arx 获取三维实体边、面，并高亮

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1. void
2. highlightEdge(const AcDbObjectId& objId, const int marker)
3. {
4.     TCHAR dummy[133]; // space for acedGetStringB pauses below
6.     AcDbEntity *pEnt;
7.     acdbOpenAcDbEntity(pEnt, objId, AcDb::kForRead);
8.     AcGePoint3d pickpnt;
9.     AcGeMatrix3d xform;
10.     int numIds;
11.     AcDbFullSubentPath *subentIds;
12.     pEnt->getSubentPathsAtGsMarker(AcDb::kEdgeSubentType,
13.         marker, pickpnt, xform, numIds, subentIds);
15.     // At this point the subentId's variable contains the
16.     // address of an array of AcDbFullSubentPath objects.
17.     // The array should be one element long, so the picked
18.     // edge's AcDbFullSubentPath is in subentIds[0].
19.     //
20.     // For objects with no edges (such as a sphere), the
21.     // code to highlight an edge is meaningless and must
22.     // be skipped.
23.     //
24.     if (numIds > 0) {
25.         // Highlight the edge.
26.         //
27.         pEnt->highlight(subentIds[0]);
29.         // Pause to let user see the effect.
30.         //
31.         acedGetString(0, 采用T("\npress <RETURN> to continue..."),
32.             dummy);
34.         // Unhighlight the picked edge.
35.         //
36.         pEnt->unhighlight(subentIds[0]);
38.         // Get a copy of the edge, and add it to the database.
39.         //
40.         AcDbEntity *pEntCpy = pEnt->subentPtr(subentIds[0]);
41.         AcDbObjectId objId;
42.         addToModelSpace(objId, pEntCpy);
44.     }
45.     delete []subentIds;
47.     pEnt->close();
48. }
49. void
50. highlightFaces(const AcDbObjectId& objId, const int marker)
51. {
52.     TCHAR dummy[133];
54.     AcDbEntity *pEnt;
55.     acdbOpenAcDbEntity(pEnt, objId, AcDb::kForRead);
57.     // Get the subentIds for the faces.
58.     //
59.     AcGePoint3d pickpnt;
60.     AcGeMatrix3d xform;
61.     int numIds;
62.     AcDbFullSubentPath *subentIds;
63.     pEnt->getSubentPathsAtGsMarker(AcDb::kFaceSubentType,
64.         marker, pickpnt, xform, numIds, subentIds);
66.     // Walk the subentIds list, highlighting each face subentity.
67.     //
68.     for (int i = 0;i < numIds; i++) {
69.         pEnt->highlight(subentIds[i]); // Highlight face.
71.         // Pause to let the user see the effect.
72.         //
73.         acedGetString(0, 采用T("\npress <RETURN> to continue..."),
74.             dummy);
76.         pEnt->unhighlight(subentIds[i]);
77.     }
78.     delete []subentIds;
79.     pEnt->close();
80. }
81. void
82. highlightAll(const AcDbObjectId& objId)
83. {
84.     TCHAR dummy[133];
86.     AcDbEntity *pEnt;
87.     acdbOpenAcDbEntity(pEnt, objId, AcDb::kForRead);
89.     // Highlight the whole solid.
90.     //
91.     pEnt->highlight();
93.     // Pause to let user see the effect.
94.     //
95.     acedGetString(0, 采用T("\npress <RETURN> to continue..."),
96.         dummy);
98.     pEnt->unhighlight();
99.     pEnt->close();
100. }
103. Acad::ErrorStatus
104. addToModelSpace(AcDbObjectId &objId, AcDbEntity* pEntity)
105. {
106.     AcDbBlockTable *pBlockTable;
107.     AcDbBlockTableRecord *pSpaceRecord;
109.     acdbHostApplicationServices()->workingDatabase()
110.         ->getSymbolTable(pBlockTable, AcDb::kForRead);
112.     pBlockTable->getAt(ACDB采用MODEL采用SPACE, pSpaceRecord,
113.         AcDb::kForWrite);
115.     pSpaceRecord->appendAcDbEntity(objId, pEntity);
117.     pBlockTable->close();
118.     pEntity->close();
119.     pSpaceRecord->close();
121.     return Acad::eOk;
122. }

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