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我是一个ARX二次开发CAD的新手，做了一个尺寸自动标注的程序，部分代码如下：
AcDbDatabase *pcurdb=acdbHostApplicationServices()->workingDatabase();
AcDbDimStyleTable *pnewdimtable;
pcurdb->getSymbolTable(pnewdimtable,AcDb::kForWrite);
AcDbDimStyleTableRecord *pnewdimrecord=new AcDbDimStyleTableRecord();
pnewdimrecord->setDimasz(20);//设置箭头大小
pnewdimrecord->setDimzin(8);//十进制小数显示时，抑制后续零
pnewdimrecord->setDimexe(30);//设置尺寸界线超出尺寸线距离为400
pnewdimrecord->setDimexo(0);//设置尺寸界线的起点偏移量为300
pnewdimrecord->setDimtxt(30);//设置文字高度
pnewdimrecord->setDimtad(1);//设置文字位置-垂直为上方，水平默认为居中，不用设置
pnewdimrecord->setDimgap(10);//设置文字位置-从尺寸线的偏移量
pnewdimrecord->setDimtih(0);
pnewdimrecord->setDimtix(1);//设置标注文字始终绘制在尺寸界线之间
pnewdimrecord->setDimtofl(1);//即使箭头放置于测量点之外，尺寸线也将绘制在测量点之间
// pnewdimrecord->setDimgap(0.5);
color.setColorIndex(iDimColor);
pnewdimrecord->setDimclrd(color); //尺寸线颜色
pnewdimrecord->setDimclre(color); //尺寸边界线颜色
color.setColorIndex(iTextColor);
pnewdimrecord->setDimclrt(color); //文字颜色
AcDbObjectId dimrecordid;
pnewdimtable->add(dimrecordid,pnewdimrecord);
pnewdimtable->close();
pnewdimrecord->close();
AcGePoint3d Pt1(KD[k].ZB_X+t,KD[k].ZB_Y+t,0);
AcGePoint3d Pt2(DY.m_Chang+t,KD[k].ZB_Y+t,0);
AcGePoint3d Pt3(KD[k].ZB_X+t,DY.m_Kuan+t+150+k*70,0);
AcGePoint3d Pt6(KD[k].ZB_X+t-KD[k].KongJing/2*cos(PI/4.0),KD[k].ZB_Y+t+KD[k].KongJing/2*sin(PI/4.0),0);
AcGePoint3d Pt7(KD[k].ZB_X+t+KD[k].KongJing/2*cos(PI/4.0),KD[k].ZB_Y+t-KD[k].KongJing/2*sin(PI/4.0),0);
AcDbBlockTable *pBlockTable;//定义块表指针
acdbHostApplicationServices()->workingDatabase()
->getSymbolTable(pBlockTable, AcDb::kForRead);
AcDbBlockTableRecord *pBlockTableRecord;
pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord,
AcDb::kForWrite);
pBlockTable->close();
AcDbAlignedDimension *pDim1 = new AcDbAlignedDimension(Pt1, Pt2,Pt3,NULL,dimrecordid);
AcDbDiametricDimension *pDim3 = new AcDbDiametricDimension(Pt6, Pt7,leaderLength,dimText,dimrecordid);
pDim3->setLeaderLength(20);
AcDbObjectId Id;
pBlockTableRecord->appendAcDbEntity(Id, pDim1);
pBlockTableRecord->appendAcDbEntity(Id, pDim3);
pBlockTableRecord->close();
pDim1->close();
pDim3->close();
现在我希望标出的值是图形实际尺寸的一半，而不是尺寸的实际值，不知道对程序怎样操作。恳请高手不吝赐教，再次表示感谢，鲜花赠上
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