Function initLinearScaleMapper

src/scale/scaleMapper.ts:401–417

(
    // If input `null/undefined`, a mapper will be created.
    mapper: ScaleMapper | NullUndefined,
    initialExtent: number[] | NullUndefined
)

}

export function initLinearScaleMapper(
    // If input `null/undefined`, a mapper will be created.
    mapper: ScaleMapper | NullUndefined,
    initialExtent: number[] | NullUndefined
): ScaleMapper {
    const linearMapper = (mapper || {}) as LinearScaleMapper;

    const extendList: number[][] = [];
    // @ts-ignore
    linearMapper._extents = extendList;

    extendList[SCALE_EXTENT_KIND_EFFECTIVE] = initialExtent ? initialExtent.slice() : initExtentForUnion();

    extend(linearMapper, linearScaleMapperMethods);

    return linearMapper;
}

const linearScaleMapperMethods: ScaleMapperGeneric<LinearScaleMapper> = {