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Math question and assistance

by Sean T. Boyette · in Torque X 2D · 10/27/2008 (11:44 pm) · 3 replies

I am looking to instantly change the rotation of a character via the vector from the stick:
Vector2 tmpVector= new Vector2(move.Sticks[0].X, move.Sticks[0].Y);

I need to convert this vector to a value on the pi of a cicle that it would represent. (I am sure I am saying this incorrectly)
for instance
(0,1) = straight up or .785
(1,0) = striaght to the right or 0 (or 3.14)
(0,-1) = straight down or 2.355
(-1,0) = Left - or 1.57

in order to multiply it by two and rotate the model via this:
SceneGroup.Rotation = Quaternion.CreateFromYawPitchRoll(0.0f, 0.0f, calculated value here);

any help would be appriciated.

Sean
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Torque Owner Sean T. Boyette
#1
10/28/2008 (10:07 am)
Figured it out!

To rotate a character in the direction of the analog stick:

float radians;
            radians = (float)Math.Atan2(move.Sticks[0].Y, move.Sticks[0].X);
            SceneGroup.Rotation = Quaternion.CreateFromYawPitchRoll(0.0f, 0.0f, radians);

Torque Owner Zilla
#2
10/28/2008 (12:46 pm)
Cool. There is also a TDN example from Henry Garle with an aiming function for the platformer framework that uses this rotation:

tdn.garagegames.com/wiki/TorqueX/PlatformerFrameworkShooter

Torque Owner Sean T. Boyette
#3
10/28/2008 (2:09 pm)
Zilla,

Nice - this is really aimed at 3d objects, but Henry's aiming function is also good for an 2d implementation.
Sean