I've implemented a word cloud generator called WordCloud.jl in Julia language. A brief description about its algorithm can be found here. Unlike most other implementations, I designed it based on gradient optimization. It’s a non-greedy algorithm in which words can be further moved after they are positioned. Thus the size of the words and the shape and size of the background mask can be kept unchanged in the generation process. This makes the outputs more accurate and easy to customize. Furthermore, we can also generate some fancy outputs like these: Comparison of Obama's and Trump's inaugural address and Wikipedia: Julia

http://code.google.com/apis/visualization/documentation/gallery.html

看看单词云可视化。不像wordle.net那么花哨，但很容易添加到你的网站。

我是Wordle的创造者。以下是Wordle的实际工作原理:

数单词，扔掉无聊的单词，按数量排序，降序排列。保留前N个单词的N个，为每个单词分配与其计数成比例的字体大小。使用Java2D API为每个单词生成一个Java2D Shape。

每个单词“都想”在某个地方，比如“在垂直中心的某个随机x位置”。按照出现频率的递减顺序，对每个单词执行以下操作:

place the word where it wants to be
while it intersects any of the previously placed words
    move it one step along an ever-increasing spiral

就是这样。困难的部分是如何有效地进行交叉测试，为此我使用了最后一次缓存、分层边界框和四叉树空间索引(所有这些都是您可以通过google了解更多的东西)。

编辑:正如Reto Aebersold指出的，现在有一本书的章节，免费提供，涵盖了同样的领域:美丽的可视化，第3章:Wordle

我已经实现了Jonathan Feinberg所描述的算法，使用python创建了一个标记云。它与wordle.net的美丽云相去甚远，但它让你知道如何做到这一点。

你可以在这里找到这个项目。

I've implemented a word cloud generator called WordCloud.jl in Julia language. A brief description about its algorithm can be found here. Unlike most other implementations, I designed it based on gradient optimization. It’s a non-greedy algorithm in which words can be further moved after they are positioned. Thus the size of the words and the shape and size of the background mask can be kept unchanged in the generation process. This makes the outputs more accurate and easy to customize. Furthermore, we can also generate some fancy outputs like these: Comparison of Obama's and Trump's inaugural address and Wikipedia: Julia

这是一个非常好的javascript代码，来自Jason Davies，它使用了d3。你甚至可以使用web字体。

演示: http://www.jasondavies.com/wordcloud/

Github: https://github.com/jasondavies/d3-cloud