function getSingleMarkerEndPoint()

in src/component/marker/MarkAreaView.ts [155:229]
66 lines of code
18 McCabe index (conditional complexity)

function getSingleMarkerEndPoint(
    data: SeriesData<MarkAreaModel>,
    idx: number,
    dims: typeof dimPermutations[number],
    seriesModel: SeriesModel,
    api: ExtensionAPI
) {
    const coordSys = seriesModel.coordinateSystem;
    const itemModel = data.getItemModel<MarkAreaMergedItemOption>(idx);

    let point;
    const xPx = numberUtil.parsePercent(itemModel.get(dims[0]), api.getWidth());
    const yPx = numberUtil.parsePercent(itemModel.get(dims[1]), api.getHeight());
    if (!isNaN(xPx) && !isNaN(yPx)) {
        point = [xPx, yPx];
    }
    else {
        // Chart like bar may have there own marker positioning logic
        if (seriesModel.getMarkerPosition) {
            // Consider the case that user input the right-bottom point first
            // Pick the larger x and y as 'x1' and 'y1'
            const pointValue0 = data.getValues(['x0', 'y0'], idx);
            const pointValue1 = data.getValues(['x1', 'y1'], idx);
            const clampPointValue0 = coordSys.clampData(pointValue0);
            const clampPointValue1 = coordSys.clampData(pointValue1);
            const pointValue = [];
            if (dims[0] === 'x0') {
                pointValue[0] = (clampPointValue0[0] > clampPointValue1[0]) ? pointValue1[0] : pointValue0[0];
            }
            else {
                pointValue[0] = (clampPointValue0[0] > clampPointValue1[0]) ? pointValue0[0] : pointValue1[0];
            }
            if (dims[1] === 'y0') {
                pointValue[1] = (clampPointValue0[1] > clampPointValue1[1]) ? pointValue1[1] : pointValue0[1];
            }
            else {
                pointValue[1] = (clampPointValue0[1] > clampPointValue1[1]) ? pointValue0[1] : pointValue1[1];
            }
            // Use the getMarkerPosition
            point = seriesModel.getMarkerPosition(
                pointValue, dims, true
            );
        }
        else {
            const x = data.get(dims[0], idx) as number;
            const y = data.get(dims[1], idx) as number;
            const pt = [x, y];
            coordSys.clampData && coordSys.clampData(pt, pt);
            point = coordSys.dataToPoint(pt, true);
        }
        if (isCoordinateSystemType<Cartesian2D>(coordSys, 'cartesian2d')) {
            // TODO: TYPE ts@4.1 may still infer it as Axis instead of Axis2D. Not sure if it's a bug
            const xAxis = coordSys.getAxis('x') as Axis2D;
            const yAxis = coordSys.getAxis('y') as Axis2D;
            const x = data.get(dims[0], idx) as number;
            const y = data.get(dims[1], idx) as number;
            if (isInfinity(x)) {
                point[0] = xAxis.toGlobalCoord(xAxis.getExtent()[dims[0] === 'x0' ? 0 : 1]);
            }
            else if (isInfinity(y)) {
                point[1] = yAxis.toGlobalCoord(yAxis.getExtent()[dims[1] === 'y0' ? 0 : 1]);
            }
        }

        // Use x, y if has any
        if (!isNaN(xPx)) {
            point[0] = xPx;
        }
        if (!isNaN(yPx)) {
            point[1] = yPx;
        }
    }

    return point;
}