通过两点打断一条直线的ARX程序请帮忙！
<P>我想通过编程实现下述功能：</P><P>编程画了一条直线：</P>
<P>AcGePoint3d startPt,endPt;</P>
<P>AcDbBlockTable *pBlockTable;</P>
<P>acdbHostApplicationServices()->workingDatabase()->getSymbolTable(pBlockTable,AcDb::kForRead);</P>
<P>AcDbBlockTableRecord *pBlockRecord;</P>
<P>pBlockTable->getAt(ACDB_MODOAL_SPACE,pBlockRecord,AcDb::kForWrite);</P>
<P>pBlockTable->close();</P>
<P>startPt.set(100.0,100.0,0);</P>
<P>endPt.set(200.0,100.0,0);</P>
<P>AcDbLine *pLine;</P>
<P>pLine=new AcDbLine(startpt,endPt);</P>
<P>AcDbObjectId id;</P>
<P>pBlockRecord->appendAcDbEntity(id,pLine);</P>
<P>pLine->close();</P>
<P>上面直线画好了。现在我已知这条直线上的两点Pt1,Pt2：</P>
<P>AcGePoint3d Pt1(120.0,100.0,0),Pt2(160.0,100.0,0);</P>
<P>我请教如何通过编程在Pt1和Pt2点打断这条直线并删除Pt1和Pt2两点之间部分，保留其余部分。</P>
<P>这个功能用acedCommand()函数利用AutoCAD本身带的break命令能实现吗？如何实现？</P>
<P>请赐教一段程序，不胜感激！！</P>
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