[JAVA][Beginning Java 8 Games Development]

More documents

Recommendations

Info

Chapter 17 ■ Enhancing Game Play: Creating a Scoring Engine, Adding Treasure and an Enemy Auto-Attack Engine Invoking a .shootProjectile() Method: Setting shootBullet to True Inside each of the if(takeSides) conditional if-else structures, in the else portion of the statement, add a bulletOffset variable setting (480 or 120) and set shootBullet equal to true. The Java code, seen in Figure 17-42, will look like this: if(takeSides) { spriteFrame.setScaleX(1); this.setIsFlipH(false); if(!onScreen) { destination = 500; if(spriteMoveR >= destination) { spriteMoveR-=2; spriteFrame.setTranslateX(spriteMoveR); } else { bulletOffset = 480; shootBullet = true; onScreen = true; } Figure 17-42. Add bulletOffset values and shootBullet=true statements into the sprite-reached-destination else body www.it-ebooks.info 433
Chapter 17 ■ Enhancing Game Play: Creating a Scoring Engine, Adding Treasure and an Enemy Auto-Attack Engine Now that you have set up the variables and if(shootBullet) structure in the .update() method, which will call the .shootProjectile() method to launch the Projectile objects out of the iBeagle Enemy Actor bazooka, we can start to create the code that will animate the iBullet object (and later, the iCheese object as well) in a similar way to how we created our Enemy animation functionality. Shooting Projectiles: Coding the .shootProjectile( ) Method If you have not already created an empty private void shootProjectile(){} method structure to get rid of those wavy red error highlights in your code, you can do so now. Inside of this method, we will again have the if(!takeSides) and if(takeSides) conditional structures, to segregate the different logic for each side of the Stage. This is similar to what we did to animate the Enemy character onto the screen in the .initiateAttack() method. The first Java statement will position the Y location, this time using the randomOffset variable inside of the .setTranslateY() method call off of an iBullet.spriteFrame ImageView object. The randomOffset variable adjusts bullet placement relative to the bazooka barrel. The next two .setScaleX and .setScaleY() method calls reduce the bullet image scale by half (0.5) and also flip the bullet using the -0.5 value. It is interesting to note here than any negative value, not just -1, will mirror around an axis. The next line of code sets the bulletRange variable to -50, before the if(bulletOffset >= bulletRange) conditional statement animates the bullet into position using a high velocity four pixels per pulse setting. This is coded the same way that we did this for the Enemy sprite, by using the bulletOffset variable that is used in the counter logic inside of the .setTranslateX() method call off of the iBullet.spriteFrame ImageView object inside of the if portion of the conditional statement. The else part of the if-else statement sets the shootProjectile variable to false, so only one shot is fired! The Java code for the if(takeSides) conditional if structure is similar, except it uses +=4, a bulletRange of 624, and an if(bulletOffset = bulletRange) { bulletOffset-=4; invinciBagel.iBullet.spriteFrame.setTranslateX(bulletOffset); } else { shootBullet = false; } } if(takeSides) { invinciBagel.iBullet.spriteFrame.setTranslateY(randomOffset); invinciBagel.iBullet.spriteFrame.setScaleX(0.5); invinciBagel.iBullet.spriteFrame.setScaleY(0.5); bulletRange = 624; if(bulletOffset
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:
Page 20 and 21:
Page 22 and 23:
Page 24 and 25:
Page 26 and 27:
Chapter 2 Setting Up Your Java 8 ID
Page 28 and 29:
Chapter 2 ■ Setting Up Your Java
Page 30 and 31:
Page 32 and 33:
Page 34 and 35:
Page 36 and 37:
Page 38 and 39:
Page 40 and 41:
Profiling Your Java 8 Game Applicat
Page 42 and 43:
Page 44 and 45:
Page 46 and 47:
Page 48 and 49:
Page 50 and 51:
Chapter 3 ■ A Java 8 Primer: An I
Page 52 and 53:
Page 54 and 55:
Page 56 and 57:
Page 58 and 59:
Page 60 and 61:
Page 62 and 63:
Page 64 and 65:
Page 66 and 67:
Page 68 and 69:
Page 70 and 71:
Page 72 and 73:
Page 74 and 75:
Page 76 and 77:
Page 78 and 79:
Page 80 and 81:
Page 82 and 83:
Chapter 4 ■ An Introduction to Ja
Page 84 and 85:
Page 86 and 87:
Page 88 and 89:
Page 90 and 91:
Page 92 and 93:
Page 94 and 95:
Page 96 and 97:
Page 98 and 99:
Page 100 and 101:
Page 102 and 103:
Page 104 and 105:
Page 106 and 107:
Chapter 5 An Introduction to Game D
Page 108 and 109:
Chapter 5 ■ An Introduction to Ga
Page 110 and 111:
Page 112 and 113:
Page 114 and 115:
Page 116 and 117:
Page 118 and 119:
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: Chapter 16 ■ Collision Detection:
Page 392 and 393: Chapter 17 Enhancing Game Play: Cre
Page 394 and 395: Chapter 17 ■ Enhancing Game Play:
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]

Create successful ePaper yourself

Delete template?

Save as template?