AE IRasterCursor 改变栅格图层像素值
刚刚说的是获取像素值。如果要进一步改变像素值的话，需要用到IRasterEdit接口的Write方法。Write方法的参数有两个，一个是在栅格图像中的左上角位置（行列值不是坐标值），另一个就是获取像素值时提到的PixelBlock. 执行完Write方法后要对实现IRasterEdit接口的对象进行释放。
1 public void ChangePixelValue(double xMax, double xMin, double yMax, double yMin,double[,] PixelChanged) 2 { 3 IRaster pRaster = thisRasterLayer.Raster; 4 IRaster2 pRaster2 = pRaster as IRaster2; 5 6 //地图坐标转换为图中行列值 7 rowMax = pRaster2.ToPixelRow(yMin); 8 rowMin = pRaster2.ToPixelRow(yMax); 9 columnMin = pRaster2.ToPixelColumn(xMin); 10 columnMax = pRaster2.ToPixelColumn(xMax); 11 12 int Height = rowMax - rowMin + 1; 13 int Width = columnMax - columnMin + 1; 14 15 //按照需要的大小建立一个空的PixelBlock3 16 IPnt blocksize = new PntClass(); 17 blocksize.SetCoords(Width, Height); 18 19 IPixelBlock3 pPixelBlock3 = pRaster.CreatePixelBlock(blocksize) as IPixelBlock3; 20 21 System.Array pixels = (System.Array)pPixelBlock3.get_PixelData(0); 22 23 //为新建的PixelBlock赋值 24 try 25 { 26 for (int i = 0; i < Height; i++) 27 { 28 for (int j = 0; j < Width; j++) 29 { 30 pixels.SetValue(Convert.ToByte(PixelChanged[i,j]), j, i); 31 } 32 } 33 } 34 catch (Exception ex) 35 { 36 MessageBox.Show(ex.Message); 37 } 38 39 //把像素值赋予新建的PixelBlock3 40 pPixelBlock3.set_PixelData(0, pixels); 41 42 //PixelBlock3应在的位置 43 blocksize.SetCoords(columnMin, rowMin); 44 45 //改变的像素值写入图层 46 IRasterEdit pRasterEdit = pRaster as IRasterEdit; 47 pRasterEdit.Write(blocksize, (IPixelBlock)pPixelBlock3); 48 pRasterEdit.Refresh(); 49 50 System.Runtime.InteropServices.Marshal.ReleaseComObject(pRasterEdit); 51 }
修改过的图层需要保存，不然重新加载时像素值还是没有修改过。
1 //要保存的图层； 2 IRasterLayer pRasterLayer = axMapControl1.get_Layer(0) as IRasterLayer; 3 IRaster pRaster = pRasterLayer.Raster; 4 IRaster2 pRaster2 = pRaster as IRaster2; 5 6 ISaveAs pSaveAs = pRaster2 as ISaveAs; 7 pSaveAs.SaveAs(@"F:\Work\DEM高程矩阵\DEM高程矩阵\bin\Debug\渲染图层2.tif", null, "TIFF");
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