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Sonic =>
Your Projects
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John Barrus
Member
Joined: 25 May 2003
Posts: 131
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 Posted: 16 Jul 2003 01:05:19 pm Post subject: |
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Collisions would be harder to detect than if this was an aligned map routine. Since the routine is smooth scrolling, what is on the screen isn't always an accurate representation of what the tile map is in relation to the pointer. (At most, it would be 7 pixels (bits) off). By providing some sort of offset to every sprite displayed on the screen, we can detect collisions.
I talked with Patrick D and others, they said that it would work. Just don't ask me how to do it, I haven't figured out yet. |
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james
Member
Joined: 25 May 2003
Posts: 114
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| Posted: 17 Jul 2003 10:09:21 am Post subject: |
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John- do u mind sending me something that u have done with the engine.
my email is in the sonic forum sdomewhere if u dont know it |
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Tyler
Advanced Member
Joined: 29 May 2003
Posts: 352
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| Posted: 17 Jul 2003 10:59:55 am Post subject: |
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| Unless you made the sprites 8x8 or 16x16 and all the other sprites were 8x8 or 16x16, then you could just look at the array without any errors, right? |
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Tyler
Advanced Member
Joined: 29 May 2003
Posts: 352
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| Posted: 17 Jul 2003 11:03:16 am Post subject: |
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BTW - I have an example from MaxCoderz for along time ago to check the tile thats currently at x,y
Heres the code, I didn't write it! Someone from MaxCoderz did probably, but it wasn't me
Code:
;==========================================================
; mapGetTile(h=x,l=y)
;==========================================================
;returns value of (h,l) on map
;destroys de
mapGetTile:
push hl
push hl
ld h,0
add hl,hl
add hl,hl
add hl,hl
add hl,hl
add hl,hl
add hl,hl
add hl,hl;*128 (=mapWidth)
pop de
ld e,d
ld d,0
add hl,de
ld de,(mapAdress)
add hl,de
ld a,(hl)
pop hl
ret
Theres also another nice package for screen scrolling things there. The only disadvantage is you'll have to impelment graystyle if you ever decide to use it. Tell me if you can't find it, it's something called 'FastMap'. It's exactly what you guys need and it even has smooth scrooling /w object detection!  |
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John Barrus
Member
Joined: 25 May 2003
Posts: 131
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| Posted: 18 Jul 2003 12:18:59 am Post subject: |
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James- I'll send you the source so far. Don't be to impressed. it's nothing. It just tests out the scrolling methods used, and it doesn't copy the next row-column in yet. I figure we have to write a whole new tilemap routine anyway, so I don't want to do anything more with the current source. I just wanted to see that I can do it.
Tyler- The sprites will be 8x8 and 16x16, but detecting collisions will be a little harder than using that gettile routine. As I said, we will have to use some sort of tile offsetting routine that will read from the map and then add an offset (depending on how far the screen is scrolled) to get the true position of the sprite relative to the screen.
I'm sure I'll probably look at the source of that Fastmap thing you speak of. It may prove handy. |
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james
Member
Joined: 25 May 2003
Posts: 114
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| Posted: 18 Jul 2003 05:02:16 pm Post subject: |
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Ok john,i finally got to see what you have so far...and its great,i know you are still working with it,like the re drawing and also with the speed but its good.
keep up the good work 
the sprite u sent was good by the way
im going to show some more of what i have done in a little bit,dont expect anything to good |
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John Barrus
Member
Joined: 25 May 2003
Posts: 131
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| Posted: 19 Jul 2003 04:26:53 am Post subject: |
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| Great. As I said, I'll write a whole new tile-map routine over the weekend, (it'll have support for any size of maps) and then I'll work on scrolling it. Hopefully it will be better than most of the stuff I've seen already. |
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