Processing: Creative Coding and Computational Art

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loadImage function, 433, 732, 733 Loading & Displaying (image) section, 733 loading images, 432 Loading Images with set() sketch, 434 mapping image onto surface of shape, 699 PImage data type, 731 PImage methods, 440–443 pixels, 113–115 printing images, 115 Processing image types, 432 refresh rate, 111 vector graphics, 116 working with large images, 433 imaging, 423–478 bitwise operations, 443–448 gradients, 424–429 imaging filters, 448–467 object-oriented approach to, 468–478 saving files, 467 implements keyword, 327 multiple inheritance of interface, 332 Import Library command, Sketch menu, 154 in-betweens, animation, 118 Integer class, Java parseInt method, 707 incidenceVectorX variable, 531 incidenceVectorY variable, 531 increment operator, 741 indentation in code, creating, 62 index.html file applet subdirectory, 150 indexed color, 114 infinite loops, 86 recursion, 347 inheritance, OOP, 320–323 applying inheritance, 321–323 assigning object reference to extended class, 323 extends keyword, 322 initializing properties in superclass, 322 introduction, 302 is-a relationship, 324 multiple inheritance, 326 multiple inheritance of interface, 326, 331 Object class, 321 object-oriented approach to color/imaging, 469 OOP inheritance diagram, 320 super keyword, 322 using properties from superclasses, 322 initializing variables, 66 Input section, Processing API, 702–709 instance properties, OOP object-oriented approach to color/imaging, 471 properties declaration, 308 static properties compared, 308 instance variables this keyword, 384 instances of classes see objects instantiation, OOP, 680 creating Door object, 386 int data type, 65 memory allocation for, 66 rounding on converting float to int, 184 using float type to return float, 179, 662 int function, 428 bug in using, 681 integers converting strings to integers, 707 interactivity, 139–141, 564–613 adding interface elements, 579–590 code art, 564 creating drawing application, 590–603 event detection, 139 event handling, 140 interactivity simplified by Processing, 564–565 keyboard events, 603–611 mouse events, 565–590 interfaces, 326–328 see also GUIs adding interface elements, 579–590 data types and, 331 description, 326 implements keyword, 327 interacting with classes, 302 interface to and implementation of functions, 319 multiple inheritance of, 326, 331 polymorphism with interfaces, 331–336 Processing application interface, 146 public interfaces, 302 reasons for using, 328 interpolation, 420 INVERT argument, filter function, 452, 454 INVERT Filter sketch, 452 is not equal to (!=) expression, 313 is-a relationship, 324 isInitialNode function, 577, 578 Iteration section, Processing API, 685 J JAR (Java Archive) file, 150 Java appending data to array, 683 bytecode, 145 Collections framework, 39 cross-platform functionality, 144 equals method, 681 exception handling, 378 final keyword, 199 history of, 36–39 how Java works, 37 interactivity simplified by Processing, 564 jikes compiler, 145 INDEX 791
INDEX 792 MouseListener interface, 564, 565 multiple inheritance of interface, 326, 331 outline of language processes, 31 paint method, 726 parseInt method, 707 polymorphism in, 329 Processing and, 31, 38 Rectangle method, 112 static keyword, 383 Java applets, 37, 38 see also applets Java classes see also classes AffineTransform, 352 ArrayList, 682 Arrays, 682 BufferedImage, 112 DisplayMode, 111 Event, 140 Graphics, 726 Integer, 707 MouseAdapter, 565 Point, 123 Vector, 682 Java Development Kit (JDK), 144 Java file, applet subdirectory, 150 Java graphics programs see sketches Java mode programming modes, Processing IDE, 162 public properties in Processing, 320 Java runtime environment (JRE), 144 .java suffix, 148 Java Virtual Machine see JVM java.awt.* package, 725 JAVA2D mode, 162–163 javax.swing.* package, 725 jikes compiler, 37, 145 jitter variable, mouseMoved function, 569 JOGL, 166 join function, 682 just-in-time compilers, 38 JVM (Java Virtual Machine) browsers running Java applets, 150 bytecode, 145 event handling, 140 how Processing IDE works, 144 polymorphism in Java/Processing, 329 processing bytecode, 37 K keyboard events, 139, 603–611 detecting key presses and releases, 603 key event detection, 605 Keyboard section, Processing API, 705 keyboard shortcuts, 149 keyCode property, keyboard events, 604 keyframes, animation, 118 keyframing model, 482 keyPressed function, 603, 604 key detection code, 705 motion painting application, 610 keyPressed variable, 605 keyReleased function, 603 keystroke events see keyboard events keywords abstract, 333 boolean, 577 class, 304 double, 309 else, 689 extends, 322 final, 199, 308, 470 float, 309 if, 79 implements, 327 new, 84, 309 null, 313 private, 312, 319 public, 319 reserved keywords, 65 static, 308, 470 super, 322 this, 311, 473 true, 86 use of identical keywords for function and property, 678 void, 99, 305 while, 86 Klima, John, 23 Klingemann, Mario, 23, 452 Kolam art, 7 Kurzweil, Ray, 16 L languages see programming languages Laposky, Ben, 14 lathing coding toroids in 3D, 663 law of conservation of momentum, 555 law of reflection, 525–532 leading textLeading function, 740 Leavitt, Ruth, 23 Legrady, George, 18 lerp function, 420 LerpColor and BlendColor sketch, 730 lerpColor function, 420, 422, 729 lerpColor sketch, 421 less than operators, 73 Levin, Golan, 23 libraries organizing code libraries into packages, 154 Processing GUI libraries, 590
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IrA GreenberG CreATe CoDe ArT, vIsu
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Processing: Creative Coding and Com
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CONTENTS AT A GLANCE Foreword . . .
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CONTENTS Foreword . . . . . . . . .
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CONTENTS viii The joy of math . . .
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CONTENTS x Applying OOP to shape cr
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CONTENTS xii Environment . . . . .
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FOREWORD If you are like me (and th
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ABOUT THE AUTHOR With an eclectic b
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ACKNOWLEDGMENTS I am very fortunate
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INTRODUCTION Welcome to Processing:
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INTRODUCTION xxii Intended audience
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INTRODUCTION xxiv Setting up Proces
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INTRODUCTION xxvi Hopefully by now
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INTRODUCTION xxviii Figure 3. Scree
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INTRODUCTION xxx New or changed cod
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1 CODE ART
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The problem with a Photoshop filter
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Figure 1-3. Example of ancient art
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then jump 400 years to 1614 and Joh
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fertile imagination remained intact
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As an aside, it’s worth observing
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John Whitney Sr., 1918-1995 John Wh
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algorithms. To learn more about Coh
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landfill/), and Feed (www.potatolan
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periodicals such as Art Journal, Wi
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And many more . . . While I have in
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2 CREATIVE CODING
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I think what was reinforced for me
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customized commands, and run loops.
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of code that work like processing m
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introduced to become larger, more c
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Without getting too geeky, the main
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A framework is just a concept for b
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algorithm in a math class in high s
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frame. The loop keeps running and k
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the time to play at whatever level
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} pts[counter2].y-yg); xg*=-1; coun
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The overall movement was good, but
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Obviously, there are a lot of thing
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} } // generates organic looking br
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3 CODE GRAMMAR 101
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Your first program In most programm
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message comes up on the bar in the
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Since the getBreed() method would r
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Variables Variables are essential t
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It’s because strict typing helps
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Stage 3 adds the gradient: /* title
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Next, I assign values to some primi
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In the first preceding example, add
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Assignment operators The only other
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* title: Bouncing Ball description:
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Animation is a perfect example of t
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if (hunger= starving) { eatAnything
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Ternary operator The last condition
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The items array has 50 places reser
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println(x); x += 1; } while(x
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Figure 3-4. Continuous radial gradi
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int ballCount = 500; int ballSize =
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Hopefully, you were able to success
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function call above*/ // fill(i*255
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If you run this, you should see a 1
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yspeed*=-1; } } Within the draw() f
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void checkCollisions(int xp, int yp
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createRect(50, 50, 100, 100, 20, 5,
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4 COMPUTER GRAPHICS, THE FUN, EASY
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Some of the reasons coding graphics
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When working in a 3D coordinate sys
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plotted, the vertices are connected
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eally shines. And remember, as you
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need to be stored in memory, and th
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Within each of these application ar
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don’t realize you’re doing it
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Geometry Like algebra, geometry dat
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(second-degree) curve has one turni
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or possibly even a complete crash o
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This linear motion would plot as a
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and began doubling. By step 80, the
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*Simple Repeating Wave Pattern Ira
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float waveGap = 10; float frequency
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a piece of paper and do a little mo
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Interactivity Figure 4-13. Puff Peo
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Events will be covered and implemen
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PROCESSING: CREATIVE CODING AND COM
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6 LINES
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Figure 6-2. Two-point sketch Adding
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Streamlining the sketch with a whil
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type into the sketch. Although the
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Figure 6-7. Randomized particle spr
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Figure 6-9. Multiple randomized par
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Coding a grid To begin, I’ll show
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Notice that you can make the value
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float steps = totalPts+1; int total
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Creating space through fades Your l
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for (int j=0; j
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Figure 6-19. Yin Yang Fade sketch,
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coordinates of the line. For exampl
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Figure 6-24. End cap variation exam
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Figure 6-25. Auto Layout sketch Thi
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int xPadding = 150; int yPadding =
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Figure 6-27. Table Layout II sketch
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for (int i=0; i
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This is the same drawTable() functi
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easy. The benefit of internally rec
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I call my custom function makeRect(
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As you might suspect, anti-aliasing
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call scribble function strokeWeight
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else { } // extra line needed to at
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smooth(); float x = random(width);
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Figure 6-36. Concentric Maze sketch
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void setup(){ //these values can be
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Create a Triangle size(400, 400); b
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Figure 6-39. Create 3 Triangles ske
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Poly Pattern I (table structure) /*
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Poly Pattern II (spiral) /* Poly Pa
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Poly Pattern III (polystar) /* Poly
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Figure 6-46. Poly Pattern III (poly
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7 CURVES
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size(200, 200); background(255); in
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You should notice some familiar str
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int margin = height/15; strokeWeigh
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Figure 7-8. Revealing the points ma
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* Curves II Ira Greenberg, December
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lower particle speed ySpeed[i]*=gra
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Figure 7-11. Curves simulating a fo
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Figure 7-13. Damping effect on curv
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particle style strokeWeight(strokeS
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By using functions to organize a pr
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for (int i=0; i
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Figure 7-18. Generating a curve wit
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float x = 0, y = 0; int loopLimit =
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concentric circles size(200, 200);
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Pie charts, although valuable as vi
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curve() and bezier() The next two P
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Next is an interactive example that
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Figure 7-27. Interpolating a Bézie
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ezier(350, 100, 400, 150, 350, 250,
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Figure 7-30. Spline curve using Pro
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curve segments noFill(); // comment
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control handles fill(255); ellipse(
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Figure 7-32. bezier() vs. bezierVer
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curveVertex(92+x, 15); curveVertex(
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strokeWeight(.75); stroke(0); rectM
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Figure 7-35. Bézier Ellipse sketch
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I included one last example (shown
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curveTightness(tightness); beginSha
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Summary Curves, and the math behind
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10 COLOR AND IMAGING
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left squares fill(255, 120, 0); rec
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the color. Up to this point in the
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} radius*=ratio; ratio-=.1; } } els
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Figure 10-4. Alpha sketch In this e
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A quick review of creating transfor
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* Nematode - stage 1 Ira Greenberg,
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Figure 10-8. Nematode sketch (stage
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Figure 10-9. Finished Nematode sket
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the decreasing wavelengths of the i
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values, just to illustrate the poss
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lerpColor() uses the same approach
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I want to mention two final points
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column for (int i=x; i
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needs to be increased, as radius in
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Figure 10-19. Wave Gradient sketch
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for (int i=0; i
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Figure 10-23. Load an Image sketch
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The image() function has an extra f
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In the last example, I created an a
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Figure 10-27. Simple Image Encrypti
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Figure 10-28. Pixilate sketch The n
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Figure 10-30. Tint sketch Speeding
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* Tint (using bitwise operations) C
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the book that a primitive type is d
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The mask works like an alpha channe
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ect(random(width), random(height),
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This last sketch couldn’t be simp
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separate out and invert component c
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Figure 10-39. GRAY Filter sketch Th
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adius is set high, the blurring can
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lend() PImage Method sketch // both
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Figure 10-45. blend() Function with
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The next sketch utilizes some for l
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In the last example, I used Process
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Inheritance In OOP, inheritance des
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AXIS_VERTICAL from outside the Grad
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y axis if(axis == AXIS_VERTICAL){ f
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calculate differences between color
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c7 = color(0); c8 = color(255); r1
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In the “Imaging” section, you d
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12 INTERACTIVITY
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} public void mouseClicked(MouseEve
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void setup(){ size(400, 400); // in
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initialize x, y x = width/2.0; y =
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float friction = .85; float[]jitter
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nodeYPos = append(nodeYPos, mouseY)
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As usual, I declare global variable
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are filled with black. Using the in
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} } } } } // bottom display window
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color btnUpState = color(200, 200,
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float xSpeed = 0; color movingSquar
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xSpeed-=.2; btn1Background = btnDow
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mouse trails if (isTrailable){ fill
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isTrailsSelected, which changes the
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shapes. The following example, in s
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set initial button background color
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also makes the code a little harder
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stroke(200); rect(eraserBtn[0], era
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} sliderValue = (sliderHandle[0]-sl
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if (!isBrushSelected){ if (mouseX>b
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selection can be active at a time.
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ectBackground = color(255, 0, 0); }
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is smaller (vertically) than the en
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keys 2-8 control number of edges fo
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strokeWeight(strokeWt); float angle
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Summary We began this chapter compa
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A PROCESSING LANGUAGE API
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http://processing.org/. My main obj
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its binary equivalent. I used some
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part of the article as well. My sug
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Example 1: A Java approach void set
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The combination of these two struct
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Example 3: Creating a honeycomb gra
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Conditionals Conditionals and the r
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Shape // top and bottom boundaries
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You’ll notice that by default, th
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start dragging if flag true for (in
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pushMatrix(); rotateY(-frameCount*P
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egular polygon size(400, 400); smoo
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texture(images[3]); vertex(w, -h/2,
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lots of arrays float[]x = new float
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Keyboard Figure A-9. Box Springs sk
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entering CMD). When using a command
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hour hand strokeWeight(2); stroke(5
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In the next example, I use beginRec
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Transformations include moving, sca
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float ang; int rows = 20; int cols
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vertex(-w/2 + shiftX, -h/2 + shiftY
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Lights The Lights section includes
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system, you can try lowering the re
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ankAngle+=bankSpeed; vert = -600 +z
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Setting The Setting section include
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ellipseMode(CORNER); fill(200, 200,
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of this part of the API. These myst
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Image The Image section relates ver
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Loading & Displaying The Loading &
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these elements is the creation of a
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Typography Processing utilizes mult
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This will output a list of all the
Page 772 and 773: “Operators” will hopefully soun
Page 774 and 775: The noise() function is an advanced
Page 778 and 779: B MATH REFERENCE
Page 780 and 781: After multiplying, you can reduce t
Page 782 and 783: Here’s an example: When dividing,
Page 784 and 785: Figure B-1. Using a right triangle
Page 786 and 787: Here’s how the process works: pic
Page 788 and 789: In Figure B-5, the point p is at 45
Page 790 and 791: ect (px, py, 5, 5); stroke(100); li
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Page 794 and 795: the number, as shown in the followi
Page 796 and 797: Here’s the output: c1 in binary =
Page 798 and 799: This sketch outputs the following:
Page 800 and 801: I’m not going to provide examples
Page 802 and 803: simple-looking paint bucket tool in
Page 804: Figure B-7. Color variations filter
Page 807 and 808: INDEX 776 SYMBOLS AND NUMERICS /* a
Page 809 and 810: INDEX 778 beginShape function, 209
Page 811 and 812: INDEX 780 clipping planes, frustum,
Page 813 and 814: INDEX 782 naming conventions/rules,
Page 815 and 816: INDEX 784 functions, 440 loadPixels
Page 817 and 818: INDEX 786 filter function, 452-459
Page 819 and 820: INDEX 788 minute, 708 modelX/modelY
Page 821: INDEX 790 H haptics, 108 has-a rela
Page 825 and 826: INDEX 794 M Mac keyboard shortcuts,
Page 827 and 828: INDEX 796 classes, 304, 321 constan
Page 829 and 830: INDEX 798 coding in 3D, 616 mapping
Page 831 and 832: INDEX 800 procedures see functions
Page 833 and 834: INDEX 802 Hybrid Shape, 366, 368 Hy
Page 835 and 836: INDEX 804 radians, converting betwe
Page 837 and 838: INDEX 806 Nematode sketch, 411, 413
Page 839 and 840: INDEX 808 text Orbiting Text sketch
Page 841: INDEX 810 VERY_HIGH option, encrypt
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