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{ deepMix, each, get, isArray, isFunction, isNil, isNumber, isString, isUndefined } from '@antv/util';\n\nimport { FIELD_ORIGIN } from '../../constant';\nimport { Scale } from '../../dependents';\nimport { Datum, LabelOption, MappingDatum, Point } from '../../interface';\nimport { LabelCfg, LabelItem, LabelPointCfg, TextAlign } from './interface';\n\nimport { getDefaultAnimateCfg } from '../../animate';\nimport { getPolygonCentroid } from '../../util/graphics';\n\nimport Labels from '../../component/labels';\nimport Geometry from '../base';\nimport Element from '../element';\n\nexport type GeometryLabelConstructor = new (cfg: any) => GeometryLabel;\n\nfunction avg(arr: number[]) {\n  let sum = 0;\n  each(arr, (value: number) => {\n    sum += value;\n  });\n  return sum / arr.length;\n}\n\n/**\n * Geometry Label 基类，用于生成 Geometry 下所有 label 的配置项信息\n */\nexport default class GeometryLabel {\n  /** geometry 实例 */\n  public readonly geometry: Geometry;\n  public labelsRenderer: Labels;\n  /** 默认的布局 */\n  public defaultLayout: string;\n\n  constructor(geometry: Geometry) {\n    this.geometry = geometry;\n  }\n\n  public getLabelItems(mapppingArray: MappingDatum[]): LabelItem[] {\n    const items = [];\n    const labelCfgs = this.getLabelCfgs(mapppingArray);\n    // 获取 label 相关的 x，y 的值，获取具体的 x, y，防止存在数组\n    each(mapppingArray, (mappingData: MappingDatum, index: number) => {\n      const labelCfg = labelCfgs[index];\n      if (!labelCfg || isNil(mappingData.x) || isNil(mappingData.y)) {\n        items.push(null);\n        return;\n      }\n\n      const labelContent = !isArray(labelCfg.content) ? [labelCfg.content] : labelCfg.content;\n      labelCfg.content = labelContent;\n      const total = labelContent.length;\n      each(labelContent, (content, subIndex) => {\n        if (isNil(content) || content === '') {\n          items.push(null);\n          return;\n        }\n\n        const item = {\n          ...labelCfg,\n          ...this.getLabelPoint(labelCfg, mappingData, subIndex),\n        };\n        if (!item.textAlign) {\n          item.textAlign = this.getLabelAlign(item, subIndex, total);\n        }\n\n        if (item.offset <= 0) {\n          item.labelLine = null;\n        }\n\n        items.push(item);\n      });\n    });\n    return items;\n  }\n\n  public async render(mappingArray: MappingDatum[], isUpdate: boolean = false) {\n    const labelItems = this.getLabelItems(mappingArray);\n    const labelsRenderer = this.getLabelsRenderer();\n    const shapes = this.getGeometryShapes();\n    // 渲染文本\n    await labelsRenderer.render(labelItems, shapes, isUpdate);\n  }\n\n  public clear() {\n    const labelsRenderer = this.labelsRenderer;\n    if (labelsRenderer) {\n      labelsRenderer.clear();\n    }\n  }\n\n  public destroy() {\n    const labelsRenderer = this.labelsRenderer;\n    if (labelsRenderer) {\n      labelsRenderer.destroy();\n    }\n    this.labelsRenderer = null;\n  }\n\n  // geometry 更新之后，对应的 Coordinate 也会更新，为了获取到最新鲜的 Coordinate，故使用方法获取\n  public getCoordinate() {\n    return this.geometry.coordinate;\n  }\n\n  /**\n   * 获取 label 的默认配置\n   */\n  protected getDefaultLabelCfg(offset?: number, position?: string) {\n    const geometry = this.geometry;\n    const { type, theme } = geometry;\n\n    if (\n      type === 'polygon' ||\n      (type === 'interval' && position === 'middle') ||\n      (offset < 0 && !['line', 'point', 'path'].includes(type))\n    ) {\n      // polygon 或者 (interval 且 middle) 或者 offset 小于 0 时，文本展示在图形内部，将其颜色设置为 白色\n      return get(theme, 'innerLabels', {});\n    }\n\n    return get(theme, 'labels', {});\n  }\n\n  /**\n   * 获取当前 label 的最终配置\n   * @param labelCfg\n   */\n  protected getThemedLabelCfg(labelCfg: LabelCfg) {\n    const geometry = this.geometry;\n    const defaultLabelCfg = this.getDefaultLabelCfg();\n    const { type, theme } = geometry;\n    let themedLabelCfg;\n\n    if (type === 'polygon' || (labelCfg.offset < 0 && !['line', 'point', 'path'].includes(type))) {\n      // polygon 或者 offset 小于 0 时，文本展示在图形内部，将其颜色设置为 白色\n      themedLabelCfg = deepMix({}, defaultLabelCfg, theme.innerLabels, labelCfg);\n    } else {\n      themedLabelCfg = deepMix({}, defaultLabelCfg, theme.labels, labelCfg);\n    }\n\n    return themedLabelCfg;\n  }\n\n  /**\n   * 设置 label 位置\n   * @param labelPointCfg\n   * @param mappingData\n   * @param index\n   * @param position\n   */\n  protected setLabelPosition(\n    labelPointCfg: LabelPointCfg,\n    mappingData: MappingDatum,\n    index: number,\n    position: string\n  ) {}\n\n  /**\n   * @desc 获取 label offset\n   */\n  protected getLabelOffset(offset: number | string): number {\n    const coordinate = this.getCoordinate();\n    const vector = this.getOffsetVector(offset);\n    return coordinate.isTransposed ? vector[0] : vector[1];\n  }\n\n  /**\n   * 获取每个 label 的偏移量 (矢量)\n   * @param labelCfg\n   * @param index\n   * @param total\n   * @return {Point} offsetPoint\n   */\n  protected getLabelOffsetPoint(labelCfg: LabelCfg, index: number, total: number): Point {\n    const offset = labelCfg.offset;\n    const coordinate = this.getCoordinate();\n    const transposed = coordinate.isTransposed;\n    const dim = transposed ? 'x' : 'y';\n    const factor = transposed ? 1 : -1; // y 方向上越大，像素的坐标越小，所以transposed时将系数变成\n    const offsetPoint = {\n      x: 0,\n      y: 0,\n    };\n    if (index > 0 || total === 1) {\n      // 判断是否小于0\n      offsetPoint[dim] = offset * factor;\n    } else {\n      offsetPoint[dim] = offset * factor * -1;\n    }\n    return offsetPoint;\n  }\n\n  /**\n   * 获取每个 label 的位置\n   * @param labelCfg\n   * @param mappingData\n   * @param index\n   * @returns label point\n   */\n  protected getLabelPoint(labelCfg: LabelCfg, mappingData: MappingDatum, index: number): LabelPointCfg {\n    const coordinate = this.getCoordinate();\n    const total = labelCfg.content.length;\n\n    function getDimValue(value: number | number[], idx: number, isAvg = false) {\n      let v = value;\n      if (isArray(v)) {\n        if (labelCfg.content.length === 1) {\n          if (isAvg) {\n            v = avg(v);\n          } else {\n            // 如果仅一个 label，多个 y, 取最后一个 y\n            if (v.length <= 2) {\n              v = v[(value as number[]).length - 1];\n            } else {\n              v = avg(v);\n            }\n          }\n        } else {\n          v = v[idx];\n        }\n      }\n      return v;\n    }\n\n    const label = {\n      content: labelCfg.content[index],\n      x: 0,\n      y: 0,\n      start: { x: 0, y: 0 },\n      color: '#fff',\n    };\n    const shape = isArray(mappingData.shape) ? mappingData.shape[0] : mappingData.shape;\n    const isFunnel = shape === 'funnel' || shape === 'pyramid';\n\n    // 多边形场景，多用于地图\n    if (this.geometry.type === 'polygon') {\n      const centroid = getPolygonCentroid(mappingData.x, mappingData.y);\n      label.x = centroid[0];\n      label.y = centroid[1];\n    } else if (this.geometry.type === 'interval' && !isFunnel) {\n      // 对直方图的label X 方向的位置居中\n      label.x = getDimValue(mappingData.x, index, true);\n      label.y = getDimValue(mappingData.y, index);\n    } else {\n      label.x = getDimValue(mappingData.x, index);\n      label.y = getDimValue(mappingData.y, index);\n    }\n\n    // 处理漏斗图文本位置\n    if (isFunnel) {\n      const nextPoints = get(mappingData, 'nextPoints');\n      const points = get(mappingData, 'points');\n      if (nextPoints) {\n        // 非漏斗图底部\n        const point1 = coordinate.convert(points[1] as Point);\n        const point2 = coordinate.convert(nextPoints[1] as Point);\n        label.x = (point1.x + point2.x) / 2;\n        label.y = (point1.y + point2.y) / 2;\n      } else if (shape === 'pyramid') {\n        const point1 = coordinate.convert(points[1] as Point);\n        const point2 = coordinate.convert(points[2] as Point);\n        label.x = (point1.x + point2.x) / 2;\n        label.y = (point1.y + point2.y) / 2;\n      }\n    }\n\n    if (labelCfg.position) {\n      // 如果 label 支持 position 属性\n      this.setLabelPosition(label, mappingData, index, labelCfg.position);\n    }\n    const offsetPoint = this.getLabelOffsetPoint(labelCfg, index, total);\n    label.start = { x: label.x, y: label.y };\n    label.x += offsetPoint.x;\n    label.y += offsetPoint.y;\n    label.color = mappingData.color;\n    return label;\n  }\n\n  /**\n   * 获取文本的对齐方式\n   * @param item\n   * @param index\n   * @param total\n   * @returns\n   */\n  protected getLabelAlign(item: LabelItem, index: number, total: number): TextAlign {\n    let align: TextAlign = 'center';\n    const coordinate = this.getCoordinate();\n    if (coordinate.isTransposed) {\n      const offset = item.offset;\n      if (offset < 0) {\n        align = 'right';\n      } else if (offset === 0) {\n        align = 'center';\n      } else {\n        align = 'left';\n      }\n      if (total > 1 && index === 0) {\n        if (align === 'right') {\n          align = 'left';\n        } else if (align === 'left') {\n          align = 'right';\n        }\n      }\n    }\n    return align;\n  }\n\n  /**\n   * 获取每一个 label 的唯一 id\n   * @param mappingData label 对应的图形的绘制数据\n   */\n  protected getLabelId(mappingData: MappingDatum) {\n    const geometry = this.geometry;\n    const type = geometry.type;\n    const xScale = geometry.getXScale();\n    const yScale = geometry.getYScale();\n    const origin = mappingData[FIELD_ORIGIN]; // 原始数据\n\n    let labelId = geometry.getElementId(mappingData);\n    if (type === 'line' || type === 'area') {\n      // 折线图以及区域图，一条线会对应一组数据，即多个 labels，为了区分这些 labels，需要在 line id 的前提下加上 x 字段值\n      labelId += ` ${origin[xScale.field]}`;\n    } else if (type === 'path') {\n      // path 路径图，无序，有可能存在相同 x 不同 y 的情况，需要通过 x y 来确定唯一 id\n      labelId += ` ${origin[xScale.field]}-${origin[yScale.field]}`;\n    }\n\n    return labelId;\n  }\n\n  // 获取 labels 组件\n  private getLabelsRenderer() {\n    const { labelsContainer, labelOption, canvasRegion, animateOption } = this.geometry;\n    const coordinate = this.geometry.coordinate;\n\n    let labelsRenderer = this.labelsRenderer;\n    if (!labelsRenderer) {\n      labelsRenderer = new Labels({\n        container: labelsContainer,\n        layout: get(labelOption, ['cfg', 'layout'], {\n          type: this.defaultLayout,\n        }),\n      });\n      this.labelsRenderer = labelsRenderer;\n    }\n    labelsRenderer.region = canvasRegion;\n    // 设置动画配置，如果 geometry 的动画关闭了，那么 label 的动画也会关闭\n    labelsRenderer.animate = animateOption ? getDefaultAnimateCfg('label', coordinate) : false;\n\n    return labelsRenderer;\n  }\n\n  private getLabelCfgs(mapppingArray: MappingDatum[]): LabelCfg[] {\n    const geometry = this.geometry;\n    const { labelOption, scales, coordinate } = geometry;\n    const { fields, callback, cfg } = labelOption as LabelOption;\n    const labelScales = fields.map((field: string) => {\n      return scales[field];\n    });\n\n    const labelCfgs: LabelCfg[] = [];\n    each(mapppingArray, (mappingData: MappingDatum, index: number) => {\n      const origin = mappingData[FIELD_ORIGIN]; // 原始数据\n      const originText = this.getLabelText(origin, labelScales);\n      let callbackCfg;\n      if (callback) {\n        // 当同时配置了 callback 和 cfg 时，以 callback 为准\n        const originValues = fields.map((field: string) => origin[field]);\n        callbackCfg = callback(...originValues);\n        if (isNil(callbackCfg)) {\n          labelCfgs.push(null);\n          return;\n        }\n      }\n\n      let labelCfg = {\n        id: this.getLabelId(mappingData), // 进行 ID 标记\n        elementId: this.geometry.getElementId(mappingData), // label 对应 Element 的 ID\n        data: origin, // 存储原始数据\n        mappingData, // 存储映射后的数据,\n        coordinate, // 坐标系\n        ...cfg,\n        ...callbackCfg,\n      };\n\n      if (isFunction(labelCfg.position)) {\n        labelCfg.position = labelCfg.position(origin, mappingData, index);\n      }\n\n      const offset = this.getLabelOffset(labelCfg.offset || 0);\n      // defaultCfg 需要判断 innerLabels & labels\n      const defaultLabelCfg = this.getDefaultLabelCfg(offset, labelCfg.position);\n      // labelCfg priority: defaultCfg < cfg < callbackCfg\n      labelCfg = deepMix({}, defaultLabelCfg, labelCfg);\n      // 获取最终的 offset\n      labelCfg.offset = this.getLabelOffset(labelCfg.offset || 0);\n\n      const content = labelCfg.content;\n      if (isFunction(content)) {\n        labelCfg.content = content(origin, mappingData, index);\n      } else if (isUndefined(content)) {\n        // 用户未配置 content，则默认为映射的第一个字段的值\n        labelCfg.content = originText[0];\n      }\n\n      labelCfgs.push(labelCfg);\n    });\n\n    return labelCfgs;\n  }\n\n  private getLabelText(origin: Datum, scales: Scale[]) {\n    const labelTexts = [];\n    each(scales, (scale: Scale) => {\n      let value = origin[scale.field];\n      if (isArray(value)) {\n        value = value.map((subVal) => {\n          return scale.getText(subVal);\n        });\n      } else {\n        value = scale.getText(value);\n      }\n\n      if (isNil(value) || value === '') {\n        labelTexts.push(null);\n      } else {\n        labelTexts.push(value);\n      }\n    });\n    return labelTexts;\n  }\n\n  private getOffsetVector(offset: number | string = 0) {\n    const coordinate = this.getCoordinate();\n    let actualOffset = 0;\n    if (isNumber(offset)) {\n      actualOffset = offset;\n    }\n    // 如果 x,y 翻转，则偏移 x，否则偏移 y\n    return coordinate.isTransposed ? coordinate.applyMatrix(actualOffset, 0) : coordinate.applyMatrix(0, actualOffset);\n  }\n\n  private getGeometryShapes() {\n    const geometry = this.geometry;\n    const shapes = {};\n    each(geometry.elementsMap, (element: Element, id: string) => {\n      shapes[id] = element.shape;\n    });\n    // 因为有可能 shape 还在进行动画，导致 shape.getBBox() 获取到的值不是最终态，所以需要从 offscreenGroup 获取\n    each(geometry.getOffscreenGroup().getChildren(), (child) => {\n      const id = geometry.getElementId(child.get('origin').mappingData);\n      shapes[id] = child;\n    });\n\n    return shapes;\n  }\n}\n"]}