Processing: Creative Coding and Computational Art

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animation, 117–119, 482–486 see also motion After Effects, 118 asteroid shower animation, 535–551 default frames per second, 79 Final Cut Pro, Apple, 119 Flash, 118 frame rate, 117 function controlling animation in Processing, 79 graphics, 108 in-betweens, 118 keyframes, 118 LightWave, 118 persistence of vision, 117 reasons to use Processing for, 119 static images and, 79 anti-aliasing aliasing compared in illustration, 215 description, 698 lines and curves, 245 noSmooth function, 215 Smooth option, Create Font dialog, 155 supersampling, 214 using smooth function, 214–219 APIs Processing API, 676–743 append function, 575, 682 examples using, 683–684 shape builder and animator example, 578 Applet class inheritance, 321 applet subdirectory, 150 applets, 150 Java applets, 37, 38 what applets can/can’t do, 710 arc, 268 arc function, 268–272 arcs with bounding boxes sketch, 344, 345 arguments, 269 creating circles with, 269 example illustrating pie shape feature, 344 pie chart, 270 Subtractive ColorWheel sketch, 406 Archive Sketch command, Tools menu, 157 arguments, 34 commas separating, 60 description of use of term, 97 functions with arguments, 60 functions without arguments, 61 parameters and, 209 parentheses defining functions, 60 arithmetical progression, 247 Array Functions section, Processing API, 682 arrayCopy function, 446 ArrayList class, Java, 682 arrays, 83–85 accessing values in, 85 adding values to end of, 682 adding values/arrays into, 682 altering length of, 682 appending data to, 683–684 array declarations, 84 changing size of arrays, 682 composite data types, 680 copying array of elements from, 682 data types, 84 deleting values from end of, 682 elements of, 85 mail merge program, 89 Many Bouncing Balls program, 93 multidimensional arrays, 213 pixels[] array, 430 size restriction on, 84 zero-indexing of, 85 Arrays class, Java, 682 art code artists, 14–24 history of computer art, 8–14 The Computer in Art, 13 assignment operator, 75–76 equals (equal to) operator and, 43, 75 shortcut syntax, 76, 184 asteroid shower developing animation, 535–551 Asteroid Shower sketch, 551 atan2 function, 742 2D collisions, 560 asteroid shower animation, 535 easing, 504 Atanasoff, John, 11 Attributes (shape) section, Processing API, 698 Attributes (typography) section, Processing API, 740 Auto Format command, Tools menu, 155 AWT components, 590 axis getAxis/setAxis methods, 474 Aztec stone of the sun, replica of, 6 B Babbage, Charles, 10, 11 background function, 484, 724 Bouncing Ball program, 79 collision detection, 489 description, 61 setting background color, 177 Ball class, 154, 552, 555 basic mode, 158 beautify, Auto Format command, 155 beginDraw function, 735 beginRecord function, 710 INDEX 777
INDEX 778 beginShape function, 209 applying vertex function, 219 arguments, 699 bezier() vs. bezierVertex() sketch, 287 calling vertex function, 210, 698, 699 creating custom 3D cube, 628 creating line strips, 220 extrusion example, 656 plotting shapes, 358, 359 polygon creation sketch, 229 QUAD_STRIP mode, 372 QUADS mode, 369, 370 TRIANGLES mode, 368, 369 TRIANGLE_FAN mode, 372 TRIANGLE_STRIP mode, 372 BEVEL constant, 228 Bézier curve connecting Bézier curves together, 279 cubic Bézier curve, 278 description, 693 interpolating Bézier curve within convex hull, 277 showing anchor and control points, 274 bezier function, 273–298 Bézier Ellipse sketches, 292–294 creating elliptical plots, 290 parameters, 281 bezierDetail function, 298 bezierPoint function, 298 bezierTangent function, 298 bezierVertex function, 284, 287, 698 creating hybrid shapes, 368 billiard ball physics, 552 binary machine code, 13 binary operators, 76 binary values, converting to decimal, 762 biographies, code artists, 14–24 bit mask, 769 bitwise complement (~), 769 bitwise operations, 443–448, 729, 760–773 color functions, 423 color variations filter using, 773 Contrast sketch, 448 description, 760 image using, 444 performing bitwise operations on color, 763 shifting bits, 763–767 signed bit, 765 Tint sketch, 446 two’s complement system, 765 bitwise operators, 767–769 AND (&), 767, 769 bitwise complement (~), 769 left shift (), 728, 763 XOR (^), 769 Bitwise Operators section, Processing API, 741 black-box design see encapsulation blend function, 452, 459–467 ADD mode, 463 BLEND mode, 463 DARKEST mode, 460, 463 display window or PImage, 459 LIGHTEST mode, 463, 468 SUBTRACT mode, 463, 464, 465, 466 blend method, PImage, 460 BLEND mode, blend function, 463 blend sketch, 461, 462, 463 BlendColor and LerpColor sketch, 730 blendColor function, 419, 420, 729 blendColor sketch, 420 blind spot of the eye, 117 block comment tags, 60 blue component color data structure, 762 specifying color value, 728 blue function, 422, 423, 728 blur gradient blur effect, 348 Triangle Blur sketch, 348 BLUR argument, filter function, 458, 459 BLUR Filter sketch, 458 boolean data type, 65 boolean keyword, 577 Boolean logic, 79, 685 Bouncing Ball programs, 76, 90 boundaries checkBoundaryCollision function, 552 collision detection, 487 bounding boxes, 344, 345 Box class, 302 box function see also rectangles coding in 3D, 618, 647, 696 creating custom 3D cube, 627 Extrusion Example sketch, 651 rotations, 637 Box Springs sketch, 705 boxes Extrusion Example sketches, 655 braces, curly braces { }, 61 branching algorithm, 47 break statements fades creating space, 192 switch statements, 82 brightness function, 422, 423, 728 browsers Java applets, 150 Brunelleschi, Filippo, 8 brush tool, 591, 598 BufferedImage class, Java, 112 32-bit color, 114 class structure, 112
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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
Page 758 and 759: ellipseMode(CORNER); fill(200, 200,
Page 760 and 761: of this part of the API. These myst
Page 762 and 763: Image The Image section relates ver
Page 764 and 765: Loading & Displaying The Loading &
Page 766 and 767: these elements is the creation of a
Page 768 and 769: Typography Processing utilizes mult
Page 770 and 771: This will output a list of all the
Page 772 and 773: “Operators” will hopefully soun
Page 774 and 775: The noise() function is an advanced
Page 778 and 779: B MATH REFERENCE
Page 780 and 781: After multiplying, you can reduce t
Page 782 and 783: Here’s an example: When dividing,
Page 784 and 785: Figure B-1. Using a right triangle
Page 786 and 787: Here’s how the process works: pic
Page 788 and 789: In Figure B-5, the point p is at 45
Page 790 and 791: ect (px, py, 5, 5); stroke(100); li
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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: INDEX 776 SYMBOLS AND NUMERICS /* a
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 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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