[求助]AE中的圆弧问题

<P>IConstructCircularArc constructionArc = new CircularArc() as IConstructCircularArc;<BR>constructionArc.ConstructArcDistance(p, pFrom, true ,arclen);       </P>
<P>ICircularArc circularArc = constructionArc as ICircularArc;<BR>IGeometry shape = circularArc;</P>
<P>IFeature ipTempFeature = iFeatClass.CreateFeature();</P>
<P>ipTempFeature.Shape = shape;</P>
<P>当运行到 ipTempFeature.Shape = shape;时报错  "这个操作在一个空几何中试图进行."</P>

iFeatClass 是线图层

没有高手回答下么？在线图层里添加圆弧

ICircularArc转换ICurve看看<br>可能还要转换IPolyline<br>

<P>解决了</P>
<P>        IConstructCircularArc constructionArc = new CircularArc() as IConstructCircularArc;<BR>                                constructionArc.ConstructArcDistance(p, pFrom, true ,arclen);<BR>                                ICircularArc circularArc = constructionArc as ICircularArc;</P>
<P>                                ISegmentCollection pSegColl = new　PolylineClass ();<BR>                                object pBefore = Type.Missing;<BR>                                object pAfter = Type.Missing;<BR>                                pSegColl.AddSegment((ISegment)circularArc, ref   pBefore, ref   pAfter);</P>
<P>                                shape = (IGeometry)pSegColl;</P>