TI Basic game: H Fighter

tibasic · April 5, 2021

Hi,

It's been a while since I've written any basic games. This one is a short and simple game inspired by the 1983 Atari Star Wars arcade game. In this game you battle H fighters which are tie fighter-like ships. There is no trench run but I think it's possible to approximate. I might look into if as a separate game. I'm trying to keep my games simple these days.

To score against the h fighters your laser needs to strike them in the centre. In a similar manner for the h fighter to score against you and destroy one of your 5 ships it needs to strike you when it is positioned midway horizontally. The h fighter turns magenta just before it fires its laser. In that way you will hopefully have enough time to manoeuvre out of the way. The keys are ESDX for manoeuvring and spacebar to fire.

The code is in the spoiler and a file for use with Classic99 is attached.

Spoiler

100 CALL CLEAR
110 PRINT " H-FIGHTER"
120 PRINT
130 PRINT "H shaped space fighters"
140 PRINT "fill up your screen and"
150 PRINT "fire their lasers at you"
160 PRINT "avoid them and fire back"
170 PRINT "with your own lasers"
180 PRINT "your score will be printed"
190 PRINT "when 5 of your ships have"
200 PRINT "been destroyed"
210 PRINT "score 10 points by shooting"
220 PRINT "at the centre of a h fighter"
230 PRINT
240 PRINT "keys:"
250 PRINT "E up":"X down":"S left":"D right":"SPACE fire":::
260 PRINT " PRESS ANY KEY TO PLAY"
270 CALL KEY(0,K,S)
280 IF S=0 THEN 270
290 REM initialise
300 T=1
310 X=16
320 Y=0
330 LV=5
340 SC=0
350 REM chars and colours
360 CALL CHAR(128,"00003C3C3C3C0000")
370 CALL CHAR(129,"0000FFFFFFFF0000")
380 CALL CHAR(136,"0000FF0000FF0000")
390 CALL CHAR(144,"C3C3C3C3C3C3C3C3")
400 CALL SCREEN(2)
410 CALL COLOR(13,3,1)
420 CALL COLOR(14,6,1)
430 CALL COLOR(15,7,1)
440 REM start game
450 CALL KEY(0,K,S)
460 IF S=0 THEN 660
470 IF K<>32 THEN 610
480 REM player shoots
490 FOR I=0 TO 2
500 CALL HCHAR(12,I*5+2,136,5)
510 CALL HCHAR(12,26-I*5,136,5)
520 NEXT I
530 IF (Y=0)*(X<19)*(X>14)THEN 550 ELSE 610
540 REM player scores
550 CALL SOUND(300,800,0)
560 CALL SCREEN(16)
570 CALL SCREEN(2)
580 SC=SC+10
590 T=11
600 GOTO 900
610 X=X-(K=68)
620 X=X+(K=83)
630 Y=Y-(K=88)
640 Y=Y+(K=69)
650 IF (X+T>32)+(X-T<1)+(12+Y-T<2)THEN 910 ELSE 660
660 CALL CLEAR
670 REM move h fighter
680 T2=T*2
690 CALL VCHAR(12+Y-0.5*T2,X+T,128,T2)
700 CALL VCHAR(12+Y-0.5*T2,X-T,128,T2)
710 CALL HCHAR(12+Y,X-T+1,129,T2-1)
720 IF (RND>0.8)*(FLAG=0)THEN 740 ELSE 760
730 REM prepare to fire
740 CALL COLOR(13,14,1)
750 FLAG=1
760 IF (RND>0.7)*(FLAG=1)THEN 780 ELSE 890
770 REM h fighter fires
780 CALL VCHAR(12+Y+1,X,144,11-Y)
790 CALL COLOR(13,3,1)
800 FLAG=0
810 IF (X>13)*(X<19)THEN 830 ELSE 890
820 REM h fighter scores
830 LV=LV-1
840 CALL SOUND(300,110,0)
850 CALL SCREEN(3)
860 CALL SCREEN(2)
870 IF LV=0 THEN 960
880 REM increment counter
890 T=T+1
900 IF T<=10 THEN 940
910 T=1
920 X=10+INT(RND*12)
930 Y=-6+INT(RND*12)
940 GOTO 450
950 REM game over
960 CALL CLEAR
970 CALL SCREEN(4)
980 PRINT "SCORE:";SC:::
990 PRINT "PLAY AGAIN (Y/N)?"
1000 CALL KEY(0,K,S)
1010 IF S=0 THEN 1000
1020 IF K=89 THEN 300
1030 IF K=78 THEN 1050
1040 GOTO 1000
1050 END

HFIGHTER.zip

Edited April 5, 2021 by tibasic

tibasic · April 13, 2021

I noticed when I was playing H fighter that sometimes it would cause an bad value. This can be fixed by deleting line 650 and moving it to line 675, i.e. 675 IF (X+T>32)+(X-T<1)+(12+Y-T<2)THEN 910 ELSE 680

Also I made some progress with a game inspired by the trench run part of the Atari Star Wars game. I've called it Laser Gate because in this game you have to fly through a set of gates to score points. I've included the code below in the spoiler if you want to try it by pasting it into Classic99 or js99er.

Spoiler

100 CALL CLEAR
110 PRINT "        LASER GATE"
120 PRINT "        **********"
130 PRINT :::
140 PRINT "    use e and x to steer"::
150 PRINT "   through the laser gates"::
160 PRINT "    and score 10 points"::
170 PRINT ::::::::::
180 INPUT "PRESS ENTER TO PLAY":ENTER$
190 CALL CLEAR
200 Y=1
210 H=0
220 H2=0.8
230 GATE=0
240 CALL CHAR(128,"FFFFFFFFFFFFFFFF")
250 CALL CHAR(136,"FF")
260 CALL SCREEN(2)
270 CALL COLOR(2,2,7)
280 CALL COLOR(13,3,1)
290 CALL COLOR(14,7,1)
300 CALL KEY(0,K,S)
310 IF K=ASC("X")THEN 320 ELSE 330
320 Y=Y-(Y<=10)
330 IF K=ASC("E")THEN 340 ELSE 350
340 Y=Y+(Y>=1)
350 YPOS=24-(T+8)*(10-Y)/10-Y
360 CALL VCHAR(YPOS,16-T,128,T)
370 CALL VCHAR(YPOS,17+T,128,T)
380 CALL HCHAR(YPOS+T*H,17-T,136,2*T)
390 CALL HCHAR(YPOS+T*H2,17-T,136,2*T)
400 CALL HCHAR(17,16,43)
410 T=T+1
420 IF T<>10 THEN 580
430 IF (18>INT(YPOS+T*H))*(18<INT(YPOS+T*H2))THEN 440 ELSE 480
440 SC=SC+10
450 CALL SCREEN(16)
460 CALL SOUND(300,500,0)
470 CALL SOUND(300,1000,0)
480 GATE=GATE+1
490 IF GATE=10 THEN 610
500 CALL SCREEN(2)
510 CALL CLEAR
520 T=0
530 H=RND
540 H2=H+RND*(1.0-H)
550 IF H2-H<0.2 THEN 530
560 CALL COLOR(14,INT(H*10)+3,1)
570 CALL COLOR(14,INT(H*10)+3,1)
580 CALL CLEAR
590 CALL COLOR(2,2,INT(H*10)+3)
600 GOTO 300
610 PRINT "YOUR SCORE IS:";SC