et colors as html hex

Spoofeh · Post by **Spoofeh** » Wed Dec 28, 2005 10:00 am

gotenks wrote:ANY computer casting (to an int type number, eg non floating point) rounds down...

It doesn't round, it discards (or truncates) the decimal part.

1.9 => 1
-1.9 => -1

gotenks · Post by **gotenks** » Wed Dec 28, 2005 10:43 am

i was going to say that, but i thought it'd be easier to understand

ouroboro · Post by **ouroboro** » Wed Dec 28, 2005 11:34 am

gotenks wrote:ANY computer casting (to an int type number, eg non floating point) rounds down...

f = float, no?

gotenks · Post by **gotenks** » Wed Dec 28, 2005 12:01 pm

float = float, unless you're using something i'm unaware of...byte = non-floatingpoint value

ReyalP · Post by **ReyalP** » Wed Dec 28, 2005 4:35 pm

ouroboro wrote:< .5 rounds down. >= .5 rounds up. every elementary school kid knows that.

Yes, but kids who know C know that converting a float to an integer type doesn't necessarily round.

If I remember right, what actually happens is up to the implementation, but all the implementations that interest us in this truncate.

Dersaidin · Post by **Dersaidin** » Wed Dec 28, 2005 9:00 pm

Made this a while ago

http://www.mercness.net/dersaidin/namecolor.php

With every working character.

ouroboro · Post by **ouroboro** » Thu Dec 29, 2005 6:52 am

gotenks wrote:float = float, unless you're using something i'm unaware of...byte = non-floatingpoint value

q_math.c wrote:{ 0.7f, 0.1f, 0.1f, 1.0 }, // J

i would translate those values to an RGB of 178.5, 25.5, 25.5 - and i would round them to 179, 26, 26 (^J = #B31A1A).

i can only assume the f's in those RGBA values = "float". you can correct me if they mean something else (i'm no coder), but it really doesn't matter, because at least one source agrees with me - adobe photoshop. it rounds RGB values according to the "elementary school method".

i'll stick with the HEX values i came up with. they make logical sense (to me and adobe), and even if they're wrong somehow, they're damn close, as rounding down would give #B21919 in this example - not exactly a drastic difference.

gotenks · Post by **gotenks** » Thu Dec 29, 2005 9:09 am

those would be floats, and if, before they are converted to integers, they use math.round (or what ever the C code is, i think it's right, but not sure) then you are correct, but if the values are directly stored as integers, then you are incorrect

ouroboro · Post by **ouroboro** » Thu Dec 29, 2005 9:21 am

gotenks wrote:...if, before they are converted to integers, they use math.round...

how would i find out?

edit - i searched the entire source code for "math.round" with no hits

gotenks · Post by **gotenks** » Thu Dec 29, 2005 9:46 am

so they're truncated... not rounded

ouroboro · Post by **ouroboro** » Thu Dec 29, 2005 10:43 am

then i fail. delete this thread

one thing though: why would photoshop round up for RGB values >= .5 if it goes against the standard for programming?

WeblionX · Post by **WeblionX** » Thu Dec 29, 2005 10:50 am

Because they felt like using rounding instead of dropping it. Why? They probably thought it would be more consumer friendly.

gotenks · Post by **gotenks** » Thu Dec 29, 2005 11:15 am

they're also not a programming language... 2 ways of handling it, both are correct, 1 is correct for programming, 1 is correct for web aps

Spoofeh · Post by **Spoofeh** » Fri Dec 30, 2005 5:24 am

gotenks wrote:so they're truncated... not rounded

The absence of "math.round" in the source doesn't prove anything (it's not a standard C function).

That's beside the point though, since it looks to me like colours are float throughout cgame. Conversion is either done in the engine or the gfx driver/hardware (my guess).

ouroboro · Post by **ouroboro** » Sat Dec 31, 2005 11:14 am

Spoofeh wrote:
gotenks wrote:so they're truncated... not rounded
The absence of "math.round" in the source doesn't prove anything (it's not a standard C function).

That's beside the point though, since it looks to me like colours are float throughout cgame. Conversion is either done in the engine or the gfx driver/hardware (my guess).

mmmkay, so does this mean i win?