Function formatLabel

src/component/dataZoom/SliderZoomView.ts:1130–1161

(
    dataZoomModel: SliderZoomModel,
    extentIdx: 0 | 1,
    window: AxisProxyWindow,
    scale: Scale
)

}

function formatLabel(
    dataZoomModel: SliderZoomModel,
    extentIdx: 0 | 1,
    window: AxisProxyWindow,
    scale: Scale
): string {
    const labelFormatter = dataZoomModel.get('labelFormatter');

    let labelPrecision = dataZoomModel.get('labelPrecision');
    if (labelPrecision == null || labelPrecision === 'auto') {
        labelPrecision = window.valuePrecision;
    }

    // Do not display values out of `SCALE_EXTENT_KIND_EFFECTIVE` - generally they are meaningless.
    // For example, `scaleExtent[0]` is often `0`, and negative values are unlikely to be meaningful.
    // That is, "nice" expansion and `SCALE_EXTENT_KIND_MAPPING` expansion are always not display in labels.
    const value = window.value[extentIdx];

    const valueStr = (value == null || isNaN(value))
        ? ''
        : (isOrdinalScale(scale) || isTimeScale(scale))
        ? scale.getLabel({value: Math.round(value)})
        : isFinite(labelPrecision)
        ? round(value, labelPrecision, true)
        : value + '';

    return isFunction(labelFormatter)
        ? labelFormatter(value, valueStr)
        : isString(labelFormatter)
            ? labelFormatter.replace('{value}', valueStr)
            : valueStr;
}

function getOtherDim(thisDim: 'x' | 'y' | 'radius' | 'angle' | 'single' | 'z') {
    // FIXME