RVector RArc::getMiddlePoint() const {
double a;
a = startAngle + getSweep()/2.0;
RVector v = RVector::createPolar(radius, a);
v+=center;
return v;
}
double RArc::getBulge() const {
//qDebug() << "sweep: " << getSweep();
double bulge = tan(fabs(getSweep()) / 4.0);
if (isReversed()) {
bulge *= -1;
}
return bulge;
}
/**
* \return Angle length in rad.
*
* \param allowForZeroLength: Allow for zero length result if start
* and end angle are the same. Otherwise 2*PI will be returned for
* such an arc, assuming it is a full circle.
*
* \todo almost the same as getSweep
*/
double RArc::getAngleLength(bool allowForZeroLength) const {
double ret = fabs(getSweep());
// full circle or zero length arc:
if (!allowForZeroLength) {
if (ret < RS::PointTolerance) {
ret = 2 * M_PI;
}
}
else {
if (ret > 2 * M_PI - RS::PointTolerance) {
ret = 0.0;
}
}
return ret;
}
RVector REllipse::getMiddlePoint() const {
double a;
a = getStartParam() + getSweep()/2.0;
return getPointAt(a);
}
