Author Topic: Help with tilemap collision? (Read 8945 times)

LincolnB · « **Reply #15 on:** January 11, 2012, 05:02:11 pm »

haha that's totally fine. Everyone forgets these things, most especially me.

thydowulays · « **Reply #16 on:** January 11, 2012, 05:46:41 pm »

Wait, I have a question. If I had the routine GT, with {r2/8*12+(r1/8)+GBD1}=r3, and I did this:
If sub(GT,X,Y-8,2)
End
Would that test to see if the tile had a number 02? Like I could do this:
If sub(GT,X,Y-8,2)
Y-8->Y
Pause 500
End
ElseIf sub(GT,X,Y-8,3)
Pause 500
End

Nevermind, I got it. However, does anyone know a routine to say, move a tile up or down, or left or right? Like, edit the little [01000000000000001]->GBD1 sorta thing via a routine in game?
That would make it so I could move through tile 02, but not tile 03. Would that work?

LincolnB · « **Reply #17 on:** January 12, 2012, 05:44:27 pm »

yes, but you'll want to make a copy of your map data and modify that, so you don't screw up your map for permanent.

To acces the Yth element down and the Xth element across, go like this:

{Y*WIDTH_OF_MAP + X + START_OF_MAP_DATA}

So, to move a tile to the left, say:

Code: [Select]

{Y*WIDTH_OF_MAP + X + START_OF_MAP_DATA}->{Y*WIDTH_OF_MAP + X-1 + START_OF_MAP_DATA}

And so on

C0deH4cker · « **Reply #18 on:** January 12, 2012, 06:13:41 pm »

In my programs where I want to edit my maps, I first copy the maps to L1 or some other free ram area during level loading. I usually have three map functions:

Code: [Select]

DrawMap(mapPtr, tilePics)
GetTile(mapPtr, x, y) .x and y are actual screen coords. Function just divides each by 8 to get the tile that contains the point specified.
SetTile(mapPtr, row, col, value)

Then you can access and modify your map very easily.

parserp · « **Reply #19 on:** January 25, 2012, 06:09:49 pm »

hmmm, I can't think of a good way to erase a tile from the map. Is there a fast way to draw it every frame?
Every way that I've tried it, it is too slow. $:-\$

thydowulays · « **Reply #20 on:** January 25, 2012, 09:42:04 pm »

Parser, to erase an individual tile from the map, you basically take leafy's routine:

Code: [Select]

Lbl GT
{r2/8*12+(r1/8)+GDB1}
Return

And turn it into this:

Code: [Select]

Lbl ST
{r2/8*12+(r1/8)+GDB1}->r3
Return

Then, you would just have to do ST(X,Y,0 and the tile at position X,Y will be converted into 00.
What do you mean by fast drawing?

EDIT: Leveled up! W00t!

leafy · « **Reply #21 on:** January 25, 2012, 10:01:13 pm »

Did you mean:

Code: [Select]

Lbl ST
r3->{r2*12+r1+GDB1}
Return

Also I think he meant actually erasing the tile from the screen. Parser you can do that by drawing a Rect( and a RectI( at the coordinates of the tile.

Quigibo · « **Reply #22 on:** January 25, 2012, 10:14:01 pm »

Quote from: leafiness0 on January 25, 2012, 10:01:13 pm

Also I think he meant actually erasing the tile from the screen. Parser you can do that by drawing a Rect( and a RectI( at the coordinates of the tile.

...or a single Pt-Off() if the tile is 8x8. If its smaller than 8x8 you can use Pt-Mask()r to erase and redraw the new tile just like Pt-Off().

parserp · « **Reply #23 on:** January 25, 2012, 10:34:41 pm »

actually yes, I was referring to physically erasing a tile from the buffer. I'll try trying using 'Rect' and 'Pt-Mask'. Thanks guys!

Eiyeron · « **Reply #24 on:** February 08, 2012, 05:19:35 am »

Just a little optimisation:

x+1->x

Becomes:

x++

Same with x--

But is faster

Code: [Select]

getKey(4)?Y--
End

than?

Code: [Select]

If getKey(4)
Y-1->Y
End

i think there should be many bytes and cycles won, but not much

kindermoumoute · « **Reply #25 on:** February 08, 2012, 07:03:44 am »

Quote from: Eiyeron on February 08, 2012, 05:19:35 am

But is faster
Code: [Select]
getKey(4)?Y-- End
than?
Code: [Select]
If getKey(4) Y-1->Y End

Nope, that's the same.

Eiyeron · « **Reply #26 on:** February 08, 2012, 03:29:39 pm »

Really? I thought that would be faster, or lighter...

hellninjas · « **Reply #27 on:** February 08, 2012, 03:30:32 pm »

This has been alot of help!

Eiyeron · « **Reply #28 on:** February 08, 2012, 03:31:55 pm »

You'r welcome!

Author Topic: Help with tilemap collision? (Read 8945 times)

LincolnB

Re: Help with tilemap collision?

thydowulays

Re: Help with tilemap collision?

LincolnB

Re: Help with tilemap collision?

C0deH4cker

Re: Help with tilemap collision?

parserp

Re: Help with tilemap collision?

thydowulays

Re: Help with tilemap collision?

leafy

Re: Help with tilemap collision?

Quigibo

Re: Help with tilemap collision?

parserp

Re: Help with tilemap collision?

Eiyeron

Re: Help with tilemap collision?

kindermoumoute

Re: Help with tilemap collision?

Eiyeron

Re: Help with tilemap collision?

hellninjas

Re: Help with tilemap collision?

Eiyeron

Re: Help with tilemap collision?