Function markLineTransform

src/component/marker/MarkLineView.ts:66–155

(
    seriesModel: SeriesModel,
    coordSys: CoordinateSystem,
    mlModel: MarkLineModel,
    item: MarkLineOption['data'][number]
)

}, MarkLineModel>();

const markLineTransform = function (
    seriesModel: SeriesModel,
    coordSys: CoordinateSystem,
    mlModel: MarkLineModel,
    item: MarkLineOption['data'][number]
) {
    const data = seriesModel.getData();

    let itemArray: MarkLineMergedItemOption[];
    if (!isArray(item)) {
        // Special type markLine like 'min', 'max', 'average', 'median'
        const mlType = item.type;
        if (
            mlType === 'min' || mlType === 'max' || mlType === 'average' || mlType === 'median'
            // In case
            // data: [{
            //   yAxis: 10
            // }]
            || (item.xAxis != null || item.yAxis != null)
        ) {

            let valueAxis;
            let value;

            if (item.yAxis != null || item.xAxis != null) {
                valueAxis = coordSys.getAxis(item.yAxis != null ? 'y' : 'x');
                value = retrieve(item.yAxis, item.xAxis);
            }
            else {
                const axisInfo = markerHelper.getAxisInfo(item, data, coordSys, seriesModel);
                valueAxis = axisInfo.valueAxis;
                const valueDataDim = getStackedDimension(data, axisInfo.valueDataDim);
                value = markerHelper.numCalculate(data, valueDataDim, mlType);
            }
            const valueIndex = valueAxis.dim === 'x' ? 0 : 1;
            const baseIndex = 1 - valueIndex;

            // Normized to 2d data with start and end point
            const mlFrom = clone(item) as MarkLine2DDataItemOption[number];
            const mlTo = {
                coord: []
            } as MarkLine2DDataItemOption[number];

            mlFrom.type = null;

            mlFrom.coord = [];
            mlFrom.coord[baseIndex] = -Infinity;
            mlTo.coord[baseIndex] = Infinity;

            const precision = mlModel.get('precision');
            if (precision >= 0 && isNumber(value)) {
                value = +value.toFixed(Math.min(precision, 20));
            }

            mlFrom.coord[valueIndex] = mlTo.coord[valueIndex] = value;

            itemArray = [mlFrom, mlTo, { // Extra option for tooltip and label
                type: mlType,