echarts 柱形图自动循环滚动
转载
https://blog.csdn.net/qq_34720531/article/details/120880230
<!--
THIS EXAMPLE WAS DOWNLOADED FROM https://echarts.apache.org/examples/zh/editor.html?c=bar-gradient
-->
<!DOCTYPE html>
<html style="height: 100%">
<head>
<meta charset="utf-8">
</head>
<body style="height: 100%; margin: 0">
<div id="container" style="height: 100%"></div>
<!-- 新版echarts -->
<script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/echarts/echarts.min.js"></script>
<script type="text/javascript">
var dom = document.getElementById("container");
var myChart = echarts.init(dom);
var app = {};
var option;
// prettier-ignore
let dataAxis = ['点', '击', '柱', '子', '或', '者', '两', '指', '在', '触', '屏', '上', '滑', '动', '能', '够', '自', '动', '缩', '放'];
// prettier-ignore
let data = [220, 182, 191, 234, 290, 330, 310, 123, 442, 321, 90, 149, 210, 122, 133, 334, 198, 123, 125, 220];
let yMax = 500;
let dataShadow = [];
for (let i = 0; i < data.length; i++) {
dataShadow.push(yMax);
}
option = {
title: {
text: '特性示例：渐变色 阴影 点击缩放',
subtext: 'Feature Sample: Gradient Color, Shadow, Click Zoom'
},
xAxis: {
data: dataAxis,
axisLabel: {
inside: true,
interval: 0,
// 文字竖排
formatter: function(value) {
return value.split('').join('\n')
},
color: '#fff'
},
axisTick: {
show: false
},
axisLine: {
show: false
},
z: 10
},
yAxis: {
axisLine: {
show: false
},
axisTick: {
show: false
},
axisLabel: {
color: '#999'
}
},
dataZoom: [
{
xAxisIndex: 0,// 这里是从X轴的0刻度开始
show: false, // 是否显示滑动条，不影响使用
type: "slider", // 这个 dataZoom 组件是 slider 型 dataZoom 组件
startValue: 0, // 从头开始。
endValue: 10, // 一次性展示多少个。
},
],
series: [
{
type: 'bar',
showBackground: true,
itemStyle: {
color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
{ offset: 0, color: '#83bff6' },
{ offset: 0.5, color: '#188df0' },
{ offset: 1, color: '#188df0' }
])
},
emphasis: {
itemStyle: {
color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
{ offset: 0, color: '#2378f7' },
{ offset: 0.7, color: '#2378f7' },
{ offset: 1, color: '#83bff6' }
])
}
},
data: data
}
]
};
// 双击放大，或滚动放大缩小
// const zoomSize = 6;
// myChart.on('click', function (params) {
// console.log(dataAxis[Math.max(params.dataIndex - zoomSize / 2, 0)]);
// myChart.dispatchAction({
// type: 'dataZoom',
// startValue: dataAxis[Math.max(params.dataIndex - zoomSize / 2, 0)],
// endValue: dataAxis[Math.min(params.dataIndex + zoomSize / 2, data.length - 1)]
// });
// });
if (option && typeof option === 'object') {
myChart.setOption(option);
// 定时自动滚动
setInterval(function(){
if (option.dataZoom[0].endValue == data.length ) {
option.dataZoom[0].endValue = 10;
option.dataZoom[0].startValue = 0;
} else {
option.dataZoom[0].endValue = option.dataZoom[0].endValue + 1;
option.dataZoom[0].startValue = option.dataZoom[0].startValue + 1;
}
myChart.setOption(option);
}, 2000)
}
</script>
</body>
</html>