Function getValueStart

src/chart/line/helper.ts:83–112

(valueAxis: Axis, valueOrigin: LineSeriesOption['areaStyle']['origin'])

}

function getValueStart(valueAxis: Axis, valueOrigin: LineSeriesOption['areaStyle']['origin']) {
    let valueStart = 0;
    const extent = valueAxis.scale.getExtent();

    if (valueOrigin === 'start') {
        valueStart = extent[0];
    }
    else if (valueOrigin === 'end') {
        valueStart = extent[1];
    }
    // If origin is specified as a number, use it as
    // valueStart directly
    else if (isNumber(valueOrigin) && !isNaN(valueOrigin)) {
        valueStart = valueOrigin;
    }
    // auto
    else {
        // Both positive
        if (extent[0] > 0) {
            valueStart = extent[0];
        }
        // Both negative
        else if (extent[1] < 0) {
            valueStart = extent[1];
        }
        // If is one positive, and one negative, onZero shall be true
    }

    return valueStart;
}

export function getStackedOnPoint(
    dataCoordInfo: CoordInfo,