基于Echart实现折线图的绘制详解
作者：Ciao_Traveler
EChart开源来自百度商业前端数据可视化团队，基于html5 Canvas，是一个纯Javascript图表库，提供直观，生动，可交互，可个性化定制的数据可视化图表。本文将利用EChart实现折线图的绘制，感兴趣的可以学习一下
效果图
不显示折线图上的拐点方法 ，3个都可以使用，代码中有显示在什么位置使用。
symbolSize:0,
symbol:“none”,
showSymbol:false,
代码：
var mess = ["00:00", "03：00", "06:00", "09:00", "12:00", "15:00", "18:00", "21:00", "24:00"];
var mess3 = preData;
var mess4 = curData;
var option = {
legend: {
show: true,
itemWidth: 20,
itemHeight: 10,
itemGap: 10,
textStyle: {
fontSize: 10,
color: "#ccc",
},
},
tooltip: {
trigger: "axis",
axisPointer: {
lineStyle: {
color: {
type: "linear",
x: 0,
y: 0,
x2: 0,
y2: 1,
colorStops: [
{
offset: 0,
color: "rgba(0, 255, 233,0)",
},
{
offset: 0.5,
color: "rgba(255, 255, 255,1)",
},
{
offset: 1,
color: "rgba(0, 255, 233,0)",
},
],
global: false,
},
},
},
},
grid: {
top: "25%",
left: "10%",
right: "5%",
bottom: "25%",
},
xAxis: {
data: mess,
axisTick: {
show: false,//是否显示坐标轴刻度。
},
boundaryGap: false,//x轴留白，默认是true，这时候刻度只是作为分隔线，标签和数据点都会在两个刻度之间的带(band)中间
axisLine: {
show: true,
lineStyle: {
color: "#414965",
},
},
axisLabel: {
interval: 1,
textStyle: {
color: "#7089ba",
fontSize: 12,
},
margin: 10, //刻度标签与轴线之间的距离。
},
},
yAxis: {
name:unit,
nameTextStyle: {
color: "#fff",
},
splitLine: { //是否显示分隔线
show: true,
lineStyle: {
color: "#414965",
opacity: 0.3,
},
},
axisTick: {
show: false,
},
axisLine: {
show: false,
},
axisLabel: {
textStyle: {
color: "#7089ba",
fontSize: 12,
},
},
splitNumber: 3//坐标轴的分割段数
},
series: [
{
name: "今日",
type: "line",
smooth: true, //是否平滑
showAllSymbol: false,//不显示折线图的拐点
symbol: "circle",
symbolSize: 2,
lineStyle: {
normal: {
color: "#44b6fe",
},
},
itemStyle: {
color: "#44b6fe",
},
tooltip: {
show: true,
},
areaStyle: {
normal: {
color: new echarts.graphic.LinearGradient(0, 0, 0, 1,
[
{
offset: 0,
color: "rgba(53,194,246,0.7)",
},
{
offset: 1,
color: "rgba(53,194,246,0.1)",
},
],
false
),
shadowBlur: 20,
},
},
data: mess4,
markPoint: {
symbolSize: 30,
data: [
{ type: "max", name: "最大值" },
{ type: "min", name: "最小值" },
],
},
},
{
name: "昨日",
type: "line",
smooth: true, //是否平滑
showAllSymbol: false,
symbol: "circle",
symbolSize: 2,
lineStyle: {
normal: {
color: "#ad16ff",
},
},
itemStyle: {
color: "#ad16ff",
},
tooltip: {
show: true,
},
areaStyle: {
normal: {
color: new echarts.graphic.LinearGradient(0, 0, 0, 1,
[
{
offset: 0,
color: "rgba(179,64,242,0.7)",
},
{
offset: 1,
color: "rgba(179,64,242,0.1)",
},
],
false
),
shadowColor: "rgba(179,64,242, 0)",
shadowBlur: 20,
},
},
data: mess3,
markPoint: {
symbolSize: 30,
data: [
{ type: "max", name: "最大值" },
{ type: "min", name: "最小值" },
],
},
},
],
};
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