I don't understand pfscroll

[Retro Lord]

I find it hard to get a grasp of pfscroll. I can get the playfield to jerk about but that's it. How can I make it scroll up or down properly?

   if joy0up then pfscroll up
   if joy0down then pfscroll down

   if playfieldpos <> 8 then goto __Skip_Draw

   temp5 = rand : temp6 = rand/2

   if temp5 > temp6 then var44 = 0 : var45 = 0 : var46  = 0 : var47 = 0 : goto __Skip_Draw

   var44 = rand : var45 = rand : var46  = rand : var47 = rand

__Skip_Draw

[+Random Terrain]

If you want a constant scroll, try this:

_

   pfhline 8 5 23 on

   COLUBK = $C4
   COLUPF = $CE

__Main_Loop

   pfscroll down

   drawscreen

   goto __Main_Loop

[Retro Lord]

Hm, okay. But what does the numbers mean?

[+Random Terrain]

Hm, okay. But what does the numbers mean?

 

Are you talking about the numbers in pfhline? If you go to the index, scroll down to pfhline and click on it, you can learn all about it. If you are talking about the numbers used with COLUBK and COLUPF, you can do the same thing. Go to the index and scroll down to COLUBK and COLUPF and click on them to learn more about them.

[Retro Lord]

Ah, cool. That cleared it up, thanks!

[Retro Lord]

I have another question related too pfscroll. (I think)

How would I go about if I wanted a racetrack. And I want 3 playfield, one being a straight road, the second being a forked road and the third being something else, and having 1 of them randomly selected and coming in after the current playfield?