Function categories

src/component/visualMap/PiecewiseModel.ts:494–507

(outPieceList)

    },

    categories(outPieceList) {
        const thisOption = this.option;
        zrUtil.each(thisOption.categories, function (cate) {
            // FIXME category模式也使用pieceList，但在visualMapping中不是使用pieceList。
            // 是否改一致。
            outPieceList.push({
                text: this.formatValueText(cate, true),
                value: cate
            });
        }, this);

        // See "Order Rule".
        normalizeReverse(thisOption, outPieceList);
    },

    pieces(outPieceList) {
        const thisOption = this.option;