修改图层的symbol(AE+C#)

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取出一个图层的symbol 在其基础上对其进行修改

Code
        private void button1_Click(object sender, EventArgs e)
        {
  mp;nbsp;          
//设定要改变symbol的图层
            ILayer pLayer=m_mapControl.get_Layer(0);
            IGeoFeatureLayer pGeoFeatLayer 
= pLayer as IGeoFeatureLayer;

            
//得到此图层的symbol
            ISimpleMarkerSymbol pMarkerSymbol=new SimpleMarkerSymbolClass();
            pMarkerSymbol
=GetFeatureLayerSymbol(pLayer) as ISimpleMarkerSymbol;

            
//对symbol进行改变操作
            pMarkerSymbol.Size=20;    

            
//把改变后的symbol赋给此图层
            ISimpleRenderer pRenderer=new SimpleRendererClass();
            pRenderer.Symbol
=pMarkerSymbol as ISymbol;
            pGeoFeatLayer.Renderer 
= pRenderer as IFeatureRenderer;

          
        }

        
/// <summary> 得到指定图层的symbol</summary>
        
/// <param name="layer"></param>
        
/// <returns></returns>
        public ISymbol GetFeatureLayerSymbol(ILayer layer)
        {
            ISymbol pSymbol 
= null;

            IGeoFeatureLayer pGeoFeatLayer 
= (IGeoFeatureLayer)layer;
            IFeatureClass pFeatClass 
= pGeoFeatLayer.FeatureClass;
            IFeatureCursor pFeatCursor 
= pFeatClass.Search(nulltrue);
            IFeature pFeature 
= pFeatCursor.NextFeature();

            
if (pFeature == null)
            {
                pFeature 
= pFeatCursor.NextFeature();
            }
            
else
            {
                IFeatureRenderer pFeatRen;
                pFeatRen 
= pGeoFeatLayer.Renderer;
                pSymbol 
= pFeatRen.get_SymbolByFeature(pFeature);
            }
            
return pSymbol;
        }

 

posted @ 2009-05-10 19:37  因是因非  阅读(927)  评论(1编辑  收藏  举报