Processing入门指南：零基础探索图像编程与交互艺术

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you start out trying to program everything all at once, it will be very hard to nd these bugs. e one-

step-at-a-time methodology, however, allows you to tackle these mistakes one at a time, squishing the

bugs.

In addition, incremental development lends itself really well to object-oriented programming, a core

principle of this book. Objects, which will be introduced in Chapter 8, will help you to develop projects in

modular pieces as well as provide an excellent means for organizing (and sharing) code. Reusability will

also be key. For example, if you have programmed a spaceship for Space Invaders and want to start

working on asteroids, you can grab the parts you need (i.e., the moving spaceship code), and develop the

new pieces around them.

Algorithms

When all is said and done, computer programming is all about writing algorithms. An algorithm is a

sequential list of instructions that solves a particular problem. And the philosophy of incremental

development (which is essentially an algorithm for you, the human being, to follow) is designed to make

it easier for you to write an algorithm that implements your idea.

As an exercise, before you get to Chapter 1, try writing an algorithm for something you do on a daily

basis, such as brushing your teeth. Make sure the instructions seem comically simple (as in, “Move the

toothbrush one centimeter to the left.”)

Imagine that you had to provide instructions on how to accomplish this task to someone entirely

unfamiliar with toothbrushes, toothpaste, and teeth. at is how it is to write a program. A computer is

nothing more than a machine that is brilliant at following precise instructions, but knows nothing about

the world at large. And this is where you begin your journey, your story, your new life as a programmer.

You begin with learning how to talk to your friend, the computer.

Introductionxx

Exercise 1-1: Looking at how I wrote the instruction for line — line(1, 0, 4, 5); — how would you guess you

would write an instruction to draw a rectangle? A circle? A triangle? Write out the instructions in English and then

translate it into code.

English: _________________________________________________________________

Code: _________________________________________________________________

English: _________________________________________________________________

Code: _________________________________________________________________

English: _________________________________________________________________

Code: _________________________________________________________________

Come back later and see how your guesses matched up with how Processing actually works.

1-2 Simple shapes

e vast majority of the programming examples in this book will be visual in nature. You may ultimately

learn to develop interactive games, algorithmic art pieces, animated logo designs, and (insert your own

category here) with Processing, but at its core, each visual program will involve setting pixels. e

simplest way to get started in understanding how this works is to learn to draw primitive shapes. is is

not unlike how you learn to draw in elementary school, only here you do so with code instead of crayons.

I’ll start with the four primitive shapes shown in Figure 1-4.

Figure 1-4

For each shape, ask yourself what information is required to specify the location and size (and later color)

of that shape and learn how Processing expects to receive that information. In each of the diagrams below

(Figure 1-5 through Figure 1-11), assume a window with a width of ten pixels and height of ten pixels.

is isn’t particularly realistic since when you really start coding you will most likely work with much

larger windows (ten by ten pixels is barely a few millimeters of screen space). Nevertheless, for

demonstration purposes, it’s nice to work with smaller numbers in order to present the pixels as they

might appear on graph paper (for now) to better illustrate the inner workings of each line of code.

5Pixels

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Processing入门指南：零基础探索图像编程与交互艺术

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