Processing: Creative Coding and Computational Art

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generating curve with second-degree polynomial, 264, 265 generating parabola with quadratic curve, 266 interpolating Bézier curve within convex hull, 277 lines and curves, 242–255 pie chart, 270 Processing’s curve functions, 267–298 repeating distorted sine curve, 134 repeating sine curve, 132 spline curve using curve function, 281, 693 vector graphics, 116 curves in geometry, 124–131 acceleration curve, 127 continuity, 126 cubic curve, 124 deceleration curve, 127 number of turning points in curves, 124 quadratic curve, 124 secant lines, 128 smoothness, 126 Curves section, Processing API, 693 Curves sketch, 695 curveTightness function controlling curvature using, 283 soft-body dynamics, 520 curveVertex function, 287, 298 creating hybrid shapes, 368 curve() vs. curveVertex(), 289 soft-body dynamics, 520 specifying curves, 698 custom functions see functions, list of Cut command, Edit menu, 153 cylinders constructing 3D brick tower, 647–650 cube to pyramid to cone to cylinder, 657–662 D damping effect on curves, 257 damping variable, 495 DARKEST mode, blend function, 460, 463 data conversion, 681 data hiding, 319–320 public properties in Processing, 320 Data section, Processing API, 678–684 data types arrays, 84 boolean, 65 classes as, 313, 325 color data type, 729 Data section, Processing API, 678 declaring primitive variable type, 65 declaring variables, 67 double data type, 309 dynamically typed languages, 67 float, 179, 309 int, 65 interfaces as, 331 PGraphics, 734 PImage, 433, 731 Point, 346 primitive types, 313, 679 Processing type and anti-aliasing, 215 statically typed languages, 67 strict typing, 66–72 String, 61, 65 type casting, 67 type conversions, 67 data visualization, 108 Davis, Joshua, 23 day function, 708 DBN (Design By Numbers) origin of Processing, 30 reason for creating, 8 debugging see also bugs logic errors, 81 message area indicating errors, 147 println function, 426 text area, Processing window, 147 deceleration curve, 127 decimal values, 309 decision statements see conditional statements Deck, Andy, 23 declaring variables, 66 decrement operator, 741 degrees, converting between radians and, 758 deltaX/deltaY variables asteroid shower animation, 538, 539 easing, 500, 504 springing, 506 Descartes, René, 109 deselectBtns function, 600, 602 design, computer-aided, 108 Design By Numbers see DBN design patterns common OOP implementations, 657 detectCollision function Population Explosion sketch, 689 development environments, 144–170 Digital Landfill, 18 directionX/directionY variable reflection, 530, 531 vectors, 522 directories Examples directory, 151 opening directory of current sketch, 154 Sketchbook directory, 151 display of information, graphics, 108 display size, setting, 177 display window blend function, 459 components, 409 INDEX 783
INDEX 784 functions, 440 loadPixels function, 451 DisplayMode class, Java, 111 distance formula Pythagorean theorem, 752 dithering, 114 division modulus operator, 73 operator precedence, 121 do . . . while loop, 86–87 Door class creating a neighborhood, 382–386 creating Door object, 386 Drawing a Door sketch, 385 methods, 382, 384 properties, 382 using Door objects in House class, 391, 393, 394 doping, 761 dot (.) syntax, 62 dot product calculation, 531 dots per inch (dpi) printing images, 116 double data type, 309 double keyword, 309 downloads, Processing, 59 dragging mouse mouseDragged function, 568 draw function adding fading to sketch, 491 asteroid shower animation, 550 Bouncing Ball program, 78, 79, 80 continuous mode introducing, 159 controlling animation in Processing, 79 Drawing Application example, 595, 598, 600 event detection, 140 Final Interactive Button example, 587 Many Bouncing Balls program, 95 moving box across screen, 98 shape builder and animator example, 575 threads in animation, 484 drawDoor method, 382, 384 drawEdge function, 575, 576 drawEllipse function, 293 drawHouse method, 393, 394 drawing application Processing creating, 590–603 raster-based approach, 590 vector-based approach, 590 Drawing Application sketch, 591 drawing methods vertices, 112 drawing modes see modes drawNode function, 575, 576 drawPoly function, 377 drawRectangle function, 96, 97 drawTable function, 205, 209 drawWindow method, 389 Dürer, Albrecht, 8 dynamically typed languages, 67 dynamics, soft-body, 516–520 E easing, 500–505 Edit menu, Processing window, 152–153 commands, 152 Copy command, 153 Cut command, 153 Find command, 153 Find Next command, 153 Paste command, 153 Redo command, 152 Select All command, 153 Undo command, 152 editors text editor, Processing window, 147 elements accessing values in arrays, 85 adding interface elements, 579–590 ellipse function, 61 arguments, 269 Bouncing Ball program, 79 changing default mode, 693 default mode, 342 default origin, 341 stepped radial gradient program, 72 ellipseMode function, 342, 343 arguments, 693 drawing arcs, 269 ellipses Curve Ellipse sketch, 297 curveEllipse function, 298 ellipses with bounding boxes sketch, 344 Ravenous Ellipse sketch, 502 elliptical plots creating elliptical plots, 290 creating elliptical spline plot, 295 else keyword Conditionals section, Processing API, 689 else statement see if . . . else syntax emissive function, 720 encapsulation, 319–320 description, 302 encapsulating procedural complexity, 378 tessellate function, 378 encrypt function, 438 encryption Image Encryption sketch, 439 VERY_HIGH option, 439 end caps for lines joining lines, 200 strokeCap function, 198, 199 strokeJoin function, 228 endDraw function, 735
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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
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 and 810: INDEX 778 beginShape function, 209
Page 811 and 812: INDEX 780 clipping planes, frustum,
Page 813: INDEX 782 naming conventions/rules,
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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