[求助]可以对Multipoit做缓冲区吗？大虾请进

<P>我用ITopologicalOperator接口对Multipoint作缓冲区，会报错。请教大虾那种接口方法可对Multipoint的几何类型作缓冲区。</P>
<P>再有，如果不行，请问怎样将esriGeometryMultipoint类型转为esriGeometryPoint类型？然后采用ITopologicalOperator接口对其作Buffer。</P>
<P>谢谢大虾指教！</P>

<P>Note : A negative distance can be specified to produce a buffer inside the original polygon. This cannot be used with polyline. ITopologicalOperator methods must be applied on high-level geometries only. <FONT color=#ee3d11>High-Level geometries are point, multipoint, polyline and polygon. </FONT>To use it with low-level geometries such as segments (Line, Circular Arc, Elliptic Arc, Bézier Curve), path or ring they must be wrapped into high-level geometries type.</P>
<P>-----------------<FONT color=#ee3d11>multipoint应该是可以的</FONT><BR></P>

<P>ITopologicalOperator2 pTop=mMultiPoint as ITopologicalOperator2;<BR>pTop.IsKnownSimple_2  =false;<BR>pTop.Simplify ();</P>
<P>---------------------我试过了一定要用ITopologicalOperator2做buffer，mMultiPoint就是一个自己定义的IMultipoint.</P>