Processing: Creative Coding and Computational Art

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creating custom 3D cube, 625–626 cube to pyramid to cone to cylinder, 657 rotation of cube around XYZ axes, 642 pointers reference variables, 679 points, 174–176 calculating columns based on number of, 179 changing color of, 174 coding a grid, 185 grid generated from points, 187 grid with spaced-out points, 188 curve created from, 247 drawing natural (imperfect) lines, 179–184 doubly randomized particle line, 181 multiple randomized particle lines, 183 randomized point line, 180 fades creating space, 191–195 multiple points in line sketch, 176 using for loop, 178–179 using while loop, 177–178 point recorder/plotter sketch, 211 points considered as lines, 174 points in geometry, 123 randomized particle spray, 181 single-point sketch, 174 three point sketch, 175 two point sketch, 175 vertex function, 209–214 vertical lines generated from, 185 POINTS mode, 210 polar coordinate system converting from polar to Cartesian, 228 measuring angles with radians, 757 unit circle, 228 polling event detection, 139 Polygon class applying inheritance, 321–323 polygons area of non-intersecting polygon, 754 generating polygon sketch, 162 generating regular polygon, 647 makePoly function, 230, 359 plotting shapes, 358, 359 polygon creation sketch, 229 Polygon Creator sketch, 362 polygon with second radius (polystar), 230, 235, 237 polygonal table structure, 230, 232 rotating concentric 3D polygons sketch, 164 simple and complex polygons, 370 spiral built of, 230, 233, 234 polyhedrons Interactive Toroid sketch, 669 polymorphism, OOP, 329–331 with interfaces, 331–336 polynomials see also quadratic curves cubic curve, 266 first-degree polynomial, 262 generating curves using, 262–267 plot of cubic curve, 267 second-degree polynomial, 263, 264, 265 third- and higher-degree polynomial, 266 polystar polygon with second radius, 230, 235, 237 popMatrix 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 Population Explosion sketch, 691 porting programs, 38 POSTERIZE argument, filter function, 458 POSTERIZE Filter sketch, 458 pow function, 265 precedence of operators, 72 Present command, Sketch menu, 154 primitive data types, 679 Primitive section, Processing API, 679 primitive variables, 65–72, 380, 679 primitives (primitive shapes), 340 2D Primitives section, 692 3D Primitives section, 696 Print command, File menu, 152 print function, 710 argument type, 61 debugging code, 61 mail merge program, 90 printing, 152 printing images offset printers, 115 println function, 61, 710 debugging, 81, 426 mail merge program, 90 newline escape sequence, 380 printMatrix function, 357 printRecipe method, 312 private keyword accessing private property, 319 changing property values, 312 data hiding, 319 procedural languages functions, 32, 62 procedural OOP (poop) approach, 39–40 procedural programming, 58 Processing and Java, 31 programming language types, 32 procedural programming, 302 structuring a program using Processing, 33 INDEX 799
INDEX 800 procedures see functions Processing 3D rotations, 635–646 affine transformations, 352 approach to get and set methods, 382 as programming language, 31 bytecode, 145 coding in 3D, 616–672 color functions in Processing, 419–423 creating classes, 379 curve functions, 267–298 default frame rate, 538 downloading, 59 drawing methods, 112 events and interactivity, 564–613 exception handling, 378 explicitly setting registration point, 110 filters and blends, 448–467 framework described, 39 graphics, 108–141 GUI libraries, 590 handling huge files, 433 how Processing works, 144–146 image manipulation, 432–443 image types, 432 imaging, 423–478 imaging filters, 448–467 interactivity simplified by Processing, 564–565 Java and, 31, 38 Java applet and, 37 keyboard events, 603–611 libraries of classes, 303 lines, 174–237 mouse events, 565–590 multimode capability, 144 multiple inheritance of interface, 326, 331 object-oriented approach to color/imaging, 468–478 origin of Processing, 30 outline of language processes, 31 PImage data type, 731 polymorphism in, 329 Processing window, 146–158 programming modes, 158–162 public/private properties, 320 reasons to use for animation, 119 rendering modes, 162–169 saving files, 467 scope, 305 setting display size, 177 shape functions, 340–378 structuring a program using, 33 targeting properties, 312 type and anti-aliasing, 215 using classes in, 317 VLW format, 737 x and y axis directions, 109 Processing API, 676–743 2D Primitives section, 692 3D Primitives section, 696 Array Functions section, 682 Attributes (shape) section, 698 Attributes (typography) section, 740 Bitwise Operators section, 741 Calculation section, 741 Camera section, 719 Color section, 724–730 complete (extended) API, 677 Composite section, 680 Conditionals section, 689 Constants section, 743 Control section, 684–691 Conversion section, 681 Coordinates section, 719 Creating & Reading section, 728 Curves section, 693 Data section, 678–684 Environment section, 678 Files section, 710 Image (output) section, 710 Image section, 731–734 Input section, 702–709 introduction, 676–677 Iteration section, 685 Keyboard section, 705 Lights section, 719 Lights, Camera section, 718–724 Loading & Displaying (image) section, 733 Loading & Displaying (typography) section, 738 Logical Operators section, 689 Material Properties section, 720–724 Math section, 740–743 Metrics section, 740 Mouse section, 702 Operators section, 741 Output section, 710–712 PFont section, 737 Pixels section, 732 Primitive section, 679 Random section, 742 Reference command, Help menu, 158 Relational Operators section, 685 Rendering section, 734–736 Setting section, 725 Shape section, 691–701 String Functions section, 682 Structure section, 677 Text Area section, 710 Time & Date section, 708
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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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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 and 828: INDEX 796 classes, 304, 321 constan
Page 829: INDEX 798 coding in 3D, 616 mapping
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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