Processing: Creative Coding and Computational Art

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otation of rectangle around XYZ axes, 639, 641 single axis 3D rotation, 635 Single Axis 3D Rotation sketch, 637 ROUND constant end caps for lines, 199 joining lines using strokeJoin(), 228 round function, 742 rounding converting float to int, 184 ROY G BIV sketch, 417 Rozin, Daniel, 23 Run button, toolbar, 149 Run command, Sketch menu, 154 S sand mandala, 7 saturation function, 422, 423, 728 Save As command, File menu, 152 Save button, toolbar, 149 Save command, File menu, 152 save function, 467, 710 saveBytes function, 710 saveFrame function, 467, 710 saveStrings function, 710 scale function, 352 scatter variable, mouseMoved(), 569 Schmidt, Karsten, 23, 452 Schwartz, Lillian, 15 scope, 305 global scope, 87 initializing properties, 310 local scope, 87 properties, 305 variables, 70, 183, 305 screen images saving screen image data, 710 screen property, 678 screen resolution, monitor, 115 screenX/screenY/screenZ functions, 720 SCRIBBLE constant, 218 scribble function, 215, 218 scribble plotter sketch, 215, 218 searching Find in Reference command, 158 secant lines, 128 second function, 708 seed functions, 743 Select All command, Edit menu, 153 semantics, 58 semicolons in Processing programs, 60 semiconductors, 761 set function creating linear gradient, 424 creating radial gradient, 428 creating wave gradient, 429 Loading Images with set() sketch, 434 set method, PImage, 440 set methods accessing private property, 319 BurritoRecipe class example, 303 Environment section, Processing API, 678 private keyword on properties, 312 Processing approach, 382 setter methods, OOP, 472 setEllipse function, 293 setGradient function, 426 setKnob method, Door class, 382, 384 setParticles function, 261 setRandomStyle function, 140 setSpring function, 513 setters see set methods Setting section, Processing API setup function Bouncing Ball program, 78, 80 continuous mode introducing, 159 Drawing Application example, 593 Many Bouncing Balls program, 94 Neighborhood sketch, 394 shape builder and animator example, 575 writing custom functions, 97, 205 Shape class applying inheritance, 321–323 inheritance in OOP, 302 shape function, 295, 340–378 shape modes, 368–374 Shape section, Processing API, 691–701 shapes applying OOP to shape creation, 378–381 creating hybrid shapes, 365–368 Hybrid Shape sketch, 366, 368 mapping image onto surface of, 699 plotting shapes, 358–365 primitives (primitive shapes), 340 shape builder and animator example, 570 tessellation, 374–378 transforming, 350–358 shapeVertex function, 295 shifting bits (>), 763–767 shininess function, 720 shortcuts keyboard shortcuts for toolbar buttons, 149 assignment operation, 184 shorten function, 682 Show Sketch Folder command, Sketch menu, 154 Shredder, 18 signed bit, 765 silicon, 761 Simon, John F. Jr., 19 SIMPLICITY, 20 simulation see animation sin function creating curves using trig, 256 Drawing Application example, 598 INDEX 805
INDEX 806 Nematode sketch, 411, 413 translating rotations, 535 sine mnemonic for trig functions, 756 sine curve repeating distorted sine curve, 134 repeating sine curve, 132 sine wave phase shift, 756 singletons object singletons, 678 size textSize function, 740 size function argument defining renderer, 618 asteroid shower animation, 548 default rendering mode, 162 setting display size, 177 sketch window, 60, 70 specifying rendering mode, 162 stepped radial gradient program, 70 Sketch menu, Processing window, 153–154 Add File command, 154 commands, 154 Import Library command, 154 Present command, 154 Run command, 154 Show Sketch Folder command, 154 Stop command, 154 sketch window size function, 60, 70 Sketchbook command, File menu, 151 Sketchbook directory, 151 Sketchbook submenu, File menu, 151 sketches see also Processing sketches applet subdirectory, 150 creating new sketch, 149, 151 exporting sketches, 150, 152 as executable application, 152 getting current focus state of, 678 getting online status of, 678 hidden file tabs when compiling, 148 Java graphics programs, 144 naming conventions, 149 naming using illegal characters, 149 naming using invalid suffix, 148 opening directory of current sketch, 154 opening, 149, 151 saving, 149, 152 saving as new sketch, 152 specifying printing options, 152 tabs indicating files in Processing window, 147 sleep method, Thread class, 484 slide rule Pickett circular slide rule, 9 slider Drawing Application example, 593, 602 slope, lines, 123, 243 smooth function anti-aliasing using, 214–219, 698 lines and curves, 245 slightly reducing stroke weight of fine lines, 215 Smooth option Create Font dialog box, 155 smoothness, geometric curves, 126 Sodaplay, 516 soft-body dynamics, 516–520 software development Java Development Kit (JDK), 144 specular function, 720 specularity, 720 speed, 128 speedX/speedY variables, vectors, 521 sphere Interactive Toroid sketch, 667, 669 sphere function coding in 3D, 647, 696 drawing 2D sphere and rotating, 619 sphereDetail function coding in 3D, 696 Interactive Toroid sketch, 669 spinning Spinning 3D Stuff sketch, 697 Triangle Spin sketch, 350 spinning cube coding in 3D, 616 spinning around x- and y-axes, 617 spinning around y-axis, 617 translate function, 618 Spinning Cube sketch, 617 SpinnyCube class create method, 646 rotation of cube around XYZ axes, 642, 645 spinnyRotateXYZ method, 646 spirals spiral built of polygons, 230, 233, 234 TRIANGLE_STRIP Spiral sketch, 374 splice function, 682 spline curve using curve function, 281, 693 spline plot creating elliptical spline plot, 295 split function, 682 springing, 505–511 createSpring function, 513 Hybrid Springy Dude sketch, 518 setSpring function, 513 simulating spring behavior, 511–516 Weight on a Spring sketch, 513, 516 sprockets makeSprocket function, 363 SQUARE constant, 199 stacks, 714
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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
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B MATH REFERENCE
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After multiplying, you can reduce t
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Here’s an example: When dividing,
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Figure B-1. Using a right triangle
Page 786 and 787: Here’s how the process works: pic
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Page 796 and 797: Here’s the output: c1 in binary =
Page 798 and 799: This sketch outputs the following:
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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 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: INDEX 804 radians, converting betwe
Page 839 and 840: INDEX 808 text Orbiting Text sketch
Page 841: INDEX 810 VERY_HIGH option, encrypt
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