图形学中编的线段裁剪的代码，对学习opengl和图形学比较好-Graphics compiled code segment to cut up, be good for learning opengl and graphics

使用gdal实现影像的矩形裁剪，可以根据需要确定起始位置以及确定要裁剪的大小。-Use gdal achieve rectangle cropped image, you can determine the starting position and to determine the size needed to be cropped.