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{ Chart, Types } from '@antv/g2';\r\nimport { isArray, isFunction, isString } from '@antv/util';\r\nimport { Params } from '../../core/adaptor';\r\nimport { Datum } from '../../types';\r\nimport { getContainerSize, LEVEL, log } from '../../utils';\r\nimport { normalPadding } from '../../utils/padding';\r\nimport { functor, wordCloud } from '../../utils/transform/word-cloud';\r\nimport { Tag, Word, WordCloudOptions, WordStyle } from './types';\r\n\r\n/**\r\n * 用 DataSet 转换词云图数据\r\n * @param params\r\n */\r\nexport function transform(params: Params<WordCloudOptions>): Tag[] {\r\n  const { options: rawOptions, chart } = params;\r\n  const { width, height, padding: chartPadding, appendPadding, ele } = chart as Chart;\r\n  const {\r\n    data,\r\n    imageMask,\r\n    wordField,\r\n    weightField,\r\n    colorField,\r\n    wordStyle,\r\n    timeInterval,\r\n    random,\r\n    spiral,\r\n    autoFit = true,\r\n    placementStrategy,\r\n  } = rawOptions;\r\n  if (!data || !data.length) {\r\n    return [];\r\n  }\r\n  const { fontFamily, fontWeight, padding, fontSize } = wordStyle;\r\n  const arr = getSingleKeyValues(data, weightField);\r\n  const range = [min(arr), max(arr)] as [number, number];\r\n\r\n  // 变换出 text 和 value 字段\r\n  const words = data.map(\r\n    (datum: Datum): Word => ({\r\n      text: datum[wordField],\r\n      value: datum[weightField],\r\n      color: datum[colorField],\r\n      datum, // 存一下原始数据\r\n    })\r\n  );\r\n\r\n  const options = {\r\n    imageMask: imageMask as HTMLImageElement,\r\n    font: fontFamily,\r\n    fontSize: getFontSizeMapping(fontSize, range),\r\n    fontWeight: fontWeight,\r\n    // 图表宽高减去 padding 之后的宽高\r\n    size: getSize({\r\n      width,\r\n      height,\r\n      padding: chartPadding,\r\n      appendPadding,\r\n      autoFit,\r\n      container: ele,\r\n    }),\r\n    padding: padding,\r\n    timeInterval,\r\n    random,\r\n    spiral,\r\n    rotate: getRotate(rawOptions),\r\n  };\r\n\r\n  // 自定义布局函数\r\n  if (isFunction(placementStrategy)) {\r\n    const result = words.map((word: Word, index: number, words: Word[]) => ({\r\n      ...word,\r\n      hasText: !!word.text,\r\n      font: functor(options.font)(word, index, words),\r\n      weight: functor(options.fontWeight)(word, index, words),\r\n      rotate: functor(options.rotate)(word, index, words),\r\n      size: functor(options.fontSize)(word, index, words),\r\n      style: 'normal',\r\n      ...placementStrategy.call(chart, word, index, words),\r\n    }));\r\n\r\n    // 添加两个参照数据，分别表示左上角和右下角\r\n    result.push({\r\n      text: '',\r\n      value: 0,\r\n      x: 0,\r\n      y: 0,\r\n      opacity: 0,\r\n    });\r\n    result.push({\r\n      text: '',\r\n      value: 0,\r\n      x: options.size[0],\r\n      y: options.size[1],\r\n      opacity: 0,\r\n    });\r\n\r\n    return result;\r\n  }\r\n\r\n  // 数据准备在外部做，wordCloud 单纯就是做布局\r\n  return wordCloud(words, options);\r\n}\r\n\r\n/**\r\n * 获取最终的实际绘图尺寸：[width, height]\r\n * @param chart\r\n */\r\nexport function getSize(options: {\r\n  width: number;\r\n  height: number;\r\n  padding: Types.ViewPadding;\r\n  appendPadding: Types.ViewAppendPadding;\r\n  autoFit: boolean;\r\n  container: HTMLElement;\r\n}): [number, number] {\r\n  let { width, height } = options;\r\n  const { container, autoFit, padding, appendPadding } = options;\r\n\r\n  // 由于词云图每个词语的坐标都是先通过 DataSet 根据图表宽高计算出来的，\r\n  // 也就是说，如果一开始提供给 DataSet 的宽高信息和最终显示的宽高不相同，\r\n  // 那么就会出现布局错乱的情况，所以这里处理的目的就是让一开始提供给 DataSet 的\r\n  // 宽高信息与最终显示的宽高信息相同，避免显示错乱。\r\n  if (autoFit) {\r\n    const containerSize = getContainerSize(container);\r\n    width = containerSize.width;\r\n    height = containerSize.height;\r\n  }\r\n\r\n  // 宽高不能为 0，否则会造成死循环\r\n  width = width || 400;\r\n  height = height || 400;\r\n\r\n  const [top, right, bottom, left] = resolvePadding({ padding, appendPadding });\r\n  const result = [width - (left + right), height - (top + bottom)];\r\n\r\n  return result as [number, number];\r\n}\r\n\r\n/**\r\n * 根据图表的 padding 和 appendPadding 计算出图表的最终 padding\r\n * @param chart\r\n */\r\nfunction resolvePadding(options: { padding: Types.ViewPadding; appendPadding: Types.ViewAppendPadding }) {\r\n  const padding = normalPadding(options.padding);\r\n  const appendPadding = normalPadding(options.appendPadding);\r\n  const top = padding[0] + appendPadding[0];\r\n  const right = padding[1] + appendPadding[1];\r\n  const bottom = padding[2] + appendPadding[2];\r\n  const left = padding[3] + appendPadding[3];\r\n\r\n  return [top, right, bottom, left];\r\n}\r\n\r\n/**\r\n * 处理 imageMask 可能为 url 字符串的情况\r\n * @param  {HTMLImageElement | string} img\r\n * @return {Promise}\r\n */\r\nexport function processImageMask(img: HTMLImageElement | string): Promise<HTMLImageElement> {\r\n  return new Promise((res, rej) => {\r\n    if (img instanceof HTMLImageElement) {\r\n      res(img);\r\n      return;\r\n    }\r\n    if (isString(img)) {\r\n      const image = new Image();\r\n      image.crossOrigin = 'anonymous';\r\n      image.src = img;\r\n      image.onload = () => {\r\n        res(image);\r\n      };\r\n      image.onerror = () => {\r\n        log(LEVEL.ERROR, false, 'image %s load failed !!!', img);\r\n        rej();\r\n      };\r\n      return;\r\n    }\r\n    log(LEVEL.WARN, img === undefined, 'The type of imageMask option must be String or HTMLImageElement.');\r\n    rej();\r\n  });\r\n}\r\n\r\n/**\r\n * 把用户提供的 fontSize 值转换成符合 DataSet 要求的值\r\n * @param options\r\n * @param range\r\n */\r\nexport function getFontSizeMapping(fontSize: WordStyle['fontSize'], range?: [number, number]) {\r\n  if (isFunction(fontSize)) {\r\n    return fontSize;\r\n  }\r\n  if (isArray(fontSize)) {\r\n    const [fMin, fMax] = fontSize;\r\n    if (!range) {\r\n      return () => (fMax + fMin) / 2;\r\n    }\r\n    const [min, max] = range;\r\n    if (max === min) {\r\n      return () => (fMax + fMin) / 2;\r\n    }\r\n    return function fontSize({ value }) {\r\n      return ((fMax - fMin) / (max - min)) * (value - min) + fMin;\r\n    };\r\n  }\r\n  return () => fontSize;\r\n}\r\n\r\nexport function getSingleKeyValues(data: Datum[], key: string) {\r\n  return data\r\n    .map((v) => v[key])\r\n    .filter((v) => {\r\n      // 过滤非 number\r\n      if (typeof v === 'number' && !isNaN(v)) return true;\r\n      return false;\r\n    });\r\n}\r\n\r\n/**\r\n * 把用户提供的关于旋转角度的字段值转换成符合 DataSet 要求的值\r\n * @param options\r\n */\r\nfunction getRotate(options: WordCloudOptions) {\r\n  const { rotation, rotationSteps } = resolveRotate(options);\r\n  if (!isArray(rotation)) return rotation;\r\n  const min = rotation[0];\r\n  const max = rotation[1];\r\n  // 等于 1 时不旋转，所以把每份大小设为 0\r\n  const perSize = rotationSteps === 1 ? 0 : (max - min) / (rotationSteps - 1);\r\n  return function rotate() {\r\n    if (max === min) return max;\r\n    return Math.floor(Math.random() * rotationSteps) * perSize;\r\n  };\r\n}\r\n\r\n/**\r\n * 确保值在要求范围内\r\n * @param options\r\n */\r\nfunction resolveRotate(options: WordCloudOptions) {\r\n  let { rotationSteps } = options.wordStyle;\r\n  if (rotationSteps < 1) {\r\n    log(LEVEL.WARN, false, 'The rotationSteps option must be greater than or equal to 1.');\r\n    rotationSteps = 1;\r\n  }\r\n  return {\r\n    rotation: options.wordStyle.rotation,\r\n    rotationSteps,\r\n  };\r\n}\r\n\r\n/**\r\n * 传入一个元素为数字的数组，\r\n * 返回该数组中值最小的数字。\r\n * @param numbers\r\n */\r\nfunction min(numbers: number[]) {\r\n  return Math.min(...numbers);\r\n}\r\n\r\n/**\r\n * 传入一个元素为数字的数组，\r\n * 返回该数组中值最大的数字。\r\n * @param numbers\r\n */\r\nfunction max(numbers: number[]) {\r\n  return Math.max(...numbers);\r\n}\r\n"]}