Quote from: yunhua98 on August 02, 2011, 04:03:12 pm

What he said.
the A*8 is indeed because of the 8x8 tiles, and in {Q+B*24+P+A+GDB1}, Q+B*24 is interpreted as (Q+B)*24 because of left to right order of operations.  The width of the map is 24, so to get to the next row, you add 24, in this case, you add Q+B number of rows.  Add one to go one byte to the right, so P and A are added, plus the original pointer, GDB1.

Hem... Is it normal? IRL, or in C, the * operaotr has more priotiy than +...

Axe uses left to right order of operations. I would guess that the number one mistake beginner axe programmers make is forgetting this.

It's a bit of a necro but I'm having some problems with this.
For a level stored column-by-column instead of row-by-row, what changes would be made to the formulas?  Would I switch the part where it multiplies width to multiplying my height?  Switch x- and y-coordinates?  Both?

For nibbles, cant you just do this?

Code: [Select]

:For(A,GDB1,GDB1+length(GDB1)-1)
:2*A->Z
:nib{Z}->M
:nib{Z+1}->N
:.display sprite M
:.display sprite N
:End


optimized with explanation
:For(A,GDB1,GDB1+length(GDB1)-1)
:Z/16->M   //gets only the first 4 bits 'cause it rounds
:Z^16->N    //gets only last 4 bits(modulo)
:.display sprite M
:.display sprite N
:End