AcDbBlockReference::explode 失败

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AcDbBlockReference::explode fails

问题：

Why does AcDbBlockReference::explode produce incorrect results if there are
AcDbText or AcDbAttribute definition entities in the block that is exploded?

解答：

This isa known problem that is desribed in DevNote #TS36113.
AcDbBlockReference::explode internally calls AcDbText::getTransformedCopy that
produces incorrect results. The code below uses the code in DevNote #TS36113 to
explode an AcDbBlockReference correctly.

1. Acad::ErrorStatus safeExplode(const AcDbBlockReference* pRef,AcDbVoidPtrArray&entitySet)
   
2. {  
   
3. AcDbBlockTableRecord* pBTR;
   
4. Acad::ErrorStatus es;  
   
5. if ((es = acdbOpenAcDbObject((AcDbObject*&)pBTR, pRef->blockTableRecord(), AcDb::kForRead)) == Acad::eOk)
   
6. {   
   
7.   AcDbBlockTableRecordIterator* pIterator;
   
8.   if (pBTR->newIterator(pIterator) == Acad::eOk)
   
9.   {  
   
10.    AcGeMatrix3d xform = pRef->blockTransform();   
    
11.    AcGePoint3d pt3dBlkOrigin = pBTR->origin();  
    
12.    if (pt3dBlkOrigin != AcGePoint3d::kOrigin)
    
13.    {     
    
14.     AcGeVector3d xformOrigin = xform.translation();
    
15.     AcGeVector3d vectorOrigin(pt3dBlkOrigin.x,pt3dBlkOrigin.y,0.0);  
    
16.     vectorOrigin.transformBy(xform);
    
17.     xformOrigin -= vectorOrigin;   
    
18.     xform.setTranslation(xformOrigin);   
    
19.    }   
    
20.    pIterator->start();   
    
21.    while (!pIterator->done())
    
22.    {     
    
23.     AcDbEntity* pEntity;
    
24.     if (pIterator->getEntity(pEntity, AcDb::kForRead) == Acad::eOk)
    
25.     {
    
26.       // If pEntity does not implement getTransformedCopy()  
    
27.       // or explode() methods, we should simply ignore
    
28.       // that entity and continue to step into next entity
    
29.       // instead of exit prematurely. Most operations such
    
30.       // as BHATCH depends on complete iteration through  
    
31.       // the entire block entities.      
    
32.       AcDbEntity* pNewEntity;
    
33.       AcDbText* pText =NULL;   
    
34.       if (pText=AcDbText::cast(pEntity))  
    
35.        es = AdskUtil::safeGetTransformedCopy(pText,xform, pNewEntity);      
    
36.       else
    
37.       es = pEntity->getTransformedCopy(xform, pNewEntity);
    
38.       if (es==Acad::eOk)
    
39.       {
    
40.       entitySet.append(pNewEntity);
    
41.       }
    
42.       else if (Acad::eExplodeBeforeTransform == es)
    
43.       {
    
44.       AcDbVoidPtrArray explSet;  
    
45.       if (Acad::eOk == pEntity->explode(explSet))
    
46.       {
    
47.        for (int i = 0; i < explSet.length(); i++)
    
48.        {         
    
49.         AcDbEntity* pObj = (AcDbEntity*)explSet;
    
50.         if (Acad::eOk == pObj->getTransformedCopy( xform, pNewEntity))
    
51.         {     
    
52.          entitySet.append(pNewEntity);   
    
53.         }        
    
54.         delete pObj;     
    
55.        }  
    
56.       }  
    
57.      }
    
58.      else if (Acad::eCopyFailed == es)
    
59.      {            
    
60.       AcDbVoidPtrArray explSet;   
    
61.       if (Acad::eOk == pEntity->explode(explSet))
    
62.       {            
    
63.        for (int i = 0; i < explSet.length(); i++)     
    
64.        {           
    
65.         AcDbEntity* pObj = (AcDbEntity*)explSet;
    
66.         if (Acad::eOk == pObj->transformBy(xform))
    
67.         {         
    
68.          entitySet.append(pObj);
    
69.         }         
    
70.        }   
    
71.       }     
    
72.      }     
    
73.      pEntity->close();
    
74.     }  
    
75.     pIterator->step();
    
76.    }   
    
77.    delete pIterator;
    
78.   }  
    
79.   pBTR->close();
    
80. }
    
81. return es;
    
82. }
    

Acad::ErrorStatus safeExplode(const AcDbBlockReference* pRef,AcDbVoidPtrArray&entitySet)<br /> {  <br /> AcDbBlockTableRecord* pBTR; <br /> Acad::ErrorStatus es;  <br /> if ((es = acdbOpenAcDbObject((AcDbObject*&)pBTR, pRef->blockTableRecord(), AcDb::kForRead)) == Acad::eOk)<br /> {   <br />   AcDbBlockTableRecordIterator* pIterator; <br />   if (pBTR->newIterator(pIterator) == Acad::eOk) <br />   {  <br />    AcGeMatrix3d xform = pRef->blockTransform();   <br />    AcGePoint3d pt3dBlkOrigin = pBTR->origin();  <br />    if (pt3dBlkOrigin != AcGePoint3d::kOrigin)<br />    {     <br />     AcGeVector3d xformOrigin = xform.translation();<br />     AcGeVector3d vectorOrigin(pt3dBlkOrigin.x,pt3dBlkOrigin.y,0.0);  <br />     vectorOrigin.transformBy(xform); <br />     xformOrigin -= vectorOrigin;   <br />     xform.setTranslation(xformOrigin);    <br />    }   <br />    pIterator->start();    <br />    while (!pIterator->done())<br />    {     <br />     AcDbEntity* pEntity; <br />     if (pIterator->getEntity(pEntity, AcDb::kForRead) == Acad::eOk)<br />     {<br />       // If pEntity does not implement getTransformedCopy()  <br />       // or explode() methods, we should simply ignore<br />       // that entity and continue to step into next entity<br />       // instead of exit prematurely. Most operations such<br />       // as BHATCH depends on complete iteration through  <br />       // the entire block entities.      <br />       AcDbEntity* pNewEntity; <br />       AcDbText* pText =NULL;    <br />       if (pText=AcDbText::cast(pEntity))  <br />        es = AdskUtil::safeGetTransformedCopy(pText,xform, pNewEntity);      <br />       else<br />       es = pEntity->getTransformedCopy(xform, pNewEntity);<br />       if (es==Acad::eOk)<br />       {<br />       entitySet.append(pNewEntity); <br />       }<br />       else if (Acad::eExplodeBeforeTransform == es)<br />       {<br />       AcDbVoidPtrArray explSet;  <br />       if (Acad::eOk == pEntity->explode(explSet))<br />       { <br />        for (int i = 0; i < explSet.length(); i++)<br />        {         <br />         AcDbEntity* pObj = (AcDbEntity*)explSet<i>; <br />         if (Acad::eOk == pObj->getTransformedCopy( xform, pNewEntity)) <br />         {     <br />          entitySet.append(pNewEntity);   <br />         }        <br />         delete pObj;     <br />        }  <br />       }  <br />      }<br />      else if (Acad::eCopyFailed == es)<br />      {            <br />       AcDbVoidPtrArray explSet;    <br />       if (Acad::eOk == pEntity->explode(explSet))<br />       {             <br />        for (int i = 0; i < explSet.length(); i++)     <br />        {           <br />         AcDbEntity* pObj = (AcDbEntity*)explSet<i>; <br />         if (Acad::eOk == pObj->transformBy(xform)) <br />         {          <br />          entitySet.append(pObj);<br />         }          <br />        }    <br />       }     <br />      }     <br />      pEntity->close();<br />     }  <br />     pIterator->step();<br />    }   <br />    delete pIterator; <br />   }  <br />   pBTR->close(); <br /> }<br /> return es;<br /> }<br />