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

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Lesson Three Project Step 1. Take your Lesson Two Project and reorganize the code using functions. Step 2. Reorganize the code one step further using a class and an object variable. Step 3. Add arguments to the Constructor of your class and try making two or three objects with diff erent variables. Use the space provided below to sketch designs, notes, and pseudocode for your project. Objects 137
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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
Page 106 and 107: while (x < = endLegs) { line(x,y,x,
Page 108 and 109: Th e same exact loop can be program
Page 110 and 111: Loops 91 Th is was a nice simplifi
Page 112 and 113: 6.6 Loop Inside the Main Loop Loops
Page 114 and 115: 6.7 float distance = abs(mouseX - i
Page 116 and 117: Draw Zoog's legs stroke(0); line(x-
Page 118 and 119: Lesson Three Organization 7 Functio
Page 120 and 121: 7 7.1 Functions “ When it’s all
Page 122 and 123: 7.2 “ User Defi ned ” Functions
Page 124 and 125: Example 5-6: Bouncing ball // Decla
Page 126 and 127: 7.5 Functions 107 Exercise 7-3: Tak
Page 128 and 129: Functions 109 It should be fairly a
Page 130 and 131: int globalX = 0; int globalY = 100;
Page 132 and 133: void setup() { println( "a"); funct
Page 134 and 135: If we did not include a return stat
Page 136 and 137: 7.8 Zoog Reorganization Zoog is now
Page 138 and 139: void draw() { } background(0); // D
Page 140 and 141: 8 8.1 Objects “ No object is so b
Page 142 and 143: Setup: Draw: Initialize car color.
Page 144 and 145: Objects 125 • The Class Name—Th
Page 146 and 147: Objects 127 One other thing; with t
Page 148 and 149: fi g. 8.1 fi g. 8.2 fi g. 8.4 fi g.
Page 150 and 151: Objects 131 Nevertheless, this is q
Page 152 and 153: void draw() { } background(100); ba
Page 154 and 155: Objects 135 modular, reusable packa
Page 158 and 159: Lesson Four More of the Same 9 Arra
Page 160 and 161: 9 Arrays “ I might repeat to myse
Page 162 and 163: Car myCar80 Car myCar81 Car myCar82
Page 164 and 165: 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
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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
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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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