C# 切分图片

        实际工作时用到的C# 切分图片的代码，可以将一张整图按行和列切分成固定大小的N张小图，索引从第1行开始0..n,再从第2行开始n+1...n+2n，请参考

         

 /// <summary>
        ///  按行、列分割原始图片
        /// </summary>
        /// <param name="rowNum">行数</param>
        /// <param name="colNum">列数</param>
        /// <param name="srcBitmap">原始图片</param>
        /// <returns>切割后的数组</returns>
        public static Bitmap[] getImageCut(int rowNum, int colNum, Bitmap srcBitmap)
        {
            int bitmapNum = rowNum * colNum;//图片数量
            Bitmap[] bitmapArr = new Bitmap[bitmapNum];
            int perWidth = srcBitmap.Width / colNum; //每个图片宽度
            int perHeight = srcBitmap.Height / rowNum;//每个图片高度
            int srcImageX = 0;
            int srcImageY = 0;
            for (int rowIdx = 0; rowIdx < rowNum; rowIdx++)
            {
                for (int colIdx = 0; colIdx < colNum; colIdx++)
                {
                    int curIdx = rowIdx * colNum + colIdx;
                    bitmapArr[curIdx] = new Bitmap(perWidth, perHeight);
                    Graphics newBmpGraphics = Graphics.FromImage(bitmapArr[curIdx]);//新图片
                    Rectangle destImageRect = new Rectangle(0, 0, perWidth, perHeight);//目标图片
                    Rectangle srcImageRect = new Rectangle(srcImageX, srcImageY, perWidth, perHeight);//原始图片
                    newBmpGraphics.DrawImage(srcBitmap, destImageRect, srcImageRect, GraphicsUnit.Pixel);
                    srcImageX += perWidth;
                }
                srcImageY += perHeight;
                srcImageX = 0;
            }
            return bitmapArr;
        }