Method constructor

src/scale/Ordinal.ts:129–158

(setting: OrdinalScaleSetting)

    constructor(setting: OrdinalScaleSetting) {
        super();

        this.parse = OrdinalScale.parse;

        decorateScaleMapper(this, OrdinalScale.decoratedMethods);

        let ordinalMeta = setting.ordinalMeta;
        // Caution: Should not use instanceof, consider ec-extensions using
        // import approach to get OrdinalMeta class.
        if (!ordinalMeta) {
            ordinalMeta = new OrdinalMeta({});
        }
        if (isArray(ordinalMeta)) {
            ordinalMeta = new OrdinalMeta({
                categories: map(ordinalMeta, item => (isObject(item) ? item.value : item))
            });
        }
        this._ordinalMeta = ordinalMeta as OrdinalMeta;

        // Create an interval LinearScaleMapper, and decorate it.
        const res = initBreakOrLinearMapper(
            null,
            null, // Do not support break in OrdinalScale yet.
            setting.extent || [0, ordinalMeta.categories.length - 1]
        );
        this._mapper = res.mapper;

        enableScaleMapperFreeze(this, res.mapper);
    }

    private static parse(this: OrdinalScale, val: OrdinalRawValue | OrdinalNumber): OrdinalNumber {
        // Caution: Math.round(null) will return `0` rather than `NaN`