/*---------------------------------------------------------------*/
static double calcTheta(double ki, double kf, double two_theta){
/**
* |ki| - |kf|cos(two_theta)
* tan(theta) = --------------------------
* |kf|sin(two_theta)
*/
return rtan(ABS(ki) - ABS(kf)*Cosd(two_theta),
ABS(kf)*Sind(two_theta))/DEGREE_RAD;
}
/**
* \return Tangent angle of spline at end point.
*/
double RSpline::getDirection2() const {
if (!isValid()) {
return 0.0;
}
updateInternal();
#ifndef R_NO_OPENNURBS
ON_3dVector ontan = curve.TangentAt(getTMax());
RVector rtan(ontan.x, ontan.y);
return RMath::getNormalizedAngle(rtan.getAngle() + M_PI);
#else
return 0.0;
#endif
}
