- 基础效果
- 显示节点的效果
- 显示选中的效果
- 显示y轴数据
- 多折线版本
以下是常用属性：
class LineChart extends StatefulWidget {
//数据
final List<LineChartPoint>? points;
//折线图颜色
final Color lineColor;
//折线图宽度
final double lineWidth;
//背景色
final Color bgColor;
//折线图大小
final Size size;
//水平方向的线的颜色
final Color xAxisColor;
//水平方向的线的宽度
final double xAxisWidth;
//垂直方向的线的颜色
final Color yAxisColor;
//垂直方向的线的宽度
final double yAxisWidth;
//是否绘制y轴
final bool showYAxis;
// x轴条数 最上面的一条是整个chart的顶部
final int xLineNums;
//是否显示x轴下方文字
final bool showXLineText;
//x轴下方文字颜色
final Color xLineTextColor;
///折线图上点的设置
final LineChartPointConfig? config;
///显示Y轴上的标记文案
final bool showYLineMark;
//节点选中时回调
final SelectedCallback? selectedCallback;
//多条折线
final List<List<LineChartPoint>>? multipleLinePoints;
//多条折线的颜色
final List<Color>? multipleLinePointsColor;
//自定义x轴下方的标记文案，如果传入该数据，points中的marks失效。
final List<String>? xLineMarks;
...
}
下面是最简单的使用demo
class LineChartPage extends StatelessWidget {
const LineChartPage({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text("f_line_chart"),
),
body: Center(
child: Container(
margin: const EdgeInsets.all(50),
child: LineChart(
size: const Size(300, 200),
//水平方向线条个数
xLineNums: 6,
points: _mockData(),
//是否显示x轴下面的文案
showXLineText: true,
),
),
),
);
}
List<LineChartPoint> _mockData() {
var res = <LineChartPoint>[];
res.add(LineChartPoint(xStr: "01", xValue: 1, yStr: "100", yValue: 200));
res.add(LineChartPoint(xStr: "02", xValue: 2, yStr: "200", yValue: 120));
res.add(LineChartPoint(xStr: "03", xValue: 3, yStr: "300", yValue: 150));
res.add(LineChartPoint(xStr: "04", xValue: 4, yStr: "400", yValue: 100));
res.add(LineChartPoint(xStr: "05", xValue: 5, yStr: "400", yValue: 210));
res.add(LineChartPoint(xStr: "06", xValue: 6, yStr: "400", yValue: 50));
res.add(LineChartPoint(xStr: "07", xValue: 7, yStr: "300", yValue: 150));
res.add(LineChartPoint(xStr: "08", xValue: 8, yStr: "400", yValue: 230));
res.add(LineChartPoint(xStr: "09", xValue: 9, yStr: "400", yValue: 105));
res.add(LineChartPoint(xStr: "10", xValue: 10, yStr: "400", yValue: 149));
return res;
}
}运行效果如下：
通过配置LineChartPointConfig来设置是否要显示节点，以及节点的颜色、大小等属性。
import 'package:flutter/material.dart';
///折线图节点的配置
///折线图节点的配置
class LineChartPointConfig {
//普通节点的颜色
final Color normalPonitColor;
//普通节点的半径
final double normalPointRadius;
//选中节点的颜色
final Color selectedPointColor;
//选中节点的样式
final double selectedPointRadius;
//是否显示节点
final bool showNormalPoints;
//是否显示选中节点
final bool showSelectedPoint;
//选中时的垂直线的颜色
final Color selectedLineColor;
//选中时的垂直线的宽度
final double selectedLineWidth;
//显示选中时的垂直线
final bool showSelectedLine;
LineChartPointConfig({
this.normalPonitColor = const Color(0xFF1678FF),
this.selectedPointColor = const Color(0xFF1678FF),
this.selectedLineColor = const Color(0xFFA6A6A6),
this.showSelectedLine = false,
this.selectedLineWidth = 1,
this.normalPointRadius = 2,
this.selectedPointRadius = 4,
this.showNormalPoints = false,
this.showSelectedPoint = false,
});
}
简单使用如下
body: Center(
child: Container(
margin: const EdgeInsets.all(50),
child: LineChart(
bgColor: const Color(0xFFF7F8FA),
size: const Size(300, 200),
xLineNums: 6,
points: _mockData(),
showXLineText: true,
config: LineChartPointConfig(
showNormalPoints: true,
),
),
),
),设置选中竖线和选中圆环
body: Center(
child: Container(
margin: const EdgeInsets.all(50),
child: LineChart(
bgColor: const Color(0xFFF7F8FA),
size: const Size(300, 200),
xLineNums: 6,
points: _mockData(),
showXLineText: true,
config: LineChartPointConfig(
showNormalPoints: true,
showSelectedLine: true,
showSelectedPoint: true),
),
),
),显示Y轴以及显示y轴上的单元数据。
body: Center(
child: Container(
margin: const EdgeInsets.all(50),
child: LineChart(
// bgColor: Color.fromARGB(255, 179, 216, 94),
size: const Size(300, 200),
xLineNums: 6,
points: _mockData1(),
showXLineText: true,
//显示y轴
showYAxis: true,
//显示y轴上的标记文案
showYLineMark: true,
config: LineChartPointConfig(
showNormalPoints: true,
showSelectedLine: true,
showSelectedPoint: true),
),设置节点选中回调:
LineChart(
...
selectedCallback: (offset, point) {
debugPrint(
" selectedCallback offset : x ${offset.dx} y ${offset.dy} point ${point.xStr}");
},
...
),显示多条折线
通过
multipleLinePoints设置多条折线的数据和multipleLinePointsColor设置颜色。
class LineChartPage extends StatefulWidget {
const LineChartPage({Key? key}) : super(key: key);
@override
State<LineChartPage> createState() => _LineChartPageState();
}
class _LineChartPageState extends State<LineChartPage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text("f_line_chart"),
),
body: Center(
child: Container(
margin: const EdgeInsets.all(50),
child: LineChart(
// bgColor: Color.fromARGB(255, 179, 216, 94),
size: const Size(300, 200),
xLineNums: 6,
multipleLinePoints: _mockData1(),
multipleLinePointsColor: const [
Color(0xFFFF9E3D),
Color(0xFF006BFF),
Color(0xFF24A69B),
],
showXLineText: true,
showYAxis: false,
showYLineMark: false,
// yUnit:"%", 设置Y轴单位
selectedCallback: (Offset offset, List<LineChartPoint>? points) {
//如果points==null则代表没选中
debugPrint(
" selectedCallback offset : x ${offset.dx} y ${offset.dy} ");
for (var element in points) {
debugPrint(
"selected points :${element.xValue} ${element.yValue}");
}
},
config: LineChartPointConfig(
showNormalPoints: true,
showSelectedLine: true,
showSelectedPoint: true),
),
),
),
);
}
List<List<LineChartPoint>> _mockData1() {
var res = <LineChartPoint>[];
res.add(LineChartPoint(xStr: "01", xValue: 1, yStr: "100", yValue: 102));
res.add(LineChartPoint(xStr: "02", xValue: 2, yStr: "200", yValue: 130));
res.add(LineChartPoint(xStr: "03", xValue: 3, yStr: "300", yValue: 110));
res.add(LineChartPoint(xStr: "04", xValue: 4, yStr: "400", yValue: 120));
res.add(LineChartPoint(xStr: "05", xValue: 5, yStr: "400", yValue: 170));
res.add(LineChartPoint(xStr: "06", xValue: 6, yStr: "400", yValue: 110));
res.add(LineChartPoint(xStr: "07", xValue: 7, yStr: "300", yValue: 130));
res.add(LineChartPoint(xStr: "08", xValue: 8, yStr: "400", yValue: 234));
res.add(LineChartPoint(xStr: "09", xValue: 9, yStr: "400", yValue: 110));
res.add(LineChartPoint(xStr: "10", xValue: 10, yStr: "400", yValue: 140));
var res1 = <LineChartPoint>[];
res1.add(LineChartPoint(xStr: "01", xValue: 1, yStr: "100", yValue: 110));
res1.add(LineChartPoint(xStr: "02", xValue: 2, yStr: "200", yValue: 140));
res1.add(LineChartPoint(xStr: "03", xValue: 3, yStr: "300", yValue: 120));
res1.add(LineChartPoint(xStr: "04", xValue: 4, yStr: "400", yValue: 100));
res1.add(LineChartPoint(xStr: "05", xValue: 5, yStr: "400", yValue: 160));
res1.add(LineChartPoint(xStr: "06", xValue: 6, yStr: "400", yValue: 100));
res1.add(LineChartPoint(xStr: "07", xValue: 7, yStr: "300", yValue: 120));
res1.add(LineChartPoint(xStr: "08", xValue: 8, yStr: "400", yValue: 210));
res1.add(LineChartPoint(xStr: "09", xValue: 9, yStr: "400", yValue: 70));
res1.add(LineChartPoint(xStr: "10", xValue: 10, yStr: "400", yValue: 80));
var res2 = <LineChartPoint>[];
res2.add(LineChartPoint(xStr: "01", xValue: 1, yStr: "100", yValue: 140));
res2.add(LineChartPoint(xStr: "02", xValue: 2, yStr: "200", yValue: 160));
res2.add(LineChartPoint(xStr: "03", xValue: 3, yStr: "300", yValue: 110));
res2.add(LineChartPoint(xStr: "04", xValue: 4, yStr: "400", yValue: 100));
res2.add(LineChartPoint(xStr: "05", xValue: 5, yStr: "400", yValue: 160));
res2.add(LineChartPoint(xStr: "06", xValue: 6, yStr: "400", yValue: 80));
res2.add(LineChartPoint(xStr: "07", xValue: 7, yStr: "300", yValue: 100));
res2.add(LineChartPoint(xStr: "08", xValue: 8, yStr: "400", yValue: 150));
res2.add(LineChartPoint(xStr: "09", xValue: 9, yStr: "400", yValue: 60));
res2.add(LineChartPoint(xStr: "10", xValue: 10, yStr: "400", yValue: 80));
var mutil = [res, res1, res2];
return mutil;
}效果如下：