Function calculateBase

src/chart/boxplot/boxplotLayout.ts:76–114

* Calculate offset and box width for each series.

(baseAxis: Axis, seriesCount: number)

 * Calculate offset and box width for each series.
 */
function calculateBase(baseAxis: Axis, seriesCount: number): BaseCalculationResult {
    const boxWidthList: BaseCalculationResult['boxOffsetList'] = [];
    const boxOffsetList: BaseCalculationResult['boxWidthList'] = [];
    const boundList: Record<BoxplotSeriesModel['seriesIndex'], number[]> = [];

    const bandWidth = calcBandWidth(
        baseAxis,
        {fromStat: {key: makeAxisStatKey(SERIES_TYPE_BOXPLOT)}, min: 1},
    ).w;

    eachSeriesOnAxisOnKey(baseAxis, makeAxisStatKey(SERIES_TYPE_BOXPLOT), function (seriesModel: BoxplotSeriesModel) {
        let boxWidthBound = seriesModel.get('boxWidth');
        if (!isArray(boxWidthBound)) {
            boxWidthBound = [boxWidthBound, boxWidthBound];
        }
        boundList[seriesModel.seriesIndex] = [
            parsePercent(boxWidthBound[0], bandWidth) || 0,
            parsePercent(boxWidthBound[1], bandWidth) || 0
        ];
    });

    const availableWidth = bandWidth * 0.8 - 2;
    const boxGap = availableWidth / seriesCount * 0.3;
    const boxWidth = (availableWidth - boxGap * (seriesCount - 1)) / seriesCount;
    let base = boxWidth / 2 - availableWidth / 2;

    eachSeriesOnAxisOnKey(baseAxis, makeAxisStatKey(SERIES_TYPE_BOXPLOT), function (seriesModel) {
        const seriesIndex = seriesModel.seriesIndex;
        boxOffsetList[seriesIndex] = base;
        base += boxGap + boxWidth;

        boxWidthList[seriesIndex] = mathMin(mathMax(boxWidth, boundList[seriesIndex][0]), boundList[seriesIndex][1]);
    });

    return {
        boxOffsetList,
        boxWidthList,
    };
}

/**
 * Calculate points location for each series.