ARX关于块的相关疑难问题整理

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获取裁剪块的边界

1. bool TransModelHelper::drawAPlineWithPropertiesFromBlockRef(AcGePoint2dArray pts, AcDbBlockReference* ref, double elevation, AcGeVector3d& normal)
2. {
3.         AcDbPolyline *pl = new AcDbPolyline;
4.         AcDbObjectId owner;
5.         pl->setDatabaseDefaults();
6.         pl->setClosed(Adesk::kTrue);
7.         pl->setThickness(0.0);
8.         if (ref != NULL)
9.         {
10.                 owner = ref->ownerId();
11.                 pl->setPropertiesFrom(ref);
12.         }
13.         pl->setNormal(normal);
15.         for (int i = 0; i < pts.length(); i++)
16.         {
17.                 pl->addVertexAt(i, pts[i]);
18.         }
20.         pl->setElevation(elevation);
21.         pl->setColorIndex(1); // Red
23.         AcDbBlockTableRecord *rec = NULL;
24.         acdbOpenObject(rec, owner, AcDb::kForWrite);
25.         if (rec != NULL)
26.         {
27.                 AcDbObjectId id;
28.                 rec->appendAcDbEntity(id, pl);
29.                 pl->close();
30.                 rec->close();
31.         }
32.         else
33.         {
34.                 delete pl;
35.                 return false;
36.         }
37.         return true;
38. }
40. bool TransModelHelper::GetBlockClippingPolyline(ads采用name blk, AcGePoint3dArray& pts3d)
41. {
42.         BOOL ret = FALSE;
43.         AcDbBlockReference *ref = NULL;
44.         AcDbObjectId insId = AcDbObjectId::kNull;
45.         acdbGetObjectId(insId, blk);
46.         if (acdbOpenObject(ref, insId, AcDb::kForRead) != Acad::eOk)
47.                 return ret;
49.         // Find the clipping object (AcDbSpatialFilter) in the ExtDict of the BlockRef
50.         AcDbObjectId extDicId = ref->extensionDictionary();
51.         if (extDicId == AcDbObjectId::kNull)
52.                 return ret;
53.         AcDbDictionary *extDict = NULL, *acadFilterDict = NULL;
54.         if (acdbOpenObject(extDict, extDicId, AcDb::kForRead) != Acad::eOk)
55.                 return ret;
57.         Acad::ErrorStatus err = extDict->getAt(采用T("ACAD采用FILTER"), (AcDbObject*&)acadFilterDict, AcDb::kForRead);
58.         extDict->close();
59.         if (err != Acad::eOk)
60.                 return ret;
61.         AcDbSpatialFilter *filter = NULL;
62.         err = acadFilterDict->getAt(采用T("SPATIAL"), (AcDbObject*&)filter, AcDb::kForRead);
63.         acadFilterDict->close();
64.         if (err != Acad::eOk)
65.                 return ret;
67.         // Get the transform matrix stored in the XClip boundary
68.         AcGeMatrix3d xformInBoundary = filter->getClipSpaceToWCSMatrix(xformInBoundary);
69.         // and the transform of the BlockRef at the time when the Filter was set
70.         AcGeMatrix3d xformRefOrig = filter->getOriginalInverseBlockXform(xformRefOrig);
71.         // Get the transform matrix that the current BlockRef has, so, we can find the difference
72.         // with the xformRefOrig
73.         AcGeMatrix3d refMatrix = ref->blockTransform();
74.         refMatrix = refMatrix.postMultBy(xformRefOrig);
75.         // Calculate the final transform matrix which applies to the points
76.         // returned from filter->getDefinition().
77.         AcGeMatrix3d finalMatrix = refMatrix.postMultBy(xformInBoundary);
78.        
79.         AcGePoint2dArray pts;
80.         //AcGePoint3dArray pts3d;
81.         AcGeVector3d normal;
83.         double elevation = 0, frontClip = 0, backClip = 0;
84.         Adesk::Boolean enabled = false;
85.         // Get all boundary points
86.         if (filter->getDefinition(pts, normal, elevation, frontClip, backClip, enabled) == Acad::eOk)
87.         {
88.                 // Rectanglar boundary
89.                 if (pts.length() == 2)
90.                 {
91.                         AcGePoint2d p1(pts[1].x, pts[0].y);
92.                         AcGePoint2d p3(pts[0].x, pts[1].y);
93.                         pts.insertAt(1, p1);
94.                         pts.insertAt(3, p3);
95.                 }
97.                 // Transform all points with the transform matrix we calculated
98.                 for (int i = 0; i < pts.length(); i++)
99.                 {
100.                         AcGePoint2d pt2d;
101.                         AcGePoint3d pt3d;
102.                         pt2d = pts[i];
103.                         pt3d[0] = pt2d[0]; pt3d[1] = pt2d[1]; pt3d[2] = 0;
104.                         pt3d.transformBy(finalMatrix);
105.                         pts3d.append(pt3d);
106.                 }
107.         }
109.         // Get the new normal and new ECS information for the polyline.
110.         AcGeVector3d xfnorm = normal.transformBy(finalMatrix);
111.         AcGeMatrix3d plineECS;
113.         AcDbPolyline* pline = new AcDbPolyline();
115.         pline->setNormal(xfnorm);
116.         pline->getEcs(plineECS);
117.         delete pline; pline = NULL;
119.         AcGeMatrix3d plineECSInv = plineECS.inverse();
121.         double xfelev = 0.0;
122.         for (int i = 0; i < pts.length(); i++)
123.         {
124.                 pts[i].x = pts3d[i].x;
125.                 pts[i].y = pts3d[i].y;
126.                 if (i == 0)
127.                         xfelev = pts3d[i].z;
128.                 // Should be identical to within roundoff
129.                 assert(fabs(xfelev - pts3d[i].z) < 1.0e-10);
130.         }
132.         // Show the boundary
133. #ifdef 采用RELEASE采用WITHDEBUG
134.         drawAPlineWithPropertiesFromBlockRef(pts, ref, xfelev, xfnorm);
135. #endif
137.         filter->close();
138.         ref->close();
139.         return true;
140. }
142. bool TransModelHelper::GetBlockClippingPolyline(AcDbObjectId idBlkRef, AcGePoint3dArray& pts3d)
143. {
144.         ads采用name snBlk;
145.         acdbGetAdsName(snBlk, idBlkRef);
146.         if (snBlk == NULL) return false;
147.         return GetBlockClippingPolyline(snBlk, pts3d);
148. }
150. //test：
151. //
152. //ads采用point pt1;
153. //ads采用name ent;
154. //if (acedEntSel(采用T("请选择裁剪的块:"), ent, pt1) != RTNORM)
155. //return;
156. //
157. //AcGePoint2dArray pts;
158. //if (!GetBlockClippingPolyline(ent, pts))
159. //return;

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