help with my function

Tim Cowley · 2003-03-26T20:44:02

#define ToDegree(x) ((x) * (180.0f / PI)) float Angle(Vector v1, Vector v2) { return ToDegree(atanf((v2.y-v1.y)/(v2.x-v1.x))); } why does this not gi ve me the angle?

Math and Physics Programming

Started by YodaTheCoda March 25, 2003 12:49 AM

17 comments, last by YodaTheCoda 21 years ago

Anonymous

March 25, 2003 07:47 AM

quote:Original post by YodaTheCoda
why does this not gi ve me the angle?

What angle is "the" angle? The angle you calculate is the angle between the positive x-axis and the vector (v2-v1). If this is not the angle you want then that is the reason you don''t get it.

YodaTheCoda

100

Author

March 25, 2003 03:19 PM

yuor not making any sense poppet
of cuorse if i dont have the angle then i dont hasve the angle
what is yuor pointy?

Dobbs

164

March 25, 2003 03:25 PM

Please don''t feed the trolls.

YodaTheCoda

100

Author

March 25, 2003 03:30 PM

im sure hes just confused
dont be to hard on him
at least let him explain himself first

JohnBolton

1,373

March 26, 2003 12:07 AM

The way to find the angle (as already suggested by MDI and Prosper/LOADED) is:

  angle = acos( Dot( v1, v2 ) / ( Length(v1)*Length(v2) ) );

Atan is a 2D fuction. You can use it in 3D, but it is very complicated.

John BoltonLocomotive Games (THQ)Current Project: Destroy All Humans (Wii). IN STORES NOW!

Anonymous

March 26, 2003 01:29 AM

Yuo shood not tok about things yuo cannot spel dumass

MDI

266

March 26, 2003 05:07 AM

YodaTheCoda is a troll.
He''s winding you all up, look at his profile for his past posts (he keeps telling beginners all C++ is compiled to Cobol and then to Assembly, for one).

Why do old statues have small penises?

LilBudyWizer

491

March 26, 2003 06:29 AM

That''s a handy feature. Certainly a drastic differance in his command of the language from some of those other posts to this isn''t there. Something does seem a bit fishy.

Keys to success: Ability, ambition and opportunity.

grhodes_at_work

1,385

March 26, 2003 08:44 PM

I''m closing this thread for the following reasons:

1) Without a better explanation of the desired angle I believe the problem has been properly solved by Prosper/LOADED, MDI, and Jambolo.

2) This thread is getting a bit out of hand. Any discussion of coding practices should happen in the general programming forum or the lounge.

Graham Rhodes
Senior Scientist
Applied Research Associates, Inc.

Graham Rhodes Moderator, Math & Physics forum @ gamedev.net

help with my function

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