掌握编程基础：Processing语言引导的艺术与技术之旅

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"《编程101：2018年编程入门的原理与实践》是一本旨在帮助初学者理解编程重要性的指南，由Jeanine Meyer编著。本书采用Processing编程语言作为教学工具，引导读者从零开始掌握基本编程技能。作者将编程过程比作创作艺术作品，如写文章或作曲，强调了从构思、计划到实际构建和精进的过程，强调逻辑和数学在生成视觉效果中的运用。书中内容丰富多样，涵盖了一系列实用项目，包括制作游戏（如蛇游戏、猜词游戏和拼图游戏）、制作家庭照片和视频剪辑拼贴、设计折纸模型折叠步骤、3D物体旋转演示等，这些都让学习者能够看到编程的实际应用和互动性，而不只是静态代码。通过Processing，读者可以创建动态的动画、视频融合、音频处理以及与本地电脑和网络文件的交互。本书特别适合那些对编程感兴趣但缺乏动力的人，或者已经尝试过编程但希望提升技能的人。学习内容包括基础编程技巧的获取、有趣创意项目的构建，以及如何利用文件功能制作节日贺卡。通过《编程101》，读者将亲身体验到从无到有创造程序的满足感，无论是修复现有程序、添加新功能还是改进现有功能。该书具有ISBN-13纸质版（978-1-4842-3696-3）和电子版（978-1-4842-3697-0），并在2018年获得了美国国会图书馆的版权登记。版权信息明确指出，所有内容受版权保护，未经许可不得复制、改编或以任何形式进行传播，包括但不限于电子适应、计算机软件或类似技术方法。书中还提及了商标使用的规定，表明书中可能会包含已注册商标的品牌名、标志和图像，但作者在编辑时仅以非商标方式提及，以尊重知识产权。《编程101：The How and Why of Programming Revealed Using the Processing Programming Language》是读者进入编程世界的一扇大门，带领他们踏上创造之路。"

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xvii

Acknowledgments

Much appreciation to the subjects of the illustrations in this book, starting with my father

(Joseph), and including my mother (Esther), Aviva, Grant, Liam, and especially Annika.

Thanks to my children, Aviva and Daniel, for the photography, video and computer

graphics work.

My students, teaching assistants, and colleagues always provide ideas, stimulation,

feedback, and advice. Thanks especially to Irina Shablinsky for her efforts teaching me

Processing, how to teach Processing, and introducing me to Takashi Mukoda. Thanks to

David Jameson, whose comments and concerns made me produce the Under the Covers

section for each chapter.

Thanks to the crew at Apress/Springer Nature, including Louise Corrigan, Nancy

Chen, James Markham, and others I do not know by name. Much appreciation to the

technical reviewers, Massimo Nardone and Takashi Mukoda.

xix

Introduction

Processing is a programming language built on top of another programming language

called Java. To quote from the https://processing.org page, “Processing is a flexible

software sketchbook and a language for learning how to code within the context of the

visual arts.” The term for a program in Processing is sketch. However, Processing can be

used to create applications that are far more than static sketches. You can use Processing

to create dynamic, interactive programs. It is a great tool for learning programming.

The ten chapters in this book share a common design and structure. My goal is to

introduce you to programming, focusing on the Processing language. In each chapter,

I explain general programming concepts and specific Processing features through the

use of one or more specific examples. The code, along with files such as image files, are

combined as zip files and available https://github.com/Apress/programming-101.

I hope the examples are entertaining; the goal, however, is not for you to learn the

specific examples, but instead understand the concepts and features.

The introduction to each chapter starts with a brief description of the concepts

and programming features used and the examples, then you need to be patient while

I provide background. Each chapter includes a discussion of general “Programming

Concepts” prior to plunging into the details. These are not limited to the Processing

language, but are present in most programming languages. Presenting the concepts in a

general way might help you if you are coming to this book knowing another language OR

you hope to move on to another language someday.

Next, I describe the “Processing Programming Features” that are used to realize

those concepts and produce the examples. This section will have actual code in it and

maybe short examples.

A section called “Under the Covers” describes what Processing is doing for us behind

the scenes and the relationship between Processing and Java. This section appears

in different places in each chapter. It might be of more interest for readers who know

something about Java, but I urge everyone to give it at least a quick scan.

I then provide an overview of each example, with screen shots showing the operation

of the program. Please note that in some cases, I have modified the programs to obtain

the screen shots. I then go on to describe the implementation of the example, which

contains a “Planning” and a “Program” section. The “Planning” section is where I

describe my thought process. Programs do not spring into existence—at least for

me—not like Mozart composing a symphony, which was said to emerge all at once from

his mind. It is an iterative process for most of us. This section contains a table indicating

the relationship of the functions. The “Program” section includes a table with one

column for code and another column with an explanation of that line of code. These

tables are long and are not meant to be read as poetry or fine literature. Instead, skip

around. Use the function relationship table. If you download the code and try it out, you

can use this section to improve your understanding of the program. The most critical

step is to make changes, and I provide suggestions in the “How to Make This Your Own”

section. This set of sections is repeated for each example.

A section titled “Things to Look Up” will contain a list of Processing features related

to the ones described in the chapter. Processing is a large language and it is growing. I

can show you only a small subset of the features and each feature is used in one way,

perhaps using default values. You can and should consult other references to learn

more. You can look things up in multiple ways. For example, you can go to the web

site at https://processing.org/reference/ and just keep that open. Alternatively, if

you want to look up how to draw a rectangle in Processing, it can be efficient to enter

“processing.org rectangle” into Google (or another search engine) or the address field of

browsers such as Chrome to retrieve a list of possible sites. It is best to use “processing.

org” because processing is a common English word. You can try “Processing rectangle,”

but you will need to skip over some sites that have nothing to do with the Processing

language.

Remember that the goal of this chapter is not to teach you how to make my

examples, from peanut-shaped bald men to certain games to rotating 3D cubes, but to

help you understand how to make your own programs! Make small changes and then

large changes. Make your own programs! Chapters will close with two more sections: a

brief review, “What You Learned,” and “What’s Next.”

The book also has an Appendix describing what is called ProcessingJS.This is a way

to publish most types of Processing sketches on the Web. It also makes use of examples.

You are welcome to look at the chapters in any order but later examples do depend

on an understanding of concepts introduced earlier. Moreover, because one of the

main techniques of programming is to reuse code, there are many instances of later

examples copying parts of earlier examples. Do not be concerned: The tables in the

inTRoduCTion

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