Processing: Creative Coding and Computational Art

More documents

Recommendations

Info

Figure 7-18. Generating a curve with a second-degree polynomial, mapped to the display window The scary-looking line float ratio = height/(2*pow(loopLimit-1, 2)-3*loopLimit-1 + 19); is your quadratic equation converted into code. The pow(loopLimit-1, 2) part uses Processing’s built-in pow() function. The function takes two arguments: the first is the value to act upon (the base), and the second is the power to raise the value to (the exponent), so pow(loopLimit-1, 2) is equal to (loopLimit – 1) 2 . In this case, the base is the expression loopLimit – 1. There is another important property of second-degree polynomials, also known as quadratic curves, that you’re not seeing in the plot. Quadratics don’t just form any old curves—they form parabolas, or bell-shaped symmetrical curves. However, to see the bell shape, you need to shift the curve to the right by width/2, and also begin your for loop at -width/2. Here’s the modified sketch code (shown in Figure 7-19): /* parabola y = 2x 2 -3x + 19; parabola fits within display window*/ size(400, 400); background(255); strokeWeight(3); float x = 0, y = 0; int loopLimit = 200; //shifts curve to the right int xShift = width/2; /*Instead of using the magic number 19324.0 in the ratio, I used the polynomial and plugged in the loop limit to get the maximum. This way if the window size changes, the program should still work.*/ float ratio = height/(2*pow(loopLimit-1, 2)-3*loopLimit-1 + 19); CURVES 265 7
PROCESSING: CREATIVE CODING AND COMPUTATIONAL ART 266 for (int i=-xShift; i
Page 1 and 2:
IrA GreenberG CreATe CoDe ArT, vIsu
Page 3 and 4:
Processing: Creative Coding and Com
Page 5 and 6:
CONTENTS AT A GLANCE Foreword . . .
Page 7 and 8:
CONTENTS Foreword . . . . . . . . .
Page 9 and 10:
CONTENTS viii The joy of math . . .
Page 11 and 12:
CONTENTS x Applying OOP to shape cr
Page 13 and 14:
CONTENTS xii Environment . . . . .
Page 15 and 16:
FOREWORD If you are like me (and th
Page 17 and 18:
ABOUT THE AUTHOR With an eclectic b
Page 19 and 20:
ACKNOWLEDGMENTS I am very fortunate
Page 21 and 22:
INTRODUCTION Welcome to Processing:
Page 23 and 24:
INTRODUCTION xxii Intended audience
Page 25 and 26:
INTRODUCTION xxiv Setting up Proces
Page 27 and 28:
INTRODUCTION xxvi Hopefully by now
Page 29 and 30:
INTRODUCTION xxviii Figure 3. Scree
Page 31 and 32:
INTRODUCTION xxx New or changed cod
Page 34 and 35:
1 CODE ART
Page 36 and 37:
The problem with a Photoshop filter
Page 38 and 39:
Figure 1-3. Example of ancient art
Page 40 and 41:
then jump 400 years to 1614 and Joh
Page 42 and 43:
fertile imagination remained intact
Page 44 and 45:
As an aside, it’s worth observing
Page 46 and 47:
John Whitney Sr., 1918-1995 John Wh
Page 48 and 49:
algorithms. To learn more about Coh
Page 50 and 51:
landfill/), and Feed (www.potatolan
Page 52 and 53:
periodicals such as Art Journal, Wi
Page 54 and 55:
And many more . . . While I have in
Page 58 and 59:
2 CREATIVE CODING
Page 60 and 61:
I think what was reinforced for me
Page 62 and 63:
customized commands, and run loops.
Page 64 and 65:
of code that work like processing m
Page 66 and 67:
introduced to become larger, more c
Page 68 and 69:
Without getting too geeky, the main
Page 70 and 71:
A framework is just a concept for b
Page 72 and 73:
algorithm in a math class in high s
Page 74 and 75:
frame. The loop keeps running and k
Page 76 and 77:
the time to play at whatever level
Page 78 and 79:
} pts[counter2].y-yg); xg*=-1; coun
Page 80 and 81:
The overall movement was good, but
Page 82 and 83:
Obviously, there are a lot of thing
Page 84 and 85:
} } // generates organic looking br
Page 88 and 89:
3 CODE GRAMMAR 101
Page 90 and 91:
Your first program In most programm
Page 92 and 93:
message comes up on the bar in the
Page 94 and 95:
Since the getBreed() method would r
Page 96 and 97:
Variables Variables are essential t
Page 98 and 99:
It’s because strict typing helps
Page 100 and 101:
Stage 3 adds the gradient: /* title
Page 102 and 103:
Next, I assign values to some primi
Page 104 and 105:
In the first preceding example, add
Page 106 and 107:
Assignment operators The only other
Page 108 and 109:
* title: Bouncing Ball description:
Page 110 and 111:
Animation is a perfect example of t
Page 112 and 113:
if (hunger= starving) { eatAnything
Page 114 and 115:
Ternary operator The last condition
Page 116 and 117:
The items array has 50 places reser
Page 118 and 119:
println(x); x += 1; } while(x
Page 120 and 121:
Figure 3-4. Continuous radial gradi
Page 122 and 123:
int ballCount = 500; int ballSize =
Page 124 and 125:
Hopefully, you were able to success
Page 126 and 127:
function call above*/ // fill(i*255
Page 128 and 129:
If you run this, you should see a 1
Page 130 and 131:
yspeed*=-1; } } Within the draw() f
Page 132 and 133:
void checkCollisions(int xp, int yp
Page 134 and 135:
createRect(50, 50, 100, 100, 20, 5,
Page 138 and 139:
4 COMPUTER GRAPHICS, THE FUN, EASY
Page 140 and 141:
Some of the reasons coding graphics
Page 142 and 143:
When working in a 3D coordinate sys
Page 144 and 145:
plotted, the vertices are connected
Page 146 and 147:
eally shines. And remember, as you
Page 148 and 149:
need to be stored in memory, and th
Page 150 and 151:
Within each of these application ar
Page 152 and 153:
don’t realize you’re doing it
Page 154 and 155:
Geometry Like algebra, geometry dat
Page 156 and 157:
(second-degree) curve has one turni
Page 158 and 159:
or possibly even a complete crash o
Page 160 and 161:
This linear motion would plot as a
Page 162 and 163:
and began doubling. By step 80, the
Page 164 and 165:
*Simple Repeating Wave Pattern Ira
Page 166 and 167:
float waveGap = 10; float frequency
Page 168 and 169:
a piece of paper and do a little mo
Page 170 and 171:
Interactivity Figure 4-13. Puff Peo
Page 172:
Events will be covered and implemen
Page 175 and 176:
PROCESSING: CREATIVE CODING AND COM
Page 177 and 178:
Page 179 and 180:
Page 181 and 182:
Page 183 and 184:
Page 185 and 186:
Page 187 and 188:
Page 189 and 190:
Page 191 and 192:
Page 193 and 194:
Page 195 and 196:
Page 197 and 198:
Page 199 and 200:
Page 201 and 202:
Page 204 and 205:
6 LINES
Page 206 and 207:
Figure 6-2. Two-point sketch Adding
Page 208 and 209:
Streamlining the sketch with a whil
Page 210 and 211:
type into the sketch. Although the
Page 212 and 213:
Figure 6-7. Randomized particle spr
Page 214 and 215:
Figure 6-9. Multiple randomized par
Page 216 and 217:
Coding a grid To begin, I’ll show
Page 218 and 219:
Notice that you can make the value
Page 220 and 221:
float steps = totalPts+1; int total
Page 222 and 223:
Creating space through fades Your l
Page 224 and 225:
for (int j=0; j
Page 226 and 227:
Figure 6-19. Yin Yang Fade sketch,
Page 228 and 229:
coordinates of the line. For exampl
Page 230 and 231:
Figure 6-24. End cap variation exam
Page 232 and 233:
Figure 6-25. Auto Layout sketch Thi
Page 234 and 235:
int xPadding = 150; int yPadding =
Page 236 and 237:
Figure 6-27. Table Layout II sketch
Page 238 and 239:
for (int i=0; i
Page 240 and 241:
This is the same drawTable() functi
Page 242 and 243:
easy. The benefit of internally rec
Page 244 and 245:
I call my custom function makeRect(
Page 246 and 247: As you might suspect, anti-aliasing
Page 248 and 249: call scribble function strokeWeight
Page 250 and 251: else { } // extra line needed to at
Page 252 and 253: smooth(); float x = random(width);
Page 254 and 255: Figure 6-36. Concentric Maze sketch
Page 256 and 257: void setup(){ //these values can be
Page 258 and 259: Create a Triangle size(400, 400); b
Page 260 and 261: Figure 6-39. Create 3 Triangles ske
Page 262 and 263: Poly Pattern I (table structure) /*
Page 264 and 265: 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
Page 284 and 285: lower particle speed ySpeed[i]*=gra
Page 286 and 287: Figure 7-11. Curves simulating a fo
Page 288 and 289: Figure 7-13. Damping effect on curv
Page 290 and 291: particle style strokeWeight(strokeS
Page 292 and 293: By using functions to organize a pr
Page 294 and 295: for (int i=0; i
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
Page 310 and 311: ezier(350, 100, 400, 150, 350, 250,
Page 312 and 313: Figure 7-30. Spline curve using Pro
Page 314 and 315: curve segments noFill(); // comment
Page 316 and 317: control handles fill(255); ellipse(
Page 318 and 319: Figure 7-32. bezier() vs. bezierVer
Page 320 and 321: curveVertex(92+x, 15); curveVertex(
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
Page 328 and 329: curveTightness(tightness); beginSha
Page 330: Summary Curves, and the math behind
Page 333 and 334: PROCESSING: CREATIVE CODING AND COM
Page 347 and 348:
Page 349 and 350:
Page 351 and 352:
Page 353 and 354:
Page 355 and 356:
Page 357 and 358:
Page 359 and 360:
Page 361 and 362:
Page 363 and 364:
Page 365 and 366:
Page 367:
Page 371 and 372:
Page 373 and 374:
Page 375 and 376:
Page 377 and 378:
Page 379 and 380:
Page 381 and 382:
Page 383 and 384:
Page 385 and 386:
Page 387 and 388:
Page 389 and 390:
Page 391 and 392:
Page 393 and 394:
Page 395 and 396:
Page 397 and 398:
Page 399 and 400:
Page 401 and 402:
Page 403 and 404:
Page 405 and 406:
Page 407 and 408:
Page 409 and 410:
Page 411 and 412:
Page 413 and 414:
Page 415 and 416:
Page 417 and 418:
Page 419 and 420:
Page 421 and 422:
Page 423 and 424:
Page 425 and 426:
Page 427 and 428:
Page 430 and 431:
10 COLOR AND IMAGING
Page 432 and 433:
left squares fill(255, 120, 0); rec
Page 434 and 435:
the color. Up to this point in the
Page 436 and 437:
} radius*=ratio; ratio-=.1; } } els
Page 438 and 439:
Figure 10-4. Alpha sketch In this e
Page 440 and 441:
A quick review of creating transfor
Page 442 and 443:
* Nematode - stage 1 Ira Greenberg,
Page 444 and 445:
Figure 10-8. Nematode sketch (stage
Page 446 and 447:
Figure 10-9. Finished Nematode sket
Page 448 and 449:
the decreasing wavelengths of the i
Page 450 and 451:
values, just to illustrate the poss
Page 452 and 453:
lerpColor() uses the same approach
Page 454 and 455:
I want to mention two final points
Page 456 and 457:
column for (int i=x; i
Page 458 and 459:
needs to be increased, as radius in
Page 460 and 461:
Figure 10-19. Wave Gradient sketch
Page 462 and 463:
for (int i=0; i
Page 464 and 465:
Figure 10-23. Load an Image sketch
Page 466 and 467:
The image() function has an extra f
Page 468 and 469:
In the last example, I created an a
Page 470 and 471:
Figure 10-27. Simple Image Encrypti
Page 472 and 473:
Figure 10-28. Pixilate sketch The n
Page 474 and 475:
Figure 10-30. Tint sketch Speeding
Page 476 and 477:
* Tint (using bitwise operations) C
Page 478 and 479:
the book that a primitive type is d
Page 480 and 481:
The mask works like an alpha channe
Page 482 and 483:
ect(random(width), random(height),
Page 484 and 485:
This last sketch couldn’t be simp
Page 486 and 487:
separate out and invert component c
Page 488 and 489:
Figure 10-39. GRAY Filter sketch Th
Page 490 and 491:
adius is set high, the blurring can
Page 492 and 493:
lend() PImage Method sketch // both
Page 494 and 495:
Figure 10-45. blend() Function with
Page 496 and 497:
The next sketch utilizes some for l
Page 498 and 499:
In the last example, I used Process
Page 500 and 501:
Inheritance In OOP, inheritance des
Page 502 and 503:
AXIS_VERTICAL from outside the Grad
Page 504 and 505:
y axis if(axis == AXIS_VERTICAL){ f
Page 506 and 507:
calculate differences between color
Page 508 and 509:
c7 = color(0); c8 = color(255); r1
Page 510:
In the “Imaging” section, you d
Page 513 and 514:
Page 515 and 516:
Page 517 and 518:
Page 519 and 520:
Page 521 and 522:
Page 523 and 524:
Page 525 and 526:
Page 527 and 528:
Page 529 and 530:
Page 531 and 532:
Page 533 and 534:
Page 535 and 536:
Page 537 and 538:
Page 539 and 540:
Page 541 and 542:
Page 543 and 544:
Page 545 and 546:
Page 547 and 548:
Page 549 and 550:
Page 551 and 552:
Page 553 and 554:
Page 555 and 556:
Page 557 and 558:
Page 559 and 560:
Page 561 and 562:
Page 563 and 564:
Page 565 and 566:
Page 567 and 568:
Page 569 and 570:
Page 571 and 572:
Page 573 and 574:
Page 575 and 576:
Page 577 and 578:
Page 579 and 580:
Page 581 and 582:
Page 583 and 584:
Page 585 and 586:
Page 587 and 588:
Page 589 and 590:
Page 591 and 592:
Page 594 and 595:
12 INTERACTIVITY
Page 596 and 597:
} public void mouseClicked(MouseEve
Page 598 and 599:
void setup(){ size(400, 400); // in
Page 600 and 601:
initialize x, y x = width/2.0; y =
Page 602 and 603:
float friction = .85; float[]jitter
Page 604 and 605:
nodeYPos = append(nodeYPos, mouseY)
Page 606 and 607:
As usual, I declare global variable
Page 608 and 609:
are filled with black. Using the in
Page 610 and 611:
} } } } } // bottom display window
Page 612 and 613:
color btnUpState = color(200, 200,
Page 614 and 615:
float xSpeed = 0; color movingSquar
Page 616 and 617:
xSpeed-=.2; btn1Background = btnDow
Page 618 and 619:
mouse trails if (isTrailable){ fill
Page 620 and 621:
isTrailsSelected, which changes the
Page 622 and 623:
shapes. The following example, in s
Page 624 and 625:
set initial button background color
Page 626 and 627:
also makes the code a little harder
Page 628 and 629:
stroke(200); rect(eraserBtn[0], era
Page 630 and 631:
} sliderValue = (sliderHandle[0]-sl
Page 632 and 633:
if (!isBrushSelected){ if (mouseX>b
Page 634 and 635:
selection can be active at a time.
Page 636 and 637:
ectBackground = color(255, 0, 0); }
Page 638 and 639:
is smaller (vertically) than the en
Page 640 and 641:
keys 2-8 control number of edges fo
Page 642 and 643:
strokeWeight(strokeWt); float angle
Page 644:
Summary We began this chapter compa
Page 647 and 648:
Page 649 and 650:
Page 651 and 652:
Page 653 and 654:
Page 655 and 656:
Page 657 and 658:
Page 659 and 660:
Page 661 and 662:
Page 663 and 664:
Page 665 and 666:
Page 667 and 668:
Page 669 and 670:
Page 671 and 672:
Page 673 and 674:
Page 675 and 676:
Page 677 and 678:
Page 679 and 680:
Page 681 and 682:
Page 683 and 684:
Page 685 and 686:
Page 687 and 688:
Page 689 and 690:
Page 691 and 692:
Page 693 and 694:
Page 695 and 696:
Page 697 and 698:
Page 699 and 700:
Page 701 and 702:
Page 703 and 704:
Page 706 and 707:
A PROCESSING LANGUAGE API
Page 708 and 709:
http://processing.org/. My main obj
Page 710 and 711:
its binary equivalent. I used some
Page 712 and 713:
part of the article as well. My sug
Page 714 and 715:
Example 1: A Java approach void set
Page 716 and 717:
The combination of these two struct
Page 718 and 719:
Example 3: Creating a honeycomb gra
Page 720 and 721:
Conditionals Conditionals and the r
Page 722 and 723:
Shape // top and bottom boundaries
Page 724 and 725:
You’ll notice that by default, th
Page 726 and 727:
start dragging if flag true for (in
Page 728 and 729:
pushMatrix(); rotateY(-frameCount*P
Page 730 and 731:
egular polygon size(400, 400); smoo
Page 732 and 733:
texture(images[3]); vertex(w, -h/2,
Page 734 and 735:
lots of arrays float[]x = new float
Page 736 and 737:
Keyboard Figure A-9. Box Springs sk
Page 738 and 739:
entering CMD). When using a command
Page 740 and 741:
hour hand strokeWeight(2); stroke(5
Page 742 and 743:
In the next example, I use beginRec
Page 744 and 745:
Transformations include moving, sca
Page 746 and 747:
float ang; int rows = 20; int cols
Page 748 and 749:
vertex(-w/2 + shiftX, -h/2 + shiftY
Page 750 and 751:
Lights The Lights section includes
Page 752 and 753:
system, you can try lowering the re
Page 754 and 755:
ankAngle+=bankSpeed; vert = -600 +z
Page 756 and 757:
Setting The Setting section include
Page 758 and 759:
ellipseMode(CORNER); fill(200, 200,
Page 760 and 761:
of this part of the API. These myst
Page 762 and 763:
Image The Image section relates ver
Page 764 and 765:
Loading & Displaying The Loading &
Page 766 and 767:
these elements is the creation of a
Page 768 and 769:
Typography Processing utilizes mult
Page 770 and 771:
This will output a list of all the
Page 772 and 773:
“Operators” will hopefully soun
Page 774 and 775:
The noise() function is an advanced
Page 778 and 779:
B MATH REFERENCE
Page 780 and 781:
After multiplying, you can reduce t
Page 782 and 783:
Here’s an example: When dividing,
Page 784 and 785:
Figure B-1. Using a right triangle
Page 786 and 787:
Here’s how the process works: pic
Page 788 and 789:
In Figure B-5, the point p is at 45
Page 790 and 791:
ect (px, py, 5, 5); stroke(100); li
Page 792 and 793:
manipulation is one area in which b
Page 794 and 795:
the number, as shown in the followi
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 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
show all

Processing: Creative Coding and Computational Art

Create successful ePaper yourself

Delete template?

Save as template?