AE 柵格圖分級渲染

ArcEngine對矢量數據進行風格化實在是得心應手，同樣的對於柵格圖像也能進行風格化！以前沒接觸過，今天正好需要，做出了柵格圖像的渲染！下面實現的思路：

1.定義渲染的一系列接口

2.判斷圖像是否建立了直方圖，如果沒有則進行創建。

3.定義顏色序列，為渲染提供渲染的方案。

4.調用Render方法進行渲染。

下面是代碼：有兩個方法，一個是加載柵格數據，一個是進行渲染，接着在事件里面調用方法，實現圖像渲染！

///

        /// 柵格分類專題圖

        ///

        /// 柵格圖層

        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;

        }

        

        ///

        /// 打開遙感圖像

        ///

        /// 圖像的地址

        /// 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;            

        }

事件的邏輯:

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圖：

希望對大家有所幫助！