[help] calcangle?

void CalcAngle( float *src, float *dst, float *angles )
        {
                double delta[3] = { (src[0]-dst[0]), (src[1]-dst[1]), (src[2]-dst[2]) };
                double hyp = sqrt(delta[0]*delta[0] + delta[1]*delta[1]);
 
                angles[0] = (float) (asinf(delta[2]/hyp) * M_RADPI);
                angles[1] = (float) (atanf(delta[1]/delta[0]) * M_RADPI);
                angles[2] = 0.0f;
 
                if(delta[0] >= 0.0) { angles[1] += 180.0f; }
        }