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string]: any } = {\n    regionStyle: [\n      {\n        position: {\n          start: [xBaseline, 'max'],\n          end: ['max', yBaseline],\n        },\n        style: {\n          fill: '#d8d0c0',\n          opacity: 0.4,\n        },\n      },\n      {\n        position: {\n          start: ['min', 'max'],\n          end: [xBaseline, yBaseline],\n        },\n        style: {\n          fill: '#a3dda1',\n          opacity: 0.4,\n        },\n      },\n      {\n        position: {\n          start: ['min', yBaseline],\n          end: [xBaseline, 'min'],\n        },\n        style: {\n          fill: '#d8d0c0',\n          opacity: 0.4,\n        },\n      },\n      {\n        position: {\n          start: [xBaseline, yBaseline],\n          end: ['max', 'min'],\n        },\n        style: {\n          fill: '#a3dda1',\n          opacity: 0.4,\n        },\n      },\n    ],\n    lineStyle: {\n      stroke: '#9ba29a',\n      lineWidth: 1,\n    },\n    labelStyle: [\n      {\n        position: ['max', yBaseline],\n        offsetX: -textOffset,\n        offsetY: -textOffset,\n        style: {\n          textAlign: 'right',\n          textBaseline: 'bottom',\n          fontSize: 14,\n          fill: '#ccc',\n        },\n      },\n      {\n        position: ['min', yBaseline],\n        offsetX: textOffset,\n        offsetY: -textOffset,\n        style: {\n          textAlign: 'left',\n          textBaseline: 'bottom',\n          fontSize: 14,\n          fill: '#ccc',\n        },\n      },\n      {\n        position: ['min', yBaseline],\n        offsetX: textOffset,\n        offsetY: textOffset,\n        style: {\n          textAlign: 'left',\n          textBaseline: 'top',\n          fontSize: 14,\n          fill: '#ccc',\n        },\n      },\n      {\n        position: ['max', yBaseline],\n        offsetX: -textOffset,\n        offsetY: textOffset,\n        style: {\n          textAlign: 'right',\n          textBaseline: 'top',\n          fontSize: 14,\n          fill: '#ccc',\n        },\n      },\n    ],\n  };\n  return defaultConfig;\n}\n\nconst splinePath = (data: number[][], config: RenderOptions) => {\n  const {\n    view,\n    options: { xField, yField },\n  } = config;\n  const xScaleView = view.getScaleByField(xField);\n  const yScaleView = view.getScaleByField(yField);\n  const pathData = data.map((d: [number, number]) =>\n    view.getCoordinate().convert({ x: xScaleView.scale(d[0]), y: yScaleView.scale(d[1]) })\n  );\n  return getSplinePath(pathData, false);\n};\n\nexport const getPath = (config: RenderOptions) => {\n  const { options } = config;\n  const { xField, yField, data, regressionLine } = options;\n  const { type = 'linear', algorithm, equation: customEquation } = regressionLine;\n  let pathData: Array<[number, number]>;\n  let equation = null;\n  if (algorithm) {\n    pathData = isArray(algorithm) ? algorithm : algorithm(data);\n    equation = customEquation;\n  } else {\n    const reg = REGRESSION_MAP[type]()\n      .x((d) => d[xField])\n      .y((d) => d[yField]);\n    pathData = reg(data);\n    equation = getRegressionEquation(type, pathData as D3RegressionResult);\n  }\n  return [splinePath(pathData, config), equation];\n};\n\n/**\n * 调整散点图 meta: { min, max } ① data.length === 1 ② 所有数据 y 值相等 ③ 所有数据 x 值相等\n * @param options\n * @returns\n */\nexport const getMeta = (\n  options: Pick<ScatterOptions, 'meta' | 'xField' | 'yField' | 'data'>\n): ScatterOptions['meta'] => {\n  const { meta = {}, xField, yField, data } = options;\n  const xFieldValue = data[0][xField];\n  const yFieldValue = data[0][yField];\n  const xIsPositiveNumber = xFieldValue > 0;\n  const yIsPositiveNumber = yFieldValue > 0;\n\n  /**\n   * 获得对应字段的 min max scale 配置\n   */\n  function getMetaMinMax(field: string, axis: 'x' | 'y') {\n    const fieldMeta = get(meta, [field]);\n\n    function getCustomValue(type: 'min' | 'max') {\n      return get(fieldMeta, type);\n    }\n\n    const range = {};\n\n    if (axis === 'x') {\n      if (isNumber(xFieldValue)) {\n        if (!isNumber(getCustomValue('min'))) {\n          range['min'] = xIsPositiveNumber ? 0 : xFieldValue * 2;\n        }\n\n        if (!isNumber(getCustomValue('max'))) {\n          range['max'] = xIsPositiveNumber ? xFieldValue * 2 : 0;\n        }\n      }\n\n      return range;\n    }\n\n    if (isNumber(yFieldValue)) {\n      if (!isNumber(getCustomValue('min'))) {\n        range['min'] = yIsPositiveNumber ? 0 : yFieldValue * 2;\n      }\n\n      if (!isNumber(getCustomValue('max'))) {\n        range['max'] = yIsPositiveNumber ? yFieldValue * 2 : 0;\n      }\n    }\n\n    return range;\n  }\n\n  return {\n    ...meta,\n    [xField]: {\n      ...meta[xField],\n      ...getMetaMinMax(xField, 'x'),\n    },\n    [yField]: {\n      ...meta[yField],\n      ...getMetaMinMax(yField, 'y'),\n    },\n  };\n};\n\n/**\n * 获取回归函数表达式\n * @param {string} type - 回归函数类型\n * @param {D3RegressionResult} res - 回归计算结果集\n * @return {string}\n */\nexport function getRegressionEquation(type: string, res: D3RegressionResult) {\n  const roundByPrecision = (n, p = 4) => Math.round(n * Math.pow(10, p)) / Math.pow(10, p);\n  const safeFormat = (value) => (Number.isFinite(value) ? roundByPrecision(value) : '?');\n\n  switch (type) {\n    case 'linear':\n      // y = ax + b\n      return `y = ${safeFormat(res.a)}x + ${safeFormat(res.b)}, R^2 = ${safeFormat(res.rSquared)}`;\n    case 'exp':\n      // y = ae^(bx)\n      return `y = ${safeFormat(res.a)}e^(${safeFormat(res.b)}x), R^2 = ${safeFormat(res.rSquared)}`;\n    case 'log':\n      // y = a · ln(x) + b\n      return `y = ${safeFormat(res.a)}ln(x) + ${safeFormat(res.b)}, R^2 = ${safeFormat(res.rSquared)}`;\n    case 'quad':\n      // y = ax^2 + bx + c\n      return `y = ${safeFormat(res.a)}x^2 + ${safeFormat(res.b)}x + ${safeFormat(res.c)}, R^2 = ${safeFormat(\n        res.rSquared\n      )}`;\n    case 'poly':\n      // y = anx^n + ... + a1x + a0\n      // eslint-disable-next-line no-case-declarations\n      let temp = `y = ${safeFormat(res.coefficients?.[0])} + ${safeFormat(res.coefficients?.[1])}x + ${safeFormat(\n        res.coefficients?.[2]\n      )}x^2`;\n      for (let i = 3; i < res.coefficients.length; ++i) {\n        temp += ` + ${safeFormat(res.coefficients[i])}x^${i}`;\n      }\n      return `${temp}, R^2 = ${safeFormat(res.rSquared)}`;\n    case 'pow':\n      // y = ax^b\n      return `y = ${safeFormat(res.a)}x^${safeFormat(res.b)}, R^2 = ${safeFormat(res.rSquared)}`;\n  }\n  return null;\n}\n"]}