请教getTrimmedOffset函数的用法！

lhb.nj

void
请教：
getTrimmedOffset(

double distance,

AcGeVoidPointerArray& offsetCurveList,

AcGe::OffsetCrvExtType extensionType = AcGe::kFillet,

const AcGeTol& unnamed = AcGeContext::gTol) const;

的例子！