Processing: Creative Coding and Computational Art

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control handles fill(255); ellipse(92, 15, 8, 8); ellipse(134, 15, 8, 8); ellipse(215, 92, 8, 8); ellipse(215, 134, 8, 8); ellipse(135, 205, 8, 8); ellipse(105, 205, 8, 8); ellipse(50, 145, 8, 8); ellipse(50, 105, 8, 8); ellipse(100, 54, 8, 8); ellipse(125, 54, 8, 8); ellipse(175, 100, 8, 8); ellipse(175, 125, 8, 8); ellipse(134, 160, 8, 8); ellipse(118, 160, 8, 8); ellipse(92, 140, 8, 8); ellipse(92, 130, 8, 8); //bezierVertex() - closed and no fill strokeWeight(2); int x = 200; noFill(); beginShape(); vertex(50+x, 50); bezierVertex(92+x, 15, 134+x, 15, 175+x, 50); bezierVertex(215+x, 92, 215+x, 134, 175+x, 175); bezierVertex(135+x, 205, 105+x, 205, 75+x, 175); bezierVertex(50+x, 145, 50+x, 105, 75+x, 75); bezierVertex(100+x, 54, 125+x, 54, 150+x, 75); bezierVertex(175+x, 100, 175+x, 125, 150+x, 150); bezierVertex(134+x, 160, 118+x, 160, 100+x, 150); bezierVertex(92+x, 140, 92+x, 130, 100+x, 115); endShape(CLOSE); //lines connecting anchor points to control handles strokeWeight(1); stroke(0); line(50+x, 50, 92+x, 15); line(134+x, 15, 175+x, 50); line(175+x, 50, 215+x, 92); line(215+x, 134, 175+x, 175); line(175+x, 175, 135+x, 205); line(105+x, 205, 75+x, 175); line(75+x, 175, 50+x, 145); line(50+x, 105, 75+x, 75); line(75+x, 75, 100+x, 54); line(125+x, 54, 150+x, 75); line(150+x, 75, 175+x, 100); line(175+x, 125, 150+x, 150); line(150+x, 150, 134+x, 160); line(118+x, 160, 100+x, 150); line(100+x, 150, 92+x, 140); line(92+x, 130, 100+x, 115); //control handles fill(255); ellipse(92+x, 15, 8, 8); ellipse(134+x, 15, 8, 8); ellipse(215+x, 92, 8, 8); ellipse(215+x, 134, 8, 8); ellipse(135+x, 205, 8, 8); ellipse(105+x, 205, 8, 8); ellipse(50+x, 145, 8, 8); ellipse(50+x, 105, 8, 8); ellipse(100+x, 54, 8, 8); ellipse(125+x, 54, 8, 8); ellipse(175+x, 100, 8, 8); ellipse(175+x, 125, 8, 8); ellipse(134+x, 160, 8, 8); ellipse(118+x, 160, 8, 8); ellipse(92+x, 140, 8, 8); ellipse(92+x, 130, 8, 8); CURVES 285 7
PROCESSING: CREATIVE CODING AND COMPUTATIONAL ART 286 //bezierVertex() - open and filled strokeWeight(2); x = 400; fill(127); beginShape(); vertex(50+x, 50); bezierVertex(92+x, 15, 134+x, 15, 175+x, 50); bezierVertex(215+x, 92, 215+x, 134, 175+x, 175); bezierVertex(135+x, 205, 105+x, 205, 75+x, 175); bezierVertex(50+x, 145, 50+x, 105, 75+x, 75); bezierVertex(100+x, 54, 125+x, 54, 150+x, 75); bezierVertex(175+x, 100, 175+x, 125, 150+x, 150); bezierVertex(134+x, 160, 118+x, 160, 100+x, 150); bezierVertex(92+x, 140, 92+x, 130, 100+x, 115); endShape(); //lines connecting anchor points to control handles strokeWeight(1); stroke(0); line(50+x, 50, 92+x, 15); line(134+x, 15, 175+x, 50); line(175+x, 50, 215+x, 92); line(215+x, 134, 175+x, 175); line(175+x, 175, 135+x, 205); line(105+x, 205, 75+x, 175); line(75+x, 175, 50+x, 145); line(50+x, 105, 75+x, 75); line(75+x, 75, 100+x, 54); line(125+x, 54, 150+x, 75); line(150+x, 75, 175+x, 100); line(175+x, 125, 150+x, 150); line(150+x, 150, 134+x, 160); line(118+x, 160, 100+x, 150); line(100+x, 150, 92+x, 140); line(92+x, 130, 100+x, 115); //control handles fill(255); ellipse(92+x, 15, 8, 8); ellipse(134+x, 15, 8, 8); ellipse(215+x, 92, 8, 8); ellipse(215+x, 134, 8, 8); ellipse(135+x, 205, 8, 8); ellipse(105+x, 205, 8, 8); ellipse(50+x, 145, 8, 8); ellipse(50+x, 105, 8, 8); ellipse(100+x, 54, 8, 8); ellipse(125+x, 54, 8, 8); ellipse(175+x, 100, 8, 8); ellipse(175+x, 125, 8, 8); ellipse(134+x, 160, 8, 8); ellipse(118+x, 160, 8, 8); ellipse(92+x, 140, 8, 8); ellipse(92+x, 130, 8, 8);
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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
Page 266 and 267: Poly Pattern III (polystar) /* Poly
Page 268 and 269: Figure 6-46. Poly Pattern III (poly
Page 272 and 273: 7 CURVES
Page 274 and 275: size(200, 200); background(255); in
Page 276 and 277: You should notice some familiar str
Page 278 and 279: int margin = height/15; strokeWeigh
Page 280 and 281: Figure 7-8. Revealing the points ma
Page 282 and 283: * Curves II Ira Greenberg, December
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Page 286 and 287: Figure 7-11. Curves simulating a fo
Page 288 and 289: Figure 7-13. Damping effect on curv
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Page 292 and 293: By using functions to organize a pr
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Page 296 and 297: Figure 7-18. Generating a curve wit
Page 298 and 299: float x = 0, y = 0; int loopLimit =
Page 300 and 301: concentric circles size(200, 200);
Page 302 and 303: Pie charts, although valuable as vi
Page 304 and 305: curve() and bezier() The next two P
Page 306 and 307: Next is an interactive example that
Page 308 and 309: Figure 7-27. Interpolating a Bézie
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Page 312 and 313: Figure 7-30. Spline curve using Pro
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Page 318 and 319: Figure 7-32. bezier() vs. bezierVer
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Page 322 and 323: strokeWeight(.75); stroke(0); rectM
Page 324 and 325: Figure 7-35. Bézier Ellipse sketch
Page 326 and 327: I included one last example (shown
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Page 330: 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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In Figure B-5, the point p is at 45
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ect (px, py, 5, 5); stroke(100); li
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manipulation is one area in which b
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the number, as shown in the followi
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Here’s the output: c1 in binary =
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This sketch outputs the following:
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I’m not going to provide examples
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simple-looking paint bucket tool in
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Figure B-7. Color variations filter
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INDEX 776 SYMBOLS AND NUMERICS /* a
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INDEX 778 beginShape function, 209
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INDEX 780 clipping planes, frustum,
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INDEX 782 naming conventions/rules,
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INDEX 784 functions, 440 loadPixels
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INDEX 786 filter function, 452-459
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INDEX 788 minute, 708 modelX/modelY
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INDEX 790 H haptics, 108 has-a rela
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INDEX 792 MouseListener interface,
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INDEX 794 M Mac keyboard shortcuts,
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INDEX 796 classes, 304, 321 constan
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INDEX 798 coding in 3D, 616 mapping
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INDEX 800 procedures see functions
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INDEX 802 Hybrid Shape, 366, 368 Hy
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INDEX 804 radians, converting betwe
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INDEX 806 Nematode sketch, 411, 413
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INDEX 808 text Orbiting Text sketch
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INDEX 810 VERY_HIGH option, encrypt
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