Function makeColorMethod

src/common/base.ts:129–142

* 生成 "getColor" 函数

()

   * 生成 "getColor" 函数
   */
  protected makeColorMethod(): () => string {
    const { color } = this.options
    const colorLength = Array.isArray(color) ? color.length : 0

    if (isString(color)) {
      return () => color as string
    }

    if (colorLength === 0) {
      return randomColor
    }

    return () => (color as string[])[Math.floor(Math.random() * colorLength)]
  }

  /**
   * 设置画布尺寸