);
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} else if (value == middle) {
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text = getDate(middle);
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}
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return Text(text);
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},
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),
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);
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}
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String getDate(double value) {
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intl.DateFormat hmFormat = intl.DateFormat('Hm');
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return hmFormat.format(
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DateTime.fromMillisecondsSinceEpoch((value * 1000 * 60).toInt()));
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}
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}
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