Function processOnAxis

src/component/axisPointer/axisTrigger.ts:213–257

(
    axisInfo: CollectedCoordInfo['axesInfo'][string],
    newValue: AxisValue,
    updaters: {
        showPointer: Curry1<typeof showPointer, ShowValueMap>
        showTooltip: Curry1<typeof showTooltip, DataByCoordSysCollection>
    },
    noSnap: boolean,
    outputFinder: ModelFinderObject
)

}

function processOnAxis(
    axisInfo: CollectedCoordInfo['axesInfo'][string],
    newValue: AxisValue,
    updaters: {
        showPointer: Curry1<typeof showPointer, ShowValueMap>
        showTooltip: Curry1<typeof showTooltip, DataByCoordSysCollection>
    },
    noSnap: boolean,
    outputFinder: ModelFinderObject
) {
    const axis = axisInfo.axis;

    if (axis.scale.isBlank() || !axis.containData(newValue)) {
        return;
    }

    if (!axisInfo.involveSeries) {
        updaters.showPointer(axisInfo, newValue);
        return;
    }

    // Heavy calculation. So put it after axis.containData checking.
    const payloadInfo = buildPayloadsBySeries(newValue, axisInfo);
    const payloadBatch = payloadInfo.payloadBatch;
    const snapToValue = payloadInfo.snapToValue;

    // Fill content of event obj for echarts.connect.
    // By default use the first involved series data as a sample to connect.
    if (payloadBatch[0] && outputFinder.seriesIndex == null) {
        extend(outputFinder, payloadBatch[0]);
    }

    // If no linkSource input, this process is for collecting link
    // target, where snap should not be accepted.
    if (!noSnap && axisInfo.snap) {
        if (axis.containData(snapToValue) && snapToValue != null) {
            newValue = snapToValue;
        }
    }

    updaters.showPointer(axisInfo, newValue, payloadBatch);
    // Tooltip should always be snapToValue, otherwise there will be
    // incorrect "axis value ~ series value" mapping displayed in tooltip.
    updaters.showTooltip(axisInfo, payloadInfo, snapToValue);
}

function buildPayloadsBySeries(value: AxisValue, axisInfo: CollectedAxisInfo) {
    const axis = axisInfo.axis;