bool RS_Ellipse::switchMajorMinor(void) //switch naming of major/minor, return true if success { if (fabs(data.ratio) < RS_TOLERANCE) return false; RS_Vector vp_start=getStartpoint(); RS_Vector vp_end=getStartpoint(); RS_Vector vp=getMajorP(); setMajorP(RS_Vector(- data.ratio*vp.y, data.ratio*vp.x)); //direction pi/2 relative to old MajorP; setRatio(1./data.ratio); if( std::isnormal(getAngle1()) || std::isnormal(getAngle2() ) ) { //only reset start/end points for ellipse arcs, i.e., angle1 angle2 are not both zero setAngle1(getEllipseAngle(vp_start)); setAngle2(getEllipseAngle(vp_end)); } return true; }
/** * mirror by the axis defined by axisPoint1 and axisPoint2 */ void RS_Ellipse::mirror(RS_Vector axisPoint1, RS_Vector axisPoint2) { RS_Vector center=getCenter(); RS_Vector mp = center + getMajorP(); RS_Vector startpoint = getStartpoint(); RS_Vector endpoint = getEndpoint(); center.mirror(axisPoint1, axisPoint2); mp.mirror(axisPoint1, axisPoint2); startpoint.mirror(axisPoint1, axisPoint2); endpoint.mirror(axisPoint1, axisPoint2); setCenter(center); setReversed(!isReversed()); setMajorP(mp - center); if( std::isnormal(getAngle1()) || std::isnormal(getAngle2() ) ) { //only reset start/end points for ellipse arcs, i.e., angle1 angle2 are not both zero setAngle1( getEllipseAngle(startpoint)); setAngle2( getEllipseAngle(endpoint)); } /* old version data.majorP = mp - data.center; double a = axisPoint1.angleTo(axisPoint2); RS_Vector vec; vec.setPolar(1.0, data.angle1); vec.mirror(RS_Vector(0.0,0.0), axisPoint2-axisPoint1); data.angle1 = vec.angle() - 2*a; vec.setPolar(1.0, data.angle2); vec.mirror(RS_Vector(0.0,0.0), axisPoint2-axisPoint1); data.angle2 = vec.angle() - 2*a; data.reversed = (!data.reversed); */ //calculateEndpoints(); correctAngles();//avoid extra 2.*M_PI in angles calculateBorders(); }
RS_VectorSolutions LC_Hyperbola::getFoci() const { RS_Vector vp(getMajorP()*sqrt(1.-getRatio()*getRatio())); return RS_VectorSolutions({getCenter()+vp, getCenter()-vp}); }