AE栅格分类渲染问题解决

Posted 2020-10-01 GIS MAN

一个0-255的波段图像,要分为三类,0-85,85-170,170-255,那么这个断点其实有四个,分别是0,85,170,255

当按照下面方式写代码时，真正的分类break并没有设置成功。注意黑体部分；

　

        public static void ClassifyRenderRaster(IRasterLayer pRasterLayer, int ClassifyNum)
        {
            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;//this
            pRClassRend.ClassCount = ClassifyNum;
            pRRend.Update();//this
            //省略colorRamp的生成代码


            int[] breaks = { 0, 25, 50, 75, 100, 200 };
            IFillSymbol fillSymbol = new SimpleFillSymbol() as IFillSymbol;
            for (int i = 0; i < pRClassRend.ClassCount; i++)
            {
                //fillSymbol.Color = colorRamp.get_Color(i);
                fillSymbol.Color = GetColor(i);
                pRClassRend.set_Symbol(i, fillSymbol as ISymbol);
                pRClassRend.set_Break(i, breaks[i]);//this
               //pRClassRend.set_Label(i, pRClassRend.get_Break(i).ToString("0.00"));
             } 
               pRasterLayer.Renderer = pRRend //this
             }

 

改动后成功。IRasterRenderer.Update须在设置break之后，并且IRasterLayer须赋值为IRasterClassifyColorRampRenderer。

　

        public static void ClassifyRenderRaster(IRasterLayer pRasterLayer, int ClassifyNum)
        {
            IRasterClassifyColorRampRenderer pRClassRend = new RasterClassifyColorRampRenderer() as IRasterClassifyColorRampRenderer;
            IRaster pRaster = pRasterLayer.Raster;

            IRasterBandCollection pRBandCol = pRaster as IRasterBandCollection;
            IRasterBand pRBand = pRBandCol.Item(0);
            if (pRBand.Histogram == null)
            {
                pRBand.ComputeStatsAndHist();
            }

            pRClassRend.ClassCount = ClassifyNum;

            int[] breaks = { 0, 25, 50, 75, 100, 200 };
            IFillSymbol fillSymbol = new SimpleFillSymbol() as IFillSymbol;
            for (int i = 0; i < pRClassRend.ClassCount; i++)
            {
                fillSymbol.Color = colorRamp.get_Color(i);
                fillSymbol.Color = GetColor(i);
                pRClassRend.set_Symbol(i, fillSymbol as ISymbol);
                pRClassRend.set_Break(i, breaks[i]);
                //pRClassRend.set_Label(i, pRClassRend.get_Break(i).ToString("0.00"));
            }

            //IRasterRenderer pRRend = pRClassRend as IRasterRenderer;
            //pRRend.Update(); 这两句可以省略
            pRasterLayer.Renderer = pRClassRend as IRasterRenderer; //this
        }

 

　　

开始主要参照这几个，没有解决

AE 栅格图分级渲染 ： 参照这里不重新设置break的话（就是不是自定义分类），只设置每个分级的颜色之类的，是可以的，

arcengine栅格渲染（栅格重分类） IRasterClassifyColorRampRenderer ：未测试

IRasterClassifyColorRampRenderer 使用时的一些奇怪的地方： 这个顺序不行吧？