Horizontally-moving platforms...

[alessandro]

I am trying to implement horizontally-moving platforms in a Manic Miner-style game. So far I came up with this script for the platform sprite (I am using 16x16 sprites):

IF PARAMA = 0
   IF CANGOLEFT
       SPRITELEFT
   ELSE
        LET PARAMA 1
   ENDIF
ELSE
   IF CANGORIGHT
         SPRITERIGHT
   ELSE
        LET PARAMA 0
ENDIF
IF COLLISION 0
   OTHER
   IF CANGODOWN
         SUBTRACT 8 TO X
   ENDIF
ENDIF

It works pretty well, provided that the platform sprite is drawn at or near the top of the 16x16 pixel grid and collision distance is 12 or less, otherwise the main character sprite will seem to float on it.

There is a problem however: the game engine will assume that the main character sprite will be in mid-air when on the platform, therefore pressing the 'jump' key will have no effect until the character does not fall from the platform! Is there a way to enable jumping even in such a condition?

[alessandro]

Coming to think of this, would there be an unofficial way - e.g. a series of ASM command - to let a sprite behave the same way like a platform block? That would solve the issue easily.