[Feature] crosshair can update when chart updated by datazoom

[xile611]

What problem does this feature solve?

const response = await fetch('https://lf9-dp-fe-cms-tos.byteorg.com/obj/bit-cloud/stocks.json');
const data = await response.json();
const spec = {
  color: ['#1ac7c2', '#6f40aa', '#ccf59a', '#D4ADFC'],
  type: 'bar',
  dataId: 'bar',
  xField: 'Date',
  yField: 'Close',
  seriesField: 'Symbol',
  dataZoom: [
    {
      orient: 'bottom',
      backgroundChart: {
        area: {
          style: {
            lineWidth: 1,
            fill: '#D1DBEE'
          }
        },
        line: {
          style: {
            stroke: '#D1DBEE',
            lineWidth: 1
          }
        }
      },
      selectedBackgroundChart: {
        area: {
          style: {
            lineWidth: 1,
            fill: '#fbb934'
          }
        },
        line: {
          style: {
            stroke: '#fbb934',
            lineWidth: 1
          }
        }
      }
    }
  ],
  legends: {
    visible: true,
    orient: 'top'
  },
  title: {
    text: 'This line chart shows the weekly price of several technology stocks in from 2016 to 2018 relative to each stock’s price on the highlighted date.',
    textStyle: {
      height: 50,
      lineWidth: 3,
      fill: '#333',
      fontSize: 25,
      fontFamily: 'Times New Roman'
    }
  },
  data: [
    {
      id: 'bar',
      values: data
    }
  ],
  crosshair: {
    trigger: []
  }
};

const vchart = new VChart(spec, { dom: CONTAINER_ID, animation: false });
vchart.renderSync();

vchart.setDimensionIndex('2018-02-07', { tooltip: false })

// 只为了方便控制台调试用，不要拷贝
window['vchart'] = vchart;

当 crosshair 常显的时候，crosshair 能够动态更新位置

What does the proposed API look like?

暂无