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Line Matrix Rotation?
September 28, 2002 09:13 PM
spin = 10;// ten degreees of rotation
dir.y = float(cos(spin) - sin(spin));
dir.x = float(cos(spin) + sin(spin));
this isnt really working for me for some reason
can anyone help?
ive been out of math class for a while
122
September 28, 2002 09:28 PM
If I''m not mistaken the spin variable needs to be incremented for each use of the rotation for it to have an effect. Otherwise, the code seems okay to me..
Tina
Tina
125
September 28, 2002 11:08 PM
I''m not quite sure what you mean, but it might be this you''re looking for, dunno:
inline void VecRotate2f(float* a, int Angle){ float Xnew, Ynew; Xnew = a[0] * Cos[Angle] - a[1] * Sin[Angle]; Ynew = a[0] * Sin[Angle] + a[1] * Cos[Angle]; a[0] = Xnew; a[1] = Ynew;} 
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