Flutter之Graphic图表的简单示例-编程知识

简介

Graphic是一个数据可视化语法和Flutter图表库。

在这里插入图片描述
官方github示例
我的gitee示例

网上可用资源很少，只有作者的几篇文章，并且没有特别详细的文档，使用的话还是需要一定的时间去调研，在此简单记录。

示例

以折线图为例（因为我只用到了折线图，但其他的图大差不差）

创建一个两个文件：linePage.dart和数据文件data.dart
创建main.dart，引入linePage.dart

// main.dart
import 'package:flutter/material.dart';
import './linePage.dart';void main() => runApp(const MyApp());class MyApp extends StatelessWidget {const MyApp({super.key});@overrideWidget build(BuildContext context) {return MaterialApp(title: 'Flutter Graphic Example',debugShowCheckedModeBanner: false,home: Scaffold(appBar: AppBar(title: const Text('Flutter Graphic Example'),),body: linePage(),));}
}

// linePage.dart 
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:graphic/graphic.dart';
import 'package:intl/intl.dart';import './data.dart';class linePage extends StatelessWidget {linePage({super.key});final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();@overrideWidget build(BuildContext context) {return SingleChildScrollView(child: Center(child: Column(children: <Widget>[Container(padding: const EdgeInsets.fromLTRB(20, 40, 20, 5),child: const Text('Smooth Line and Area chart', //单线style: TextStyle(fontSize: 20),),),Container(margin: const EdgeInsets.only(top: 10),width: 350,height: 300,child: Chart(// 数据源data: invalidData,// 变量配置variables: {'date': Variable(accessor: (Map map) => map['date'] as String,scale: OrdinalScale(tickCount: 5, // x轴刻度数量),),'points': Variable(// 数据值accessor: (Map map) => (map['points'] ?? double.nan) as num,),},marks: [// 线条与X轴之间区域填充AreaMark(shape: ShapeEncode(value:BasicAreaShape(smooth: true), // smooth: true 使线条变得平滑),color: ColorEncode(value: Colors.pink.withAlpha(80),),),// 线条LineMark(shape: ShapeEncode(value: BasicLineShape(smooth: true),),// 粗细size: SizeEncode(value: 1.5),),],// 坐标轴配置axes: [Defaults.horizontalAxis,Defaults.verticalAxis,],/** 选项配置* 可以写多个，提供给tooltip单独配置selections：{‘touchMove’}选择* 或者marks中LineMark的color属性的updaters*/selections: {// 'touchMove'名称随意起，一般与是功能性描述词'touchMove': PointSelection(on: { //on里面配置操作选项GestureType.scaleUpdate, // 可垂直或水平移动准线GestureType.tapDown,     // 点击GestureType.longPressMoveUpdate  //长按拖动},dim: Dim.x,)},// 触摸弹框提示tooltip: TooltipGuide(//未单独配置 selections，默认使用上面的selections中配置// 跟随鼠标位置（感觉主要是看第二项是true，tooltip框才会跟随，false会随着鼠标移动乱动）followPointer: [false, true],align: Alignment.topLeft, // tooltip弹框对于点击位置的对齐方式offset: const Offset(-20, -20), //  位置偏移量，结合align),// 十字准线crosshair: CrosshairGuide(followPointer: [false, true]),),),Container(padding: const EdgeInsets.fromLTRB(20, 40, 20, 5),child: const Text('Group interactions', //多线style: TextStyle(fontSize: 20),),),Container(margin: const EdgeInsets.only(top: 10),width: 350,height: 300,child: Chart(data: invalidData1,// 根据给定线条数据的name值相同的为同一条线variables: {'date': Variable(accessor: (Map map) => map['date'] as String,scale: OrdinalScale(tickCount: 5, inflate: true),),'points': Variable(accessor: (Map map) => (map['points'] ?? double.nan) as num,),'name': Variable(accessor: (Map map) => map['name'] as String,),},coord: RectCoord(horizontalRange: [0.1, 0.99]),marks: [LineMark(position:Varset('date') * Varset('points') / Varset('name'),shape: ShapeEncode(value: BasicLineShape(smooth: true)),size: SizeEncode(value: 1.5),color: ColorEncode(variable: 'name',values: Defaults.colors10,// 改变线条颜色// updaters: {// 'groupMouse'是在selections中配置的//   'groupMouse': {false: (color) => color.withAlpha(100)},//   // 'groupTouch': {false: (color) => color.withAlpha(100)},// },),),// 显示线条上的数据点// PointMark(//   color: ColorEncode(//     variable: 'name',//     values: Defaults.colors10,//     updaters: {//       'groupMouse': {false: (color) => color.withAlpha(100)},//       'groupTouch': {false: (color) => color.withAlpha(100)},//     },//   ),// ),],axes: [Defaults.horizontalAxis,Defaults.verticalAxis,],// // 提示框选项配置selections: {'666': PointSelection(on: {GestureType.hover, GestureType.tap},// 设备[mouse(鼠标),stylus(手写笔),invertedStylus,trackpad(触控板)，touch(触摸屏)，unknown]// 参考资料：https://api.flutter.dev/flutter/dart-ui/PointerDeviceKind.htmldevices: {PointerDeviceKind.mouse // 鼠标 （该配置在鼠标设备时生效）},// 显示此处date相同的数据variable: 'date',),'groupMouse': PointSelection(// 触发的交互// 参考资料：https://pub.dev/documentation/keyboard_dismisser/latest/keyboard_dismisser/GestureType.htmlon: {GestureType.hover, // 覆盖},// variable: 'name',devices: {PointerDeviceKind.mouse},),'tooltipTouch': PointSelection(on: {GestureType.scaleUpdate, GestureType.tapDown, //点击GestureType.longPressMoveUpdate },// variable: 'name',devices: {PointerDeviceKind.touch，  // 触摸屏（仅在触摸设备生效：神奇的是不包括iOS）},),'tooltipTouchIos': PointSelection(on: {GestureType.scaleUpdate,GestureType.tapDown,GestureType.longPressMoveUpdate},// variable: 'name',devices: {// 未知设备（不明白为啥iOS被识别成了unknown，猜测可能与ios中的触摸事件有关）PointerDeviceKind.unknown, },),},tooltip: TooltipGuide(// 选择触发配置selections: {'tooltipTouch', '666'},followPointer: [false, true],align: Alignment.topLeft,// tooltip中显示的内容（按顺序显示）// 与上方selections中定义的variable相排斥variables: [// 'date','name','points',],),// 十字准线配置crosshair: CrosshairGuide(selections: {'tooltipTouch', '666'},styles: [PaintStyle(strokeColor: const Color.fromARGB(255, 92, 68, 68)),PaintStyle(strokeColor: const Color.fromARGB(0, 158, 154, 154)),],followPointer: [false, true],),),),],),),);}
}

数据文件

// data.dart
const invalidData1 = [{"date": "2016-01-04", "name": "线条1", "points": 126.12},{"date": "2016-01-05", "name": "线条1", "points": 125.688},{"date": "2016-01-06", "name": "线条1", "points": 119.704},{"date": "2016-01-07", "name": "线条1", "points": 120.19},{"date": "2016-01-08", "name": "线条1", "points": 121.157},{"date": "2016-01-11", "name": "线条1", "points": 117},{"date": "2016-01-12", "name": "线条1", "points": 120},{"date": "2016-01-13", "name": "线条1", "points": 122},{"date": "2016-01-14", "name": "线条1", "points": 117.76},{"date": "2016-01-15", "name": "线条1", "points": 114.397},{"date": "2016-01-18", "name": "线条1", "points": 116.373},{"date": "2016-01-19", "name": "线条1", "points": 120.547},{"date": "2016-01-20", "name": "线条1", "points": 113.733},{"date": "2016-01-21", "name": "线条1", "points": 114.098},{"date": "2016-01-22", "name": "线条1", "points": 123.833},{"date": "2016-01-25", "name": "线条1", "points": 125},{"date": "2016-01-26", "name": "线条1", "points": 124.866},{"date": "2016-01-27", "name": "线条1", "points": 120.264},{"date": "2016-01-28", "name": "线条1", "points": 122.296},{"date": "2016-01-29", "name": "线条1", "points": 124.502},{"date": "2016-02-01", "name": "线条1", "points": 127.936},{"date": "2016-02-02", "name": "线条1", "points": null},{"date": "2016-02-03", "name": "线条1", "points": 129.95},{"date": "2016-02-04", "name": "线条1", "points": 129.275},{"date": "2016-02-05", "name": "线条1", "points": 127.898},{"date": "2016-02-08", "name": "线条1", "points": 134.9},{"date": "2016-02-09", "name": "线条1", "points": 122.819},{"date": "2016-02-10", "name": "线条1", "points": 120.108},{"date": "2016-02-11", "name": "线条1", "points": 119.447},{"date": "2016-02-12", "name": "线条1", "points": 117.8},{"date": "2016-02-15", "name": "线条1", "points": null},{"date": "2016-02-16", "name": "线条1", "points": 121.865},{"date": "2016-02-17", "name": "线条1", "points": 126.3},{"date": "2016-02-18", "name": "线条1", "points": 128.259},{"date": "2016-02-19", "name": "线条1", "points": 125.724},{"date": "2016-02-22", "name": "线条1", "points": 130},{"date": "2016-02-23", "name": "线条1", "points": 129.948},{"date": "2016-02-24", "name": "线条1", "points": 132.5},{"date": "2016-02-25", "name": "线条1", "points": 128.08},{"date": "2016-02-26", "name": "线条1", "points": 122},{"date": "2016-02-29", "name": "线条1", "points": 122},{"date": "2016-03-01", "name": "线条1", "points": 123.449},{"date": "2016-03-02", "name": "线条1", "points": double.nan},{"date": "2016-03-03", "name": "线条1", "points": 132},{"date": "2016-03-04", "name": "线条1", "points": 135},{"date": "2016-03-07", "name": "线条1", "points": 123.905},{"date": "2016-03-08", "name": "线条1", "points": 125.155},{"date": "2016-03-09", "name": "线条1", "points": 126},{"date": "2016-03-10", "name": "线条1", "points": 126.778},{"date": "2016-03-11", "name": "线条1", "points": 129.656},{"date": "2016-03-14", "name": "线条1", "points": 127.64},{"date": "2016-03-15", "name": "线条1", "points": 124.786},{"date": "2016-03-16", "name": "线条1", "points": 124.469},{"date": "2016-03-17", "name": "线条1", "points": 123.5},{"date": "2016-03-18", "name": "线条1", "points": 124.061},{"date": "2016-03-21", "name": "线条1", "points": 123.5},{"date": "2016-03-22", "name": "线条1", "points": 129.002},{"date": "2016-03-23", "name": "线条1", "points": 129},{"date": "2016-03-24", "name": "线条1", "points": 131.31},{"date": "2016-03-29", "name": "线条1", "points": 133},{"date": "2016-03-30", "name": "线条1", "points": 129.298},{"date": "2016-03-31", "name": "线条1", "points": 127.4},{"date": "2016-04-01", "name": "线条1", "points": 122.376},{"date": "2016-04-04", "name": "线条1", "points": 119.467},{"date": "2016-04-05", "name": "线条1", "points": 120.695},{"date": "2016-04-06", "name": "线条1", "points": 118.725},{"date": "2016-04-07", "name": "线条1", "points": 127.539},{"date": "2016-04-08", "name": "线条1", "points": 129.8},{"date": "2016-04-11", "name": "线条1", "points": 129.5},{"date": "2016-04-12", "name": "线条1", "points": 134.465},{"date": "2016-04-13", "name": "线条1", "points": 133},{"date": "2016-04-14", "name": "线条1", "points": 137.35},{"date": "2016-04-15", "name": "线条1", "points": 137.2},{"date": "2016-04-18", "name": "线条1", "points": 132.611},{"date": "2016-04-19", "name": "线条1", "points": 135.479},{"date": "2016-04-20", "name": "线条1", "points": 139.05},{"date": "2016-04-21", "name": "线条1", "points": 142},{"date": "2016-04-22", "name": "线条1", "points": 135.761},{"date": "2016-04-25", "name": "线条1", "points": 136.174},{"date": "2016-04-26", "name": "线条1", "points": 134.782},{"date": "2016-04-27", "name": "线条1", "points": 128},{"date": "2016-04-28", "name": "线条1", "points": 121.5},{"date": "2016-04-29", "name": "线条1", "points": 120},{"date": "2016-05-02", "name": "线条1", "points": 123.966},{"date": "2016-05-03", "name": "线条1", "points": 122.538},{"date": "2016-05-04", "name": "线条1", "points": 120},{"date": "2016-05-05", "name": "线条1", "points": 120.21},{"date": "2016-05-06", "name": "线条1", "points": 121.01},{"date": "2016-05-09", "name": "线条1", "points": double.nan},{"date": "2016-05-10", "name": "线条1", "points": 120.622},{"date": "2016-05-11", "name": "线条1", "points": 123.85},{"date": "2016-05-12", "name": "线条1", "points": 122.963},{"date": "2016-05-13", "name": "线条1", "points": 126},{"date": "2016-05-17", "name": "线条1", "points": 130},{"date": "2016-05-18", "name": "线条1", "points": 128.845},{"date": "2016-05-19", "name": "线条1", "points": 130.17},{"date": "2016-05-20", "name": "线条1", "points": 129.741},{"date": "2016-05-23", "name": "线条1", "points": 129.668},{"date": "2016-05-24", "name": "线条1", "points": 126.886},{"date": "2016-05-25", "name": "线条1", "points": 128.239},{"date": "2016-05-26", "name": "线条1", "points": 127.239},{"date": "2016-05-27", "name": "线条1", "points": 127.457},{"date": "2016-05-30", "name": "线条1", "points": 127.37},{"date": "2016-05-31", "name": "线条1", "points": 130.756},{"date": "2016-06-01", "name": "线条1", "points": 133.232},{"date": "2016-06-02", "name": "线条1", "points": 126.47},{"date": "2016-06-03", "name": "线条1", "points": 126.385},{"date": "2016-06-06", "name": "线条1", "points": 128.331},{"date": "2016-06-07", "name": "线条1", "points": 130.914},{"date": "2016-06-08", "name": "线条1", "points": 133},{"date": "2016-06-09", "name": "线条1", "points": 133.041},{"date": "2016-06-10", "name": "线条1", "points": 133.041},{"date": "2016-06-13", "name": "线条1", "points": 129},{"date": "2016-06-14", "name": "线条1", "points": 129.166},{"date": "2016-06-15", "name": "线条1", "points": 124.687},{"date": "2016-06-16", "name": "线条1", "points": 122.77},{"date": "2016-06-17", "name": "线条1", "points": 126.461},{"date": "2016-06-20", "name": "线条1", "points": 127},{"date": "2016-06-21", "name": "线条1", "points": 125.594},{"date": "2016-06-22", "name": "线条1", "points": 127.438},{"date": "2016-06-23", "name": "线条1", "points": 124.44},{"date": "2016-06-24", "name": "线条1", "points": 122.131},{"date": "2016-06-27", "name": "线条1", "points": 120.53},{"date": "2016-06-28", "name": "线条1", "points": 120.296},{"date": "2016-06-29", "name": "线条1", "points": 125.877},{"date": "2016-06-30", "name": "线条1", "points": 126.404},{"date": "2016-01-04", "name": "线条2", "points": 130.914},{"date": "2016-01-05", "name": "线条2", "points": 133},{"date": "2016-01-06", "name": "线条2", "points": 159.704},{"date": "2016-01-07", "name": "线条2", "points": 133.19},{"date": "2016-01-08", "name": "线条2", "points": 202.157},{"date": "2016-01-11", "name": "线条2", "points": 128},{"date": "2016-01-12", "name": "线条2", "points": 138},{"date": "2016-01-13", "name": "线条2", "points": 152},{"date": "2016-01-14", "name": "线条2", "points": 157.76},{"date": "2016-01-15", "name": "线条2", "points": 134.397},{"date": "2016-01-18", "name": "线条2", "points": 170.373},{"date": "2016-01-19", "name": "线条2", "points": 140.547},{"date": "2016-01-20", "name": "线条2", "points": 133.733},{"date": "2016-01-21", "name": "线条2", "points": 124.098},{"date": "2016-01-22", "name": "线条2", "points": 113.833},{"date": "2016-01-25", "name": "线条2", "points": 125},{"date": "2016-01-26", "name": "线条2", "points": 154.866},{"date": "2016-01-27", "name": "线条2", "points": 130.264},{"date": "2016-01-28", "name": "线条2", "points": 142.296},{"date": "2016-01-29", "name": "线条2", "points": 114.502},{"date": "2016-02-01", "name": "线条2", "points": 137.936},{"date": "2016-02-02", "name": "线条2", "points": null},{"date": "2016-02-03", "name": "线条2", "points": 169.95},{"date": "2016-02-04", "name": "线条2", "points": 119.275},{"date": "2016-02-05", "name": "线条2", "points": 127.898},{"date": "2016-02-08", "name": "线条2", "points": 134.9},{"date": "2016-02-09", "name": "线条2", "points": 152.819},{"date": "2016-02-10", "name": "线条2", "points": 100.108},{"date": "2016-02-11", "name": "线条2", "points": 109.447},{"date": "2016-02-12", "name": "线条2", "points": 127.8},{"date": "2016-02-15", "name": "线条2", "points": null},{"date": "2016-02-22", "name": "线条2", "points": 120},{"date": "2016-02-23", "name": "线条2", "points": 149.948},{"date": "2016-02-24", "name": "线条2", "points": 102.5},{"date": "2016-03-03", "name": "线条2", "points": 142},{"date": "2016-03-04", "name": "线条2", "points": 165},{"date": "2016-03-07", "name": "线条2", "points": 173.905},{"date": "2016-03-08", "name": "线条2", "points": 128.155},{"date": "2016-02-25", "name": "线条2", "points": 118.08},{"date": "2016-04-04", "name": "线条2", "points": 149.467},{"date": "2016-04-05", "name": "线条2", "points": 130.695},{"date": "2016-04-06", "name": "线条2", "points": 128.725},{"date": "2016-04-07", "name": "线条2", "points": 137.539},{"date": "2016-04-08", "name": "线条2", "points": 135.8},{"date": "2016-04-11", "name": "线条2", "points": 138.5},{"date": "2016-04-12", "name": "线条2", "points": 124.465},{"date": "2016-04-13", "name": "线条2", "points": 143},{"date": "2016-04-14", "name": "线条2", "points": 134.35},{"date": "2016-04-15", "name": "线条2", "points": 127.2},{"date": "2016-04-18", "name": "线条2", "points": 112.611},{"date": "2016-04-19", "name": "线条2", "points": 135.479},{"date": "2016-02-26", "name": 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