API tools faq
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w,h=term.getSize() -- 51  19
2
3
function monSign()

4
	monitor=peripheral.wrap("top")

5
	monitor.setTextScale(0.5)

6
	monW,monH=monitor.getSize()  --w 15  h 10

7
	monitor.clear()

8
	monitor.setCursorPos(6,4)

9
	monitor.write("SPACE")

10
	monitor.setCursorPos(4,6)

11
	monitor.write("INVADERS!")

12
end

13
14
function initVariables()

15
	keyPress= 0

16
	curPos=w/2

17
	bullet=false

18
	hPos=h-4

19
	bulletCurPos=0

20
	gameTimer=0

21
	alienW = 5

22
	alienH = 2

23
	alienLeftStop=2

24
	alienRightStop=8

25
	lives=3

26
	killed= false

27
	killCounter=0

28
	noBombs=true

29
	bombTimer=0

30
	win=false

31
	score=0

32
33
	alien1 = true

34
	alien2 = true

35
	alien3 = true

36
	alien4 = true

37
	alien5 = true

38
	alien6 = true

39
	

40
41
	bomb1=false

42
	bomb2=false

43
	bomb3=false

44
45
46
	alienCount=6

47
end

48
49
function clear()

50
	  term.clear()

51
	  term.setCursorPos(1,1)

52
	  term.setBackgroundColour(colours.black)

53
	  term.setTextColour(colours.white)

54
end

55
56
function gameController()

57
	local alienMove=1

58
	local gameTimer = os.startTimer(0.1)

59
	repeat

60
		

61
		local event,p1,p2,p3 = os.pullEvent()

62
		if event=="key" and killed == false then

63
			keyPress=p1

64
			keyAction()

65
		elseif event=="timer" then

66
			

67
			if noBombs==true then 

68
				bombTimer = bombTimer+1

69
				if bombTimer==30 then

70
					noBombs=false

71
					bombTimer=0

72
				end

73
			end

74
			bombs()

75
			

76
			if killed==true then 

77
				killCounter=killCounter+1

78
					if killCounter==10 then

79
						killed=false

80
						curPos=w/2

81
						killCounter=0

82
						drawShip(curPos)

83
					end

84
			end

85
			

86
			term.setTextColour(colours.white)

87
			term.setCursorPos(1,1)

88
			--print("p1:        "..p1.."  ")

89
			term.setCursorPos(1,2)

90
			--print("gameTimer: "..gameTimer.."  ")

91
			term.setCursorPos(1,3)

92
			--print("hPos: "..hPos.."  ")

93
			if p1== gameTimer then

94
			gameTimer=os.startTimer(0.1)

95
			

96
				if bullet==true then

97
					delBullet()

98
					hPos=hPos-1

99
					if hPos==alienH or HPos==alienH+1 then

100
						--checkBulletCollision

101
						if alien1 == true and bulletCurPos >= alienW and bulletCurPos <= alienW+3 then

102
							delAlien(alienW,alienH)

103
							alien1=false

104
							alienCount=alienCount-1

105
							score=score+50

106
							bullet=false

107
						elseif alien2 == true and bulletCurPos >= alienW+8 and bulletCurPos <= alienW+11 then

108
							delAlien(alienW+8,alienH)

109
							alien2=false

110
							alienCount=alienCount-1

111
							score=score+50

112
							bullet=false

113
						elseif alien3 == true and bulletCurPos >= alienW+16 and bulletCurPos <= alienW+19 then

114
							delAlien(alienW+16,alienH)

115
							alien3=false

116
							alienCount=alienCount-1

117
							score=score+50

118
							bullet=false

119
						elseif alien4 == true and bulletCurPos >= alienW+24 and bulletCurPos <= alienW+27 then

120
							delAlien(alienW+24,alienH)

121
							alien4=false

122
							alienCount=alienCount-1

123
							score=score+50

124
							bullet=false

125
						elseif alien5 == true and bulletCurPos >= alienW+32 and bulletCurPos <= alienW+35 then

126
							delAlien(alienW+32,alienH)

127
							alien5=false

128
							alienCount=alienCount-1

129
							score=score+50

130
							bullet=false

131
						elseif alien6 == true and bulletCurPos >= alienW+40 and bulletCurPos <= alienW+43 then

132
							delAlien(alienW+40,alienH)

133
							alien6=false

134
							alienCount=alienCount-1

135
							score=score+50

136
							bullet=false

137
						end

138
						

139
						

140
						if alienCount==0 then 

141
							win=true

142
							gameOver()

143
						end

144
					end

145
					if hPos<=1 then 

146
						bullet=false

147
					else

148
						drawBullet()

149
					end

150
				end

151
				

152
				if  score <0 then score = 0 end

153
				term.setCursorPos(w-10,h)

154
				term.setTextColour(colours.white)

155
				write("Score: "..score)

156
				

157
				delAlienFormation()

158
				alienW=alienW+alienMove

159
				if alien1==false then alienLeftStop = -6 end

160
				if alien1==false and alien2==false then alienLeftStop = -14 end

161
				if alien1==false and alien2==false and alien3==false then alienLeftStop = -22 end

162
				if alien1==false and alien2==false and alien3==false and alien4==false then alienLeftStop = -30 end

163
				if alien1==false and alien2==false and alien3==false and alien4==false and alien5 ==false then alienLeftStop = -38 end

164
				if alien6==false then alienRightStop = 16 end

165
				if alien6==false and alien5==false then alienRightStop = 24 end

166
				if alien6==false and alien5==false and alien4==false then alienRightStop = 32 end

167
				if alien6==false and alien5==false and alien4==false and alien3==false then alienRightStop = 40 end

168
				if alien6==false and alien5==false and alien4==false and alien3==false and alien2 ==false then alienRightStop = 48 end

169
				

170
				if alienW> alienRightStop and alienMove ==1 then alienMove= -1 end -- 8

171
				if alienW < alienLeftStop and alienMove == -1 then alienMove= 1 end -- 2

172
				drawAlienFormation()

173
				

174
				

175
			end

176
		end

177
		

178
		

179
	until event=="char" and p1==("x")  

180
end

181
182
function getKey()

183
	input=read()

184
	print(input.." = "..keys.getName(input))

185
end

186
187
function keyAction()

188
	if keyPress == 30 or keyPress == 203 then

189
		--left - a or left arrow

190
		delShip(curPos)

191
		if curPos>5 then 

192
			curPos=curPos-1

193
		end

194
		drawShip(curPos)

195
	elseif keyPress == 32 or keyPress == 205 then

196
		--right - d or right arrow

197
		delShip(curPos)

198
		if curPos < w-3 then 

199
			curPos=curPos+1

200
		end

201
		drawShip(curPos)

202
	elseif keyPress == 57 then

203
		-- fire - space bar

204
		if bullet==false then

205
			hPos=h-4

206
			bullet=true

207
			bulletCurPos = curPos

208
			drawBullet()

209
		end

210
	elseif keyPress == 16 then

211
		quit()

212
	end

213
end

214
215
function quit()

216
	os.shutdown()

217
end

218
219
function drawShip(wPos)

220
	term.setTextColour(colours.white)

221
	term.setBackgroundColour(colours.white)

222
	term.setCursorPos(wPos,h-3)

223
	print("X")

224
	term.setCursorPos(wPos-1,h-2)

225
	print("XXX")

226
	term.setCursorPos(wPos-2,h-1)

227
	print("XXXXX")

228
	term.setBackgroundColour(colours.black)

229
end

230
231
function delShip(wPos)

232
	term.setTextColour(colours.red)

233
	term.setBackgroundColour(colours.black)

234
	term.setCursorPos(wPos,h-3)

235
	print(" ")

236
	term.setCursorPos(wPos-1,h-2)

237
	print("   ")

238
	term.setCursorPos(wPos-2,h-1)

239
	print("     ")

240
	--term.setBackgroundColour(colours.black)

241
end

242
243
function drawBullet()

244
	if bullet==true then

245
		term.setCursorPos(bulletCurPos,hPos)

246
		term.setTextColour(colours.orange)

247
		term.setBackgroundColour(colours.orange)

248
		print("I")

249
		term.setTextColour(colours.white)

250
		term.setBackgroundColour(colours.black)

251
	end

252
end

253
254
function delBullet()

255
	term.setCursorPos(bulletCurPos,hPos)

256
	term.setTextColour(colours.black)

257
	term.setBackgroundColour(colours.black)

258
	print(" ")

259
	term.setTextColour(colours.white)

260
	term.setBackgroundColour(colours.black)

261
end

262
263
function drawAlien(aW,aH,num)

264
	term.setCursorPos(aW,aH)

265
	term.setTextColour(colours.lime)

266
	term.setBackgroundColour(colours.lime)

267
	print(string.rep(num,3))

268
	term.setCursorPos(aW,aH+1)

269
	print(string.rep(num,1))

270
	term.setCursorPos(aW+2,aH+1)

271
	print(string.rep(num,1))

272
	term.setTextColour(colours.white)

273
	term.setBackgroundColour(colours.black)

274
end

275
276
function delAlien(aW,aH)

277
	term.setCursorPos(aW,aH)

278
	term.setTextColour(colours.black)

279
	term.setBackgroundColour(colours.black)

280
	print("   ")

281
	term.setCursorPos(aW,aH+1)

282
	print(" ")

283
	term.setCursorPos(aW+2,aH+1)

284
	print(" ")

285
	term.setTextColour(colours.white)

286
	term.setBackgroundColour(colours.black)

287
end

288
289
function drawAlienFormation()

290
	if alien1==true then drawAlien(alienW,alienH,1) end

291
	if alien2==true then drawAlien(alienW+8,alienH,2) end

292
	if alien3==true then drawAlien(alienW+16,alienH,3) end

293
	if alien4==true then drawAlien(alienW+24,alienH,4) end

294
	if alien5==true then drawAlien(alienW+32,alienH,5) end

295
	if alien6==true then drawAlien(alienW+40,alienH,6) end

296
end

297
298
function delAlienFormation()

299
	if alien1==true then delAlien(alienW,alienH) end

300
	if alien2==true then delAlien(alienW+8,alienH) end

301
	if alien3==true then delAlien(alienW+16,alienH) end

302
	if alien4==true then delAlien(alienW+24,alienH) end

303
	if alien5==true then delAlien(alienW+32,alienH) end

304
	if alien6==true then delAlien(alienW+40,alienH) end

305
end

306
307
function drawBomb(bombW,bombH)

308
	term.setCursorPos(bombW+1,bombH+2)

309
	term.setBackgroundColour(colours.yellow)

310
	term.setTextColour(colours.yellow)

311
	print("*")

312
	term.setBackgroundColour(colours.black)

313
	term.setTextColour(colours.white)

314
end

315
316
function delBomb(bombW,bombH)

317
	term.setCursorPos(bombW+1,bombH+2)

318
	term.setBackgroundColour(colours.black)

319
	term.setTextColour(colours.black)

320
	print(" ")

321
	term.setBackgroundColour(colours.black)

322
	term.setTextColour(colours.white)

323
end

324
325
function createBomb()

326
	chance = math.random(5)

327
	if chance==1 then 

328
		return true

329
	else 

330
		return false

331
	end

332
end

333
334
function selectAlien()

335
	selAlien= math.random(6)

336
	--term.setCursorPos(1,8)

337
	--term.setTextColour(colours.white)

338
	--print("aliens left "..alienCount)

339
	--term.setCursorPos(1,9)

340
	if selAlien==1 and alien1== true then bombW=alienW

341
	elseif selAlien==2 and alien2== true then bombW=alienW+8

342
	elseif selAlien==3 and alien3== true then bombW=alienW+16

343
	elseif selAlien==4 and alien4== true then bombW=alienW+24

344
	elseif selAlien==5 and alien5== true then bombW=alienW+32

345
	elseif selAlien==6 and alien6== true then bombW=alienW+40

346
	end

347
end

348
349
function bombs()

350
	if bomb1==false and createBomb() == true and noBombs == false then

351
		selectAlien()

352
		drawBomb(bombW,alienH)

353
		bomb1=true

354
		bomb1W= bombW

355
		bomb1H=alienH

356
	elseif bomb1 ==true then 

357
		delBomb(bomb1W,bomb1H)

358
		bomb1H = bomb1H+1

359
		if bomb1H ==14 and bomb1W == curPos then

360
			bomb1=false

361
			shipHit()

362
		elseif bomb1H == 15 and bomb1W >= curPos-2 and bomb1W <= curPos then

363
			bomb1=false

364
			shipHit()

365
		elseif bomb1H == 16 and bomb1W >= curPos-4 and bomb1W <= curPos+1 then

366
			bomb1=false

367
			shipHit()

368
		elseif bomb1H > 16 then

369
			bomb1=false

370
			term.setCursorPos(1,10)

371
	print("   ")

372
		else

373
		    drawBomb(bomb1W,bomb1H)

374
		end

375
	end	

376
	if bomb2==false and createBomb() == true and noBombs == false then

377
		selectAlien()

378
		drawBomb(bombW,alienH)

379
		bomb2=true

380
		bomb2W= bombW

381
		bomb2H=alienH

382
	elseif bomb2 ==true then 

383
		delBomb(bomb2W,bomb2H)

384
		bomb2H = bomb2H+1

385
		if bomb2H ==14 and bomb2W == curPos then

386
			bomb2=false

387
			shipHit()

388
		elseif bomb2H == 15 and bomb2W >= curPos-2 and bomb2W <= curPos then

389
			bomb2=false

390
			shipHit()

391
		elseif bomb2H == 16 and bomb2W >= curPos-4 and bomb2W <= curPos+1 then

392
			bomb2=false

393
			shipHit()

394
		elseif bomb2H > 16 then

395
			bomb2=false

396
			term.setCursorPos(1,10)

397
	print("   ")

398
		else

399
		    drawBomb(bomb2W,bomb2H)

400
		end

401
	end	

402
	if bomb3==false and createBomb() == true and noBombs == false then

403
		selectAlien()

404
		drawBomb(bombW,alienH)

405
		bomb3=true

406
		bomb3W= bombW

407
		bomb3H=alienH

408
	elseif bomb3 ==true then 

409
		delBomb(bomb3W,bomb3H)

410
		bomb3H = bomb3H+1

411
		if bomb3H ==14 and bomb3W == curPos then

412
			bomb3=false

413
			shipHit()

414
		elseif bomb3H == 15 and bomb3W >= curPos-2 and bomb3W <= curPos then

415
			bomb2=false

416
			shipHit()

417
		elseif bomb3H == 16 and bomb3W >= curPos-4 and bomb3W <= curPos+1 then

418
			bomb3=false

419
			shipHit()

420
		elseif bomb3H > 16 then

421
			bomb3=false

422
			term.setCursorPos(1,10)

423
	print("   ")

424
		else

425
		    drawBomb(bomb3W,bomb3H)

426
		end

427
	end

428
end

429
430
function shipHit()

431
	lives=lives-1

432
	delShip(curPos)

433
	killed=true

434
	noBombs=true

435
	score=score-10

436
	if score<0 then score =0 end

437
	if lives==0 then

438
		gameOver()

439
	else

440
		term.setCursorPos(2,h)

441
		term.setTextColour(colours.white)

442
		write("Lives: "..lives)

443
		term.setCursorPos(w-10,h)

444
		term.setTextColour(colours.white)

445
		write("Score: "..score)

446
	end

447
end

448
449
function gameOver()

450
	clear()

451
	if win==true then

452
		term.setCursorPos((w/2)-3, h/2)

453
		print("YOU WIN")

454
		win=false

455
	else

456
		term.setCursorPos((w/2)-4, h/2)

457
		print("GAME OVER")

458
	end

459
	local scoreStr= tostring(score)

460
	term.setCursorPos((w/2)-((7+#scoreStr))/2, (h/2)+2)

461
	print("Score: "..scoreStr)

462
	sleep(1)

463
	term.setCursorPos((w/2)-9, (h/2)+5)

464
	print("Play again (Y or N)")

465
	

466
467
	while true do

468
		local event,p1,p2,p3 = os.pullEvent()

469
		if event=="char" then

470
			if string.lower(p1)=="y" then 

471
				runGame()

472
			elseif string.lower(p1)=="n" then 

473
				os.shutdown()

474
			end

475
		end

476
	end

477
478
end

479
480
481
482
function runGame()

483
	clear()

484
	

485
	initVariables()

486
	drawShip(curPos)

487
	drawAlienFormation()

488
489
	term.setCursorPos(2,h)

490
	write("Lives: "..lives)

491
	term.setCursorPos(w-10,h)

492
	write("Score: "..score)

493
494
	gameController()

495
end

496
497
function line1(h)

498
	term.setCursorPos(12,h) write("    ")

499
	term.setCursorPos(18,h) write("    ")

500
	term.setCursorPos(24,h) write("    ")

501
	term.setCursorPos(30,h) write("    ")

502
	term.setCursorPos(36,h) write("    ")

503
end

504
505
506
function line2(h)

507
	term.setCursorPos(12,h) write(" ")

508
	term.setCursorPos(18,h) write(" ")

509
	term.setCursorPos(21,h) write(" ")

510
	term.setCursorPos(24,h) write(" ")

511
	term.setCursorPos(27,h) write(" ")

512
	term.setCursorPos(30,h) write(" ")

513
	term.setCursorPos(36,h) write(" ")

514
end	

515
	

516
function line3(h)

517
	term.setCursorPos(12,h) write("    ")

518
	term.setCursorPos(18,h) write("    ")

519
	term.setCursorPos(24,h) write("    ")

520
	term.setCursorPos(30,h) write(" ")

521
	term.setCursorPos(36,h) write("   ")

522
end

523
524
function line4(h)

525
	term.setCursorPos(15,h) write(" ")

526
	term.setCursorPos(18,h) write(" ")

527
	term.setCursorPos(24,h) write(" ")

528
	term.setCursorPos(27,h) write(" ")

529
	term.setCursorPos(30,h) write(" ")

530
	term.setCursorPos(36,h) write(" ")

531
end

532
	

533
function line5(h)

534
	term.setCursorPos(12,h) write("    ")

535
	term.setCursorPos(18,h) write(" ")

536
	term.setCursorPos(24,h) write(" ")

537
	term.setCursorPos(27,h) write(" ")

538
	term.setCursorPos(30,h) write("    ")

539
	term.setCursorPos(36,h) write("    ")

540
end

541
	

542
	

543
function line6(h)

544
	term.setCursorPos(4,h) write("   ")

545
	term.setCursorPos(9,h) write(" ")

546
	term.setCursorPos(12,h) write(" ")

547
	term.setCursorPos(15,h) write(" ")

548
	term.setCursorPos(18,h) write(" ")

549
	term.setCursorPos(21,h) write("    ")

550
	term.setCursorPos(27,h) write("   ")

551
	term.setCursorPos(33,h) write("    ")

552
	term.setCursorPos(39,h) write("   ")

553
	term.setCursorPos(45,h) write("    ")

554
end

555
556
function line7(h)

557
	term.setCursorPos(5,h) write(" ")

558
	term.setCursorPos(9,h) write("  ")

559
	term.setCursorPos(12,h) write(" ")

560
	term.setCursorPos(15,h) write(" ")

561
	term.setCursorPos(18,h) write(" ")

562
	term.setCursorPos(21,h) write(" ")

563
	term.setCursorPos(24,h) write(" ")

564
	term.setCursorPos(27,h) write(" ")

565
	term.setCursorPos(30,h) write(" ")

566
	term.setCursorPos(33,h) write(" ")

567
	term.setCursorPos(39,h) write(" ")

568
	term.setCursorPos(42,h) write(" ")

569
	term.setCursorPos(45,h) write(" ")

570
end

571
	

572
function line8(h)

573
	term.setCursorPos(5,h) write(" ")

574
	term.setCursorPos(9,h) write("    ")

575
	term.setCursorPos(15,h) write(" ")

576
	term.setCursorPos(18,h) write(" ")

577
	term.setCursorPos(21,h) write("    ")

578
	term.setCursorPos(27,h) write(" ")

579
	term.setCursorPos(30,h) write(" ")

580
	term.setCursorPos(33,h) write("   ")

581
	term.setCursorPos(39,h) write("   ")

582
	term.setCursorPos(45,h) write("    ")

583
end

584
585
586
function line9(h)

587
	term.setCursorPos(5,h) write(" ")

588
	term.setCursorPos(9,h) write(" ")

589
	term.setCursorPos(11,h) write("  ")

590
	term.setCursorPos(15,h) write(" ")

591
	term.setCursorPos(18,h) write(" ")

592
	term.setCursorPos(21,h) write(" ")

593
	term.setCursorPos(24,h) write(" ")

594
	term.setCursorPos(27,h) write(" ")

595
	term.setCursorPos(30,h) write(" ")

596
	term.setCursorPos(33,h) write(" ")

597
	term.setCursorPos(39,h) write(" ")

598
	term.setCursorPos(42,h) write(" ")

599
	term.setCursorPos(48,h) write(" ")

600
end	

601
	

602
function line10(h)

603
	term.setCursorPos(4,h) write("   ")

604
	term.setCursorPos(9,h) write(" ")

605
	term.setCursorPos(12,h) write(" ")

606
	term.setCursorPos(16,h) write("  ")

607
	term.setCursorPos(21,h) write(" ")

608
	term.setCursorPos(24,h) write(" ")

609
	term.setCursorPos(27,h) write("   ")

610
	term.setCursorPos(33,h) write("    ")

611
	term.setCursorPos(39,h) write(" ")

612
	term.setCursorPos(42,h) write(" ")

613
	term.setCursorPos(45,h) write("    ")

614
end

615
616
function whiteScreen()

617
	term.setBackgroundColour(colours.white)

618
	term.clear()

619
	term.setBackgroundColour(colours.black)

620
end

621
	

622
function splashScreen()

623
	whiteScreen()

624
	sleep(1)

625
626
	local scrollH = h+2

627
	while scrollH > 1 do

628
		whiteScreen()

629
		line1(scrollH)

630
		line2(scrollH+1)

631
		line3(scrollH+2)

632
		line4(scrollH+3)

633
		line5(scrollH+4)

634
		scrollH=scrollH-1

635
		sleep(0.1)

636
	end

637
	local scrollH = h+2

638
	while scrollH > 1 do

639
		whiteScreen()

640
		line1(2)

641
		line2(3)

642
		line3(4)

643
		line4(5)

644
		line5(6)

645
		line6(scrollH+6)

646
		line7(scrollH+7)

647
		line8(scrollH+8)

648
		line9(scrollH+9)

649
		line10(scrollH+10)

650
		scrollH=scrollH-1

651
		sleep(0.1)

652
	end

653
	term.setBackgroundColour(colours.white)

654
	term.setTextColour(colours.black)

655
	

656
	term.setCursorPos((w/2)-6,15)

657
	print("by Jcdwalel and PumpkinheadAbbey")

658-
	print("by fredTHead")

658+
659
	term.setCursorPos((w/2)-15,17)

660
	print("Left and Right Arrows to move")

661
	term.setCursorPos((w/2)-6,18)

662
	print("Space to fire")

663
	

664
	term.setCursorPos((w/2)-10,19)

665
	write("Press fire when ready")

666
	

667
	

668
	

669
	while true do

670
		local event,p1,p2,p3 = os.pullEvent()

671
		if event=="char" then

672
			term.setBackgroundColour(colours.black)

673
			term.clear()

674
			runGame()

675
		end  

676
	end

677
end

678
679
680
681
monSign()

682
clear()

683
684
term.setCursorPos(w/2-6 ,h/2)

685
print("Press any key")

686
while true do

687
	local event,p1,p2,p3 = os.pullEvent()

688
	if event=="char" then

689
		splashScreen()

690
	end  

691
end
        

    


            


                                


        

            



                
    

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