Function interpolateRawValues

src/util/model.ts:1095–1154

(
    data: SeriesData,
    precision: number | 'auto',
    sourceValue: InterpolatableValue,
    targetValue: InterpolatableValue,
    percent: number
)

 *                     Other cases do not supported.
 */
export function interpolateRawValues(
    data: SeriesData,
    precision: number | 'auto',
    sourceValue: InterpolatableValue,
    targetValue: InterpolatableValue,
    percent: number
): InterpolatableValue {
    const isAutoPrecision = precision == null || precision === 'auto';

    if (targetValue == null) {
        return targetValue;
    }

    if (isNumber(targetValue)) {
        const value = interpolateNumber(
            sourceValue as number || 0,
            targetValue as number,
            percent
        );
        return round(
            value,
            isAutoPrecision ? Math.max(
                getPrecision(sourceValue as number || 0),
                getPrecision(targetValue as number)
            )
            : precision as number
        );
    }
    else if (isString(targetValue)) {
        return percent < 1 ? sourceValue : targetValue;
    }
    else {
        const interpolated = [];
        const leftArr = sourceValue as (string | number)[];
        const rightArr = targetValue as (string | number[]);
        const length = Math.max(leftArr ? leftArr.length : 0, rightArr.length);
        for (let i = 0; i < length; ++i) {
            const info = data.getDimensionInfo(i);
            // Don't interpolate ordinal dims
            if (info && info.type === 'ordinal') {
                // In init, there is no `sourceValue`, but should better not to get undefined result.
                interpolated[i] = (percent < 1 && leftArr ? leftArr : rightArr)[i] as number;
            }
            else {
                const leftVal = leftArr && leftArr[i] ? leftArr[i] as number : 0;
                const rightVal = rightArr[i] as number;
                const value = interpolateNumber(leftVal, rightVal, percent);
                interpolated[i] = round(
                    value,
                    isAutoPrecision ? Math.max(
                        getPrecision(leftVal),
                        getPrecision(rightVal)
                    )
                    : precision as number
                );
            }
        }
        return interpolated;