如何获得arcmap的当前比例？？

 如何获得arcmap的当前比例？？<img src="images/post/smile/dvbbs/em02.gif" /><img src="images/post/smile/dvbbs/em02.gif" /><img src="images/post/smile/dvbbs/em02.gif" /><img src="images/post/smile/dvbbs/em01.gif" />

是地图比例吗？好象只有放大比例

<H1>MapScale Property (<a href="mk:@MSITStore:C:\Program%20Files\ArcGIS\DeveloperKit\Help\COM\VB\esriCarto.chm::/Carto_library.htm" target="_blank" >esriCarto</A>)</H1>
<P>The scale of the map as a representative fraction.
<P><IMG src="mk:@MSITStore:C:\Program%20Files\ArcGIS\DeveloperKit\Help\COM\VB\esriCarto.chm::/bitmaps/ReadWrite.gif"> Read/write.</P>
<P>
<P><B>Syntax</B></P>
<P><I>object</I>.<B>MapScale</B> = [<I> value </I>]</P>
<TABLE cellSpacing=4 cols=2 cellPadding=4>

<TR vAlign=top>
<TH width="15%">Part</TH>
<TH width="85%">Description</TH></TR>
<TR vAlign=top>
<TD class=t width="15%"><I>object</I></TD>
<TD class=t width="85%">An <A>object expression</A> that evaluates to an object in the Applies To list.</TD></TR>
<TR vAlign=top>
<TD class=t width="15%"><I>value</I></TD>
<TD class=t width="85%">A <A>Double</A> that determines the MapScale.</TD></TR></TD></TR></TABLE>
<P><B>Return Value</B></P>
<P>Double</P>
<P><B>Product Availability</B></P>
<DIV>Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.</DIV>
<P><B>Remarks</B></P>
<DIV>Scale is the relationship between the dimensions of features on a map and the geographic objects they represent on the earth, commonly expressed as a fraction or a ratio.  A map scale of 1/100,000 or 1:100,000 means that one unit of measure on the map equals 100,000 of the same units on the earth.</DIV>
<DIV>The <B>MapScale</B> property is really a shortcut to <A><B>IDisplayTransformation::ScaleRatio</B></A>.</DIV>