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

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X = �50 fi g. 17.4 float w = textWidth(headline) ; if (x < -w) { x = width; } Text 313 Example 17-3 is a full example that displays a diff erent headline each time the previous headline leaves the screen. Th e headlines are stored in a String array . Example 17-3: Scrolling headlines // An array of news headlines String[] headlines = { " Processing downloads break downloading record. ", " New study shows computer programming lowers cholesterol. ", } ; PFont f; // Global font variable float x; // Horizontal location int index = 0; void setup() { size(400,200); f = createFont( "Arial",16,true); // Initialize headline offscreen x = width; } void draw() { background(255); fill (0); // Display headline at x location textFont(f,16); textAlign (LEFT ); text(headlines[index],x,180); // Decrement x x = x – 3; X = 0 Some text still on screen! Some text width = 100 pixels fi g. 17.5 // If x is less than the negative width, // then it is off the screen float w = textWidth(headlines[index]); if (x < -w) { x = width; index = (index + 1) % headlines.length; } } X = �100 Some text all the way off screen! If x is less than the negative width, then it is completely off the screen Multiple Strings are stored in an array. A specifi c String from the array is displayed according to the value of the “index” variable. textWidth() is used to calculate the width of the current String. “index“ is incremented when the current String has left the screen in order to display a new String.
314 Learning Processing In addition to textAlign( ) and textWidth( ), Processing also off ers the functions textLeading( ), textMode( ) , and textSize( ) for additional display functionality. Th ese functions are not necessary for the examples covered in this chapter, but you can explore them on your own in the Processing reference. 17.5 Exercise 17-6: Create a stock ticker that loops over and over. As the last stock enters the window, the fi rst stock appears immediately to its right. Text Mosaic Combining what we learned in Chapters 15 and 16 about the pixel array, we can use the pixels of an image to create a mosaic of characters. Th is is an extension of the video mirror code in Chapter 16. (Note that in Example 17-4, new text-related code is in bold.) See Figure 17.6 . fi g. 17.6
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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
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9.4 Initializing an Array One way t
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Example 9-5: Using a for loop to in
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Arrays 151 Now comes the hard part.
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9.7 Arrays 153 Exercise 9-7: Rewrit
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9.8 Interactive Objects Arrays 155
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Check if point is inside of Stripe
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alls[i].gravity(); balls[i].move();
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Draw Zoog's arms with a for loop fo
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Lesson Five Putting It All Together
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10 10.1 Algorithms “ Lather. Rins
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Translating the preceding algorithm
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void draw() { background(255); stro
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Example 10-2: Bouncing ball class c
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Now that the function is complete,
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10.6 // Constructor Ball(float temp
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Algorithms 177 With the above logic
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Drop() { r = 8; // All raindrops ar
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Example 10-7: Drops one at a time /
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Algorithms 183 Notice how every sin
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oolean intersecting = ball1.interse
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} void setLocation(float tempX, flo
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Algorithms 189 It is important to r
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11 Debugging “ Th e diff erence b
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Debugging 193 Once all the code is
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12 Libraries “ If truth is beauty
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or /Applications/Processing 0135/ c
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Lesson Six The World Revolves Aroun
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13 Mathematics Mathematics 201 “
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Mathematics 203 Th erefore, modulo
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Th e probability of a coin fl ippin
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13.6 Perlin Noise Mathematics 207 O
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Mathematics 209 How quickly we incr
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It is fairly intuitive for us to th
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fi g. 13.9 y-axis sine(theta) � y
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Example 13-6: Oscillation float the
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Mathematics 217 In 1975, Benoit Man
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Mathematics 219 said about recursio
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Mathematics 221 A two-dimensional a
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Example 13-10: Two-dimensional arra
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} void display() { } // FILL IN Mat
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14 14.1 Translation and Rotation (i
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Our fi rst instinct might be to add
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Example 14-3: A rectangle moving al
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When using the OPENGL mode, you mus
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Translation and Rotation (in 3D!) 2
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14.5 fill(150,150); vertex(-t, t,-t
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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
Page 282 and 283: Images 263 // Create a grayscale co
Page 284 and 285: Images 265 15.6 Intro to Image Proc
Page 286 and 287: Images 267 Since we are altering th
Page 288 and 289: 15.9 More on fi lter( ): fi lter(mo
Page 290 and 291: Images 271 Example 15-13 performs a
Page 292 and 293: Example 15-14: “ Pointillism ”
Page 294 and 295: 16 16.1 Video “ I have no memory.
Page 296 and 297: Video 277 Th e above line of code i
Page 298 and 299: void draw() { // Check to see if a
Page 300 and 301: 16.3 Recorded Video Video 281 Displ
Page 302 and 303: 16.4 Video 283 Exercise 16-3: Using
Page 304 and 305: Video 285 For every square at colum
Page 306 and 307: } } // Each rect is colored white w
Page 308 and 309: 16.5 Video as Sensor, Computer Visi
Page 310 and 311: Now, we are ready to compare the co
Page 312 and 313: 16.6 Video 293 Exercise 16-5: Take
Page 314 and 315: void setup() { size(320,240); video
Page 316 and 317: Example 16-13: Simple motion detect
Page 318 and 319: 16.8 // Step 4, compare colors (pre
Page 320 and 321: Lesson Seven Project Develop a soft
Page 322 and 323: Lesson Eight The Outside World 17 T
Page 324 and 325: 17 17.1 Text “ I could entertain
Page 326 and 327: Exercise 17-2: Loop through and pri
Page 328 and 329: 17.3 Displaying Text Text 309 We wi
Page 330 and 331: println(PFont.list()); For demonstr
Page 334 and 335: Example 17-4: Text mirror import pr
Page 336 and 337: textFont(f); // Set the font transl
Page 338 and 339: Exercise 17-9: Using textWidth( ) ,
Page 340 and 341: Example 17-7: Boxes along a curve P
Page 342 and 343: Text 323 Exercise 17-10: Create a s
Page 344 and 345: 18 Data Input “ A million monkeys
Page 346 and 347: Example 18-1: User input PFont f; /
Page 348 and 349: Data Input 329 Th e reverse of spli
Page 350 and 351: Example 18-2: Graphing comma separa
Page 352 and 353: Data Input 333 Th e rollover( ) fun
Page 354 and 355: 18.4 diameter = diameter_; } // Tru
Page 356 and 357: } // Find the index of the end tag
Page 358 and 359: void mousePressed() { // Increment
Page 360 and 361: 18.6 for (int i = 0; i < kinglear.l
Page 362 and 363: Create and make an asynchronous req
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Page 366 and 367: Requests for XML data are made via
Page 368 and 369: 18.8 Using the Processing XML Libra
Page 370 and 371: XMLElement diameterElement = childr
Page 372 and 373: Example 18-10: A Yahoo search impor
Page 374 and 375: However, if you request a URL on a
Page 376 and 377: 19 19.1 Data Streams “ I’m mad
Page 378 and 379: import processing.net.* ; Server se
Page 380 and 381: 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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