selfprivacy.org.app/lib/ui/pages/server_details/cpu_chart.dart

import 'package:flutter/material.dart';
import 'package:fl_chart/fl_chart.dart';
import 'package:selfprivacy/config/brand_colors.dart';
import 'package:selfprivacy/config/text_themes.dart';
import 'package:selfprivacy/logic/common_enum/common_enum.dart';
import 'package:selfprivacy/logic/models/hetzner_metrics.dart';
import 'package:intl/intl.dart';

class CpuChart extends StatelessWidget {
  CpuChart(this.data, this.period, this.start);

  final List<TimeSeriesData> data;
  final Period period;
  final DateTime start;

  List<FlSpot> getSpots() {
    var i = 0;
    List<FlSpot> res = [];

    for (var d in data) {
      res.add(FlSpot(i.toDouble(), d.value));
      i++;
    }

    return res;
  }

  @override
  Widget build(BuildContext context) {
    return LineChart(
      LineChartData(
        lineTouchData: LineTouchData(enabled: false),
        lineBarsData: [
          LineChartBarData(
            spots: getSpots(),
            isCurved: true,
            barWidth: 1,
            color: Colors.red,
            dotData: FlDotData(
              show: false,
            ),
          ),
        ],
        minY: 0,
        maxY: 100,
        minX: data.length - 200,
        titlesData: FlTitlesData(
          topTitles: AxisTitles(sideTitles: SideTitles(showTitles: false)),
          bottomTitles: AxisTitles(
            sideTitles: SideTitles(
              interval: 20,
              reservedSize: 50,
              getTitlesWidget: (value, titleMeta) {
                return Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: RotatedBox(
                    child: Text(bottomTitle(value.toInt()),
                        style: TextStyle(
                          fontSize: 10,
                          color: Colors.purple,
                          fontWeight: FontWeight.bold,
                        )),
                    quarterTurns: 1,
                  ),
                );
              },
              showTitles: true,
            ),
          ),
          leftTitles: AxisTitles(
            sideTitles: SideTitles(
              getTitlesWidget: (value, titleMeta) {
                return Padding(
                    padding: EdgeInsets.only(right: 15),
                    child: Text(
                      value.toInt().toString(),
                      style: progressTextStyleLight.copyWith(
                        color: Theme.of(context).brightness == Brightness.dark
                            ? BrandColors.gray4
                            : null,
                      ),
                    ));
              },
              interval: 25,
              showTitles: false,
            ),
          ),
        ),
        gridData: FlGridData(show: true),
      ),
    );
  }

  bool checkToShowTitle(
    double minValue,
    double maxValue,
    SideTitles sideTitles,
    double appliedInterval,
    double value,
  ) {
    if (value < 0) {
      return false;
    } else if (value == 0) {
      return true;
    }
    var _value = value - minValue;
    var v = _value / 20;
    return v - v.floor() == 0;
  }

  String bottomTitle(int value) {
    final hhmm = DateFormat('HH:mm');
    var day = DateFormat('MMMd');
    String res;

    if (value <= 0) {
      return '';
    }
    var time = data[value].time;
    switch (period) {
      case Period.hour:
      case Period.day:
        res = hhmm.format(time);
        break;
      case Period.month:
        res = day.format(time);
    }

    return res;
  }
}