Calculating angles...
Author
I''m working on implementing gravity in my game. I have a planet as the center, and I want to figure out the angle from the planet to the ship. But the problem is, I can''t figure out how to calculate the angle.
0,0 the planet''s location
X,Y the ship''s location
X,Y can be either positive or negative.
How will I calculate this?
Is this correct?
float Angle = cos(Y); or Angle = sin(X);
Man I''m very rustic with my math
* planet (px, py) |\--------------------- angle a | \ H L| \ |___* ship (sx, sy) C H*H = sqrt(L*L + C*C)
C=Sin(a)/H <=> Sin(a) = C*H <=> a=Sin-1(C*H)
i think that's it but i'm not sure, my math aint that sharp
[edit]
forgot to say that
C=px-sx
L=py-sy
but again am not sure
[edited by - luxitan on February 9, 2003 8:11:03 PM]
[edited by - luxitan on February 9, 2003 8:11:20 PM]
Author
Thanks. Is there a math function for arc tan? Like < cmath >'s sin() and cos()?
If not, I can just do cos()/sin(); instead
Edit: Blasted < >!
[edited by - Zeraan on February 9, 2003 10:28:40 PM]
If not, I can just do cos()/sin(); instead
Edit: Blasted < >!
[edited by - Zeraan on February 9, 2003 10:28:40 PM]
There isn''t actually an angle to find in your problem unless you introduce a third point into the equation.
...there is an angle to find, but it will be with reference to a particular axis eg: 25 degrees about Y, from the positive Z axis(looking down the Y axis). So essentially treating the problem in 2D. The same can be done for all other axis if need be.
This topic is closed to new replies.
Advertisement
Popular Topics
Advertisement
