Author Topic: scripts and code snippets (Read 10798 times)

metagross111 · « **Reply #15 on:** December 08, 2008, 05:45:54 pm »

whoa, i wasn't aware this topic existed! its got some interesting stuff.

Builderboy · « **Reply #16 on:** April 22, 2009, 12:45:41 am »

here is a good one for people trying to fit in all their subprograms into 1 program.

While 0 Lbl A Disp "This is inside a subprogram End For(F,-1,0 If F Goto A End

It allows the program execution to jump to any place in the program, and then return back to where it was called. And it causes no Memory leaks, so your program will not slow down because of it!

You can even use the subprogram inside your code instead of just pasting it at the begining with a While 0 in front of it
Repeat 1 Lbl A Disp "This will be executed once Disp "And then again froma subProgram End For(F,-1,0 If F Goto A End

That way you can have at least one part in your code where it does't need to jump to the subprogram, because everything else is jumping to it!

DJ Omnimaga · « **Reply #17 on:** April 22, 2009, 01:36:19 am »

mhmm I'll study this a bit, it will prbly take a while for me to get used to this structure, because I just started coding 2 months ago for the first time in 18 months and most of my programming activity was around 2002, when using lbl/goto anywhere without caring about memory leaks was legion. On top of that I have trouble learning and understanding stuff it seems (probably the reason why I sucked so much at reading tests and why I never managed to succeed at learning assembly, even after 3 hard tries) It might be useful to merge some subroutines together or something. Maybe not in Illusiat, though, because almost everything needs to be stored into archive and only copied temporarly in RAM when needed (sub-routines, map data, etc.) due to the incredible file size and amount of maps (over 200 so far and game is only 20% complete)

nitacku · « **Reply #18 on:** April 23, 2009, 05:40:56 pm »

I used a similar method in a number of my programs.
You want to make sure that your "sub-program" is located at the top of the program because the time it takes for the interpreter to locate the Lbl is directly proportional to its location from the top of the program.

The main advantage of this method is you can send information via Ans, and you don't use any variables.

Start of program:
:Code
:More code
:Goto 0 (you have to skip to the main code since this next part will be the sub-programs)
:Lbl 1
:woot!
:subprogram
:0 (needed so that the loop will end)
:End (normally this would be extraneous, but we induced a temporary memory leak that this will fix)
:Lbl 0 (start of main code)
:code
:stuff
:the last digit of pi is 0
:lets run a sub-program
:1 (can be any non-zero value. This is useful if you want to send information via Ans to subprograms)
:Repeat Ans
:If Ans
:Goto 1
:1
:End
:back to main code
:example finished.

Halifax · « **Reply #19 on:** May 26, 2009, 06:59:26 pm »

BASIC: Length of Integer

Code: [Select]

1+iPart(log(N

This will return the number of the digits that make up the number. Note the use of Integer, meaning that it will not work on floating-point values.
Ex: N = 1234, Output = 4

z80 ASM: Pow2 Multiplication Trick

Code: [Select]

;a = input
ld d,a
ld e,0 ; de = a * 256
srl d \ rr e ; de = a * 128
srl d \ rr e ; de = a * 64
etc.

z80 ASM: Raw Key Input Optimization

Code: [Select]

ld a,$FF
out (1),a
ld a,$FE
out (1),a
nop \ nop
in a,(1)

becomes

Code: [Select]

ld a,$FF
out (1),a
dec a
out (1),a
ld a,(de)
in a,(1)

As you can see, the use of the first optimization can only occur when analyzing the key group $FE. The second optimization takes into account the fact that a will be destroyed by the port read, but the instruction will still delay for the same amount of time that two nop's will.

skuller972 · « **Reply #20 on:** May 26, 2009, 07:04:54 pm »

that basic one is pretty good!

Author Topic: scripts and code snippets (Read 10798 times)

metagross111

Re: scripts and code snippets

Builderboy

Re: scripts and code snippets

DJ Omnimaga

Re: scripts and code snippets

nitacku

Re: scripts and code snippets

Halifax

Re: scripts and code snippets

skuller972

Re: scripts and code snippets