Processing: Creative Coding and Computational Art

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Weight on a Spring, 513, 516 Worm, 509 Yin Yang Fade, 194 Yin Yang, 190 Processing window, 146–158 areas of window explained, 147–150 collapse panes buttons, 150 Edit menu, 152–153 File menu, 150–152 Help menu, 157–158 line number, 147 menus explained, 150–158 message area, 147 resizing entire window, 150 resizing window panes, 150 Sketch menu, 153–154 tabs, 147 text area, 147 text editor, 147 toolbar, 149 Tools menu, 155–157 Processing.org Visit Processing.org command, 158 programming see also coding bytecode, 37 equals vs. assignment, 43 object-oriented programming (OOP), 58, 302–336 procedural programming, 58, 302 programming modes, 162 programming languages dynamically typed languages, 67 high-level language, 31 low-level language, 31 object-oriented type, 32 porting programs, 38 procedural type, 32 Processing as, 30, 31 Processing Language API, 676–743 statically typed languages, 67 universal programming language, 37 programming modes, Processing IDE, 158–162 basic mode, 158 continuous mode, 159–161 Java mode, 162 programming structures arguments, 34 curly braces, 34 variables, 34 programs see Processing programs Progressive Tile sketch, 734 PROJECT constant, 199 properties accessing environmental properties, 678 accessing private property, 319 BurritoRecipe class, 303, 308–309 description, 62, 302, 304 encapsulation, 319 getters and setters, 311 initializing properties in superclass, 322 instance properties, 308, 471 private keyword, 312, 319 properties declaration, 308–309 public properties in Processing, 320 static properties, 308 use of identical keywords for function, 678 using properties from superclass, 322 Prudence, Paul, 23 public interface of class, 391, 394 public keyword, 319 Puff sketch, 137, 139 pushMatrix function altering matrix stack, 714 creating custom 3D cube, 634 Fade-Spin sketch, 409 multiple translations example, 622–624 pushing and popping matrices, 409 single axis 3D rotation, 637 pyramids cube to pyramid to cone to cylinder, 657–662 Cube to Pyramid to Cone to Cylinder sketch, 660 Pythagorean theorem, 752 Q quad function, 354, 355 quadratic curves see also polynomials curves in geometry, 124 generating parabola with, 266 number of turning points in, 124 Processing generating, 125 quadrilaterals Disintegrating Quad Wall sketch, 356 Quad sketch, 355 Random Bounded Quads sketch, 370 Simple/Complex Quads sketch, 371 QUADS mode, beginShape(), 369, 370 number of vertex commands, 371 Random Bounded Quads sketch, 370 QUAD_STRIP mode, beginShape(), 372 questions Frequently Asked Questions command, 158 quotes quotation marks and whitespace, 201 string literals, 64 R Radial Gradient sketch, 427 RadialGradient class, 474–478 radians function, 228, 742 INDEX 803
INDEX 804 radians, converting between degrees and, 758 radicals, relationship with fractional exponents, 750 random function, 34, 742 drawing natural (imperfect) lines, 179–184 doubly randomized particle line, 181 multiple randomized particle lines, 183, 184 randomized point line, 180 grid generated from points, 187 mail merge program, 90 Many Bouncing Balls program, 94 Puff sketch example, 138 randomized particle spray, 181 scribble plotter sketch, 218 Random section, Processing API, 742 randomSeed function, 743 RAPUNSEL project, 20 raster graphics, 115 raster-based approach, 590 Ravenous Ellipse sketch, 502 Ravenous Triangle sketch, 504 Reas, Casey, 5, 8, 21 records beginRecord/endRecord functions, 710 rect function, 97, 101, 112 adding fading to sketch, 492 changing default mode, 693 default origin, 341 drawing 2D rectangle and rotating, 618 drawing modes, 341 transformations, 714 Rectangle method, Java, 112 rectangles see also box function area of, 752 drawing black rectangle, 32 drawing grey rectangle, 33 drawing OOP version of, 35 drawing with OOP sketch, 381 moving on screen, 42 perimeter of, 754 rotation around XYZ axes, 639 rectMode function, 110 arguments, 693 drawing modes, 341, 342 state change, 342 recursion, 347 programming algorithmic tree, 46 red component color data structure, 762 specifying color value, 728 red function, 422, 423, 728 Red Saturation sketch, 442 Redo command, Edit menu, 152 Reference command, Help menu, 158 reference variables, 380, 679 using in House class, 391, 393, 394 reflection, law of, 525–532 registration point, 110 Reichardt, Jasia, 13 relational operators, 73–74 logical flow of programs, 74 Relational Operators section, Processing API, 685 relationships has-a relationship, 324 is-a relationship, 324 releasing mouse mouseReleased function, 567 rendering computer optimization for 3D rendering, 651 how and when for loops render, 486 rendering PImage object to screen, 195 rendering modes, 162–169 argument defining, 618 JAVA2D mode, 162–163 OPENGL mode, 166–169 P2D mode, 162 P3D mode, 164–165 Rendering section, Processing API, 734–736 repaint function, 484 reserved keywords legal names, 65 Structure section, Processing API, 677 resetMatrix function Fade-Spin sketch, 409 resetting affine transformation matrix, 355, 357 resizing windows, 150 resolution of monitor screen, 115 resolution independence, 117 return types, 209 void return type, 209 writing custom functions, 97 return values, 305 Processing functions, 261 RGB (red, green, blue) Color Modes RGB/HSB sketch, 416 Color Picker dialog, 156 colorMode function, 726 right shift (>>) bitwise operation, 728 Roman abacus, 9 Roof class creating a neighborhood, 389 Drawing Some Roofs sketch, 391 using Roof objects in House class, 391, 393, 394 rotate function, 350 affine transformations, 352 creating custom 3D cube, 628 drawing 2D rectangle and rotating, 619 Rotated Triangle sketch, 403 rotateVertices function, 641 rotateX function, 618 rotations 3D rotations, 635–646 drawing 2D rectangle and rotating, 618
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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,
Page 784 and 785: 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:
Page 800 and 801: I’m not going to provide examples
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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: INDEX 802 Hybrid Shape, 366, 368 Hy
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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