[JAVA][Beginning Java 8 Games Development]

More documents

Recommendations

Info

Chapter 3 ■ A Java 8 Primer: An Introduction to Java 8 Concepts and Principles Java Arithmetic Operators The Java arithmetic operators are the most commonly used in programming, especially in arcade type games, in which things are moving on the screen by a discrete number of pixels. Many more complex equations can be created using these basic arithmetic operators, as you have already learned in math class, from primary school through college. The only arithmetic operators shown in Table 3-2 that you may not be that familiar with are the modulus operator, which will return the remainder (what is left over) after a divide operation is completed, and the increment and decrement operators, which add or subtract 1, respectively, from a value. These are used to implement your counter logic. Counters (using increment and decrement operators) were originally used for loops, (which I will be covering in the next section); however, these increment and decrement operators are also extremely useful for game programming (point scoring, life span loss, game piece movement, and similar progressions). Table 3-2. Java Arithmetic Operators, Their Operation Type, and a Description of the Arithmetic Operation Operator Operation Description Plus + Addition Adds the operands on either side of the operator Minus – Subtraction Subtracts the right-hand operand from the left-hand operand Multiply * Multiplication Multiplies the operands on either side of the operator Divide / Division Divides the left-hand operand by the right-hand operand Modulus % Remainder Divides the left-hand operand by the right hand-operand, returning remainder Increment ++ Add 1 Increases the value of the operand by 1 Decrement -- Subtract 1 Decreases the value of the operand by 1 To implement the arithmetic operators, place the data field (variable) that you want to receive the results of the arithmetic operation on the left side of the equals assignment operator and the variables that you want to perform arithmetic operations on the right side of the equals sign. Here is an example of adding an x and a y variable and assigning the result to a z variable: Z = X + Y; // Using an Addition Operator If you want to subtract y from x, you use a minus sign rather than a plus sign; if you want to multiply the x and y values, you use an asterisk rather than a plus sign; and if you want to divide x by y, you use a forward slash instead of a plus sign. Here is how those operations look: Z = X - Y; // Subtraction Operator Z = X * Y; // Multiplication Operator Z = X / Y; // Division Operator You will be using these arithmetic operators quite a bit, so you will get some great practice with these before you are finished with this book! Let’s take a closer look at relational operators next, as sometimes you will want to compare values rather than calculate them. 62 www.it-ebooks.info
Java Relational Operators Chapter 3 ■ A Java 8 Primer: An Introduction to Java 8 Concepts and Principles The Java relational operators are used to make logical comparisons between two variables or between a variable and a constant, in some circumstances. These should be familiar to you from school and include equals, not equal, greater than, less than, greater than or equal to, and less than or equal to. In Java, equal to uses two equals signs side by side between the data fields being compared and an exclamation point before an equals sign to denote “not equal to.” Table 3-3 shows the relational operators, along with an example and a description of each. Table 3-3. Java Relational Operators, an Example in Which A = 25 and B = 50, and a Description of the Relational Operation Operator Example Description == (A == B) not true Comparison of two operands: if they are equal then the condition equates to true != (A != B) is true Comparison of two operands: if they are not equal the condition equates to true > (A > B) not true Comparison of two operands: if left operand is greater than right operand, equates to true < (A < B) is true Comparison of two operands: if left operand is less than right operand, equates to true >= (A >= B) not true Compare two operands: if left operand is greater or equal to right operand equates to true
Page 1:
www.it-ebooks.info
Page 4 and 5:
Contents at a Glance About the Auth
Page 6 and 7:
Introduction The Java Programming L
Page 8 and 9:
■ Introduction In Chapter 13 you
Page 10 and 11:
Chapter 1 ■ Setting Up a Java 8 G
Page 12 and 13:
Page 14 and 15:
Page 16 and 17:
Page 18 and 19: Chapter 1 ■ Setting Up a Java 8 G
Page 26 and 27: Chapter 2 Setting Up Your Java 8 ID
Page 28 and 29: Chapter 2 ■ Setting Up Your Java
Page 40 and 41: Profiling Your Java 8 Game Applicat
Page 50 and 51: Chapter 3 ■ A Java 8 Primer: An I
Page 82 and 83: Chapter 4 ■ An Introduction to Ja
Page 106 and 107: Chapter 5 An Introduction to Game D
Page 108 and 109: Chapter 5 ■ An Introduction to Ga
Page 118 and 119:
Chapter 5 ■ An Introduction to Ga
Page 120 and 121:
Page 122 and 123:
Page 124 and 125:
Page 126 and 127:
Page 128 and 129:
Chapter 6 The Foundation of Game De
Page 130 and 131:
Chapter 6 ■ The Foundation of Gam
Page 132 and 133:
Page 134 and 135:
Page 136 and 137:
Page 138 and 139:
Page 140 and 141:
Page 142 and 143:
Page 144 and 145:
Page 146 and 147:
Page 148 and 149:
Page 150 and 151:
Chapter 7 The Foundation of Game Pl
Page 152 and 153:
Page 154 and 155:
Page 156 and 157:
Page 158 and 159:
Page 160 and 161:
Page 162 and 163:
Page 164 and 165:
Page 166 and 167:
Page 168 and 169:
Page 170 and 171:
Chapter 8 Creating Your Actor Engin
Page 172 and 173:
Chapter 8 ■ Creating Your Actor E
Page 174 and 175:
Page 176 and 177:
Page 178 and 179:
Page 180 and 181:
Page 182 and 183:
Page 184 and 185:
Page 186 and 187:
Page 188 and 189:
Page 190 and 191:
Page 192 and 193:
Chapter 9 Controlling Your Action F
Page 194 and 195:
Chapter 9 ■ Controlling Your Acti
Page 196 and 197:
Page 198 and 199:
Page 200 and 201:
Page 202 and 203:
Page 204 and 205:
Page 206 and 207:
Page 208 and 209:
Page 210 and 211:
Page 212 and 213:
Chapter 10 Directing the Cast of Ac
Page 214 and 215:
Chapter 10 ■ Directing the Cast o
Page 216 and 217:
Page 218 and 219:
Page 220 and 221:
Page 222 and 223:
Page 224 and 225:
Page 226 and 227:
Page 228 and 229:
Page 230 and 231:
Page 232 and 233:
Page 234 and 235:
Chapter 11 ■ Moving Your Action F
Page 236 and 237:
Page 238 and 239:
Page 240 and 241:
Page 242 and 243:
Page 244 and 245:
Page 246 and 247:
Page 248 and 249:
Page 250 and 251:
Page 252 and 253:
Page 254 and 255:
Chapter 12 Setting Boundaries for Y
Page 256 and 257:
Chapter 12 ■ Setting Boundaries f
Page 258 and 259:
Page 260 and 261:
Page 262 and 263:
Page 264 and 265:
Page 266 and 267:
Page 268 and 269:
Page 270 and 271:
Page 272 and 273:
Page 274 and 275:
Page 276 and 277:
Chapter 13 ■ Animating Your Actio
Page 278 and 279:
Page 280 and 281:
Page 282 and 283:
Page 284 and 285:
Page 286 and 287:
Page 288 and 289:
Page 290 and 291:
Page 292 and 293:
Page 294 and 295:
Page 296 and 297:
Page 298 and 299:
Page 300 and 301:
Page 302 and 303:
Chapter 14 ■ Setting Up the Game
Page 304 and 305:
Page 306 and 307:
Page 308 and 309:
Page 310 and 311:
Page 312 and 313:
Page 314 and 315:
Page 316 and 317:
Page 318 and 319:
Page 320 and 321:
Page 322 and 323:
Page 324 and 325:
Chapter 15 Implementing Game Audio
Page 326 and 327:
Chapter 15 ■ Implementing Game Au
Page 328 and 329:
Page 330 and 331:
Page 332 and 333:
Page 334 and 335:
Page 336 and 337:
Page 338 and 339:
Page 340 and 341:
Page 342 and 343:
Page 344 and 345:
Chapter 16 ■ Collision Detection:
Page 346 and 347:
Page 348 and 349:
Page 350 and 351:
Page 352 and 353:
Page 354 and 355:
Page 356 and 357:
Page 358 and 359:
Page 360 and 361:
Page 362 and 363:
Page 364 and 365:
Page 366 and 367:
Page 368 and 369:
Page 370 and 371:
Page 372 and 373:
Page 374 and 375:
Page 376 and 377:
Page 378 and 379:
Page 380 and 381:
Page 382 and 383:
Page 384 and 385:
Page 386 and 387:
Page 388 and 389:
Page 390 and 391:
Page 392 and 393:
Chapter 17 Enhancing Game Play: Cre
Page 394 and 395:
Chapter 17 ■ Enhancing Game Play:
Page 396 and 397:
Page 398 and 399:
Page 400 and 401:
Page 402 and 403:
Page 404 and 405:
Page 406 and 407:
Page 408 and 409:
Page 410 and 411:
Page 412 and 413:
Page 414 and 415:
Page 416 and 417:
Page 418 and 419:
Page 420 and 421:
Page 422 and 423:
Page 424 and 425:
Page 426 and 427:
Page 428 and 429:
Page 430 and 431:
Page 432 and 433:
Page 434 and 435:
Page 436 and 437:
Page 438 and 439:
Page 440 and 441:
Page 442 and 443:
Page 444 and 445:
Page 446 and 447:
Page 448 and 449:
Page 450 and 451:
Page 452 and 453:
Page 454 and 455:
■ index Background image (cont.)
Page 456 and 457:
■ index InvinciBagel animation (c
Page 458 and 459:
■ index Modifier keywords access
Page 460 and 461:
Beginning Java 8 Games Development
Page 462 and 463:
This Java 8 Game Development book i
Page 464 and 465:
■ Contents NetBeans 8.0 Is User I
Page 466 and 467:
■ Contents ■■Chapter 5: An In
Page 468 and 469:
■ Contents Creating a Hero Superc
Page 470 and 471:
■ Contents Organizing the .update
Page 472 and 473:
■ Contents Optimizing the Scene G
Page 474 and 475:
About the Author Wallace Jackson ha
Page 476:
Acknowledgments I would like to ack
show all

[JAVA][Beginning Java 8 Games Development]

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?