本目录（public/charts/）内的文件来自第三方项目 data-to-viz，
原作者 Yan Holtz（https://www.data-to-viz.com）与图形设计 Conor Healy
（https://www.conor.fr）。原项目以 MIT License 发布。

以下内容按原样保留，仅增加了中文注释、页面适配层与少量样式调整：

  agency.css                来自 Start Bootstrap "Agency" 模板
  bootstrap.bundle.min.js   Bootstrap 4（MIT）
  bootstrap.min.css         Bootstrap 4（MIT）
  d3.v4.min.js              D3.js v4（BSD-3-Clause）
  font-awesome.min.css      Font Awesome 4.x（代码 MIT / 字体 SIL OFL 1.1）
  jquery.min.js             jQuery 3.3.1（MIT）
  tree.js                   data-to-viz 的决策树切换脚本
  img/                      图表缩略图与「数据表示意图」配图（data-to-viz，MIT）

原始项目：https://github.com/holtzy/data_to_viz

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MIT License

Copyright (c) 2017 Holtz Yan

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.


==========================================================================
以下为本目录内各第三方库自身的许可声明
==========================================================================

d3.v4.min.js — D3.js v4.13.0
  https://github.com/d3/d3/blob/master/LICENSE
  文件内只带了一行版权注释，BSD-3-Clause 要求分发时附完整文本，故在此补全。

  Copyright 2018 Mike Bostock
  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:
  * Redistributions of source code must retain the above copyright notice,
    this list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation
    and/or other materials provided with the distribution.
  * Neither the name of the author nor the names of contributors may be used
    to endorse or promote products derived from this software without specific
    prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  POSSIBILITY OF SUCH DAMAGE.

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以下库的压缩文件头部已自带许可声明（原文照录），此处仅作索引：

bootstrap.bundle.min.js / bootstrap.min.css
  Bootstrap v4.0.0
  Copyright 2011-2018 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
  Copyright 2011-2018 Twitter, Inc.
  Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)

jquery.min.js
  jQuery v3.3.1 | (c) JS Foundation and other contributors | jquery.org/license
  License: https://jquery.org/license/

font-awesome.min.css
  Font Awesome 4.7.0 by @davegandy - http://fontawesome.io - @fontawesome
  License - http://fontawesome.io/license
  (Font: SIL OFL 1.1, CSS: MIT License)