IRaster 转换为 Bitmap 方法二

IRaster 转换为 Bitmap 方法二

        /// <summary>
        /// 
        /// </summary>
        /// <param name="pRaster"></param>
        /// <returns></returns>
        public static Bitmap SaveBitmap(IRaster pRaster)
        {
            IRaster2 pRaster2 = pRaster as IRaster2;
            //获取图层的行列值   
            IRasterProps pRasterProps = pRaster as IRasterProps;
            int Height = pRasterProps.Height;
            int Width = pRasterProps.Width;

            //定义并初始化数组，用于存储栅格内所有像员像素值
            double[,] PixelValue_red = new double[Height, Width];
            double[,] PixelValue_green = new double[Height, Width];
            double[,] PixelValue_blue = new double[Height, Width];

            //定义RasterCursor初始化，参数设为null，内部自动设置PixelBlock大小
            IRasterCursor pRasterCursor = pRaster.CreateCursor();
            //获取该Cursor的PixelBlock中像素的值
            for (int i = 0; i < Height; i++)
            {
                //string str = "";
                for (int j = 0; j < Width; j++)
                {
                    PixelValue_red[i, j] = Convert.ToDouble(pRaster2.GetPixelValue(0, j, i));
                    PixelValue_green[i, j] = Convert.ToDouble(pRaster2.GetPixelValue(1, j, i));
                    PixelValue_blue[i, j] = Convert.ToDouble(pRaster2.GetPixelValue(2, j, i));
                }
            }

            Bitmap bitmap = new Bitmap(Width, Height);
            for (int w = 0; w < Width; w++)
            {
                for (int h = 0; h < Height; h++)
                {
                    Color color = Color.FromArgb((int)PixelValue_red[h, w], (int)PixelValue_green[h, w], (int)PixelValue_blue[h, w]);
                    bitmap.SetPixel(w, h, color);
                }
            }

            return bitmap;
        }