使用JOIN命令连接多段线时候保留XDATA数据

CSharpBoy · 发表于 2016-10-19 00:18:54

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问题：
我的程序在（AcDb2dPolyline）的每个顶点都附加了XDATA数据，当我使用JOIN命令连接另外一个多段线的时候，顶点的XDATA数据丢失，我如何能防止这样？

解决方案：
在使用JOIN命令的时候，AUTOCAD不会保留2D多段线顶点的XDATA数据，解决方法是写一个命令实现JOIN命令功能的同时保留住XDATA数据，下面C#代码演示如何实现。注意，通过UNDEFINE命令注销掉JOIN命令然后把自己的命令定义成JOIN，用户就像还在使用JOIN命令一样。

[it618postdisplay>0] // Define Command "njoin"[/it618postdisplay]
[sell=5]

[CommandMethod("join")]
static public void njoin()
{
//Code to replace the AutoCAD's join command.
//Please not that minimal error checking is done for code brevity
//Select the source entity
PromptEntityResult pEntrs;
pEntrs = Application.DocumentManager.MdiActiveDocument.Editor.GetEntity("\nSelect source polyline: ");
if(PromptStatus.OK != pEntrs.Status) return;
ObjectId srcId = pEntrs.ObjectId;
pEntrs = Application.DocumentManager.MdiActiveDocument.Editor.GetEntity("\nSelect polyline to join: ");
if(PromptStatus.OK != pEntrs.Status) return;
ObjectId joinId = pEntrs.ObjectId;
Transaction trans = null;
try
{
trans = HostApplicationServices.WorkingDatabase.TransactionManager.StartTransaction();
Polyline2d srcPLine = (Polyline2d)trans.GetObject(srcId, OpenMode.ForRead); //will throw error if the entity is not a polyline
Polyline2d addPLine = (Polyline2d)trans.GetObject(joinId, OpenMode.ForRead); //will throw error if the entity is not a polyline
System.Collections.IEnumerator destItr = addPLine.GetEnumerator();
System.Collections.IEnumerator srctItr = srcPLine.GetEnumerator();
//Get the last point of the source polyline
ObjectId srcLastVertId = ObjectId.Null;
while (false != srctItr.MoveNext())
{
srcLastVertId = (ObjectId)srctItr.Current;
}
//Check if the first point or the last point is same as the src polylines end point
//Get all the vertices of the second polyline
ObjectIdCollection ids = new ObjectIdCollection();
while (false != destItr.MoveNext())
{
ids.Add((ObjectId)destItr.Current);
}
//Check which vertex is same as that of the last vertex of the src polyline
Vertex2d srcLastVert = (Vertex2d) trans.GetObject((ObjectId)srcLastVertId, OpenMode.ForRead);
Vertex2d addVert = (Vertex2d) trans.GetObject((ObjectId)ids[0], OpenMode.ForRead);
int ctr, step;
if(srcLastVert.Position == addVert.Position)
{
ctr = 0; step = 1;
}
else
{
addVert = (Vertex2d) trans.GetObject((ObjectId)ids[ids.Count - 1], OpenMode.ForRead);
if(srcLastVert.Position == addVert.Position)
{
ctr = ids.Count - 1; step = -1;
}
else
{
Application.DocumentManager.MdiActiveDocument.Editor.WriteMessage("\nEnd points do not match.");
//neither the first or the last point matches, hence quit
throw new System.Exception();
}
}
srcPLine.UpgradeOpen();
for(int ctr1 = 0; ctr1 < ids.Count;ctr1++)
{
addVert = (Vertex2d) trans.GetObject((ObjectId)ids[ctr], OpenMode.ForRead);
Vertex2d vertClone = (Vertex2d)addVert.Clone();
srcPLine.AppendVertex(vertClone);
trans.AddNewlyCreatedDBObject(vertClone, true);
ctr += step;
}
trans.Commit();
trans.Dispose();
//Delete the old polyline
trans = HostApplicationServices.WorkingDatabase.TransactionManager.StartTransaction();
addPLine = (Polyline2d)trans.GetObject(joinId, OpenMode.ForWrite);
addPLine.Erase();
//Commit the transaction
trans.Commit();
Application.DocumentManager.MdiActiveDocument.Editor.WriteMessage("\nAdded " + ctr.ToString() +" vertices.");
}
catch (System.Exception es)
{
//Application.DocumentManager.MdiActiveDocument.Editor.WriteMessage(es.Message);
}
finally
{
trans.Dispose();
}
}

[CommandMethod("join")] 
static public void njoin() 
{ 
    //Code to replace the AutoCAD's join command. 
    //Please not that minimal error checking is done for code brevity 
 
    //Select the source entity 
    PromptEntityResult pEntrs; 
    pEntrs = Application.DocumentManager.MdiActiveDocument.Editor.GetEntity("\nSelect source polyline: "); 
 
 
    if(PromptStatus.OK != pEntrs.Status) return; 
 
 
    ObjectId srcId = pEntrs.ObjectId; 
 
 
    pEntrs = Application.DocumentManager.MdiActiveDocument.Editor.GetEntity("\nSelect polyline to join: "); 
 
 
    if(PromptStatus.OK != pEntrs.Status) return; 
 
 
    ObjectId joinId = pEntrs.ObjectId; 
 
 
    Transaction trans = null; 
    try 
    { 
        trans = HostApplicationServices.WorkingDatabase.TransactionManager.StartTransaction(); 
        Polyline2d srcPLine = (Polyline2d)trans.GetObject(srcId, OpenMode.ForRead); //will throw error if the entity is not a polyline 
        Polyline2d addPLine = (Polyline2d)trans.GetObject(joinId, OpenMode.ForRead); //will throw error if the entity is not a polyline 
        System.Collections.IEnumerator destItr = addPLine.GetEnumerator(); 
        System.Collections.IEnumerator srctItr = srcPLine.GetEnumerator(); 
       
        //Get the last point of the source polyline 
        ObjectId srcLastVertId = ObjectId.Null; 
        while (false != srctItr.MoveNext()) 
        { 
            srcLastVertId = (ObjectId)srctItr.Current; 
        }                                                
 
 
        //Check if the first point or the last point is same as the src polylines end point 
 
 
        //Get all the vertices of the second polyline 
        ObjectIdCollection ids = new ObjectIdCollection(); 
        while (false != destItr.MoveNext()) 
        { 
            ids.Add((ObjectId)destItr.Current); 
        } 
 
 
        //Check which vertex is same as that of the last vertex of the src polyline 
        Vertex2d srcLastVert = (Vertex2d) trans.GetObject((ObjectId)srcLastVertId, OpenMode.ForRead); 
        Vertex2d addVert = (Vertex2d) trans.GetObject((ObjectId)ids[0], OpenMode.ForRead); 
 
 
        int ctr, step; 
        if(srcLastVert.Position == addVert.Position) 
        { 
            ctr = 0; step = 1; 
        } 
        else 
        {                      
            addVert = (Vertex2d) trans.GetObject((ObjectId)ids[ids.Count - 1], OpenMode.ForRead); 
            if(srcLastVert.Position == addVert.Position) 
            { 
                ctr = ids.Count - 1; step = -1; 
            } 
            else 
            { 
                Application.DocumentManager.MdiActiveDocument.Editor.WriteMessage("\nEnd points do not match."); 
                //neither the first or the last point matches, hence quit 
                throw new System.Exception(); 
            } 
        } 
        srcPLine.UpgradeOpen(); 
        for(int ctr1 = 0; ctr1 < ids.Count;ctr1++) 
        { 
            addVert = (Vertex2d) trans.GetObject((ObjectId)ids[ctr], OpenMode.ForRead); 
            Vertex2d vertClone = (Vertex2d)addVert.Clone(); 
            srcPLine.AppendVertex(vertClone); 
            trans.AddNewlyCreatedDBObject(vertClone, true); 
            ctr += step; 
        }      
        trans.Commit(); 
        trans.Dispose(); 
        //Delete the old polyline 
        trans = HostApplicationServices.WorkingDatabase.TransactionManager.StartTransaction(); 
        addPLine = (Polyline2d)trans.GetObject(joinId, OpenMode.ForWrite);                                             
        addPLine.Erase(); 
        //Commit the transaction 
        trans.Commit(); 
 
        Application.DocumentManager.MdiActiveDocument.Editor.WriteMessage("\nAdded " + ctr.ToString() +" vertices."); 
    } 
    catch (System.Exception es) 
    { 
        //Application.DocumentManager.MdiActiveDocument.Editor.WriteMessage(es.Message); 
    } 
    finally    
    { 
        trans.Dispose(); 
    } 
}

[/sell]

zjy2999 · 发表于 2016-11-4 15:48:47

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jwj0805 · 发表于 2016-11-4 22:03:26

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qq509103902 · 发表于 2016-11-17 13:32:34

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lhtfhc · 发表于 2016-11-21 16:07:42

学习中，谢谢楼主分享

ppstudy369 · 发表于 2017-2-16 19:10:28

学习一下～

wanglumi · 发表于 2017-2-22 17:57:25

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dnbcgrass · 发表于 2017-2-25 14:23:40

回复学习学习！

wangjunjun · 发表于 2017-4-11 23:30:12

“我来测试一下，行不行”

Lizzhao · 发表于 2017-6-24 15:08:20

学习一下

Lizzhao · 发表于 2017-6-24 15:09:34

学习一下

yuanziyou · 发表于 2017-10-15 10:36:58

学习使人进步，感谢分享

yuanziyou · 发表于 2017-10-15 10:38:31

学习使人进步，感谢分享

ScmTools · 发表于 2017-11-23 21:13:42

thank you for share

116349046 · 发表于 2017-11-30 14:53:28

我要看，快打开

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