AcDbFace面域问题？？？？？？

dipenghao

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);
file://stat = 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

能贴出你完整的代码吗?


没做过,只能帮你调试一下了.

dipenghao

上面基本的程序放到一个函数里面即可。 版主可以看看两个多边形相交，如何求两个图形的交集的面积？？ 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

这里 file://stat = 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

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

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

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(/*[in]*/AcDbEntity* pEnt,/*[out]*/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

先求交点,再创建一个新的面或多线段,面积就出来了