【求助】有关mapx画线的问题

<P>小弟画图程序如下</P>
<P>Private Sub DRAW(xx1 As Single, yy1 As Single, xx2 As Single, yy2 As Single)<BR>        Dim FeaFac As MapXLib.FeatureFactory<BR>        Dim Fea As New MapXLib.Feature<BR>        Dim Pts As New MapXLib.Points, pt As New MapXLib.Point<BR>        'Dim i As Integer<BR>        Fea.Attach Map1<BR>        Fea.Type = miFeatureTypeLine<BR>        Fea.Style = Map1.DefaultStyle<BR>        pt.Set xx1, yy1<BR>        Pts.add pt<BR>        pt.Set xx2, yy2<BR>        Pts.add pt<BR>        <BR>        Set Fea = Map1.FeatureFactory.CreateLine(Pts, Fea.Style)<BR>        Map1.Layers(1).AddFeature Fea 'Map1.Layers.Count<BR>        Map1.Refresh<BR>        Pts.RemoveAll<BR>End Sub</P>
<P> 为什么当x1y1 = 1,3     x2,y2 = 1000,1000 的时候，在地图里画出的直线坐标却是</P>
<P>Bound x1=0.001001 km  y1 =0.002999km   </P>
<P>Bound x2 = 0.012156km  y2 = 0.012159 km   呢？</P>
<P>其中有什么规律呢？我觉得我画的直线很乱 </P>