AcDbCurve::extend 延长指定多义线的前后长度
转载:http://blog.csdn.net/wanglihua312/article/details/7593392 int myExtendPolyline(AcDbPolyline* pl,double sOff,double eOff) { ASSERT(pl); if (pl->numVerts() < 2) { return 0; } if (sOff > 0) { AcGePoint3d sPt,sPt2; pl->getStartPoint(sPt); pl->getPointAt(1,sPt2); double td1,td2; pl->getDistAtPoint(sPt,td1); pl->getDistAtPoint(sPt2,td2); double off = td2 - td1; double sParam = fabs(sOff) / off; if(pl->extend(-sParam) != Acad::eOk) { ASSERT(0); return 0; } } if (eOff > 0) { AcGePoint3d ePt,ePt2; pl->getEndPoint(ePt); pl->getPointAt(pl->numVerts() - 2,ePt2); double td1,td2; pl->getDistAtPoint(ePt2,td1); pl->getDistAtPoint(ePt,td2); double off = td2 - td1; double eparam = fabs(eOff) / off; if(pl->extend(eparam) != Acad::eOk) { ASSERT(0); return 0; } } return 1; }查看完整版本： AcDbCurve::extend 延长指定多义线的前后长度
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