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// 画布半径\n    // 画布圆心\n    const center = { x: 0.5, y: 0.5 };\n    // 每隔分面间隔的弧度\n    const avgAngle = (Math.PI * 2) / count;\n\n    // 当前分面所在的弧度\n    const angle = (-1 * Math.PI) / 2 + avgAngle * index;\n    // TODO 没看懂\n    const facetR = r / (1 + 1 / Math.sin(avgAngle / 2));\n    // 分面的中心点\n    const middle = getAnglePoint(center, r - facetR, angle);\n    const startAngle = (Math.PI * 5) / 4; // 右上角\n    const endAngle = (Math.PI * 1) / 4; // 左下角\n\n    return {\n      start: getAnglePoint(middle, facetR, startAngle),\n      end: getAnglePoint(middle, facetR, endAngle),\n    };\n  }\n\n  protected afterEachView(view: View, facet: CircleData) {\n    this.processAxis(view, facet);\n  }\n\n  protected beforeEachView(view: View, facet: CircleData) {}\n\n  protected generateFacets(data: Datum[]): CircleData[] {\n    const { fields, type } = this.cfg;\n    const [field] = fields;\n    if (!field) {\n      throw new Error('No `fields` specified!');\n    }\n\n    const values = this.getFieldValues(data, field);\n    const count = values.length;\n\n    const rst = [];\n    values.forEach((value: any, index: number) => {\n      const conditions = [{ field, value, values }];\n      const facetData = filter(data, this.getFacetDataFilter(conditions));\n\n      const facet: CircleData = {\n        type,\n        data: facetData,\n        region: this.getRegion(count, index),\n\n        columnValue: value,\n        columnField: field,\n        columnIndex: index,\n        columnValuesLength: count,\n\n        rowValue: null,\n        rowField: null,\n        rowIndex: 0,\n        rowValuesLength: 1,\n      };\n      rst.push(facet);\n    });\n    return rst;\n  }\n\n  protected getXAxisOption(x: string, axes: any, option: AxisCfg, facet: CircleData): object {\n    // 不做任何处理\n    return option;\n  }\n\n  /**\n   * 设置 y 坐标轴的文本、title 是否显示\n   * @param y\n   * @param axes\n   * @param option\n   * @param facet\n   */\n  protected getYAxisOption(y: string, axes: any, option: AxisCfg, facet: CircleData): object {\n    // 不做任何处理\n    return option;\n  }\n\n  /**\n   * facet title\n   */\n  private renderTitle() {\n    each(this.facets, (facet: CircleData) => {\n      const { columnValue, view } = facet;\n      const formatter = get(this.cfg.title, 'formatter');\n\n      const config = deepMix(\n        {\n          position: ['50%', '0%'] as [string, string],\n          content: formatter ? formatter(columnValue) : columnValue,\n        },\n        getFactTitleConfig(DIRECTION.TOP),\n        this.cfg.title\n      );\n\n      view.annotation().text(config);\n    });\n  }\n}\n"]}