[dracar]

I need to find the point behind a car, no matter what direction its facing. Haven't taken a calc class yet, I think that's what I need here. I believe this is the code I need, but i don't know anything at all about sine/cosine

Код:

X += (5.0*floatsin(-(A-45.0), degrees));
Y += (5.0*floatcos(-(A-45.0), degrees));

Id like an explanation too so I can do it myself in the future.

Thanks
Hiaburi

[adsy]

does this help?

Код:

GetXYInFrontOfPlayer(playerid, &Float:x, &Float:y, Float:distance)
{
	new Float:a;
	GetPlayerPos(playerid, x, y, a);
	GetPlayerFacingAngle(playerid, a);
	if (GetPlayerVehicleID(playerid))
	{
	  GetVehicleZAngle(GetPlayerVehicleID(playerid), a);
	}
	x += (distance * floatsin(-a, degrees));
	y += (distance * floatcos(-a, degrees));
}

use a negative for distance

usage

Код:

GetXYInFrontOfPlayer(playerid, xpos,ypos, -yourdistancebehind);

[dracar]

Thats nice, works for now, still dont understand it though lol

[adsy]

neither do i, credits to the person who made it. found as a stock on the wiki

https://sampwiki.blast.hk/wiki/Stocks

[dracar]

Well, thanks either way, couldn't figure out what to search for on the wiki to find it lol

[Nero_3D]

Quote:

Originally Posted by dracar Thats nice, works for now, still dont understand it though lol

You want an explanation, mh, thats a good picture

The first number is cosine and the second after the comman sine (thats a unit circle), so


cos(0°) = 1, cos(90°) = 0, cos(180°) = -1, cos(270°) = 0 (calculates the X)
sin(0°) = 0, sin(90°) = 1, sin(180°) = 0, sin(270°) = -1 (calculates Y)

and the other numbers you only need to know for sure if you are gonna study

and because the angle in GTA San Andreas start at the "normal" 90° we just could do (Angle + 90.0) or the more famous methode switching the trigonometric functions and put a minus before the Angle

Or just read the en.wiki page about Unit circle (its not rly long)

Hope that helped a bit