flutter line chart(꺽은선 그래프) 구현하기2 (flutter fl_chart example)

💜Dabo (개발자 다보)·2020년 6월 3일
flutter fl_chart exampleflutter line chart fl_chartflutter line chart 구현
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Flutter Chart Library 종류

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사용한 라이브러리

https://pub.dev/packages/fl_chart


add package

dependencies:
	fl_chart: ^0.10.0


config

gridData: FlGridData Config

  • FlGridData 위젯의 show properties
LineChartData(
      gridData: FlGridData(
        show: true,
        drawVerticalLine: true,

true :

true (+drawVerticalLine: false) :

false:

  • FlLineWidget의 color와 선두께(strokeWidth) 조정 가능

full Code

LineChartData(
      gridData: FlGridData(
        ...
        getDrawingHorizontalLine: (value) {
          return FlLine(
            color: Colors.black12,
            strokeWidth: 1,
          );
        },
        getDrawingVerticalLine: (value) {
          return FlLine(
            color: Color(0xff37434d),
            strokeWidth: 5,
          );
        },
      ),



titlesData: FlTitlesData Config

  • FlGridData 위젯의 show properties
LineChartData(
      titlesData: FlTitlesData(
        show: true,
        ...

true :

false :

  • Chart의 위치(left, top, right, bottom)에 따라 leftTitles 속성의 SideTitles 위젯을 이용해 구현

full Code

leftTitles: SideTitles(
          showTitles: true,
          textStyle: const TextStyle(
            color: Color(0xff67727d),
            fontWeight: FontWeight.bold,
            fontSize: 15,
          ),
          // getTitles: 관련 축에서 주어진 값으로 제목을 검색하는 함수입니다. 큰 숫자에 대한 표시기를 표시하여 숫자 서식을 설정하려면 터치하지 마십시오.
          getTitles: (value) {
            print('leftTitles $value');
            switch (value.toInt()) {
              case 1:
                return '10k';
              case 3:
                return '30k';
              case 5:
                return '50k';
            }
            return '';
          },
          reservedSize: 28,
          margin: 12,
        ),
      ),


borderData: FlBorderData Config

  • FlBorderData의 minX: 0, maxX: 11, minY: 0, maxY: 6,
  • 꼭지점 마다 출력될FlBorderData의 lineBarsData()의 spots[]데이터
LineChartBarData(
  spots: [
    FlSpot(0, 3),
    FlSpot(2.6, 2),
    FlSpot(4.9, 5),
    FlSpot(6.8, 3.1),
    FlSpot(8, 4),
    FlSpot(9.5, 3),
    FlSpot(11, 4),
  ],

  • isCurved: false, colors: gradientColors, barWidth: 5,
  • dotData: FlDotData( show: true, ),

LineChartBarData > belowBarData: BarAreaData Config

belowBarData: BarAreaData( show: false, colors: gradientColors.map((color) => color.withOpacity(0.3)).toList(), ),

false :

true show: true,:

full code

borderData: FlBorderData(
          show: true,
          border: Border.all(color: const Color(0xff37434d), width: 1)),
      minX: 0,
      maxX: 11,
      minY: 0,
      maxY: 6,
      lineBarsData: [
        LineChartBarData(
          spots: [
            FlSpot(0, 3),
            FlSpot(2.6, 2),
            FlSpot(4.9, 5),
            FlSpot(6.8, 3.1),
            FlSpot(8, 4),
            FlSpot(9.5, 3),
            FlSpot(11, 4),
          ],
          isCurved: true,
          colors: gradientColors,
          barWidth: 5,
          isStrokeCapRound: true,
          dotData: FlDotData(
            show: false,
          ),
          belowBarData: BarAreaData(
            show: true,
            colors:
                gradientColors.map((color) => color.withOpacity(0.3)).toList(),
          ),
        ),
      ],
    );





full Code

import 'package:fl_chart/fl_chart.dart';
import 'package:flutter/material.dart';

class FlChartPage extends StatefulWidget {
  @override
  _FlChartPageState createState() => _FlChartPageState();
}

class _FlChartPageState extends State<FlChartPage> {
  List<Color> gradientColors = [
    const Color(0xff23b6e6),
    const Color(0xff02d39a),
  ];

  bool showAvg = false;

  @override
  Widget build(BuildContext context) {
    return SafeArea(
      child: Column(
        children: <Widget>[
          FlatButton(
            child: Text(
              showAvg ? '평균값 O' : '평균값 X',
              style: TextStyle(
                  color:
                      showAvg ? Colors.white.withOpacity(0.5) : Colors.white),
            ),
            onPressed: () {
              print('click');
              setState(() {
                showAvg = !showAvg;
              });
            },
          ),
          AspectRatio(
            aspectRatio: 3 / 2,
            child: Container(
              decoration: BoxDecoration(
                  borderRadius: BorderRadius.all(
                    Radius.circular(10),
                  ),
                  color: Color(0xff232d37)),
              child: Padding(
                padding: EdgeInsets.symmetric(vertical: 20, horizontal: 10),
                child: LineChart(
                  showAvg ? avgChart() : mainChart(),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  LineChartData mainChart() {
    return LineChartData(
      gridData: FlGridData(
        show: true,
        drawVerticalLine: true,
        getDrawingHorizontalLine: (value) {
          return FlLine(
            color: Color(0xff37434d),
            strokeWidth: 1,
          );
        },
        getDrawingVerticalLine: (value) {
          return FlLine(
            color: Color(0xff37434d),
            strokeWidth: 1,
          );
        },
      ),
      titlesData: FlTitlesData(
        show: true,
        bottomTitles: SideTitles(
          showTitles: true,
          reservedSize: 22,
          textStyle: const TextStyle(
              color: Color(0xff68737d),
              fontWeight: FontWeight.bold,
              fontSize: 16),
          getTitles: (value) {
            print('bottomTitles $value');
            switch (value.toInt()) {
              case 2:
                return 'MAR';
              case 5:
                return 'JUN';
              case 8:
                return 'SEP';
            }
            return '';
          },
          margin: 8,
        ),
        leftTitles: SideTitles(
          showTitles: true,
          textStyle: const TextStyle(
            color: Color(0xff67727d),
            fontWeight: FontWeight.bold,
            fontSize: 15,
          ),
          getTitles: (value) {
            print('leftTitles $value');
            switch (value.toInt()) {
              case 1:
                return '10k';
              case 3:
                return '30k';
              case 5:
                return '50k';
            }
            return '';
          },
          reservedSize: 28,
          margin: 12,
        ),
      ),
      borderData: FlBorderData(
          show: true,
          border: Border.all(color: const Color(0xff37434d), width: 1)),
      minX: 0,
      maxX: 11,
      minY: 0,
      maxY: 6,
      lineBarsData: [
        LineChartBarData(
          spots: [
            FlSpot(0, 3),
            FlSpot(2.6, 2),
            FlSpot(4.9, 5),
            FlSpot(6.8, 3.1),
            FlSpot(8, 4),
            FlSpot(9.5, 3),
            FlSpot(11, 4),
          ],
          isCurved: true,
          colors: gradientColors,
          barWidth: 5,
          isStrokeCapRound: true,
          dotData: FlDotData(
            show: true,
          ),
          belowBarData: BarAreaData(
            show: true,
            colors:
                gradientColors.map((color) => color.withOpacity(0.3)).toList(),
          ),
        ),
      ],
    );
  }

  LineChartData avgChart() {
    return LineChartData(
      lineTouchData: LineTouchData(enabled: false),
      gridData: FlGridData(
        show: true,
        drawHorizontalLine: true,
        getDrawingVerticalLine: (value) {
          return FlLine(
            color: const Color(0xff37434d),
            strokeWidth: 1,
          );
        },
        getDrawingHorizontalLine: (value) {
          return FlLine(
            color: const Color(0xff37434d),
            strokeWidth: 1,
          );
        },
      ),
      titlesData: FlTitlesData(
        show: true,
        bottomTitles: SideTitles(
          showTitles: true,
          reservedSize: 22,
          textStyle: const TextStyle(
              color: Color(0xff68737d),
              fontWeight: FontWeight.bold,
              fontSize: 16),
          getTitles: (value) {
            switch (value.toInt()) {
              case 2:
                return 'MAR';
              case 5:
                return 'JUN';
              case 8:
                return 'SEP';
            }
            return '';
          },
          margin: 8,
        ),
        leftTitles: SideTitles(
          showTitles: true,
          textStyle: const TextStyle(
            color: Color(0xff67727d),
            fontWeight: FontWeight.bold,
            fontSize: 15,
          ),
          getTitles: (value) {
            switch (value.toInt()) {
              case 1:
                return '10k';
              case 3:
                return '30k';
              case 5:
                return '50k';
            }
            return '';
          },
          reservedSize: 28,
          margin: 12,
        ),
      ),
      borderData: FlBorderData(
          show: true,
          border: Border.all(color: const Color(0xff37434d), width: 1)),
      minX: 0,
      maxX: 11,
      minY: 0,
      maxY: 6,
      lineBarsData: [
        LineChartBarData(
          spots: [
            FlSpot(0, 3.44),
            FlSpot(2.6, 3.44),
            FlSpot(4.9, 3.44),
            FlSpot(6.8, 3.44),
            FlSpot(8, 3.44),
            FlSpot(9.5, 3.44),
            FlSpot(11, 3.44),
          ],
          isCurved: true,
          colors: [
            ColorTween(begin: gradientColors[0], end: gradientColors[1])
                .lerp(0.2),
            ColorTween(begin: gradientColors[0], end: gradientColors[1])
                .lerp(0.2),
          ],
          barWidth: 5,
          isStrokeCapRound: true,
          dotData: FlDotData(
            show: false,
          ),
          belowBarData: BarAreaData(show: true, colors: [
            ColorTween(begin: gradientColors[0], end: gradientColors[1])
                .lerp(0.2)
                .withOpacity(0.1),
            ColorTween(begin: gradientColors[0], end: gradientColors[1])
                .lerp(0.2)
                .withOpacity(0.1),
          ]),
        ),
      ],
    );
  }
}
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💜Dabo (개발자 다보)
𝙸 𝚊𝚖 𝚊 𝚌𝚞𝚛𝚒𝚘𝚞𝚜 𝚍𝚎𝚟𝚎𝚕𝚘𝚙𝚎𝚛 𝚠𝚑𝚘 𝚎𝚗𝚓𝚘𝚢𝚜 𝚍𝚎𝚏𝚒𝚗𝚒𝚗𝚐 𝚊 𝚙𝚛𝚘𝚋𝚕𝚎𝚖. 🇰🇷👩🏻‍💻
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flutter line chart(꺽은선 그래프) 구현하기 (flutter bezier_chart example)

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