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news 2025/8/5 20:36:09

云南网站设计选哪家,爱站网爱情电影网,电子商务网站开发技术和工具有哪些,最简单的网站开发工具renderer graphic中tooltip的TooltipGuide类提供了renderer方法，接收三个参数Size类型，Offset类型，Map<int, Tuple>类型。可查到的文档是真的少，所以只能在源码中扒拉例子，做符合需求的修改。官方github示例 …

renderer

在这里插入图片描述

graphic中tooltip的TooltipGuide类提供了renderer方法，接收三个参数Size类型，Offset类型，Map<int, Tuple>类型。可查到的文档是真的少，所以只能在源码中扒拉例子，做符合需求的修改。

官方github示例

官方示例

这个例子感觉像是tooltip和提供的那些属性的源码实现，然后改变了背景颜色等，但如果实现想echarts那样对每条线的数据前增加颜色块区分，还是要自己摸索。先看一下这个例子都做了什么吧

List<MarkElement> simpleTooltip(Size size,Offset anchor,Map<int, Tuple> selectedTuples,) {// 返回的元素列表List<MarkElement> elements;// 生成tooltip内容String textContent = '';// 选中的数据 ({date: xxx, name: 线条1, points: xxx}, {date: xx, name: 线条2, points: xx}...)final selectedTupleList = selectedTuples.values;// 选中的数据的字段名列表// 单条线：[date, points]// 多条线：会通过name区分不同线的数值[date, name, points]final fields = selectedTupleList.first.keys.toList();// 如果只有一条线if (selectedTuples.length == 1) {// 取出选中的数据final original = selectedTupleList.single;// 取出第一个字段的值var field = fields.first;// 将第一个字段的值放入到tooltip的第一行/*** 此时的数据结构是：* date: 2023-11-24*/textContent += '$field: ${original[field]}';// 遍历字段名列表for (var i = 1; i < fields.length; i++) {// 取出第i个字段field = fields[i];// 将第i个字段的值放入到tooltip的第二行/*** 遍历后的数据结构是：* date: 2023-11-24* points: 123*/textContent += '\n$field: ${original[field]}';}} else {// 如果有多条线// 遍历选中的数据（几条线几条数据），将每个数据的第二个字段和第三个字段的值放入到tooltip的第二行和第三行for (var original in selectedTupleList) {// 取出第一个字段final domainField = fields.first;// 取出最后一个字段final measureField = fields.last;/*** 遍历结束后的数据结构是：* 2023-11-24：线条1* 2023-11-24：线条2* ....*/textContent += '\n${original[domainField]}: ${original[measureField]}';}}// 提出一些变量const textStyle = TextStyle(fontSize: 12, color: Colors.white);const padding = EdgeInsets.all(5);const align = Alignment.topRight;const offset = Offset(5, -5);const elevation = 1.0;const backgroundColor = Colors.black;final painter = TextPainter(text: TextSpan(text: textContent, style: textStyle),textDirection: TextDirection.ltr,);painter.layout();// 计算tooltip的宽高final width = padding.left + painter.width + padding.right;final height = padding.top + painter.height + padding.bottom;// 调整tooltip弹框（包含内容）的位置final paintPoint = getBlockPaintPoint(anchor + offset,width,height,align,);// 调整tooltip弹框（不包含内容）的位置final window = Rect.fromLTWH(paintPoint.dx,paintPoint.dy,width,height,);// 计算tooltip文本的位置var textPaintPoint = paintPoint + padding.topLeft;elements = <MarkElement>[RectElement(rect: window,style: PaintStyle(fillColor: backgroundColor, elevation: elevation)),LabelElement(text: textContent,anchor: textPaintPoint,style:LabelStyle(textStyle: textStyle, align: Alignment.bottomRight)),];return elements;}

效果
在这里插入图片描述

根据需求调整

在这里插入图片描述

改动后代码

List<MarkElement> simpleTooltip(Size size,Offset anchor,Map<int, Tuple> selectedTuples,) {// 返回的元素列表List<MarkElement> elements;// 标识元素列表List<MarkElement> tagElements = [];// 生成tooltip内容String textContent = '';// 选中的数据 ({date: xxx, name: 线条1, points: xxx}, {date: xx, name: 线条2, points: xx}...)final selectedTupleList = selectedTuples.values;// 选中的数据的字段名列表 [date, name, points]final fields = selectedTupleList.first.keys.toList();// 选中的数据的第一个数据的第一个字段的值，放入到tooltip的第一行/*** 目前的数据结构是：* 2023-11-24*/textContent = '${selectedTupleList.first[fields.first]}';// 遍历选中的数据（几条线几条数据），将每个数据的第二个字段和第三个字段的值放入到tooltip的第二行和第三行for (var original in selectedTupleList) {final domainField = fields[1];final measureField = fields.last;/*** 遍历结束后的数据结构是：* 2023-11-24* 线条1: 123* 线条2: 456* ....*/textContent += '\n  ${original[domainField]}: ${original[measureField]}';}// 提出一些变量const textStyle = TextStyle(fontSize: 12, color: Colors.black, height: 2);const padding = EdgeInsets.all(5);const align = Alignment.topRight;const offset = Offset(5, -5);const elevation = 1.0;const backgroundColor = Colors.white;final painter = TextPainter(text: TextSpan(text: textContent, style: textStyle),textDirection: ui.TextDirection.ltr,);painter.layout();// tooltip的宽高final width = padding.left + painter.width + padding.right;final height = padding.top + painter.height + padding.bottom;// tooltip的位置// 大概根据中间的数据判断算了下位置,避免一直在左或右,边界超出屏幕final move = anchor < const Offset(250, 90)? anchor + offset - const Offset(-10, -40): anchor + Offset(-width - 20, 40);final paintPoint = getBlockPaintPoint(move,width,height,align,);final window = Rect.fromLTWH(paintPoint.dx - 10, //横向位置paintPoint.dy,width + 20,height,);var textPaintPoint = paintPoint + padding.topLeft;// 生成tooltip线条前的标识元素for (int i = 0; i < selectedTupleList.length; i++) {tagElements.add(LabelElement(text: '●',anchor: textPaintPoint + padding.topLeft + Offset(-15, 26 + i * 23),style: LabelStyle(textStyle: TextStyle(color: Defaults.colors10[i],fontWeight: FontWeight.w900,fontSize: 12),align: Alignment.bottomRight)),);}elements = <MarkElement>[RectElement(rect: window,style: PaintStyle(fillColor: backgroundColor, elevation: elevation)),...tagElements,LabelElement(text: textContent,anchor: textPaintPoint,style:LabelStyle(textStyle: textStyle, align: Alignment.bottomRight)),];return elements;}

效果
在这里插入图片描述

整体代码

// linePage.dart
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:graphic/graphic.dart';
import 'dart:ui' as ui;
import './components/static/data.dart';class linePage extends StatelessWidget {linePage({super.key});final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();List<MarkElement> simpleTooltip(Size size,Offset anchor,Map<int, Tuple> selectedTuples,) {// 返回的元素列表List<MarkElement> elements;// 标识元素列表List<MarkElement> tagElements = [];// 生成tooltip内容String textContent = '';// 选中的数据 ({date: xxx, name: 线条1, points: xxx}, {date: xx, name: 线条2, points: xx}...)final selectedTupleList = selectedTuples.values;// 选中的数据的字段名列表 [date, name, points]final fields = selectedTupleList.first.keys.toList();// 选中的数据的第一个数据的第一个字段的值，放入到tooltip的第一行/*** 目前的数据结构是：* 2023-11-24*/textContent = '${selectedTupleList.first[fields.first]}';// 遍历选中的数据（几条线几条数据），将每个数据的第二个字段和第三个字段的值放入到tooltip的第二行和第三行for (var original in selectedTupleList) {final domainField = fields[1];final measureField = fields.last;/*** 遍历结束后的数据结构是：* 2023-11-24* 线条1: 123* 线条2: 456* ....*/textContent += '\n  ${original[domainField]}: ${original[measureField]}';}// 提出一些变量const textStyle = TextStyle(fontSize: 12, color: Colors.black, height: 2);const padding = EdgeInsets.all(5);const align = Alignment.topRight;const offset = Offset(5, -5);const elevation = 1.0;const backgroundColor = Colors.white;final painter = TextPainter(text: TextSpan(text: textContent, style: textStyle),textDirection: ui.TextDirection.ltr,);painter.layout();// tooltip的宽高final width = padding.left + painter.width + padding.right;final height = padding.top + painter.height + padding.bottom;// tooltip的位置// 大概根据中间的数据判断算了下位置,避免一直在左或右,边界超出屏幕final move = anchor < const Offset(250, 90)? anchor + offset - const Offset(-10, -40): anchor + Offset(-width - 20, 40);final paintPoint = getBlockPaintPoint(move,width,height,align,);final window = Rect.fromLTWH(paintPoint.dx - 10, //横向位置paintPoint.dy,width + 20,height,);var textPaintPoint = paintPoint + padding.topLeft;// 生成tooltip线条前的标识元素for (int i = 0; i < selectedTupleList.length; i++) {tagElements.add(LabelElement(text: '●',anchor: textPaintPoint + padding.topLeft + Offset(-15, 26 + i * 23),style: LabelStyle(textStyle: TextStyle(color: Defaults.colors10[i],fontWeight: FontWeight.w900,fontSize: 12),align: Alignment.bottomRight)),);}elements = <MarkElement>[RectElement(rect: window,style: PaintStyle(fillColor: backgroundColor, elevation: elevation)),...tagElements,LabelElement(text: textContent,anchor: textPaintPoint,style:LabelStyle(textStyle: textStyle, align: Alignment.bottomRight)),];return elements;}@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',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),),'name': Variable(accessor: (Map map) => map['name'] as String,),'points': Variable(accessor: (Map map) => (map['points'] ?? double.nan) as num,),},marks: [// 线条LineMark(// 如果单线条加name则必须有position属性配置，否则是一条直线position:Varset('date') * Varset('points') / Varset('name'),shape: ShapeEncode(value: BasicLineShape(smooth: true),),// 粗细size: SizeEncode(value: 1.5),),// 线条与X轴之间区域填充AreaMark(// 如果单线条加name则必须有position属性配置，否则不显示position:Varset('date') * Varset('points') / Varset('name'),shape: ShapeEncode(value:BasicAreaShape(smooth: true), // smooth: true 使线条变得平滑),color: ColorEncode(value: Colors.pink.withAlpha(80),),),],// 坐标轴配置axes: [Defaults.horizontalAxis,Defaults.verticalAxis,],selections: {'touchMove': PointSelection(on: {GestureType.scaleUpdate,GestureType.tapDown,GestureType.hover,GestureType.longPressMoveUpdate},dim: Dim.x,)},// 触摸弹框提示tooltip: TooltipGuide(// 跟随鼠标位置// followPointer: [false, true],// align: Alignment.topLeft, // 弹框对于点击位置的对齐方式// offset: const Offset(-20, -20), // 偏移量// 使用自定义需要注释上面的一些配置renderer: simpleTooltip,),// 十字准线crosshair: CrosshairGuide(followPointer: [false, true]),),),Container(padding: const EdgeInsets.fromLTRB(20, 40, 20, 5),child: const Text('Group interactions',style: TextStyle(fontSize: 20),),),Container(margin: const EdgeInsets.only(top: 10),width: 350,height: 300,child: Chart(data: invalidData1,variables: {'date': Variable(accessor: (Map map) => map['date'] as String,scale: OrdinalScale(tickCount: 5, inflate: true),),'name': Variable(accessor: (Map map) => map['name'] as String,),'points': Variable(accessor: (Map map) => (map['points'] ?? double.nan) as num,),},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,// updaters: {//   'groupMouse': {false: (color) => color.withAlpha(100)},//   // 'groupTouch': {false: (color) => color.withAlpha(100)},// },),),// 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devices: {PointerDeviceKind.mouse},variable: 'date',),'groupMouse': PointSelection(on: {GestureType.hover,},// variable: 'name',devices: {PointerDeviceKind.mouse},),'tooltipTouch': PointSelection(on: {GestureType.scaleUpdate,GestureType.tapDown,GestureType.longPressMoveUpdate},// variable: 'name',devices: {PointerDeviceKind.touch},),},tooltip: TooltipGuide(selections: {'tooltipTouch', '666'},// multiTuples: true,// followPointer: [false, true],// align: Alignment.topLeft,// // mark: 0,// // 与上方selections中定义的variable相排斥// variables: [//   // 'date',//   'name',//   'points',// ],renderer: simpleTooltip),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],),),),],),),);}
}


// 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": 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"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": 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