Automatically Aligning the Player with Ladders

[Jonathan Cauldwell]

Here's some quick code to align the player when going up ladders

IF KEY 0
 IF LADDERABOVE
   LET IMAGE = 0
   ANIMATE
   SPRITEUP
 ELSE
   SPRITELEFT
   IF LADDERABOVE
     ANIMATE
   ELSE
     SPRITERIGHT
     SPRITERIGHT
     IF LADDERABOVE
       ANIMATE
     ELSE
       SPRITELEFT
     ENDIF
   ENDIF
 ENDIF
ENDIF

This gives the player a couple of pixels leeway either side of a ladder. You may also want to set a flag to disable normal left/right movement whenever the sprite aligns with a ladder.

Obviously, the code for aligning the player with a ladder below would be similar. Replace KEY 0 with KEY 1, LADDERABOVE with LADDERBELOW and SPRITEUP with SPRITEDOWN.

[gabriele1969]

Hi
one thing I discovered is that if you put a solid wall block at the side of the ladder you don't need any alignment
(i mean you don't need to write any extra code)
just a simple "if ladder above etc etc" will do
I used this little trick in Pitfall III and it worked allright
I don't know in the end if it saves memory (i mean in the general memory balance) but at least it saves some memory from the RAM editor...