/// <summary>
/// 两点绘制圆
/// </summary>
/// <param name="db">图形数据库</param>
/// <param name="point1">第一个电</param>
/// <param name="point2">第二个点</param>
/// <returns></returns>
public static ObjectId AddCircleModeSpace(this Database db, Point3d point1, Point3d point2)
{
// 获取两点的中心点
Point3d center = point1.GetCenterPointBetweenTwoPoint(point2);
// 获取半径
double radius = point1.GetDistanceBetweenTwoPoint(center);
return(db.AddCircleModeSpace(center, radius));
}
/// <summary>
/// 三点绘制椭圆
/// </summary>
/// <param name="db">图形数据库</param>
/// <param name="majorPoint1">长轴端点1</param>
/// <param name="majorPoint2">长轴端点2</param>
/// <param name="shortRadius">短轴的长度</param>
/// <returns>ObjectId</returns>
public static ObjectId AddEllipseToModeSpace(this Database db, Point3d majorPoint1, Point3d majorPoint2, double shortRadius)
{
// 椭圆圆心
Point3d center = majorPoint1.GetCenterPointBetweenTwoPoint(majorPoint2);
// 短轴与长轴的比例
double ratio = 2 * shortRadius / majorPoint1.GetDistanceBetweenTwoPoint(majorPoint2);
// 长轴的向量
Vector3d majorAxis = majorPoint2.GetVectorTo(center);
Ellipse elli = new Ellipse(center, Vector3d.ZAxis, majorAxis, ratio, 0, 2 * Math.PI);
return(db.AddEntityToModeSpace(elli));
}