Processing: Creative Coding and Computational Art

More documents

Recommendations

Info

Hopefully you noticed that the only difference between the good and bad code is the absence of the this keyword at the beginning of the bad code assignments. If you don’t use the this keyword, the compiler uses the local parameters on both sides of the assignment operator. The special keyword this refers to the class itself. Thus, this.meatType is the property, not the parameter of the same name. As I mentioned, if you don’t use the keyword this, the compiler will only use the local parameter within the constructor block—so an assignment like meatType = meatType doesn’t pass a value to the property, but just uselessly assigns the parameter value back to the parameter—meaning nothing really happens. I realize that if this is totally new to you, it may seem like an obscure point, but it really isn’t. Is there any way to avoid using the this keyword? Well, there is, actually. If I had used distinct property and parameter names, I could have avoided using the this keyword. For example, the following constructor could be safely substituted for the second constructor in the BurritoRecipe class example: //basic burrito recipe--add toppings later BurritoRecipe(String tortFlavor, String bType, String mType){ //initialize properties tortillaFlavor = tortFlavor; beanType = bType; meatType = mType; } I still could use the this keyword in front of the properties on the left of the assignments if I wanted to, but it is not required any longer. Ultimately, you can do your constructor initializations either way: using the same named properties and parameters and the this keyword in front of the properties, or keeping the property and parameter names distinct. In my humble opinion, using the same names for the properties and parameters ultimately makes things simpler, and also helps you to see what parameter to assign to what property. But not everyone would agree with me. When you start looking at other people’s code, you’ll see this handled both ways—even though I think I’m right. Methods After the constructors, there is a long list of methods, in the following style: int getSize() { return this.size; } void setSize(int size) { this.size = size; } OBJECT-ORIENTED PROGRAMMING In OOP, there is a convention to structure methods utilizing the get/set prefix appended to the property names (commonly referred to as get/set methods, or “getters” and “setters”), as illustrated in the preceding code. Not all your methods will be getters and setters, but generally it is desirable to have a get and set method for each property. In pure OOP (which you’re not totally burdened with here), the idea is that a class’s properties 311 8
PROCESSING: CREATIVE CODING AND COMPUTATIONAL ART 312 should not be targeted directly and the properties should actually be made private, using the optional private keyword (called an access modifier) in front of the property declaration. For example private String meatType If you make the property private, you will not be allowed to directly target it from outside the class. Instead, you are forced to use its respective public get/set methods. So, instead of myBurritoRecipe.meatType = "chicken" or String meat = myBurritoRecipe. meatType;, classic OOP says you must use myBurritoRecipe.setMeatType("chicken"); or String meat = myBurritoRecipe.getMeatType();—I suspect this might be confusing, so for now, you can go ahead and be naughty and just target your properties directly, which is actually encouraged in Processing. In addition to the getter and setter methods, most classes also have additional methods that do more interesting things (thank goodness). For example, the printRecipe() method in this program outputs burrito cooking instructions. void printRecipe(){ println("Burrito Recipe:"); println("---------------"); if (this.tortillaFlavor!=null){ println("Steam or lightly pan heat a " + this.tortillaFlavor + ➥ " tortilla."); if (this.beanType!=null){ println("Sauté fresh onions, garlic, cilantro, slowly ➥ mixing in " + this.beanType + " beans and white wine."); } if (this.meatType!=null){ println("Grill " + this.meatType+" along with fresh green ➥ pepper, jalapeno pepper, chile pepper, onions and garlic."); } if (this.toppings!=null){ for (int i =0; i< toppings.length; i++){ println("Add " + toppings[i]+"."); } } if (this.salsaTemperature>0){ println("Finish off with a generous spritz of " + ➥ this.salsaTemperature+" alarm salsa."); } } else { println("Uh, you'll need to give me some ingredients\n" + ➥ "if you actually want me to produce a recipe."); } // go to next line after printing // cooking instructions to the screen
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 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
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 341: PROCESSING: CREATIVE CODING AND COM
Page 367: PROCESSING: CREATIVE CODING AND COM
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?