Useful functions

[Robin]

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]

Oi! Very nice

[cbk1994]

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]

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]

Originally Posted by Robin

... for effciency's sake.

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

[Robin]

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]

PHP Code:

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


What does this do?

Simply for compatibility with your almighty ECMAScript Standards?

[DustyPorViva]

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]

Originally Posted by DustyPorViva

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]

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]

Originally Posted by Dan

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]

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

[cbk1994]

Originally Posted by Robin

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]

Originally Posted by cbkbud

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.