Making A.I shoot back?

[Retro Lord]

I'm a bit lost on this one. I'm trying to figure out how to make the a.i fire at the player depending on if the player is left or right to the a.i

 

I basically tried something like this, but that don't work at all:

 if d=0 then missile1x=player1x : missile1y=player1y
 if d=1 then missile1x=missile1x+1
 if d=2 then missile1x=missile1x-1

 if player0x<player1x then d=2
 if player0x<player1x then d=1
 if missile1x<10 then d=0
 if missile1x>135 then d=0

[ultima]

Would this help?

 dim fire = a
 c{1}=0
 c{2}=0
 player1x = 50 : player1y = 50
 player0x = 70 : player0y = 50
 e=60
 fire = 0
loop
   COLUBK = $00 : COLUP1= $5A : COLUP0= $0A
 if joy0up then player0y = player0y - 1
 if joy0down then player0y = player0y + 1
 if joy0left then player0x = player0x - 1              
 if joy0right then player0x = player0x + 1
 if player0x > player1x then fire = 1 : c=%00000010
 if  player0x < player1x then fire = 1 : c=%00000001
 if fire = 1 && c{0} then missile1x = player1x - e : missile1y = player1y - 1
 if fire = 1 && c{1} then missile1x = player1x + 1 + e : missile1y = player1y - 1
 if e>60 then e=0 : fire = 0 : missile1x = 0 : missile1y = 0
 e=e+1
 player1:
 %00000000
 %00000000
 %00000000
 %00111100
 %01111110
 %00000000
 %01111110
 %00011000
end
 player0:
 %11100000
end
 drawscreen
 goto loop 

spaceship code.bas.bin

Edited February 19, 2015 by ultima

[ZackAttack]

You forgot to change the caparison for setting d=1. You should also add a check for d=0 before setting d to 1 or 2. Otherwise the missle will change directions mid flight.

[Retro Lord]

Cheers for the help guys, you are the best =)