[每日一码] 图块位置不变的情况下重设块的插入点

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1. void ResetAllInstances(AcDbBlockTableRecord * pBlockTableRecord, AcGeVector3d &translation)
2. {
4. // Note that this function does not implement any error checking.
5. // We are assuming that pBlockTableREcord was opened for write by the calling function
7. // Iterate through all block references of this block table record.
8. AcDbBlockReferenceIdIterator * pIterator;
9. pBlockTableRecord->newBlockReferenceIdIterator(pIterator);
10. for (pIterator->start();!pIterator->done();pIterator->step())
11. {
12.   AcDbBlockReference * pBlockRef;
13.   pIterator->getBlockReference(pBlockRef, AcDb::kForWrite,true);
15.   // Transform the translation vector from block coordinates to world coordinates.
16.   AcGeVector3d realTranslation = (pBlockRef->blockTransform())*translation;
18.   // Translate the block reference to counter the effect of the origin change.
19.   pBlockRef->setPosition(pBlockRef->position()+realTranslation);
22.   pBlockRef->close();
23. } // Next block reference
24. delete pIterator;
25. }
28. // This is command 'SGP'
29. void testFunc()
30. {
32. // Note that error checking is minimal.
34. ads采用name ename ;
35. ads采用point pt ;
37. // Ask the user to select an object
38. if( acedEntSel ("\nSelect the Block Reference", ename, pt) != RTNORM )
39.   return ;
41. // Open it
42. AcDbObjectId objId;
43. acdbGetObjectId (objId, ename) ;
44. AcDbEntity * pEnt;
45. acdbOpenObject (pEnt, objId, AcDb::kForRead);
47. // Check its a block reference
48. AcDbBlockReference *pRef = AcDbBlockReference::cast(pEnt);
49. if (pRef == NULL)
50. {
51.   pEnt->close();
52.   return;
53. }
55. // Get the block reference's associated block table record.
56. AcDbObjectId blockId =pRef->blockTableRecord ();
57. pRef->close();
58. AcDbBlockTableRecord *pBlockTableRecord;
59. acdbOpenObject (pBlockTableRecord, blockId, AcDb::kForWrite);
61. // Store the BTR's current origin (we'll need it later).
62. AcGePoint3d origin = pBlockTableRecord->origin();
64. // And set its new origin to (0, 0, 0)
65. pBlockTableRecord->setOrigin(AcGePoint3d(0, 0, 0));
68. // Create a translation vector for the change in displacement required to offset the origin change (in the block's coordinate system)
69. AcGeVector3d translation;
70. translation.set(-origin[X], -origin[Y], -origin[Z]);
72. // Now process all instances of this block reference to compensate for the change in the block origin
73. ResetAllInstances(pBlockTableRecord, translation);
75. pBlockTableRecord->close();
76. }

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