两点角度 ARX

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  AcGePoint3d pStart = pUtils->GetStartPoint();
  AcGePoint3d pEnd = pUtils->GetEndPoint(pStart);
  AcGeVector3d v1(pStart.x,pStart.y,pStart.z);
  AcGeVector3d v2(pEnd.x,pEnd.y,pEnd.z);
  AcGeVector3d v3(pStart.x + Length/2,pEnd.y,pStart.z);
  double Angle = v1.angleTo(v2,v3) ;
  ads_printf("\nAndrew - Angle: %.2lf\n",Angle);