Function dataStatistics

src/chart/map/mapDataStatistic.ts:28–68

(datas: SeriesData[], statisticType: MapValueCalculationType)

// FIXME 公用？
function dataStatistics(datas: SeriesData[], statisticType: MapValueCalculationType): SeriesData {
    const dataNameMap = {} as {[mapKey: string]: number[]};

    zrUtil.each(datas, function (data) {
        data.each(data.mapDimension('value'), function (value: number, idx) {
            // Add prefix to avoid conflict with Object.prototype.
            const mapKey = 'ec-' + data.getName(idx);
            dataNameMap[mapKey] = dataNameMap[mapKey] || [];
            if (!isNaN(value)) {
                dataNameMap[mapKey].push(value);
            }
        });
    });

    return datas[0].map(datas[0].mapDimension('value'), function (value, idx) {
        const mapKey = 'ec-' + datas[0].getName(idx);
        let sum = 0;
        let min = Infinity;
        let max = -Infinity;
        const len = dataNameMap[mapKey].length;
        for (let i = 0; i < len; i++) {
            min = Math.min(min, dataNameMap[mapKey][i]);
            max = Math.max(max, dataNameMap[mapKey][i]);
            sum += dataNameMap[mapKey][i];
        }
        let result;
        if (statisticType === 'min') {
            result = min;
        }
        else if (statisticType === 'max') {
            result = max;
        }
        else if (statisticType === 'average') {
            result = sum / len;
        }
        else {
            result = sum;
        }
        return len === 0 ? NaN : result;
    });
}

export const mapDataStatisticStageHandler = createSimpleOverallStageHandler(SERIES_TYPE_MAP, mapDataStatistic);