[ARX程序]：请问：ARX如何构造面域？

fyje

谢谢

XDSoft

给你贴个函数，从AcGePoint3dArray顶点表，建立一个REGION

1. 
   
2. [FONT=courier new]
   
3. // 参数AcGePoint3dArray
   
4. // 用顶点表创建REGION.
   
5. AcDbObjectId CreateRegionFromPoints(AcGePoint3dArray InPoints)
   
6. {
   
7.         // 创建polyline.
   
8.         AcDbObjectId polylineID = NULL;
   
9.         polylineID = createPolyline(InPoints);
   
10. 
    
11.         // 打开POLYLINE.
    
12.         AcDbEntity* pPolyline;
    
13.         AcDbObjectId regionId;
    
14.         acdbOpenAcDbEntity(pPolyline, polylineID, AcDb::kForRead);
    
15. 
    
16.         // 用polyline 创建REGION
    
17.         AcDbVoidPtrArray polylineArray;
    
18.         polylineArray.append(static_cast<void*>(pPolyline));
    
19.         AcDbVoidPtrArray regions;
    
20.         AcDbRegion::createFromCurves(polylineArray, regions);
    
21.         AcDbRegion *pRegion = NULL;
    
22.         pRegion = AcDbRegion::cast((AcRxObject*)regions[0]);
    
23. 
    
24.         pPolyline->close();
    
25. 
    
26.         // 添加REGION到数据库
    
27.         AcDbBlockTable* pBlockTable;
    
28.         acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlockTable, AcDb::kForRead);
    
29. 
    
30.         AcDbBlockTableRecord* pBlockTableRecord;
    
31.         pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite);
    
32.         pBlockTable->close();
    
33. 
    
34.     AcDbRegion* regionObj = static_cast<AcDbRegion*>(regions[0]);
    
35.         pBlockTableRecord->appendAcDbEntity(regionId, regionObj);
    
36. 
    
37.         pBlockTableRecord->close();
    
38.         regionObj->close();
    
39. 
    
40.         // 返回REGION的ID.
    
41.         return regionId;
    
42. }
    
43. [/FONT]

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rave

构造含ELLIPSE,SPLINE的Region

1. 
   
2. // 构造Region(s) 从选择集创建Region,返回创建的Region数目
   
3. int Curves2Region(ads_name ssCurves,AcDbVoidPtrArray& regions)
   
4. {
   
5.         long ssLen,i,j;
   
6. 
   
7.         if (RTNORM!=acedSSLength(ssCurves,&ssLen)){
   
8.                 acedPrompt("\nSSLength Error!\n");
   
9.                 return 0;
   
10.         }
    
11.         if (ssLen< 1){
    
12.                 acedPrompt("\n未选中任何实体!\n");
    
13.                 return 0;
    
14.         }
    
15. 
    
16.         Acad::ErrorStatus es;
    
17.         AcDbVoidPtrArray curveSegments;
    
18.        
    
19.         ads_name rtEnt;//选中实体
    
20.         AcDbCurve *pCurve=NULL;
    
21.         AcDbObjectId ObjId;
    
22. 
    
23.         for(i=0;i< ssLen;i++){
    
24.                 acedSSName(ssCurves,i,rtEnt);
    
25.                 acdbGetObjectId(ObjId,rtEnt);
    
26.                 if (acdbOpenObject(pCurve,ObjId,AcDb::kForRead) != Acad::eOk)
    
27.                 {//无法打开
    
28.                         acdbFail("\n无法打开!");
    
29.                         for(j=0;j< i;j++){
    
30.                                 ((AcDbCurve *)curveSegments[j])->close();
    
31.                         }
    
32.                         return 0;
    
33.                 }else
    
34.                         curveSegments.append(pCurve);
    
35.         }
    
36.        
    
37.         es=AcDbRegion::createFromCurves(curveSegments,regions);
    
38. 
    
39.         for(j=0;j< curveSegments.length();j++)
    
40.                         ((AcDbCurve *)curveSegments[j])->close();
    
41. 
    
42.         if (es==Acad::eOk)
    
43.                 return regions.length();
    
44.         else return -regions.length();
    
45. }
    
46. // 在屏幕选择可构成Region的曲线，得到Region
    
47. AcDbRegion* GetRegion()
    
48. {       
    
49.         struct resbuf *eb1;
    
50.         AcDbRegion *pResultRgn=NULL;
    
51. 
    
52.         int nRgns,i,rt;
    
53.         AcDbVoidPtrArray regions;
    
54.         ads_name ssCurves;
    
55.                                
    
56.         eb1=acutBuildList(RTDXF0,"CIRCLE,LINE,ARC,LWPOLYLINE,POLYLINE,ELLIPSE,SPLINE",0);
    
57.         if (eb1==NULL) return NULL;
    
58.         rt=acedSSGet(NULL,NULL,NULL,eb1,ssCurves);
    
59.         acutRelRb(eb1);
    
60.         if (rt!=RTNORM) return NULL;
    
61. 
    
62.         nRgns=Curves2Region(ssCurves,regions);
    
63.         acedSSFree(ssCurves);
    
64.         if (nRgns!=1) {
    
65.                 for(i=0;i< abs(nRgns);i++){
    
66.                         delete (AcDbObject *)regions[i];
    
67.                 }
    
68.                 return NULL;
    
69.         }else
    
70.         pResultRgn=(AcDbRegion *)regions[0];
    
71.         return pResultRgn;
    
72. }
    

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XDSoft

接着贴一个，创建REGION后，创建AcDb3dSolid的函数

2. 
   
3. [FONT=courier new]
   
4. // Given a region create a solid extrusion.
   
5. AcDbObjectId CreateSolidExtrusion(AcDbObjectId RegionId, double Height, double Taper)
   
6. {
   
7.         AcDbObjectId solidId;
   
8. 
   
9.         // Get the AcDbEntity for the input region.
   
10.         AcDbEntity* pRegion;
    
11.         acdbOpenAcDbEntity(pRegion, RegionId, AcDb::kForRead);
    
12. 
    
13.         // Create a solid using the region.
    
14.         AcDb3dSolid* solid = new AcDb3dSolid;
    
15.         assert(solid != NULL);
    
16.         solid->extrude(static_cast<AcDbRegion*>(pRegion), Height, Taper);
    
17.         pRegion->close();
    
18. 
    
19.         // Add the solid to the database
    
20.         AcDbBlockTable* pBlockTable;
    
21.         acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlockTable, AcDb::kForRead);
    
22.         AcDbBlockTableRecord* pBlockTableRecord;
    
23. 
    
24.         pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite);
    
25.         pBlockTable->close();
    
26. 
    
27.         pBlockTableRecord->appendAcDbEntity(solidId, solid);
    
28. 
    
29.         pBlockTableRecord->close();
    
30.         solid->close();
    
31. 
    
32.         // Return the ID of the solid.
    
33.         return solidId;
    
34. }
    
35. [/FONT]

<br /> [FONT=courier new]<br /> // Given a region create a solid extrusion.<br /> AcDbObjectId CreateSolidExtrusion(AcDbObjectId RegionId, double Height, double Taper)<br /> {<br />         AcDbObjectId solidId;<br /> <br />         // Get the AcDbEntity for the input region.<br />         AcDbEntity* pRegion;<br />         acdbOpenAcDbEntity(pRegion, RegionId, AcDb::kForRead);<br /> <br />         // Create a solid using the region.<br />         AcDb3dSolid* solid = new AcDb3dSolid;<br />         assert(solid != NULL);<br />         solid->extrude(static_cast<AcDbRegion*>(pRegion), Height, Taper);<br />         pRegion->close();<br /> <br />         // Add the solid to the database<br />         AcDbBlockTable* pBlockTable;<br />         acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlockTable, AcDb::kForRead);<br />         AcDbBlockTableRecord* pBlockTableRecord;<br /> <br />         pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite);<br />         pBlockTable->close();<br /> <br />         pBlockTableRecord->appendAcDbEntity(solidId, solid);<br /> <br />         pBlockTableRecord->close();<br />         solid->close();<br /> <br />         // Return the ID of the solid.<br />         return solidId;<br /> }<br /> [/FONT]

fyje

Region合并怎么实现呢？

XDSoft

最初由 fyje 发布
[B]Region合并怎么实现呢？ [/B]

ACAD数据库对象都有自己的方法，看联机帮助查看AcDbRegion类的编辑方法（因为合并，一定是编辑，不是查询），见下面：

合并、交、差都在AcDbRegion::booleanOper 方法里面实现的。

2. 
   
3. [FONT=courier new]
   
4. AcDbRegion::booleanOper Function virtual Acad::ErrorStatus
   
5. 
   
6. booleanOper(
   
7. 
   
8. AcDb::BoolOperType operation,
   
9. 
   
10. AcDbRegion* otherRegion);
    
11. 
    
12. operation Input type of Boolean operation. Possible types are:
    
13. AcDb::kBoolUnite
    
14. AcDb::kBoolIntersect
    
15. AcDb::kBoolSubtract
    
16. otherRegion Input pointer to another region to perform the Boolean operation
    
17. 
    
18. Performs Boolean operation between this region and otherRegion.
    
19. 
    
20. If the Boolean operation is successful, then otherRegion's ACIS object is deleted (so its isNull() method returns Adesk::kTrue) and Acad::eOk is returned.
    
21. 
    
22. If otherRegion is NULL, then Acad::eInvalidInput is returned.
    
23. 
    
24. If the Boolean operation between the two regions fails, then the ACIS objects of both regions are deleted and either Acad::eNonCoplanarGeometry or Acad::eGeneralModelingFailure is returned. The Acad::eNonCoplanarGeometry status indicates the two regions were found to be in different planes
    
25. [/FONT]

<br /> [FONT=courier new]<br /> AcDbRegion::booleanOper Function virtual Acad::ErrorStatus<br /> <br /> booleanOper(<br /> <br /> AcDb::BoolOperType operation,<br /> <br /> AcDbRegion* otherRegion);<br /> <br /> operation Input type of Boolean operation. Possible types are:<br /> AcDb::kBoolUnite<br /> AcDb::kBoolIntersect<br /> AcDb::kBoolSubtract <br /> otherRegion Input pointer to another region to perform the Boolean operation <br /> <br /> Performs Boolean operation between this region and otherRegion.<br /> <br /> If the Boolean operation is successful, then otherRegion's ACIS object is deleted (so its isNull() method returns Adesk::kTrue) and Acad::eOk is returned.<br /> <br /> If otherRegion is NULL, then Acad::eInvalidInput is returned.<br /> <br /> If the Boolean operation between the two regions fails, then the ACIS objects of both regions are deleted and either Acad::eNonCoplanarGeometry or Acad::eGeneralModelingFailure is returned. The Acad::eNonCoplanarGeometry status indicates the two regions were found to be in different planes<br /> [/FONT]

blueming

可以用AcDbCurve来实现啊,感觉上好象会更简单些