Trigonometric functions- get angle from player to point.

Trigonometric functions- get angle from player to point. - Printable Version

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+---- Thread: Trigonometric functions- get angle from player to point. (/showthread.php?tid=28664)

Trigonometric functions- get angle from player to point. - robhol - 03.03.2008

I just wondered if anybody might have this function ready- I'm no big wizz at trigonometry, and we haven't learned about it in school.
My problem is this; There are two players on a server (A and B). A enters a command that will tell him B's location, and how many degrees to turn to face him. How to make this command? I know it should be possible, it's just... kinda out of my league at the moment.

Re: Trigonometric functions- get angle from player to point. - [LDT]LuxurY - 03.03.2008

oh, something with sin and cos. but I haven't time to think about it

Re: Trigonometric functions- get angle from player to point. - robhol - 03.03.2008

Quote:

Originally Posted by [LDT

LuxurY ]
oh, something with sin and cos. but I haven't time to think about it

Then why the hell do you post...

I know it's Sin(-e) and Cos(-ine), I already said so in my topic title. There's probably a Tan(-gent) hiding somewhere in there too. I just have no fricking clue how to use them.

Re: Trigonometric functions- get angle from player to point. - Antironix - 03.03.2008

You have a triangle like this

a b
----
| /
|/
c

To calculate a-c you need to know b-c and use co-sinus.

Well, that's a little, i am tired right now, i will give you what cos, sin and tan does.

Sin = Looking from the corner b, oposide(a-c) : diagonal side(b-c)
Cos = Opposide : diagonal side
Tan = Opposide : the line connected with the start corner. Like if you have the "start" corner c, the "line" is a-c

diagonal side is the side what doesn't have a 90 degree corner.

I know, it's a little bit messy, but i hope you understand some more.

Re: Trigonometric functions- get angle from player to point. - robhol - 03.03.2008

Vaguely- but it's not like I can read that and suddenly make the whole function, if you get my meaning... Thanks for the help though.
Has anybody got that formula? :P

Re: Trigonometric functions- get angle from player to point. - robhol - 16.03.2008

I still need this and an answer would be very nice.. anyone?

Re: Trigonometric functions- get angle from player to point. - Puffmac - 16.03.2008

Quote:

Originally Posted by robhol

I still need this and an answer would be very nice.. anyone?

OK, wth is trignonometry? Lol, me forget. Mabey something like this, or mabey it has fuck all to do with it

pawn Код:

if(!strcmp(cmdtext, "/ppos", true)) {
    new id; // this is the variable for the second person
    new Float:idang, Float:playeridang;
    GetPlayerFacingAngle(playerid,playeridang);
    GetPlayerFacingAngle(id,idang);
    new diff;
    if(playeridang > idang) diff = playeridang-idang
    else diff = idang-playerid;
    return diff;
    format(str,sizeof(str),"Turn %d dgrees",diff);
    SendClientMessage(playerid,0xFFFF00AA,str);
    return 1;
}

Re: Trigonometric functions- get angle from player to point. - robhol - 17.03.2008

Sorry, Puff, but that has pretty much fuck all to do with it

I need to get a command that makes the player face a point, given X and Y.

Re: Trigonometric functions- get angle from player to point. - yom - 17.03.2008

I tried doing something like that long time ago, failed. But now there is atan (and atan2), it will probably be easier. I will maybe retry, as i may need it too.

Re: Trigonometric functions- get angle from player to point. - MidoBan - 17.03.2008

I dont know if i'm correct, but i'm not sure that u need those cos and sin functions for this.
I built a pet system and when the pet attacks, it chases the player and always facing him.
I just took the target player's angle subtracted it form 180 (180-the target's angle). Then i applied the outcome angle on the pet.
yom, u replied to my question on my pets topic with the 180 degrees thing..
So y won't it work on this script? just subtract the outcome of the 180 degrees thing from the player's facing angle, and thats how much he need to turn... no?

Re: Trigonometric functions- get angle from player to point. - ғαιιοцт - 16.02.2009

Code:

stock SetPlayerLookAt(playerid, Float:x, Float:y)
{
	new Float:Px, Float:Py, Float: Pa;
	GetPlayerPos(playerid, Px, Py, Pa);
	Pa = floatabs(atan((y-Py)/(x-Px)));
	if (x <= Px && y >= Py) Pa = floatsub(180, Pa);
	else if (x < Px && y < Py) Pa = floatadd(Pa, 180);
	else if (x >= Px && y <= Py) Pa = floatsub(360.0, Pa);
	Pa = floatsub(Pa, 90.0);
	if (Pa >= 360.0) Pa = floatsub(Pa, 360.0);
	SetPlayerFacingAngle(playerid, Pa);
}

it works

http://forum.sa-mp.com/index.php?topic=89955.msg579674#msg579674