C++ (Cpp) REllipse::move Examples

Example #1

File: REllipse.cpp Project: Jackieee/qcad

double REllipse::angleToParam(double a) const {
    double p;
    if (fabs(a - 2*M_PI)<RS::AngleTolerance) {
        p = 2*M_PI;
    }
    else if (fabs(a)<RS::AngleTolerance) {
        p = 0.0;
    }
    else {
        REllipse normEllipse = *this;
        normEllipse.move(-center);
        normEllipse.rotate(-getAngle());
        normEllipse.setStartParam(0.0);
        normEllipse.setEndParam(2*M_PI);

        RLine line(RVector(0,0), RVector::createPolar(getMajorRadius()*2, a));
        QList<RVector> r = RShape::getIntersectionPoints(line, normEllipse, true);
        if (r.length()!=1) {
            return RNANDOUBLE;
        }

        p = acos(r[0].x / getMajorRadius());
    }

    if (RMath::getNormalizedAngle(a) > M_PI) {
        p = 2*M_PI-p;
    }

    return p;
}