Function markAreaTransform

src/component/marker/MarkAreaView.ts:64–100

(
    seriesModel: SeriesModel,
    coordSys: CoordinateSystem,
    maModel: MarkAreaModel,
    item: MarkArea2DDataItemOption
)

};

const markAreaTransform = function (
    seriesModel: SeriesModel,
    coordSys: CoordinateSystem,
    maModel: MarkAreaModel,
    item: MarkArea2DDataItemOption
): MarkAreaMergedItemOption {
    // item may be null
    const item0 = item[0];
    const item1 = item[1];
    if (!item0 || !item1) {
        return;
    }

    const lt = markerHelper.dataTransform(seriesModel, item0);
    const rb = markerHelper.dataTransform(seriesModel, item1);

    // FIXME make sure lt is less than rb
    const ltCoord = lt.coord;
    const rbCoord = rb.coord;
    ltCoord[0] = retrieve(ltCoord[0], -Infinity);
    ltCoord[1] = retrieve(ltCoord[1], -Infinity);

    rbCoord[0] = retrieve(rbCoord[0], Infinity);
    rbCoord[1] = retrieve(rbCoord[1], Infinity);

    // Merge option into one
    const result: MarkAreaMergedItemOption = mergeAll([{}, lt, rb]);

    result.coord = [
        lt.coord, rb.coord
    ];
    result.x0 = lt.x;
    result.y0 = lt.y;
    result.x1 = rb.x;
    result.y1 = rb.y;
    return result;
};

function isInfinity(val: ScaleDataValue) {
    return !isNaN(val as number) && !isFinite(val as number);