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Explanation ? - Printable Version

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Explanation ? - Bearfist - 25.04.2009

Could someone explain me this..I added it from a speedometer..

want to understand it ^^


Код:
distance = floatsqroot(floatpower(floatabs(floatsub(x,SavePlayerPos[i][LastX])),2)+floatpower(floatabs(floatsub(y,SavePlayerPos[i][LastY])),2)+floatpower(floatabs(floatsub(z,SavePlayerPos[i][LastZ])),2));

value = floatround(distance * 5000);
Bearfist

PS:Please explain x'D

Re: Explanation ? - yom - 25.04.2009

http://www.purplemath.com/modules/distform.htm

Re: Explanation ? - Weirdosport - 25.04.2009

It works out the difference in x y and z, squares them and then routes the whole thing. It's Pythagoras's theorem used for 3D co-ordinates. I still don't know why floatabs is there, as squaring a number makes it positive anyway.. maybe floatpower can't cope with negative numbers..

Re: Explanation ? - Bearfist - 25.04.2009

alright thanks to both ..
then i will learn it


....what is FloatPower doing in that function ??

Bearfist

Re: Explanation ? - Weirdosport - 25.04.2009

Floatpower provides the squared bit.

pawn Код:
floatpower(thing,2)
That squares the thing, thing^2. If it was a 3 not a 2 it would be cubed.

Re: Explanation ? - yom - 25.04.2009

pawn Код:
floatpower(thing,2)
equivalent to:

pawn Код:
thing * thing


Re: Explanation ? - Bearfist - 25.04.2009

Thanks a lot ..
now I understanded the hole function =)
*happy* xD

Bearfist

Re: Explanation ? - Weirdosport - 25.04.2009

Yeah it looks pretty messy at first

Re: Explanation ? - Bearfist - 25.04.2009

yeah so I got these (speedo)function

Код:
public UpdateSpeed()
{
	new Float:x,Float:y,Float:z;
	new Float:distance,value,string[256];
	new Float:health;
	for(new i=0; i<SLOTS; i++)
	{
		if(IsPlayerConnected(i) && IsPlayerInAnyVehicle(i))
		{
			TextDrawDestroy(Speedo[i]);
		}
	}

	for(new i=0; i<SLOTS; i++)
	{
		if(IsPlayerConnected(i) && IsPlayerInAnyVehicle(i))
		{
			GetPlayerPos(i, x, y, z);
			GetVehicleHealth(GetPlayerVehicleID(i), health);
			distance = floatsqroot(floatpower(floatabs(floatsub(x,SavePlayerPos[i][LastX])),2)+floatpower(floatabs(floatsub(y,SavePlayerPos[i][LastY])),2)+floatpower(floatabs(floatsub(z,SavePlayerPos[i][LastZ])),2));
			value = floatround(distance * 5000);
			if(UpdateSeconds > 1)
			{
				value = floatround(value / UpdateSeconds);
			}
			format(string,sizeof(string),"~g~Vehicle : ~w~%s ~n~~b~MPH : ~w~%d / ~b~KM/H : ~w~%d~n~~y~Altitude:~w~ %.1f ~n~~r~Vehicle Health:~w~ %.2f",CarName[GetVehicleModel(GetPlayerVehicleID(i))-400],floatround(value/1600),floatround(value/1000),z,health);
			Speedo[i] = TextDrawCreate(320.00, 380.00, string);
			TextDrawSetOutline(Speedo[i], 0);
			TextDrawFont(Speedo[i], 3);
			TextDrawSetProportional(Speedo[i], 2);
			TextDrawAlignment(Speedo[i], 2);
			TextDrawShowForPlayer (i, Speedo[i]);
		}
		SavePlayerPos[i][LastX] = x;
		SavePlayerPos[i][LastY] = y;
		SavePlayerPos[i][LastZ] = z;
	}
}
...but i only want to have the speed ...
I tried to delete the others from it ...
but the km/h isn't the same before deleting the lines =(

Need help

Bearfist