Learning Processing: A Beginner's Guide to Programming Images ...

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or /Applications/Processing 0135/ c:/Program Files/Processing 0135/ fi g. 12.1 fi g. 12.2 Th e libraries directory is where you will install contributed libraries. Libraries 197 Inside the libraries directory, you will fi nd folders for each of the built-in libraries, along with a “ howto.txt ” fi le that provides tips and instructions related to making your own library (a topic beyond the scope of this book). See Figure 12.2 . Th e fi rst use of a third party library can be found in Chapter 18 of this book. Th e “ simpleML ” library, designed to make HTML and XML data retrieval simple, is available for download at the book’s web site, http://www.learningprocessing.com/libraries . If you want to get a jump start on Chapter 18, download the fi le simpleML.zip and follow the instructions below, and illustrated in Figure 12.3 . Th e process for installing other contributed libraries will be identical, with the exception of fi lenames. Step 1. Extract the ZIP fi le. Th is can usually be accomplished by double-clicking the fi le or with any decompression application, such as Winzip on a PC.
198 Learning Processing fi g. 12.3 Step 2. Copy the extracted fi les to the Processing libraries folder. Most libraries you download will automatically unpack with the right directory structure. Th e full directory structure should look like this: /Processing 0135/libraries/simpleML/library/simpleML.jar More generically: /Processing 0135/libraries/libraryName/library/libraryName.jar Some libraries may include additional fi les in the “ library ” folder, as well as the source code (which is commonly stored one directory up, in the “ libraryName ” folder). If the library does not automatically unpack itself with the above directory structure, you can manually create these folders (using the fi nder or explorer) and place the libraryName.jar fi le in the appropriate location yourself. Step 3. Restart Processing. If Processing was running while you performed Step 2, you will need to quit Processing and restart it in order for the library to be recognized. Once you have restarted, if everything has gone according to plan, the library will appear under the “ Sketch → Import Library ” option shown in Figure 12.4 . fi g. 12.4 Th e newly installed library will now appear in the list! What to do once you have installed the library really depends on which library you have installed. Examples that make use in code of a contributed library can be found in Chapter 18 (simpleML, Yahoo API) and Chapter 20 (Sonia, Minim).
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Learning Processing A Beginner’s
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Learning Processing A Beginner’s
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Contents Acknowledgments vii Introd
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Acknowledgments In the fall of 2001
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Introduction What is this book? Th
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Introduction xi While both of these
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Introduction xiii Th e book is desi
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Introduction xv Th is book’s web
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Introductory Exercise: Write instru
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Lesson One The Beginning 1 Pixels 2
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1 Pixels “ A journey of a thousan
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1.2 Simple Shapes Pixels 5 Th e vas
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0 1 2 3 4 5 6 7 8 9 fi g. 1.9 top l
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1.3 Pixels 9 Exercise 1-3: Reverse
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Example 1-2: noFill ( ) background(
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fi g. 1.19 Pixels 13 Exercise 1-5:
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colorMode(RGB,100); Pixels 15 Th e
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2 2.1 Processing “ Computers in t
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fi g. 2.2 Once you have opened the
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Let’s write a fi rst example ( se
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Line 9 fi g. 2.6 Processing is case
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fi g. 2.7 Processing 25 Processing
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Example 2-1: Zoog again size(200,20
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Processing 29 To see the applet wor
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3 3.1 Interaction “ Always rememb
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Let’s look at what will surely be
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3.3 Variation with the Mouse Intera
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Draw Zoog's eyes fill(0); ellipse(8
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3.4 Mouse Clicks and Key Presses In
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Draw Zoog's eyes fill(mo useX,0,mou
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Lesson Two Everything You Need to K
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4 4.1 Variables “ All of the book
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4.2 Variable Declaration and Initia
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A variable can also be initialized
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x = 5; x = a + b; x = y - 10 * 20;
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void draw() { // Draw the backgroun
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4.6 Random: Variety is the spice of
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4.7 Example 4-7: Filling variables
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5 5.1 Conditionals Conditionals 59
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Finally, for testing multiple condi
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Conditionals 63 It is worth pointin
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Conditionals 65 Getting into the ha
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Our fi rst instinct might be to wri
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5.5 Multiple Rollovers Conditionals
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Conditionals 71 We can then check t
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5.7 Conditionals 73 Exercise 5-8: E
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Reversing the Polarity of a Number
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One way to solve this problem is to
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Display the square fill(0); noStrok
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6 Loops “ Repetition is the reali
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Loops 83 (see Chapter 5). However,
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while (y < 100) { // Loop! } 3. Wha
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while (x < = endLegs) { line(x,y,x,
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Th e same exact loop can be program
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Loops 91 Th is was a nice simplifi
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6.6 Loop Inside the Main Loop Loops
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6.7 float distance = abs(mouseX - i
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Draw Zoog's legs stroke(0); line(x-
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Lesson Three Organization 7 Functio
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7 7.1 Functions “ When it’s all
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7.2 “ User Defi ned ” Functions
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Example 5-6: Bouncing ball // Decla
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7.5 Functions 107 Exercise 7-3: Tak
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Functions 109 It should be fairly a
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int globalX = 0; int globalY = 100;
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void setup() { println( "a"); funct
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If we did not include a return stat
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7.8 Zoog Reorganization Zoog is now
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void draw() { } background(0); // D
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8 8.1 Objects “ No object is so b
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Setup: Draw: Initialize car color.
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Objects 125 • The Class Name—Th
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Objects 127 One other thing; with t
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fi g. 8.1 fi g. 8.2 fi g. 8.4 fi g.
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Objects 131 Nevertheless, this is q
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void draw() { } background(100); ba
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Objects 135 modular, reusable packa
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Lesson Three Project Step 1. Take y
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Lesson Four More of the Same 9 Arra
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9 Arrays “ I might repeat to myse
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Car myCar80 Car myCar81 Car myCar82
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9.3 Declaring and Creating an Array
Page 166 and 167: 9.4 Initializing an Array One way t
Page 168 and 169: Example 9-5: Using a for loop to in
Page 170 and 171: Arrays 151 Now comes the hard part.
Page 172 and 173: 9.7 Arrays 153 Exercise 9-7: Rewrit
Page 174 and 175: 9.8 Interactive Objects Arrays 155
Page 176 and 177: Check if point is inside of Stripe
Page 178 and 179: alls[i].gravity(); balls[i].move();
Page 180 and 181: Draw Zoog's arms with a for loop fo
Page 182 and 183: Lesson Five Putting It All Together
Page 184 and 185: 10 10.1 Algorithms “ Lather. Rins
Page 186 and 187: Translating the preceding algorithm
Page 188 and 189: void draw() { background(255); stro
Page 190 and 191: Example 10-2: Bouncing ball class c
Page 192 and 193: Now that the function is complete,
Page 194 and 195: 10.6 // Constructor Ball(float temp
Page 196 and 197: Algorithms 177 With the above logic
Page 198 and 199: Drop() { r = 8; // All raindrops ar
Page 200 and 201: Example 10-7: Drops one at a time /
Page 202 and 203: Algorithms 183 Notice how every sin
Page 204 and 205: oolean intersecting = ball1.interse
Page 206 and 207: } void setLocation(float tempX, flo
Page 208 and 209: Algorithms 189 It is important to r
Page 210 and 211: 11 Debugging “ Th e diff erence b
Page 212 and 213: Debugging 193 Once all the code is
Page 214 and 215: 12 Libraries “ If truth is beauty
Page 218 and 219: Lesson Six The World Revolves Aroun
Page 220 and 221: 13 Mathematics Mathematics 201 “
Page 222 and 223: Mathematics 203 Th erefore, modulo
Page 224 and 225: Th e probability of a coin fl ippin
Page 226 and 227: 13.6 Perlin Noise Mathematics 207 O
Page 228 and 229: Mathematics 209 How quickly we incr
Page 230 and 231: It is fairly intuitive for us to th
Page 232 and 233: fi g. 13.9 y-axis sine(theta) � y
Page 234 and 235: Example 13-6: Oscillation float the
Page 236 and 237: Mathematics 217 In 1975, Benoit Man
Page 238 and 239: Mathematics 219 said about recursio
Page 240 and 241: Mathematics 221 A two-dimensional a
Page 242 and 243: Example 13-10: Two-dimensional arra
Page 244 and 245: } void display() { } // FILL IN Mat
Page 246 and 247: 14 14.1 Translation and Rotation (i
Page 248 and 249: Our fi rst instinct might be to add
Page 250 and 251: Example 14-3: A rectangle moving al
Page 252 and 253: When using the OPENGL mode, you mus
Page 254 and 255: Translation and Rotation (in 3D!) 2
Page 256 and 257: 14.5 fill(150,150); vertex(-t, t,-t
Page 258 and 259: 14.6 Example 14-5: Rectangle rotati
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fill(0,100); // Note the use of pus
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14.9 Example 14-17: Nested push and
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stroke(0); fill(175); ellipse(0,0,d
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Lesson Seven Pixels Under a Microsc
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15 Images Images 255 “ Politics w
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And yet: PImage img = loadImage( "f
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15.3 My Very First Image Processing
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Images 261 Even better, if we just
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Images 263 // Create a grayscale co
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Images 265 15.6 Intro to Image Proc
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Images 267 Since we are altering th
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15.9 More on fi lter( ): fi lter(mo
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Images 271 Example 15-13 performs a
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Example 15-14: “ Pointillism ”
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16 16.1 Video “ I have no memory.
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Video 277 Th e above line of code i
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void draw() { // Check to see if a
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16.3 Recorded Video Video 281 Displ
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16.4 Video 283 Exercise 16-3: Using
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Video 285 For every square at colum
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} } // Each rect is colored white w
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16.5 Video as Sensor, Computer Visi
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Now, we are ready to compare the co
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16.6 Video 293 Exercise 16-5: Take
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void setup() { size(320,240); video
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Example 16-13: Simple motion detect
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16.8 // Step 4, compare colors (pre
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Lesson Seven Project Develop a soft
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Lesson Eight The Outside World 17 T
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17 17.1 Text “ I could entertain
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Exercise 17-2: Loop through and pri
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17.3 Displaying Text Text 309 We wi
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println(PFont.list()); For demonstr
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X = �50 fi g. 17.4 float w = text
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Example 17-4: Text mirror import pr
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textFont(f); // Set the font transl
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Exercise 17-9: Using textWidth( ) ,
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Example 17-7: Boxes along a curve P
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Text 323 Exercise 17-10: Create a s
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18 Data Input “ A million monkeys
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Example 18-1: User input PFont f; /
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Data Input 329 Th e reverse of spli
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Example 18-2: Graphing comma separa
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Data Input 333 Th e rollover( ) fun
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18.4 diameter = diameter_; } // Tru
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} // Find the index of the end tag
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void mousePressed() { // Increment
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18.6 for (int i = 0; i < kinglear.l
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Create and make an asynchronous req
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� student � � id � 002 �
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Requests for XML data are made via
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18.8 Using the Processing XML Libra
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XMLElement diameterElement = childr
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Example 18-10: A Yahoo search impor
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However, if you request a URL on a
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19 19.1 Data Streams “ I’m mad
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import processing.net.* ; Server se
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Data Streams 361 Once the server is
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19.4 void draw() { background(255);
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Data Streams 365 must be networked
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Data Streams 367 will send X , Y co
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Data Streams 369 Here is the full S
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Here is the entire client sketch: 1
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Data Streams 373 Serial communicati
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Data Streams 375 of information, ca
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Corresponding Arduino code: int sen
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Lesson Nine Making Noise 20 Sound 2
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20 Sound “ Check. Check. Check 1.
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void setup() { Sonia.start(this); }
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void mousePressed() { // If the use
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Sound 387 check and see if a sound
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Is a point inside the doorbell (use
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Pressing the mouse stops and starts
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20.6 void draw() { background(255,1
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In code, this translates to: // If
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21 Exporting “ Wait a minute. I t
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Th is code can be inserted anywhere
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void setup() { size(400, 400); begi
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Exporting 403 save( ) takes one arg
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Exporting 405 Example 21-5 records
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Lesson Ten Beyond Processing 22 Adv
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22 Advanced Object-Oriented Program
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class Point { float x,y; Point(floa
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Advanced Object-Oriented Programmin
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Advanced Object-Oriented Programmin
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class Circle extends Shape { // inh
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for (int i = 0; i < dogs.length; i
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22.5 Example 22-2: Polymorphism //
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23 23.1 Java “ I l o ve c off ee,
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Java 425 instead of Processing , sp
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fi g. 23.2 Java 427 Just as with th
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Particle p = parray[i]; p.run(); p.
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Hint: Add a function that returns a
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Example 23-4: Super fancy ArrayList
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Java 435 It is sad when these error
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Th e tutorials will cover the same
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Appendix: Common Errors Appendix 43
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Error: No accessible fi eld named
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void draw() { thing.display(); } Co
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Error: Perhaps you wanted the overl
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Index AIFF (Audio Interchange File
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Fill( ) function 10 , 11 , 256 , 30
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One-dimensional Perlin noise 208 OP
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solar system, processing 247-9 vert
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