AcDbSection 从正面创建实体的 2D 轮廓

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1. void ClearCollection(AcArray<AcDbEntity *> &arr)
2. {
3.     for (AcDbEntity *ent : arr) {
4.         if (ent) {
5.             if (!ent->database())
6.                 delete ent;
7.             else
8.                 ent->close();
9.         }
10.     }
11.     arr.setLogicalLength(0);
12. }
14. Acad::ErrorStatus appendWithColor(AcArray<AcDbEntity *> &arr,
15.                                   AcDbBlockTableRecord *btr, uint16采用t col)
16. {
17.     Acad::ErrorStatus esRet = Acad::eOk, es;
18.     for (AcDbEntity *ent : arr) {
19.         if (ent != nullptr) {
20.             // Note that my implementation of ClearCollection() just close()s
21.             // DB-resident entities Non resident entities will be deleted.
22.             ent->setDatabaseDefaults(btr->database());
23.             ent->setColorIndex(col);
24.             es = btr->appendAcDbEntity(ent);
25.             // we don't close ent!
26.             if (es) esRet = es;
27.         }
28.     }
29.     return esRet;
30. }
32. void cgsa采用section()
33. {
34.     Acad::ErrorStatus es;
35.     AcDb3dSolid *solid = nullptr;
36.     ads采用name ename;
37.     ads采用point pt;
38.     if (acedEntSel(L"\nPick a solid: ", ename, pt) != RTNORM) return;
39.     AcDbObjectId idSolid;
40.     es = acdbGetObjectId(idSolid, ename);
41.     if (!es) {
42.         es = acdbOpenObject(solid, idSolid);
43.         if (!es) {
44.         }
45.     }
46.     else
47.         return;
49.     AcDbExtents extents;
50.     solid->getGeomExtents(extents);
52.     auto minX = extents.minPoint().x;
53.     auto minY = extents.minPoint().y;
54.     auto minZ = extents.minPoint().z;
55.     auto maxX = extents.maxPoint().x;
56.     auto maxY = extents.maxPoint().y;
57.     auto maxZ = extents.maxPoint().z;
58.     AcGePoint3dArray sectVertices;
59.     sectVertices.append(AcGePoint3d(minX, minY, minZ));
60.     sectVertices.append(AcGePoint3d(minX, maxY, minZ));
61.     AcDbDatabase *db = solid->database();
62.     AcDbSection *pSection = new AcDbSection(sectVertices, AcGeVector3d::kZAxis);
63.     pSection->setDatabaseDefaults(db);
64.     AcDbSection &section = *pSection;
65.     AcDbSectionSettings* pSettings;
66.     section.getSettings(pSettings, AcDb::kForWrite);
67.     section.setState(AcDbSection::kPlane);
68.         es = pSection->setHeight(AcDbSection::kHeightAboveSectionLine, 100);
69.     es = pSection->setHeight(AcDbSection::kHeightBelowSectionLine, -100);
71.     AcArray<AcDbEntity *> intBoundaryEnts;
72.     AcArray<AcDbEntity *> intFillEnts;
73.     AcArray<AcDbEntity *> backgroundEnts;
74.     AcArray<AcDbEntity *> foregroundEnts;
75.     AcArray<AcDbEntity *> curveTangencyEnts;
77.     es = section.generateSectionGeometry(solid, intBoundaryEnts, intFillEnts,
78.                                          backgroundEnts, foregroundEnts,
79.                                          curveTangencyEnts);
80.     if (es == Acad::eOk) {
81.         AcGeMatrix3d mat;
82.         mat.setToTranslation(AcGeVector3d(1000, 0, 0));
84.         AcDbObjectId idModelSpace = acdbSymUtil()->blockModelSpaceId(db);
85.         AcDbBlockTableRecord *modelspace;
86.         es = acdbOpenObject(modelspace, idModelSpace, AcDb::kForWrite);
87.         if (!es) {
88.             es = modelspace->appendAcDbEntity(pSection);
89.             if (!es)
90.                 pSection->close();
91.             else
92.                 delete pSection;
93.             appendWithColor(intBoundaryEnts, modelspace, 1);
94.             appendWithColor(intFillEnts, modelspace, 2);
95.             appendWithColor(backgroundEnts, modelspace, 3);
96.             appendWithColor(foregroundEnts, modelspace, 4);
97.             appendWithColor(curveTangencyEnts, modelspace, 5);
98.             modelspace->close();
99.         }
100.     }
102.     ClearCollection(intBoundaryEnts);
103.     ClearCollection(intFillEnts);
104.     ClearCollection(backgroundEnts);
105.     ClearCollection(foregroundEnts);
106.     ClearCollection(curveTangencyEnts);
107. }

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