Processing: Creative Coding and Computational Art

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drawing rectangle with OOP sketch, 381 encapsulation, 319–320 extends keyword, 469 final keyword, 470 inheritance, 320–323 Object class, 321 OO approach to color/imaging, 469 OOP inheritance diagram, 320 instances of classes, 302 instantiation, 680 interface to and implementation of functions, 319 interfaces, 326–328 polymorphism with interfaces, 331–336 method overriding, 726 methods of classes, 302 object-oriented approach to color/imaging, 468–478 abstract class declaration, 470 abstract methods, 471 class constants, 470 getter and setter methods, 472 Gradient class, 469 instance properties, 471 LinearGradient class, 472–474 organizing classes using multiple tabs, 478 RadialGradient class, 474–478 object singletons, 678 objects, 33, 378 assigning object reference to extended class, 323 creating objects, 379 polymorphism, 329–331 polymorphism with interfaces, 331–336 procedural OOP (poop) approach, 39–40 Processing and Java, 31 Processing OOP program to draw rectangle, 35 programming language types, 32 properties of classes, 302 static keyword, 470 structuring a program using Processing, 33 this keyword, 473 OPAQUE argument, filter function, 459 Open button, toolbar, 149 Open command Sketchbook submenu, File menu, 151 OPENGL rendering mode, 166–169 box and sphere functions, 696 mapping image onto surface of shape, 699 operations bitwise operations, 729 operator precedence, 72, 121 operators, 72–76 assignment operators, 75–76 shortcut assignment operation, 184 associative/non-associative properties of, 121–122 binary operators, 76 bitwise operators, 443–448, 767–769 concatenation operator (+), 313 conditional operators, 74 logical and operator, 74 logical or operator, 74 decrement operator, 741 increment operator, 741 Logical Operators section, 689 modulus operator, 73, 184, 741 relational operators, 73–74 equal to operator, 73 greater than operators, 73 less than operators, 73 not equal to operator, 73 Relational Operators section, 685 ternary operator, 83 unary operators, 76 Operators section, Processing API, 741 or (logical or) operator, 74, 80 Logical Operators section, 689 OR bitwise operator (|), 768 Orb class asteroid shower animation, 536, 540 Orbiting Text sketch, 740 orbs asteroid shower animation, 535–551 order of transformations example, 620 origin, coordinate system ellipse function, 341 rect function, 341 x and y axis directions, 109 orthogonal collisions, 521, 525 see also non-orthogonal collisions asteroid shower animation, 537, 538 oscillons, analog computers, 14 OTF (OpenType) font vector format, 738 OutOfMemoryError working with large images, 433 Output section, Processing API, 710–712 overloaded method, 628 overloading makePoly function, 362 multiple versions of functions, 100 Window class, 388 overriding, 726 abstract methods, 334 subclasses overriding methods, 331 Overview section Getting Started command, Help menu, 157 P P2D mode, 162 P3D mode, 164–165 argument defining rendering mode, 618 asteroid shower animation, 548, 549 Attributes section functions, 698 box and sphere functions, 696 INDEX 797
INDEX 798 coding in 3D, 616 mapping image onto surface of shape, 699 packages classes and, 321 java.awt.* package, 725 javax.swing.* package, 725 organizing code libraries into, 154 Page Setup command, File menu, 152 paint method, Graphics class, 726 Painting Stripes sketch, 485, 487 paintOutlines function, 159 palettes see color palettes parabola with quadratic curve, 266 parallelogram, area of, 753 param function, 707 parameterized function, 102 parameters arguments and, 209 class constructors, 310 description of use of term, 97 parentheses curly braces { }, 61 operator precedence, 121 parentheses defining functions, 60 properties of operators, 122 parseInt method, Integer class, 707 particle waves, curves as, 260 particles see points Paste command, Edit menu, 153 patterns see also wave patterns Puff sketch, 137, 139 .pde suffix, 147 pencil tool, 591, 598 Penner, Robert, 23 period character dot (.) syntax, 62 Perlin, Ken, 23, 743 persistence of vision, 117 perspective, 719 coding in 3D, 618 P3D mode, 164 Peters, Keith, 23, 532, 552 PFont section, Processing API, 737 PGraphics data type, 734 Photoshop filter, problem with, 5 Physical Language Workshop (PLW), 20 physics, simulating, 492–499 pi, 757 Pickett circular slide rule, 9 pie charts, 270 pie wedge shapes within table structure, 271 PImage data type, 433, 434, 731 arrayCopy function, 446 bitwise operations, 446 blend method, 459, 460 get method, 440 mask method, 448 methods, 440–443 pixels[] array property, 440 rendering object to screen, 195 returning color of PImage, 436 set method, 440 Pitaru, Amit, 23 pixel array mask, 450 Pixel Array Mask sketch, 451 pixel buffer, 113 pixel functions, 429–432 pixel gradients, 424 pixels, 113–115 24-bit color, 113 bits per pixel for color, 400 Color Banding with pixels[] sketch, 431 Color Static sketch, 432 creating lines with pixels, 195–196 description, 109 display window functions, 440 handling pixel and image data, 113 INVERT argument, 453 loadPixels function, 429, 431, 732 performing bitwise operations on color, 763 pixels[] array, 430, 440 points in geometry, 123 registration point, 110 returning color of single pixel, 436 updatePixels function, 431, 732 vector graphics, 116 Pixels array (single white pixel) sketch, 430 Pixels section, Processing API, 732 pixels[] array, 430, 440 pixels[] array property, PImage, 440, 732 Pixilate sketch, 441 platforms porting programs, 38 Platforms section Getting Started command, Help menu, 157 plot function, 262 plotters point recorder/plotter sketch, 211 scribble plotter sketch, 215, 218 plotting shapes, 358–365 using Point class, Java, 346 pmouseX/pmouseY variable, 500 Pockets Full of Memories, 18 Point class, Java, 123 asteroid shower animation, 548 Bézier curve showing anchor/control points, 274 data types, 346 plotting, 346 point function, 242 point of inflection, 266 Point3D class coding toroids in 3D, 663 constructing 3D brick tower, 647
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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
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“Operators” will hopefully soun
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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
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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 and 822: INDEX 790 H haptics, 108 has-a rela
Page 823 and 824: INDEX 792 MouseListener interface,
Page 825 and 826: INDEX 794 M Mac keyboard shortcuts,
Page 827: INDEX 796 classes, 304, 321 constan
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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