GetObjectSnapPoints函数的主要参数介绍 by游天居士

GetObjectSnapPoints函数的主要参数介绍

定义一：

 

public virtual void GetObjectSnapPoints(ObjectSnapModes snapMode, int gsSelectionMark, Point3d pickPoint, Point3d lastPoint, Matrix3d viewTransform, Point3dCollection snapPoints, IntegerCollection geometryIds);

 

定义二：

 

       public virtual void GetObjectSnapPoints(ObjectSnapModes snapMode, int gsSelectionMark, Point3d pickPoint, Point3d lastPoint, Matrix3d viewTransform, Point3dCollection snapPoints, IntegerCollection geometryIds, Matrix3d insertionMat)

 

 

（1）

snapMode 是enum类型 ，这是对象捕捉模式设置ObjectSnapModes的枚举名称取值如下表：

Member Name	Description	Value	Description的翻译
ModeNear	Nearest.	10	最近点
ModeTangent	Tangent.	9	切点
ModePerpendicular	Perpendicular.	8	垂足
ModeIns	Insertion.	7	插入点
ModeQuad	Quadrant.	5	象限点
ModeNode	Node.	4	节点；交叉点
ModeCenter	Center.	3	圆心
ModeMid	Midpoint.	2	中点
ModeEnd	Endpoint.	1	端点

 

（2）gsSelectionMark是int类型， Graphics System Selection Mark,即选择集中图元的图形系统标记。每个实体可能包含多个子实体，一般设置为0,代表整个实体。可精细设置到具体实体内部的子实体。

（3）pickPoint是Point3d 类型 ，设置拾取点，如果不是有具本要求如求最近点的话可以设置为(0,0,0）

（4）snapPoints是Point3dCollection类型 ，获取捕捉点集合对象

（5）其它参数设置详见Autodesk.AutoCAD.Geometry空间介绍

[CommandMethod("DispGetEntsnap", CommandFlags.Session)]

public void DispGetEntsnap()//遍历显示捕捉点（端点）

        {

            using (DocumentLock docLock = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.LockDocument())

// 游天居士到此一游

            {

                Database db = HostApplicationServices.WorkingDatabase;

                using (Transaction trans = db.TransactionManager.StartTransaction())

                {

                    Entity ent = (Entity)trans.GetObject(GetSelectFirstEntityid(), OpenMode.ForWrite);

                    Point3d pickPt = new Point3d(0, 0, 0);

                    Point3dCollection snapPts = new Point3dCollection();

                    IntegerCollection geomIds = new IntegerCollection();

                    geomIds.Add(0);

                    ent.GetObjectSnapPoints(ObjectSnapModes.ModeEnd, 0, pickPt, pickPt, Matrix3d.Identity, snapPts, geomIds);

                    for (int i = 0; i < snapPts.Count; i++)

                    {

                        ed.WriteMessage("\n点是:" + (i + 1).ToString() + ":"+snapPts.ToString());

                    }

                    trans.Commit();

                }

            }

        }