图片的切割.doc

public void Crop(int left, int top, int right, int bottom)
        {
            int num;
            int num2;
            if (( - left) < right)
            {
                num =  - right;
            }
            else
            {
                num = right;
            }
            if (( - top) < bottom)
            {
                num2 =  - top;
            }
            else
            {
                num2 = bottom;
            }
            using (Bitmap image = new Bitmap(num, num2))
            {
                (, );
                using (Graphics graphics = (image))
                {
                    ();
                     = ;
                    (, new Rectangle(0, 0, num, num2), new Rectangle(left, top, num, num2), );
                    oCurrentImage = (Bitmap)();
                }
            }
        }
private Bitmap bt1;
        private Bitmap bt2;
        Point p1;
        Point p2;
        bool b = false;
        Image img;
/// <summary>
        /// 剪切图片的