Processing: Creative Coding and Computational Art

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handling pixel and image data, 113 pixel buffer, 113 Processing hiding complexity of, 114 raster graphics, 115 translucency, 114 buffers pixel buffer, 113 bugs see also debugging description, 44 history of term “software bug”, 13 BurritoRecipe class class declaration, 308 constructors, 309–311 methods, 311–318 OOP example, 303–318 printRecipe method, 312 Processing implementation, 314 properties, 308–309 Burton, Ed, 516 buttons adding interface elements, 579–590 detecting mouse events on, 579 Final Interactive Button sketch, 582–590 First Button sketch, 579–580 Interactive Button sketch, 580–582 buttons, toolbar, 149–150 bytecode, 37 Java code, 145 bytes saveBytes function, 710 unique values from a single byte, 65, 66 C Calculation section, Processing API, 741 camelback notation, 63 Camera section, Processing API, 719 Cartesian coordinate system, 109 converting from polar to, 228 case sensitivity variable names, 65 case statement Conditionals section, Processing API, 689 casting type casting, 67 Catmull-Rom spline implementation, 281 ceil function, 741 CENTER mode ellipse function, 342 rect function, 341 centerX/centerY variables soft-body dynamics, 519 CENTER_RADIUS mode ellipse function, 342 characters illegal characters, 63 checkBoundaryCollision function, 552 checkCollisions function, 99 checkGroundCollision function, 537, 540, 541, 543, 545, 550, 551 checkObjectCollision function, 552, 554, 556, 558 checkOverInitialNode function, 575, 576 checkWallCollision function, 536, 540, 545, 550, 551 Chinnathambi, Kirupa, 534 chromatic intensity property, 402 circles area of circle, 754 circumference of circle, 754 creating circles with arc(), 269 class constants, 470 class declaration, OOP, 308 class keyword, 304 creating classes, 379 class properties, 308, 325 classes see also Java classes abstract class declaration, 470 abstract classes, 333 abstract methods, 471 adding custom classes, 159 assigning object reference to extended class, 323 class constants, 470 class declaration, 308 continuous programming mode, 159 data types and, 325 description, 302, 303, 378 Door class, 382–386 getter and setter methods, 472 Gradient class, 469 House class, 391–396 inheritance, 302, 320–323 instance properties, 471 interacting with, 302 LinearGradient class, 472 multiple constructors, 305 naming conventions/rules, 304, 321 object-oriented programming, 58 organizing classes using multiple tabs, 478 packages, 321 packages solving same name class problem, 154 Processing using libraries of, 303 public interface, 391 RadialGradient class, 474 Roof class, 389 using classes in Processing, 317 Window class, 386–389 clear button Drawing Application example, 591, 593, 600, 602 clicks see also mouse events detecting multiple mouse clicks, 612 mousePressed function, 566 mouseReleased function, 567 INDEX 779
INDEX 780 clipping planes, frustum, 719 clocks Analog Clock sketch, 709 CLOSE argument, endShape function, 699 line loops, 226 plotting shapes, 359 Close, Chuck, 111 code debugging code, print function, 61 printing code, 152 representing lines with, 174–237 structuring code, 32 code art, interactivity with, 564 code artists, 14–24 code layout Auto Format command, Tools menu, 155 code libraries organizing into packages, 154 coding see also Processing programs algorithmic tree, 45–53 arrays, 83–85 case sensitivity of variable names, 65 comments, 60 conditional statements, 76–83 curly braces { }, 61 dot (.) syntax, 62 Format for Discourse command, 157 functions, 96–103 learning from coding mistakes, 44 literals, 64 loops, 85–96 operators, 72–76 programming modes, 158 structure in coding, 58 switch statements, 81–82 text editor, Processing window, 147 use of indentation, 62 variables, 65–72 whitespace, 60 coding in 3D, 616–672 3D engine, 618 3D rotations, 635–646 3D transformations, 618–624 computer optimization for rendering, 651 constructing brick tower, 647–650 creating custom cube, 625–635 Cube class, 626–634 cube to pyramid to cone to cylinder, 657–662 extrusion, 650–657 lathing, 663 P3D rendering engine, 616 perspective, 618 Point3D class, 625–626 Processing built-in 3D support, 616 rotation of rectangle around XYZ axes, 639 software options, 616 sphereDetail function, 696 Spinning 3D Stuff sketch, 697 spinning cube, 616 toroids, 662–671 Cohen, Harold, 16 collapse panes buttons, Processing window, 150 Collections framework, Java, 39 collision detection, 487–491 asteroid shower animation, 536, 550 checkCollisions function, 99 detectCollision function, 689 falling random bouncing strands, 252 moving box across screen, 99 Collision Detection and Timeout sketch, 491 collisions 1D collisions, 552–556 accounting for mass, 555 using Conservation of Momentum sketch, 557 with Swapping Velocities sketch, 554 2D collisions, 557–561 non-orthogonal 2D collisions, 557 using Conservation of Momentum sketch, 559 applying vectors in collisions, 525 asteroid shower animation, 535–551 checkBoundaryCollision function, 552 checkObjectCollision function, 552 handling non-orthogonal collisions, 532–534 by rotating coordinates, 532 inter-object collisions, 552–561 law of reflection, 525–532 object collisions, 520–534 orthogonal collisions, 521, 525 orthogonal vs. non-orthogonal collisions, 525 color 24-bit color, 113 48-bit color, 114 8-bit color, 114 accessing individual color component values, 422 Alpha sketch, 407 bits per pixel, 400 bitwise operations, 443–448 brightness vs. darkness of, 402 changing color of points, 174 chromatic intensity property, 402 Color Shift sketch, 401 controlling alpha transparency, 406–408 dithering, 114 Fade-Spin sketch, 408 fades creating space, 191–195 generating a color, 729 horizontal and vertical fade to black, 193 horizontal fade to black, 191 hue property, 402
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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,
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 and 808: INDEX 776 SYMBOLS AND NUMERICS /* a
Page 809: INDEX 778 beginShape function, 209
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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