添加制图图例（转）

AE二次开发-添加制图图例

 

添加图例方法代码：

        /// <summary>
        /// 添加图例
        /// </summary>
        /// <param name="layoutControl">布局视图</param>
        /// <param name="pEnv">矩形框</param>
        public static void AddLegend(AxPageLayoutControl layoutControl, IEnvelope pEnv)
        {
            IGraphicsContainer pGraphicsContainer = layoutControl.PageLayout as IGraphicsContainer;
            if (pGraphicsContainer == null) return;
            IMap pMap = layoutControl.ActiveView.FocusMap;
            IMapFrame pMapFrame = pGraphicsContainer.FindFrame(pMap) as IMapFrame;
            if (pMapFrame == null) return;
            UID pID = new UID();
            pID.Value = "esriCarto.Legend";
            IMapSurroundFrame pMapSurroundFrame = pMapFrame.CreateSurroundFrame(pID, null);//根据唯一标示符，创建与之对应MapSurroundFrame
            IElement pDeletElement = layoutControl.FindElementByName("Legend");//获取PageLayout中的图例元素
            if (pDeletElement != null)
            {
                pGraphicsContainer.DeleteElement(pDeletElement);  //如果已经存在图例，删除已经存在的图例
            }
            //获取图例背景
            pMapSurroundFrame.Background = GetSymbolBackground();
            //添加图例
            IElement pElement = pMapSurroundFrame as IElement;
            if (pElement == null) return;
            pElement.Geometry = pEnv;
            IMapSurround pMapSurround = pMapSurroundFrame.MapSurround;
            ILegend2 pLegend = pMapSurround as ILegend2;
            if (pLegend == null) return;
            //设置图例属性
            SetLegendProperty(pLegend, pMap);
            pGraphicsContainer.AddElement(pElement, 0);
        }

        /// <summary>
        /// 获取图例背景
        /// </summary>
        /// <returns></returns>
        private static ISymbolBackground GetSymbolBackground()
        {
            //设置MapSurroundFrame背景
            ISymbolBackground pSymbolBackground = new SymbolBackgroundClass();
            IFillSymbol pFillSymbol = new SimpleFillSymbolClass();
            ILineSymbol pLineSymbol = new SimpleLineSymbolClass();
            pLineSymbol.Color = AeFunction.GetRgbColor(0, 0, 0);
            pFillSymbol.Color = AeFunction.GetRgbColor(240, 240, 240);
            pFillSymbol.Outline = pLineSymbol;
            pSymbolBackground.FillSymbol = pFillSymbol;
            return pSymbolBackground;
        }

        /// <summary>
        /// 设置图例属性
        /// </summary>
        /// <param name="pLegend">图例</param>
        /// <param name="pMap">地图</param>
        private static void SetLegendProperty(ILegend2 pLegend, IMap pMap)
        {
            pLegend.ClearItems();
            pLegend.Title = "图例";
            pLegend.AutoVisibility = true;
            for (int i = 0; i < pMap.LayerCount; i++)
            {
                ILegendItem pLegendItem = new HorizontalLegendItemClass();
                pLegendItem.Layer = pMap.Layer[i];//获取添加图例关联图层             
                pLegendItem.ShowDescriptions = false;
                pLegendItem.Columns = 1;
                pLegendItem.ShowHeading = true;
                pLegendItem.ShowLabels = true;
                pLegend.AddItem(pLegendItem);//添加图例内容
            }
        }

在布局视图上绘制矩形框，添加图例到矩形框内。 
调用方法代码：

//在布局视图上绘制矩形框，添加图例到矩形框内
private void axPageLayoutControl1_OnMouseDown(object sender, IPageLayoutControlEvents_OnMouseDownEvent e)
        {
            if (e.button == 1) //左键点击
            {

                IGeometry pGeometry = axPageLayoutControl1.TrackRectangle();
                AddLegend(axPageLayoutControl1, (IEnvelope)pGeometry);
            }

        }