实际项目中在用关于图象处理的封装，能实现屏幕截图、获取缩略图并自动计算宽度，按比例缩小图片，剪裁图片，通过图片生成缩略图(非常实用，且有非常详细的注释)-Actual project in the use of image processing in packaging, can realize the screenshot, obtain the thumbnail and automatically calculated width, scale images, image clipping, through generated thumbnail pictures (very practical and has a very detailed comments)