Processing: Creative Coding and Computational Art

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Transform section, 712–718 Trigonometry section, 742 Typography section, 737–740 Vertex section, 698 viewing options, 676 Web section, 707 Processing discourse board, 157 Processing environment, 144–170 Processing files, 150 Processing framework, 39 Processing functions see functions, list of Processing IDE, 30, 144–170 Processing libraries, 743 Import Library command, 154 importing PDF library, 712 Processing modes see modes Processing programs see also coding; Processing programs, list of arrays, 83–85 conditional statements, 76–83 functions, 96–103 functions with arguments, 60 functions without arguments, 61 how Processing IDE works, 145 literals, 64 logical flow of programs, 74 loops, 85–96 operators, 72–76 parentheses defining functions, 60 semicolons in, 60 statements, 60 switch statements, 81–82 variables, 65–72 Processing programs, list of see also Processing sketches algorithmic tree, 45–53 Bouncing Ball program, 76, 90 continuous radial gradient program, 88 drawing black rectangle, 32 Java applet version of, 38 OOP version of, 35 drawing rectangle, 96, 97 Hello Earth program, 59 mail merge program, 89–90 Many Bouncing Balls program, 90, 96 moving box across screen, 98 stepped radial gradient program, 68 Processing sketches, 144 see also sketches; Processing programs, list of .pde suffix, 147 1D Collision Using Conservation of Momentum, 557 1D Collision with Swapping Velocities, 554 2D Collision Using Conservation of Momentum, 559 Acceleration Calculations sketch output, 495 acceleration with gravity, 494 Alpha, 407 Analog Clock, 709 arcs with bounding boxes, 344, 345 Asteroid Shower, 551 Bézier Ellipse, 292, 294 bezier() vs. bezierVertex(), 287 blend function using SUBTRACT mode, 464, 465, 466 blend, 461, 462, 463 BlendColor and LerpColor, 730 blendColor, 420 BLUR Filter, 458 Box Springs, 705 Button, 579, 580 Collision Detection and Timeout, 491 Color Banding with pixels[], 431 Color Component Functions, 423 Color Modes RGB/HSB, 416 Color Shift, 401 Color, 727 Color Static, 432 Compositing, 436 concentric maze, 222, 223 Contrast (using bitwise operations), 448 create triangle, 227 Cube to Pyramid to Cone to Cylinder, 660–661 Cubes Contained Within a Cube, 634 Cubic Grid, 624 Curve Ellipse, 297 curve() vs. curveVertex(), 289 Curves, 695 Disintegrating Quad Wall, 356 Drawing a Door, 385 Drawing Application, 591 drawing cubes, 166 drawing rectangle with OOP, 381 drawing shapes, 159 Drawing Some Roofs, 391 Drawing Some Windows, 388 ellipses with bounding boxes, 344 Extrusion Example, 651 hollow box version, 655 solid box version, 655 wireframe box version, 656 Fade-Spin, 408 Fading, 492 FlyThrough, 724 From Neg to Pos, 455 generating polygon, 162 GRAY Filter, 457 grid sketches, 185, 188 HoneyComb, 688 horizontal and vertical fade to black, 193 horizontal fade to black, 191 how Processing IDE works, 145 INDEX 801
INDEX 802 Hybrid Shape, 366, 368 Hybrid Springy Dude, 518 Image Encryption, 439 Image Tiling, 435 ImageMap, 701 incorporating AWT or Swing components, 590 Interactive Button, 580–582 Final Interactive Button, 582–590 First Button, 579, 580 Interactive Toroid helix variation, 668 picture frame variation, 668 polyhedron variation, 669 toroid variation, 667 wireframe sphere variation, 667 INVERT Filter, 452 Java bytecode, 145 lerpColor, 421 line strip, 221 Linear Gradient, 425 Load an Image, 433 Mask the Sky, 449 Mask the Sky with Gradient, 450 maze tile, 224, 226 moiré pattern, 134 motion, 497, 499 Motion Painter, 611 Moving Along a Vector, 524 moving rectangle across screen with acceleration, 129 with constant speed, 128 Multi Modes, 418 multiple points in line, 176 Neighborhood, 396 Nematode, 411, 413, 415 Non-orthogonal Collision Based on Rotated Coordinates, 541 Non-orthogonal Collision with Multiple Ground Segments, 545 Non-orthogonal Reflection, 529 octagon, 359 Orbiting Text, 740 orthogonal vs. non-orthogonal collisions, 525 Painting Stripes, 485, 487 PImage blend method LIGHTEST mode, 468 Pixel Array Mask, 451 Pixels array (single white pixel), 430 Pixilate, 441 point recorder/plotter, 211 polygon creation, 229 Polygon Creator, 362 polygon with second radius (polystar), 230, 235, 237 polygonal table structure, 230, 232 Population Explosion, 691 POSTERIZE Filter, 458 progression of pie wedge shapes within table structure, 271 Progressive Tile, 734 Puff, 137, 139 Quad (quadrilateral), 355 Quads, Simple/Complex, 371 quadratic and cubic curves, 125 Radial Gradient, 427 Random Bounded Quads, 370 Random Triangles, 369 randomized pie wedge texture, 272 Ravenous Ellipse, 502 Ravenous Triangle, 504 Red Saturation, 442 repeating distorted sine curve, 134 repeating sine curve, 132 Rotated Triangle, 403 rotating concentric 3D polygons, 164 rotation of rectangle around XYZ axes, 641 ROY G BIV, 417 scribble plotter, 215, 218 shape builder and animator, 574 Single Axis 3D Rotation, 637 single-point, 174 sketch with background() commented out, 484 Spinning 3D Stuff, 697 Spinning Cube, 617 spiral built of polygons, 230, 233, 234 Subtractive ColorWheel, 405 Table Explode, 207, 208 Table Layout, 203, 205 Tesselated Plane, 377 three point, 175 THRESHOLD Filter, 456 Tile Designer, 736 Tint, 443 Tint (using bitwise operations), 446 Toy Truck, 354 Transform Example 1, 713 Transform Example 2, 718 Transformation Matrix, 410 Triangle Blur, 348 Triangle Flower, 351, 352 triangle, 346 Triangle Spin, 350 Triangle Zoom, 347 TRIANGLE_FAN, 375 TRIANGLE_STRIP Mode, 373 TRIANGLE_STRIP Spiral, 374 two point, 175 Two Rotating Custom Cubes, 631 Using Loop to Create 10 Rectangles, 686 Wave Gradient, 429
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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
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:
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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: INDEX 800 procedures see functions
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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