AE 栅格图分级渲染

ArcEngine对矢量数据进行风格化实在是得心应手，同样的对于栅格图像也能进行风格化！以前没接触过，今天正好需要，做出了栅格图像的渲染！下面实现的思路：

1.定义渲染的一系列接口

2.判断图像是否建立了直方图，如果没有则进行创建。

3.定义颜色序列，为渲染提供渲染的方案。

4.调用Render方法进行渲染。

下面是代码：有两个方法，一个是加载栅格数据，一个是进行渲染，接着在事件里面调用方法，实现图像渲染！

///

        /// 栅格分类专题图

        ///

        /// 栅格图层

        public static void funColorForRaster_Classify(IRasterLayer pRasterLayer)

        {

            IRasterClassifyColorRampRenderer pRClassRend = new RasterClassifyColorRampRenderer() as IRasterClassifyColorRampRenderer;

            IRasterRenderer pRRend = pRClassRend as IRasterRenderer;

            IRaster pRaster = pRasterLayer.Raster;

            IRasterBandCollection pRBandCol = pRaster as IRasterBandCollection;

            IRasterBand pRBand = pRBandCol.Item(0);

            if (pRBand.Histogram == null)

            {

                pRBand.ComputeStatsAndHist();

            }

            pRRend.Raster = pRaster;

            pRClassRend.ClassCount = 10;

            pRRend.Update();

            IRgbColor pFromColor = new RgbColor() as IRgbColor;

            pFromColor.Red = 255;

            pFromColor.Green = 0;

            pFromColor.Blue = 0;

            IRgbColor pToColor = new RgbColor() as IRgbColor;

            pToColor.Red = 0;

            pToColor.Green = 0;

            pToColor.Blue = 255;

            IAlgorithmicColorRamp colorRamp = new AlgorithmicColorRamp() as IAlgorithmicColorRamp;

            colorRamp.Size = 10;

            colorRamp.FromColor = pFromColor;

            colorRamp.ToColor = pToColor;          

            bool createColorRamp;

            colorRamp.CreateRamp(out createColorRamp);

            IFillSymbol fillSymbol = new SimpleFillSymbol() as IFillSymbol;

            for (int i = 0; i < pRClassRend.ClassCount; i++)

            {

                fillSymbol.Color = colorRamp.get_Color(i);

                pRClassRend.set_Symbol(i, fillSymbol as ISymbol);

                pRClassRend.set_Label(i, pRClassRend.get_Break(i).ToString("0.00"));

            }

            pRasterLayer.Renderer = pRRend;

        }

        ///

        /// 打开遥感图像

        ///

        /// 图像的地址

        /// IRasterLayer

        private IRasterLayer OpenImage(string imagePath)

        {

            string ws = Path.GetDirectoryName(imagePath);

            string fbs = Path.GetFileName(imagePath);

            IWorkspaceFactory pWork = new RasterWorkspaceFactory();

            IRasterWorkspace pRasterWs = pWork.OpenFromFile(ws,0) as IRasterWorkspace;

            IRasterDataset pRasterDataset = pRasterWs.OpenRasterDataset(fbs);

            IRasterLayer pRasterLayer = new RasterLayer() as IRasterLayer;

            pRasterLayer.CreateFromDataset(pRasterDataset);

            return pRasterLayer;            

        }

事件的逻辑:

axMapControl1.Map.AddLayer(OpenImage(filePath));

axMapControl1.ActiveView.Refresh();

funColorForRaster_Classify(axMapControl1.get_layer(0) as IRasterLayer);//only one RasterLayer

axMapControl1.Activeview.Refresh();

下面是渲染前后的效果图：

希望对大家有所帮助！