public ISketchArcObject(ISketchArc ISketchArcinstance)
{
ISketchArcInstance = ISketchArcinstance;
}
/// <summary>
/// 获取起点
/// </summary>
/// <param name="arc"><see cref="ISketchArc"/> Interface</param>
/// <returns></returns>
public static Vector3 GetStartPoint2Ex(this ISketchArc arc)
{
var point = arc.GetStartPoint2() as ISketchPoint;
return(new Vector3(point.X, point.Y, point.Z));
}