[每日一码] XCLIP xrefs using ObjectARX

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1. static void MyTestApp采用MyClip()
2. {
3.     ads采用point pt1,pt2;
4.     ads采用name ent;
5.     if (acedEntSel(采用T("Select xref:"),ent,pt1)!=RTNORM)
6.         return;
7.     AcDbObjectId idXref;
8.     if (acdbGetObjectId(idXref,ent)!=Acad::eOk)
9.         return;
10.     AcDbObjectPointer<AcDbBlockReference> pRef(idXref,AcDb::kForRead);
11.     if (pRef.openStatus()!=Acad::eOk)
12.     {
13.         acutPrintf(采用T("Not an xref!\n"));
14.         return;
15.     }
16.     AcGePoint2dArray pts;
17.     if (acedGetPoint(NULL,采用T("First point:"),pt1)!=RTNORM)
18.         return;
19.     //the ECS of the vertices must be defined in the
20.     //coordinate system of the 采用block采用 so let's calculate
21.     //transform all points to that coordinate system
23.     AcGeMatrix3d mat(pRef->blockTransform());
24.     mat.invert();
26.     AcGePoint3d pt3d(asPnt3d(pt1));
27.     pt3d.transformBy(mat);
28.     pts.append(AcGePoint2d(pt3d.x,pt3d.y));
29.     while (acedGetPoint(pt1,采用T("Next point:"),pt2)==RTNORM)
30.     {
31.         acedGrDraw(pt1,pt2,1,1);
32.         pt3d = asPnt3d(pt2);
33.         pt3d.transformBy(mat);
34.         pts.append(AcGePoint2d(pt3d.x,pt3d.y));
35.         memcpy(pt1,pt2,sizeof(ads采用point));
36.     }
37.     acedRedraw(NULL,0);
38.     AcDbDatabase* pDb = acdbHostApplicationServices()->workingDatabase();
39.     AcGeVector3d normal;
40.     double elev;
41.     if (pDb->tilemode())
42.     {
43.         normal = pDb->ucsxdir().crossProduct(pDb->ucsydir());
44.         elev = pDb->elevation();
45.     }
46.     else
47.     {
48.         normal = pDb->pucsxdir().crossProduct(pDb->pucsydir());
49.         elev = pDb->pelevation();
50.     }
51.     normal.normalize();
52.     Acad::ErrorStatus es = pRef.object()->upgradeOpen();
53.     if (es !=Acad::eOk)
54.         return;
55.     //create the filter
56.     AcDbSpatialFilter* pFilter = new AcDbSpatialFilter;
57.     if (pFilter->setDefinition(pts,normal,elev,
58.         ACDB采用INFINITE采用XCLIP采用DEPTH,-ACDB采用INFINITE采用XCLIP采用DEPTH,true)!=Acad::eOk)
59.     {
60.         delete pFilter;
61.         return;
62.     }
63.     //add it to the extension dictionary of the block reference
64.     //the AcDbIndexFilterManger class provides convenient utility functions
65.     if (AcDbIndexFilterManager::addFilter(pRef.object(),pFilter)!=Acad::eOk)
66.         delete pFilter;
67.     else
68.     {
69.         acutPrintf(采用T("Filter has been succesfully added!\n"));
70.         pFilter->close();
71.     }
73. }

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