Processing: Creative Coding and Computational Art

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standardization, 37 state change following rectMode call, 342 statements, 60 conditional statements, 76–83 declaring primitive variable type, 65 semicolons in Processing programs, 60 switch statements, 81–82 static images, animation and, 79 static keyword, 308 class constants, 470 Door class, 383 static properties, 308, 325 static variables, 383 creating constants, 308 final keyword, 308 statically typed languages, 67 status function, 707 Stop button, toolbar, 149 Stop command, Sketch menu, 154 strict typing, 66–72 string concatenator using with print/println functions, 710 String data type, 61, 65 primitive data type or String object, 680 String Functions section, Processing API, 682 strings combines elements in array into, 682 comparing values of two strings, 681 composite data types, 680 concatenation operator (+), 313 converting into integers, 707 creating, 680–681 formatting numbers into, 682 removing whitespace around, 682 saveStrings function, 710 separating into arrays, 682 stroke, 698 stroke function, 403, 724 change color of points, 174 Drawing Application example, 597 multiple points in line sketch, 176 slightly reducing stroke weight of fine lines, 215 TRIANGLES mode, beginShape(), 369 strokeCap function, 198, 199, 698 strokeJoin function, 228, 698 strokeWeight function, 198, 698 structure in coding, 58 Structure section, Processing API, 677 structuring code, 32 subclasses inheritance in classes, OOP, 320 initializing properties in superclass, 322 object-oriented approach to color/imaging, 469 using properties from superclass, 322 subroutines see functions subset function, 682 shape builder and animator example, 578 SUBTRACT mode, blend function, 463, 464, 465, 466 subtraction operator precedence, 121 shortcut assignment operation, 184 subtractive color model, 406 Subtractive ColorWheel sketch, 405 suffixes .java suffix, 148 .pde suffix, 147, 148 .x suffix, 148 using invalid suffix, 148 super keyword, 322 superclass constructor, 646 superclasses abstract methods, 471 inheritance in classes, 320 object-oriented approach to color/imaging, 469 using properties in, 322 supersampling anti-aliasing, 214 surface normal normalizing vectors and, 525 Swing components incorporating in Processing sketches, 590 switch statements, 81–82 as alternative to if . . . else syntax, 81 break statements in, 82 Conditionals section, Processing API, 689 enumerated types, 82 value types, 82 syntax, 58 curly braces { }, 61 dot (.) syntax, 62 T Table Explode sketch, 207, 208 Table Layout sketch, 203, 205 tables creating table structure, 202–209 polygonal table structure, 230, 232 tabs, Processing window, 147 creating new tab, 148 Hide function, 148 indicating file type, 148 organizing classes using multiple tabs, 478 tags block comment tags, 60 tan function, 535 Tan, Manny, 23 tangent mnemonic for trig functions, 756 Tarbell, Jared, 21 ternary operator, 83 tessellate function, 378 Tesselated Plane sketch, 377 tessellation, shapes, 374–378 INDEX 807
INDEX 808 text Orbiting Text sketch, 740 Text Area section, Processing API, 710 text editor, Processing window, 147 collapse panes buttons, 150 Edit menu commands, 152 resizing window panes, 150 text function, 738 textAlign function, 740 textAscent function, 740 textDescent function, 740 textFont function, 738 textLeading function, 740 textMode function, 738, 740 textSize function, 740 texture function, 549, 699 texture mapping see image mapping textureMode function, 549, 699 textWidth function, 740 this keyword initializing properties, 311 local and global scope, 383 object-oriented approach to color/imaging, 473 reasons to use, 311 threads, 482 THRESHOLD argument, filter function, 456 THRESHOLD Filter sketch, 456 Tile Designer sketch, 736 tiling Image Tiling sketch, 435 Progressive Tile sketch, 734 time Collision Detection and Timeout sketch, 491 elapsed time, 491 Time & Date section, Processing API, 708 time functions, 491 tint function, 442 Tint sketch, 443 using bitwise operations, 446 tinting image using bitwise operations, 444 toolbar, Processing window, 149 buttons, 149–150 Tools menu, Processing window, 155–157 Archive Sketch command, 157 Auto Format command, 155 Color Picker command, 156 commands, 155 Create Font command, 155, 582 Format for Discourse command, 157 toroids, coding in 3D, 662–671 Interactive Toroid sketch helix variation, 668 picture frame variation, 668 polyhedron variation, 669 toroid variation, 667 wireframe sphere variation, 667 toruses see toroids towers constructing 3D brick tower, 647–650 Transform Example 1 sketch, 713 Transform Example 2 sketch, 718 Transform section, Processing API, 712–718 Transformation Matrix sketch, 410 transformations, 350–358, 618–624, 713 affine transformations, 352 AffineTransform class, Java, 352 creating transformations, 409 drawing 2D rectangle and rotating, 618 drawing 2D sphere and rotating, 619 order of transformations example, 620 Transform Example 1 sketch, 713 Transform Example 2 sketch, 718 transistors, 761 translate function affine transformations, 352 coding in 3D, 618 creating custom 3D cube, 628 creating transformations, 409 cumulative translations example, 621 description, 350 multiple translations example, 620 resetting affine transformation matrix, 357 transformations, 714 translucency/transparency 32-bit color and, 114 alpha function, 728 Alpha sketch, 407 bits per pixel, 400 color data structure, 762 color functions, 422 controlling alpha transparency, 406–408 fill function, 369 mask like alpha channel, 449 trapezoid, area of, 753 trees algorithmic tree, 45–53 triangle function, 345 triangles area of, 752 calculating vertices of, 226 create triangle sketch, 227 creating, 226, 227 Pythagorean theorem, 752 radians function, 228 Random Triangles sketch, 369 Ravenous Triangle sketch, 504 Rotated Triangle sketch, 403 Triangle Blur sketch, 348 Triangle Flower sketch, 351, 352 triangle sketch, 346 Triangle Spin sketch, 350 Triangle Zoom sketch, 347
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IrA GreenberG CreATe CoDe ArT, vIsu
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Processing: Creative Coding and Com
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CONTENTS AT A GLANCE Foreword . . .
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CONTENTS Foreword . . . . . . . . .
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CONTENTS viii The joy of math . . .
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CONTENTS x Applying OOP to shape cr
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CONTENTS xii Environment . . . . .
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FOREWORD If you are like me (and th
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ABOUT THE AUTHOR With an eclectic b
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ACKNOWLEDGMENTS I am very fortunate
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INTRODUCTION Welcome to Processing:
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INTRODUCTION xxii Intended audience
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INTRODUCTION xxiv Setting up Proces
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INTRODUCTION xxvi Hopefully by now
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INTRODUCTION xxviii Figure 3. Scree
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INTRODUCTION xxx New or changed cod
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1 CODE ART
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The problem with a Photoshop filter
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Figure 1-3. Example of ancient art
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then jump 400 years to 1614 and Joh
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fertile imagination remained intact
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As an aside, it’s worth observing
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John Whitney Sr., 1918-1995 John Wh
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algorithms. To learn more about Coh
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landfill/), and Feed (www.potatolan
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periodicals such as Art Journal, Wi
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And many more . . . While I have in
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2 CREATIVE CODING
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I think what was reinforced for me
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customized commands, and run loops.
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of code that work like processing m
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introduced to become larger, more c
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Without getting too geeky, the main
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A framework is just a concept for b
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algorithm in a math class in high s
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frame. The loop keeps running and k
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the time to play at whatever level
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} pts[counter2].y-yg); xg*=-1; coun
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The overall movement was good, but
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Obviously, there are a lot of thing
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} } // generates organic looking br
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3 CODE GRAMMAR 101
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Your first program In most programm
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message comes up on the bar in the
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Since the getBreed() method would r
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Variables Variables are essential t
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It’s because strict typing helps
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Stage 3 adds the gradient: /* title
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Next, I assign values to some primi
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In the first preceding example, add
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Assignment operators The only other
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* title: Bouncing Ball description:
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Animation is a perfect example of t
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if (hunger= starving) { eatAnything
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Ternary operator The last condition
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The items array has 50 places reser
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println(x); x += 1; } while(x
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Figure 3-4. Continuous radial gradi
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int ballCount = 500; int ballSize =
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Hopefully, you were able to success
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function call above*/ // fill(i*255
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If you run this, you should see a 1
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yspeed*=-1; } } Within the draw() f
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void checkCollisions(int xp, int yp
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createRect(50, 50, 100, 100, 20, 5,
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4 COMPUTER GRAPHICS, THE FUN, EASY
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Some of the reasons coding graphics
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When working in a 3D coordinate sys
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plotted, the vertices are connected
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eally shines. And remember, as you
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need to be stored in memory, and th
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Within each of these application ar
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don’t realize you’re doing it
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Geometry Like algebra, geometry dat
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(second-degree) curve has one turni
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or possibly even a complete crash o
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This linear motion would plot as a
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and began doubling. By step 80, the
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*Simple Repeating Wave Pattern Ira
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float waveGap = 10; float frequency
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a piece of paper and do a little mo
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Interactivity Figure 4-13. Puff Peo
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Events will be covered and implemen
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PROCESSING: CREATIVE CODING AND COM
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6 LINES
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Figure 6-2. Two-point sketch Adding
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Streamlining the sketch with a whil
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type into the sketch. Although the
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Figure 6-7. Randomized particle spr
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Figure 6-9. Multiple randomized par
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Coding a grid To begin, I’ll show
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Notice that you can make the value
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float steps = totalPts+1; int total
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Creating space through fades Your l
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for (int j=0; j
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Figure 6-19. Yin Yang Fade sketch,
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coordinates of the line. For exampl
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Figure 6-24. End cap variation exam
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Figure 6-25. Auto Layout sketch Thi
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int xPadding = 150; int yPadding =
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Figure 6-27. Table Layout II sketch
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for (int i=0; i
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This is the same drawTable() functi
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easy. The benefit of internally rec
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I call my custom function makeRect(
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As you might suspect, anti-aliasing
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call scribble function strokeWeight
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else { } // extra line needed to at
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smooth(); float x = random(width);
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Figure 6-36. Concentric Maze sketch
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void setup(){ //these values can be
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Create a Triangle size(400, 400); b
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Figure 6-39. Create 3 Triangles ske
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Poly Pattern I (table structure) /*
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Poly Pattern II (spiral) /* Poly Pa
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Poly Pattern III (polystar) /* Poly
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Figure 6-46. Poly Pattern III (poly
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7 CURVES
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size(200, 200); background(255); in
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You should notice some familiar str
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int margin = height/15; strokeWeigh
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Figure 7-8. Revealing the points ma
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* Curves II Ira Greenberg, December
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lower particle speed ySpeed[i]*=gra
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Figure 7-11. Curves simulating a fo
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Figure 7-13. Damping effect on curv
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particle style strokeWeight(strokeS
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By using functions to organize a pr
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for (int i=0; i
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Figure 7-18. Generating a curve wit
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float x = 0, y = 0; int loopLimit =
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concentric circles size(200, 200);
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Pie charts, although valuable as vi
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curve() and bezier() The next two P
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Next is an interactive example that
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Figure 7-27. Interpolating a Bézie
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ezier(350, 100, 400, 150, 350, 250,
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Figure 7-30. Spline curve using Pro
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curve segments noFill(); // comment
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control handles fill(255); ellipse(
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Figure 7-32. bezier() vs. bezierVer
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curveVertex(92+x, 15); curveVertex(
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strokeWeight(.75); stroke(0); rectM
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Figure 7-35. Bézier Ellipse sketch
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I included one last example (shown
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curveTightness(tightness); beginSha
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Summary Curves, and the math behind
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10 COLOR AND IMAGING
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left squares fill(255, 120, 0); rec
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the color. Up to this point in the
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} radius*=ratio; ratio-=.1; } } els
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Figure 10-4. Alpha sketch In this e
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A quick review of creating transfor
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* Nematode - stage 1 Ira Greenberg,
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Figure 10-8. Nematode sketch (stage
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Figure 10-9. Finished Nematode sket
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the decreasing wavelengths of the i
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values, just to illustrate the poss
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lerpColor() uses the same approach
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I want to mention two final points
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column for (int i=x; i
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needs to be increased, as radius in
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Figure 10-19. Wave Gradient sketch
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for (int i=0; i
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Figure 10-23. Load an Image sketch
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The image() function has an extra f
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In the last example, I created an a
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Figure 10-27. Simple Image Encrypti
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Figure 10-28. Pixilate sketch The n
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Figure 10-30. Tint sketch Speeding
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* Tint (using bitwise operations) C
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the book that a primitive type is d
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The mask works like an alpha channe
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ect(random(width), random(height),
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This last sketch couldn’t be simp
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separate out and invert component c
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Figure 10-39. GRAY Filter sketch Th
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adius is set high, the blurring can
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lend() PImage Method sketch // both
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Figure 10-45. blend() Function with
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The next sketch utilizes some for l
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In the last example, I used Process
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Inheritance In OOP, inheritance des
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AXIS_VERTICAL from outside the Grad
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y axis if(axis == AXIS_VERTICAL){ f
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calculate differences between color
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c7 = color(0); c8 = color(255); r1
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In the “Imaging” section, you d
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12 INTERACTIVITY
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} public void mouseClicked(MouseEve
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void setup(){ size(400, 400); // in
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initialize x, y x = width/2.0; y =
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float friction = .85; float[]jitter
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nodeYPos = append(nodeYPos, mouseY)
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As usual, I declare global variable
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are filled with black. Using the in
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} } } } } // bottom display window
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color btnUpState = color(200, 200,
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float xSpeed = 0; color movingSquar
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xSpeed-=.2; btn1Background = btnDow
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mouse trails if (isTrailable){ fill
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isTrailsSelected, which changes the
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shapes. The following example, in s
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set initial button background color
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also makes the code a little harder
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stroke(200); rect(eraserBtn[0], era
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} sliderValue = (sliderHandle[0]-sl
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if (!isBrushSelected){ if (mouseX>b
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selection can be active at a time.
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ectBackground = color(255, 0, 0); }
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is smaller (vertically) than the en
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keys 2-8 control number of edges fo
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strokeWeight(strokeWt); float angle
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Summary We began this chapter compa
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A PROCESSING LANGUAGE API
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http://processing.org/. My main obj
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its binary equivalent. I used some
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part of the article as well. My sug
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Example 1: A Java approach void set
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The combination of these two struct
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Example 3: Creating a honeycomb gra
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Conditionals Conditionals and the r
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Shape // top and bottom boundaries
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You’ll notice that by default, th
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start dragging if flag true for (in
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pushMatrix(); rotateY(-frameCount*P
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egular polygon size(400, 400); smoo
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texture(images[3]); vertex(w, -h/2,
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lots of arrays float[]x = new float
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Keyboard Figure A-9. Box Springs sk
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entering CMD). When using a command
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hour hand strokeWeight(2); stroke(5
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In the next example, I use beginRec
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Transformations include moving, sca
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float ang; int rows = 20; int cols
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vertex(-w/2 + shiftX, -h/2 + shiftY
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Lights The Lights section includes
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system, you can try lowering the re
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ankAngle+=bankSpeed; vert = -600 +z
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Setting The Setting section include
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ellipseMode(CORNER); fill(200, 200,
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of this part of the API. These myst
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Image The Image section relates ver
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Loading & Displaying The Loading &
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these elements is the creation of a
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Typography Processing utilizes mult
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This will output a list of all the
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“Operators” will hopefully soun
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The noise() function is an advanced
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B MATH REFERENCE
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After multiplying, you can reduce t
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Here’s an example: When dividing,
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Figure B-1. Using a right triangle
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Here’s how the process works: pic
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Page 796 and 797: Here’s the output: c1 in binary =
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Page 804: Figure B-7. Color variations filter
Page 807 and 808: INDEX 776 SYMBOLS AND NUMERICS /* a
Page 809 and 810: INDEX 778 beginShape function, 209
Page 811 and 812: INDEX 780 clipping planes, frustum,
Page 813 and 814: INDEX 782 naming conventions/rules,
Page 815 and 816: INDEX 784 functions, 440 loadPixels
Page 817 and 818: INDEX 786 filter function, 452-459
Page 819 and 820: INDEX 788 minute, 708 modelX/modelY
Page 821 and 822: INDEX 790 H haptics, 108 has-a rela
Page 823 and 824: INDEX 792 MouseListener interface,
Page 825 and 826: INDEX 794 M Mac keyboard shortcuts,
Page 827 and 828: INDEX 796 classes, 304, 321 constan
Page 829 and 830: INDEX 798 coding in 3D, 616 mapping
Page 831 and 832: INDEX 800 procedures see functions
Page 833 and 834: INDEX 802 Hybrid Shape, 366, 368 Hy
Page 835 and 836: INDEX 804 radians, converting betwe
Page 837: INDEX 806 Nematode sketch, 411, 413
Page 841: INDEX 810 VERY_HIGH option, encrypt
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