首页 > 代码库 > AE 栅格图分级渲染
AE 栅格图分级渲染
转自 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：
AE 栅格图分级渲染
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