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Calculator Community => TI Calculators => Axe => Topic started by: collechess on November 02, 2011, 07:26:01 pm

Title: Tilemap Collisions
Post by: collechess on November 02, 2011, 07:26:01 pm

How do you create exact tilemap collisions in Axe?  My routine to access the value of a tile divides x and y by 4, which is the size of each tile, but means that there is only a collision if it overlaps on the right or is exactly aligned.  It does not register collisions on the left.  How can I register a collision on any overlap?

Title: Re: Tilemap Collisions
Post by: C0deH4cker on November 02, 2011, 10:29:53 pm

Dont test for pixels. If youre moving to the right, check if there's a solid tile that is one tile to the right. if not, then keep moving.

Title: Re: Tilemap Collisions
Post by: Keoni29 on November 04, 2011, 04:03:33 am

This:

Quote from: Keoni29 on November 02, 2011, 04:19:13 pm

Quote from: Eiyeron on October 31, 2011, 12:48:18 pm

but collision s the most complicated!, Damn!

Tile based works perfectly. I use this:

Code: [Select]

:If getKey(2) and (X≠0)
:sub(CC,X,Y,X,Y+7
:!If R
:X-1→X
:End
:End
Just to check for a tile on the left. Now you figure out how to check for tiles in the other 3 directions :)

Code: [Select]

:Lbl CC
:{r2/8*12+(r1/8)+GDB1}→r5
:{r4/8*12+(r3/8)+GDB1}→r6
:r5+r6→R
:Return


Title: Re: Tilemap Collisions
Post by: LincolnB on November 04, 2011, 10:22:19 am

Changed for prettification and I think also speed gain:

Code: [Select]

:If getKey(2)
:If X
:!If CC(X,Y,X,Y+7)
:X--
:End
:End
:End
:
:
:Lbl CC
:{r2/8*12+(r1/8)+GDB1}→r5
:{r4/8*12+(r3/8)+GDB1}→r6
:r5+r6→R
:Return

I just love function based programming so much :)

Title: Re: Tilemap Collisions
Post by: Keoni29 on November 04, 2011, 12:32:08 pm

Quote from: buttsfredkin on November 04, 2011, 10:22:19 am

Changed for prettification and I think also speed gain:

Code: [Select]

:If getKey(2)
:If X
:!If CC(X,Y,X,Y+7)
:X--
:End
:End
:End
:
:
:Lbl CC
:{r2/8*12+(r1/8)+GDB1}→r5
:{r4/8*12+(r3/8)+GDB1}→r6
:r5+r6→R
:Return

I just love function based programming so much :)

And so do I :D

Title: Re: Tilemap Collisions
Post by: aeTIos on November 04, 2011, 12:42:01 pm

uhh, a full commitment what I'm thinking of ?
lol.

Title: Re: Tilemap Collisions
Post by: flyingfisch on November 04, 2011, 12:43:32 pm

could someone please show me how to do this in lua?

Title: Re: Tilemap Collisions
Post by: LincolnB on November 04, 2011, 10:13:47 pm

Flyingfisch, I would ask that question in a new thread in a different forum.

Title: Re: Tilemap Collisions
Post by: Keoni29 on November 05, 2011, 03:17:13 pm

Quote from: flyingfisch on November 04, 2011, 12:43:32 pm

could someone please show me how to do this in lua?

Same principle, but a different syntax :)

Title: Re: Tilemap Collisions
Post by: collechess on November 06, 2011, 05:42:17 pm

If I have 4x4 tiles, I should change the /8 to /4 right?  What does the x12 do?

Title: Re: Tilemap Collisions
Post by: Darl181 on November 06, 2011, 05:50:37 pm

I'm guessing the *12 was because in an 8*8-tile map, it's 12 tiles wide.  For a 4*4-tile map it's 24 tiles wide.