Processing: Creative Coding and Computational Art

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modes ellipseMode function, 342, 343 multimode capability of Processing, 144 programming modes, 158–162 basic mode, 158 continuous mode, 159–161 Java mode, 162 QUADS mode, beginShape(), 369, 370 QUAD_STRIP mode, beginShape(), 372 rectMode function, 110, 341, 342 rendering modes, 162–169 JAVA2D mode, 162–163 OPENGL mode, 166–169 P2D mode, 162 P3D mode, 164–165 shape modes, 368–374 state change following rectMode call, 342 textMode function, 740 TRIANGLES mode, beginShape(), 368, 369 TRIANGLE_FAN mode, beginShape(), 372 TRIANGLE_STRIP mode, beginShape(), 372 modulus operator, 73, 184, 741 Mohr, Manfred, 23 moiré patterns, 134, 136 momentum, law of conservation of, 555 monitor screen resolution, 115, 678 month function, 708 Moock, Colin, 23 motion see also animation accelerated motion, 129 adding fading to sketch, 491 collision detection, 487–491 collisions handling non-orthogonal collisions, 532–534 easing, 500–505 elapsed time, 491 inter-object collisions, 552–561 1D collisions, 552–556 2D collisions, 557–561 law of reflection, 525–532 linear motion, 129 object collisions, 520–534 object interactions, 500–520 simulating physics, 492–499 soft-body dynamics, 516–520 speed, 128 springing, 505–511 simulating spring behavior, 511–516 vectors, 521–522 applying vectors in collisions, 525 normalizing vectors, 523–525 Motion Painter sketch, 611 motion sketch, 497, 499 mouse events, 139, 565–590 adding interface elements, 579–590 detecting mouse events on buttons, 579 detecting multiple mouse clicks, 612 detecting which mouse button is pressed, 566 Final Interactive Button sketch, 582–590 First Button sketch, 579–580 Interactive Button sketch, 580–582 mouse click/drag/move detection, 565 mouse move events, 589, 590 mouse press events, 566, 588 mouse release detection, 565 mouse release events, 567, 589 Processing creating drawing application, 590–603 Mouse section, Processing API, 702 MouseAdapter class, Java, 565 mouseButton system variable, 566 mouseDragged function, 568, 702 MouseListener interface, Java, 564, 565 mouseMoved function, 569, 702 automatic syntax color highlighting, 568 Drawing Application example, 600 Final Interactive Button example, 589, 590 mousePressed function, 566 automatic syntax color highlighting, 568 detecting mouse events on buttons, 580 Drawing Application example, 599, 600 Final Interactive Button example, 588 shape builder and animator example, 578 Tile Designer sketch, 735 mousePressed variable, 566, 598, 702 mouseReleased function, 567, 568 automatic syntax color highlighting, 568 Drawing Application example, 600 Final Interactive Button example, 589 Tile Designer sketch, 736 mouseX variable, 702 moveShape function, 575, 578, 579 Moving Along a Vector sketch, 524 moving mouse see mouseMoved function Multi Modes sketch, 418 multidimensional arrays, 213 multiple inheritance of interface, 326, 331 multiple translations example, 620 multiplication multiplying algebraic expressions, 122 operator precedence, 121 shortcut assignment operation, 184 Musgrave, Ken, 23 N Nakamura, Yuko, 23 naming conventions/rules camelback notation, 63 case sensitivity of variable names, 65 class constructors, 309 INDEX 795
INDEX 796 classes, 304, 321 constant names, 325 file names, 148 identifiers, 63 illegal characters, 63 invalid suffixes for sketches, 148 legal names, 63, 65 reserved keywords, 65 sketches, 149 variables in loops, 183 Napier, John, 9 Napier, Mark, 18, 564 navigation opening file navigator, 154 negative numbers, 748 neighborhoods, creating, 381–396 Door class, 382–386 House class, 391–396 Neighborhood sketch, 396 Roof class, 389 Window class, 386–389 Nematode sketch, 411, 413, 415 net.flag interactivity with code art, 564 New button, toolbar, 149 New command, File menu, 151 new keyword class constructors, 309 creating objects, 379 memory allocation for arrays, 84 newline escape sequence, 380 nf function, 682 Ngan, William, 23 Nimoy, John, 23 “No accessible method” error, 148 noCursor function, 678 noFill function, 699 noise function, 743 noiseSeed function, 743 noLoop function, 491 non-orthogonal collisions see also orthogonal collisions handling, 532–534 handling by rotating coordinates, 532 Multiple Ground Segments sketch, 545 non-orthogonal 2D collisions, 557 orthogonal vs. non-orthogonal collisions, 525 Reflection sketch, 529 Rotated Coordinates sketch, 541 NORMALIZED mode, 549 normalizing vectors, 523–525 noSmooth function, 215, 698 noStroke function, 61, 71, 94 not (logical not) operator, 689 not equal to operator, 73 null keyword using with “is not equal to”, 313 number line, 109 numbers adding fractions, 749 adding negative numbers, 748 converting binary value into decimal, 762 dividing by zero, 748 dividing fractions, 749 exponential notation, 130 exponential-logarithm relationship, 750 formatting numbers into strings, 682 functions rounding numbers, 741 hexadecimal system, 728 magic numbers, 178 multiplying and dividing exponents, 750 multiplying fractions, 748 multiplying negative numbers, 748 negative exponents, 749 subtracting negative numbers, 748 O Oak, 36 Object class inheritance, 321 object reference assigning to extended class, 323 object-oriented programming see OOP object singletons, 678 objects, 33, 302, 303 see also OOP BurritoRecipe class example, 303 checkObjectCollision function, 552 constructors creating, 305 inter-object collisions, 552–561 methods and, 62 object collisions, 520–534 vectors, 521–534 object interactions, 500–520 easing, 500–505 springing, 505–516 properties and, 62 octagon sketch plotting shapes, 359 offset printers, 115 On, Josh, 23 online property, 678 OOP (object-oriented programming), 302–336 abstract keyword, 333, 469 applying OOP to shape creation, 378–381 BurritoRecipe class example, 303–318 calling methods in, 62 classes, 58, 302 composition, 323–336 curves as particle waves, 261 data hiding, 319–320 description, 34, 58, 302 design patterns for common implementations, 657
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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
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 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: INDEX 794 M Mac keyboard shortcuts,
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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