apache / echarts

Apache ECharts is a powerful, interactive charting and data visualization library for browser
https://echarts.apache.org
Apache License 2.0
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[Bug] 高频率更新echarts中的数据时,无法使用brush来框选 #20377

Open shukeLiang opened 1 month ago

shukeLiang commented 1 month ago

Version

5.4.3

Link to Minimal Reproduction

https://echarts.apache.org/examples/zh/editor.html?c=area-time-axis

Steps to Reproduce

将以下js代码直接复制到上面那个示例的js文件中,然后进行datazoom刷选动作即可复现 var dom = document.getElementById('chart-container'); var myChart = echarts.init(dom, null, { renderer: 'canvas', useDirtyRect: false }); var app = {};

var option;

let base = +new Date(1988, 9, 3); let oneDay = 24 3600 1000; let data = [[base, Math.random() 300]]; for (let i = 1; i < 20000; i++) { let now = new Date((base += oneDay)); data.push([+now, Math.round((Math.random() - 0.5) 20 + data[i - 1][1])]); } setInterval(() => { data[data.length - 1][1] = Math.round((Math.random() - 0.5) * 20 + data[19999][1]); option = { tooltip: { trigger: 'axis', position: function (pt) { return [pt[0], '10%']; } }, title: { left: 'center', text: 'Large Ara Chart' }, toolbox: { feature: { dataZoom: { yAxisIndex: 'none' }, restore: {}, saveAsImage: {} } }, xAxis: { type: 'time', boundaryGap: false }, yAxis: { type: 'value', boundaryGap: [0, '100%'] }, dataZoom: [ { type: 'inside', }, { start: 0, end: 20 } ], series: [ { name: 'Fake Data', type: 'line', smooth: true, symbol: 'none', areaStyle: {}, data: data } ] };

if (option && typeof option === 'object') { myChart.setOption(option); } }, 200)

window.addEventListener('resize', myChart.resize);

Current Behavior

数据快速刷新, 无法进行刷选放大

Expected Behavior

数据快速刷新, 能够正常刷选放大

Environment

- OS:
- Browser:
- Framework:

Any additional comments?

跟之前这个是同一个问题,请帮忙看看 https://github.com/apache/echarts/issues/10859

helgasoft commented 1 month ago

Data refreshes quickly, and zooming in and out is not possible

It is possible to brush zoom in and out - Demo.
Clicking the brush-zoom toolbar button however is challenging due to the fast refresh. What is not possible is to see the newly arriving data in the zoomed window. Brushed zoom window shows just a snapshot of the data, yet new data keeps coming on the right side. Also wondering - what would justify taking zoom snapshots of fast moving data (!?)

shukeLiang commented 1 month ago

Data refreshes quickly, and zooming in and out is not possible

It is possible to brush zoom in and out - Demo. Clicking the brush-zoom toolbar button however is challenging due to the fast refresh. What is not possible is to see the newly arriving data in the zoomed window. Brushed zoom window shows just a snapshot of the data, yet new data keeps coming on the right side. Also wondering - what would justify taking zoom snapshots of fast moving data (!?)

Because our application scenario is to display real-time data, new data is constantly refreshed and added to the canvas, but we need to partially zoom in and analyze the data of the past few minutes ago.