/// <summary>
/// 两点绘制圆(两点的中心为圆心)
/// </summary>
/// <param name="db">图形数据库</param>
/// <param name="point1">起点</param>
/// <param name="point2">终点</param>
/// <returns>对象Id</returns>
public static ObjectId AddCircleToModelSpace(this Database db, Point3d point1, Point3d point2)
{
//获取中心点
Point3d centerPoint = point1.GetCenterPointBetweenTwoPoint(point2);
//获取半径
double radius = centerPoint.GetDistanceBetweenToPoint(point1);
return(AddCircleToModelSpace(db, centerPoint, radius));
}
/// <summary>
/// 绘制椭圆
/// </summary>
/// <param name="db">图形数据库</param>
/// <param name="majorRadius1">长轴端点1</param>
/// <param name="majorRadius2">长轴端点2</param>
/// <param name="shortRadius">短轴的长度</param>
/// <returns>ObjectId</returns>
public static ObjectId AddEllipseToModelSpace(this Database db, Point3d majorRadius1, Point3d majorRadius2, double shortRadius)
{
Point3d center = majorRadius1.GetCenterPointBetweenTwoPoint(majorRadius2);
//获取短轴与长轴的比例 不能大于1 否则会生成原点的一个圆形
double ratio = (2 * shortRadius) / majorRadius1.GetDistanceBetweenToPoint(majorRadius2);
Vector3d MajorAxis = majorRadius1.GetVectorTo(center);
Ellipse ellipse = new Ellipse(center, Vector3d.ZAxis, MajorAxis, ratio, 0, 2 * Math.PI);
return(AddEntityToModelSpace(db, ellipse));
}
/// <summary>
/// 根据圆心、起点、角度绘制圆弧
/// </summary>
/// <param name="db">图形数据库</param>
/// <param name="center">圆心</param>
/// <param name="startPoint3d">起点</param>
/// <param name="degree">夹角值(角度值)</param>
/// <returns></returns>
public static ObjectId AddArcToModelSpace(this Database db, Point3d center, Point3d startPoint3d, double degree)
{
//获取半径
double radius = center.GetDistanceBetweenToPoint(startPoint3d);
//获取起始角度
double startAngle = center.GetAngle(startPoint3d);
//声明圆弧对象 //角度转换为弧度
Arc arc = new Arc(center, radius, startAngle, startAngle + degree.DegreeToAngle());
//添加到图形数据库中
return(AddEntityToModelSpace(db, arc));
}