highflybird 发表于 2011-12-21 01:33:18

本帖最后由 highflybird 于 2011-12-21 01:36 编辑


//选择物体
int ret;
ads_point pt,pt1,pt2;
ads_name ename;
ret = acedEntSel(_T("\n请选择曲线类物体："),ename,pt);
if (RTNORM != ret)
{
acutPrintf(_T("\n选择无效，程序返回。"));
return;
}
//判断是否曲线类物体
Acad:;ErrorStatus es;
AcDbEntity *pEnt = NULL;
AcDbObjectId id;
es = acdbGetObjectId(id,ename);
es = acdbOpenAcDbEntity(pEnt,id,AcDb::kForRead);
if (es != Acad::eOk)
{
return;
}
if (!pEnt->isKindOf(AcDbCurve::desc()))
{
pEnt->close();
acutPrintf(_T("\n选择物体不是曲线，程序返回。"));
return ;
}
//输入偏移方向
double offDist;
ret = acedGetPoint(NULL,_T("\n点取偏移方向："),pt1);
if (RTNORM != ret)
{
acutPrintf(_T("\n点取无效，程序返回。"));
return;
}
//输入偏移距离
ret = acedGetDist(pt1,_T("\n偏移距离："),&offDist);
if (RTNORM != ret)
{
acutPrintf(_T("\n输入距离无效，程序返回。"));
return;
}
//此段用语判断偏移的方向
AcDbCurve * pCurve = (AcDbCurve *)(pEnt);
AcDbVoidPtrArrayCurves;
AcGePoint3d pt3d1 = asPnt3d(pt1);
AcGePoint3d pt3d2,pt3d3;
AcGeVector3d vec,vec1;
AcGeVector3d nrm;
es = pCurve->getClosestPointTo(pt3d1,pt3d2);
es = pCurve->getFirstDeriv(pt3d2,vec);
pt3d3 = pt3d2 + vec;
vec1 = pt3d1 -pt3d2;
double area = vec.y * vec1.x - vec.x * vec1.y ;
//如果是直线或者射线之类的物体，偏移距离需要反号
if (pCurve->isKindOf(AcDbLine::desc()) || pCurve->isKindOf(AcDbXline::desc()) || pCurve->isKindOf(AcDbRay::desc()))
{
offDist = - offDist;
}
//如果是顺时针旋转，则偏移距离需要反号
if (area > 0)
{
es = pCurve->getOffsetCurves(offDist,Curves);
}
else
{
es = pCurve->getOffsetCurves(-offDist,Curves);
}
pCurve->close();
//现在已经得到偏移的曲线集了，剩下的的工作是添加到空间中去。
pEnt = NULL;
AcDbBlockTable *pBlockTable;
acdbHostApplicationServices()->workingDatabase()->getSymbolTable(pBlockTable, AcDb::kForRead);
AcDbBlockTableRecord *brec;
resbuf tilemode;
acedGetVar(_T("TILEMODE"),&tilemode);
int tile = tilemode.resval.rint;
if (tile == 1)
pBlockTable->getAt(ACDB_MODEL_SPACE, brec,AcDb::kForWrite);
else
pBlockTable->getAt(ACDB_PAPER_SPACE, brec,AcDb::kForWrite);
pBlockTable->close();
AcDbObjectId entid;
for (int i = 0;i< Curves.length();i++)
{
   pEnt =(AcDbEntity *) Curves[ i ] ;
   brec->appendAcDbEntity(entid, pEnt);
   pEnt->close();
}
brec->close();
acutPrintf(_T("\n偏移成功！"));



c735023723 发表于 2011-12-23 09:59:45

highflybir 发表于 2011-12-20 23:07 static/image/common/back.gif
已知一个点pt ,和曲线curve,获得pt在曲线的getclosestpointto（最近点），获得此处的firstDeriv，由此得到 ...

谢谢，明白了
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查看完整版本: 如何用ARX实现直线的offset偏移功能？