Vertical Scroller

[DrewPee]

Could anybody help me with a vertical scroller routine using tinyptc please?

I have done a scroller of sorts but really really not happy about it! 

Would it also be possible to enable a zoom function into this as well?

i.e. if a character is 8 pixels by 8 pixels (as my spectrum font is . . .) could i make this say 64 x 64 pixels instead (I know it would look blocky but this is something I have an idea for!).

Can anybody help me with this one please?

Thanks in anticipation . . .

Drew

[DrewPee]

Erm . . . ive just sorted out a vertical scroller (of sorts) now!!! lol!!!

I could do with help on the other matter though please?

Drew

[Jim]

If you're just using PTC and drawing pixels, then it's just a case of repeating each source pixel many times.
You might have

Code Select Expand


for y=0 to srcy-1
for x=0 to srcx-1
  pix = srcgfx[x+y*srcx]
  for h=0 to yscale-1
   for w=0 to xscale-1
    screen[dstx+w+(dsty+h)*SCREENWIDTH]=pix
   next
  next
  dstx += xscale
next
dstx -= srcx*xscale
dsty += yscale
next


Where xscale and yscale are the x and y repeat counts, so you might want 8 and 8 for a 64x64 graphic, and dstx, dsty are the screen position of the sprite, scrx and srcy are the source size (8,8), and SCREENWIDTH is the screen width.

(Code untested)

Jim