echarts的markline警标线(一条/多条)的使用
·
echarts之markLine(可以设置特定阈值线
(警戒线
))
一条线写法
series: [
{
name: 'Fake Data',
type: 'line',
showSymbol: false,
data: data,
markLine: {
symbol: ['none', 'none'], // 去掉箭头
label: {
show: false,
position: 'start',
formatter: '{b}'
},
data: [
{
name: '阈值',
yAxis: 200
}
],
lineStyle: {
type:'solid',
color: '#FF1D00',
width: 1
}
}
}
}
]
二、多条不同颜色markLine
markLine: {
symbol: 'none',
label: {
show: false,
position: 'start',
formatter: '{b}'
},
lineStyle:{
type:'solid',
color: '#FF1D00',
width: 1
},
data: [
{yAxis: '40',lineStyle: {color: '#FF1D00'},label: {color: '#FF1D00',,fontSize:10}},
{yAxis: '25',lineStyle: {color: '#FF7804'},label: {color: '#FF7804',fontSize:10}}]
},
需求
要在echart图表中加两条最大值(红色)
及最小值线(绿色)
,
res的数据格式
方案一:
是将最大值/最小值数据
放到一个数组中,组成一条线,放到Echart图中
data(){
return{
maxHumidityData: [],
minHumidityData: [],
humSeriesData:[]
}
}
generterChartData(res) {
const chartData = res.humitureList.content
chartData.map((r) => {
// 湿度最大值 最小值
let humMaxItem = []
let humMaxObj = {}
humMaxItem.push(r.createDate, res.maxTemperature)
humMaxObj.name = r.createDate
humMaxObj.value = humMaxItem
this.maxHumidityData.push(humMaxObj)
// 最小值折线数据
let humMinItem = []
let hunMinObj = {}
humMinItem.push(r.createDate, res.minTemperature)
hunMinObj.name = r.createDate
hunMinObj.value = humMinItem
this.minHumidityData.push(hunMinObj)
)}
let maxHumSeries = {
name: '',
type: "line",
data: this.maxHumidityData,
showSymbol: false,
itemStyle: {
normal: { lineStyle: { color: '#ff0000' } },
},
};
// 湿度最小值
let minHumSeries = {
name: '',
type: "line",
data: this.minHumidityData,
showSymbol: false,
itemStyle: {
normal: { lineStyle: { color: '#008000' } },
},
};
}
方案二:
使用eharts自带的 markline警标线
(推荐该方法,简洁明了,节省代码)
series: [
{
name: '湿度曲线',
type: 'line',
showSymbol: false,
data: this.humSeriesData,
markLine: {
symbol: ['none', 'none'], // 去掉箭头
label: {
show: false,
position: 'start',
formatter: '{b}'
},
lineStyle: {
type: 'solid',
width: 2
},
data: [
{
yAxis: res.minTemperature,
lineStyle: { color: '#008000' },
label: { color: '#008000' }
},
{
yAxis: res.maxTemperature,
lineStyle: { color: '#ff0000' },
label: { color: '#ff0000' }
}
]
},
]
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