什么是 Processing?
Processing 原本是一个基于 Java 的给艺术家用的编程框架，目前发展成了一系列框架合集。当然目前版本依然包含最基本的 Java 版本，而且还添加了 JavaScript 版本(p5.js)、Python 版本等等。
按照官网的描述：
Processing is a flexible software sketchbook and a language for learning how to code. Since 2001, Processing has promoted software literacy within the visual arts and visual literacy within technology. There are tens of thousands of students, artists, designers, researchers, and hobbyists who use Processing for learning and prototyping.