AcDbFace面域问题？？？？？？

dipenghao 发表于 2004-10-1 20:49:00

我问过这个问题了，但是还不明白。请版主帮忙解释一下：

一下是我的做法，不知道为什么求不出面积。

AcGePoint3d pA(0,0,0),pB(100,0,0),pC(100,100,0),pD(0,100,0); AcDbFace *pFace=new AcDbFace(pA,pB,pC,pD); postToDatabase(pFace,faceId);

ads_point pt1,pt2,pt; AcGePoint2dArray point_Array;

int stat=1; stat=acedGetPoint(NULL,"选择点(ESC结束)\n",pt1); if(stat==RTCAN) return; point_Array.append(asPnt2d(pt1)); while(1) { acdbPointSet(pt1, pt2); <A href="file://stat/" target="_blank" >file://stat</A> = acedGetPoint(pick, "选择下一点(ESC-quit): ", pick); stat=acedGetPoint(pt1,"选择点,(ESC结束)\n",pt1); acedGrDraw(pt2, pt1, 1, 0); if(stat==RTCAN) break; point_Array.append(asPnt2d(pt1)); } AcDbPolyline *ClosePolyline=new AcDbPolyline(); for(int i=0;i<point_Array.length();i++) { AcGePoint2d pTmp=point_Array.at(i); ClosePolyline->addVertexAt(i,pTmp,0,-1,-1); }

ClosePolyline->setColorIndex(1); ClosePolyline->setClosed(Adesk::kTrue); postToDatabase(ClosePolyline,IdObj); acdbOpenAcDbEntity(pEnt,IdObj,AcDb::kForRead); AcDbPolyline *pPoly=AcDbPolyline::cast(pEnt);

 AcDbVoidPtrArray entities,regions; entities.append(pFace); entities.append(pPoly); AcDbRegion::createFromCurves(entities, regions); if (regions.length() < 1) { acutPrintf("构造闭合区域错误\n"); } assert(pRegion != NULL); AcDbRegion *pRegion = new AcDbRegion; for ( i = 0; i < regions.length(); i++) { if(Acad::eOk!=pReg->booleanOper(AcDb::kBoolIntersect,(AcDbRegion*) regions)) acutPrintf("有问题\n"); delete (AcRxObject*)regions; } double regArea; pReg->getArea(regArea); pReg->close(); acutPrintf("area=%0.3f\n",regArea);

请高手指出错误。

王咣生 发表于 2004-10-1 22:08:00

能贴出你完整的代码吗?

没做过,只能帮你调试一下了.

dipenghao 发表于 2004-10-1 22:27:00

上面基本的程序放到一个函数里面即可。

版主可以看看<A href="http://bbs.mjtd.com/forum.php?mod=viewthread&tid=26604" target="_blank" >两个多边形相交，如何求两个图形的交集的面积？？</A> 帖子，

告诉我做法了，但是我没有求出结果。

基本思想。就是两个实体（闭合的）然后求出图形交集部分的面积

王咣生 发表于 2004-10-1 22:54:00

这里

<A href="file://stat/" target=_blank>file://stat</A> = acedGetPoint(pick, "选择下一点(ESC-quit): ", pick); stat=acedGetPoint(pt1,"选择点,(ESC结束)\n",pt1);

是什么? file:这一行需要吗?

postToDatabase也是未声明的?

很多未声明的标识符!

dipenghao 发表于 2004-10-1 23:02:00

那是注释掉得语句。粘贴到帖子上就加了file。不要。

postToDatabase()是把该实体添加到图形数据库中

王咣生 发表于 2004-10-1 23:10:00

没法调试, 这段代码中很多变量都是没有声明的.

postToDatabase

IdObj

pEnt

pRegion

pReg

...

因为我没做过,所以看不出应该怎么改.

postToDatabase是个自定义的函数

Acad::ErrorStatus postToDatabase(AcDbEntity* ent, AcDbObjectId& objId) { // Given an entity, this function will post it to the database // in MODEL_SPACE and then return the objectId; returns eOk if // all went well. Acad::ErrorStatus es; AcDbBlockTable* pBlockTable; AcDbBlockTableRecord* pSpaceRecord; es = acdbHostApplicationServices()->workingDatabase() ->getSymbolTable(pBlockTable, AcDb::kForRead);

assert(es == Acad::eOk); es = pBlockTable->getAt(ACDB_MODEL_SPACE, pSpaceRecord, AcDb::kForWrite); assert(es == Acad::eOk); es = pBlockTable->close(); assert(es == Acad::eOk); es = pSpaceRecord->appendAcDbEntity(objId, ent); assert(es == Acad::eOk); es = ent->close(); assert(es == Acad::eOk); es = pSpaceRecord->close(); assert(es == Acad::eOk); return es; }

dipenghao 发表于 2004-10-1 23:30:00

不好意思。我再发一次

void AppmytoolCloReg() { ads_point pt1,pt2,pt; AcGePoint2dArray point_Array; AcDbObjectId IdObj,faceId; AcDbEntity *pEnt=NULL;

 AcGePoint3d pA(0,0,0),pB(100,0,0),pC(100,100,0),pD(0,100,0); AcDbFace *pFace=new AcDbFace(pA,pB,pC,pD); postToDatabase(pFace,faceId);

int stat=1; stat=acedGetPoint(NULL,"选择点(ESC结束)\n",pt1); if(stat==RTCAN) return; point_Array.append(asPnt2d(pt1)); while(1) { acdbPointSet(pt1, pt2); stat=acedGetPoint(pt1,"选择点,(ESC结束)\n",pt1); acedGrDraw(pt2, pt1, 1, 0); if(stat==RTCAN) break; point_Array.append(asPnt2d(pt1)); } AcDbPolyline *ClosePolyline=new AcDbPolyline(); for(int i=0;i<point_Array.length();i++) { AcGePoint2d pTmp=point_Array.at(i); ClosePolyline->addVertexAt(i,pTmp,0,-1,-1); }

ClosePolyline->setColorIndex(1); ClosePolyline->setClosed(Adesk::kTrue); postToDatabase(ClosePolyline,IdObj);//添加实体数据库中

acdbOpenAcDbEntity(pEnt,IdObj,AcDb::kForRead); AcDbPolyline *pPoly=AcDbPolyline::cast(pEnt);

AcDbVoidPtrArray entities,regions; entities.append(pFace); entities.append(pPoly); AcDbRegion::createFromCurves(entities, regions); if (regions.length() < 1) { acutPrintf("构造闭合区域错误\n"); } assert(pRegion != NULL); AcDbRegion *pRegion = new AcDbRegion; for ( i = 0; i < regions.length(); i++) { if(Acad::eOk!=pRegion->booleanOper(AcDb::kBoolIntersect,(AcDbRegion*)regions)) acutPrintf("有问题\n"); delete (AcRxObject*)regions; } double regArea; pRegion->getArea(regArea); pRegion->close(); pEnt->close();

acutPrintf("area=%0.3f\n",regArea); }

Acad::ErrorStatus postToDatabase(/**/AcDbEntity* pEnt,/**/AcDbObjectId& idObj)

{ Acad::ErrorStatus es; AcDbBlockTable* pBlockTable; AcDbBlockTableRecord* pSpaceRecord; if (acdbHostApplicationServices()->workingDatabase()==NULL) return Acad::eNoDatabase; if ((es = acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlockTable, AcDb::kForRead))==Acad::eOk){ if ((es = pBlockTable->getAt(ACDB_MODEL_SPACE, pSpaceRecord, AcDb::kForWrite))==Acad::eOk){ if ((es = pSpaceRecord->appendAcDbEntity(idObj, pEnt))==Acad::eOk) pEnt->close(); pSpaceRecord->close(); } pBlockTable->close();

} return es; }

hchdown 发表于 2008-9-22 17:39:00

先求交点,再创建一个新的面或多线段,面积就出来了

页: [1]

明经CAD社区's Archiver

AcDbFace面域问题？？？？？？

回复

回复

回复