Graal Forums - Useful functions

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Robin

05-08-2008 03:16 AM

Useful functions

Some general useful functions in GS2 :) (Some of them are for compatibility with JS/PHP/etc others are just good)

PHP Code:


		
			
function rand() {
  return new MRandomLCG().randFloat();
}
function tan(x) {
  return sin(x)/cos(x);
}
function atan2(y,x) {
  return x<>0?x>0?atan(y/x):atan(y/x)-radian(180):y>0?radian(90):radian(-90);
}
function atan(number) {
  return arctan(number);
}
function floor(number) {
  return int(number);
}
function ceil(number) {
  return int(number) < number ? number + 1 : number;
}
function radian(degree) {
    return (degree * 0.0174532925);
} 
function degree(radian) {
    return (radian * 57.2957795);
} 
function square(n) {
    return (n * n);
} 
function norm(angle) {
    return (angle - 6.283185 * floor((angle + pi) / 6.283185));
} 
function tile(pixel) {
    return (pixel * 16);
} 
function pixel(tile) {
    return (tile / 16);
}

Enjoy :)

Tigairius

05-08-2008 03:19 AM

Oi! Very nice ;)

cbk1994

05-08-2008 03:24 AM

Not bad! :)

Some of these have been released by other people before (meaning, they made the same thing, not that you stole the script). By the way, you have

PHP Code:


		
			
function random( x )
{
  //blah
}

Yet x is not used at all. Was this left over from before?

Robin

05-08-2008 03:36 AM

Ah yeah, I used to have rand.seed=x but it doesn't really change anything so I took it out for effciency's sake. Edited the post.

Tolnaftate2004

05-08-2008 03:48 AM

Quote:

Originally Posted by Robin (Post 1389554)

... for effciency's sake.

Cascade the 'if's in atan2... for efficiency's sake. ;)

Robin

05-08-2008 04:24 AM

PHP Code:


		
			

function atan2(y,x) {
  if (x < 0) {
    return atan(y/x);
  } elseif (x > 0) {
    return atan(y/x) - radian(180);
  } elseif (x == 0) {
    if (y > 0) {
      return radian(90);
    } elseif (y < 0) {
      return radian(-90);
    } elseif (y==0) {
      return 0;
    }
  }
}

Better? :P

cbk1994

05-08-2008 04:29 AM

PHP Code:


		
			
function floor(number) {
  return int(number);
}

What does this do?

Simply for compatibility with your almighty ECMAScript Standards? ;)

DustyPorViva

05-08-2008 04:31 AM

PHP Code:


		
			
function ceil(number) {
  return int(number) < number ? number + 1 ? number;
}

Shouldn't that be:

PHP Code:


		
			
return int(number) < number ? number + 1 : number;

Robin

05-08-2008 04:44 AM

Quote:

Originally Posted by DustyPorViva (Post 1389567)

PHP Code:


		
			
function ceil(number) {
  return int(number) < number ? number + 1 ? number;
}

Shouldn't that be:

PHP Code:


		
			
return int(number) < number ? number + 1 : number;

You are correct sir! I saw it just now.

Just for that, you get this special version of atan2 as your prize!

PHP Code:


		
			
function atan2(y,x) {
  return x<>0?x>0?atan(y/x):atan(y/x)-radian(180):y>0?radian(90):radian(-90);
}

That's right. They're nested.

Dan	05-08-2008 10:53 AM

There's degtorad and radtodeg built in.

Also, why have this? Besides the fact you lose 2 letters -.-

PHP Code:


		
			
function atan(number) {
  return arctan(number);
}

It's like the same as me doing a "getnumberone()" function for returning 1...

PHP Code:


		
			
function getnumberone() {
  return 1;
}

cbk1994

05-08-2008 10:16 PM

Quote:

Originally Posted by Dan (Post 1389594)

There's degtorad and radtodeg built in.

Also, why have this? Besides the fact you lose 2 letters -.-

PHP Code:


		
			
function atan(number) {

  return arctan(number);

}

It's like the same as me doing a "getnumberone()" function for returning 1...

PHP Code:


		
			
function getnumberone() {

  return 1;

}

I agree, that's rather silly.

Robin

05-08-2008 10:22 PM

ECMAScript compatibility, if you don't like it, don't use my code. Simple.

cbk1994

05-08-2008 10:25 PM

Quote:

Originally Posted by Robin (Post 1389693)

ECMAScript compatibility, if you don't like it, don't use my code. Simple.

No need to get angry. We simply find it strange you would make a new function when you could just type two or three extra characters.

Robin

05-08-2008 10:26 PM

Quote:

Originally Posted by cbkbud (Post 1389695)

No need to get angry. We simply find it strange you would make a new function when you could just type two or three extra characters.

Because I find myself always putting atan in instead of arctan, and wondering why things dont work properly since for some reason my console doesn't like to work and I can't see the error there.

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