C#图片操作的问题，求教、

Question

有一张图片是1.jpg. widht:100  height:200
现在我想得到这张图片的x坐标10 ,y坐标40的位置，长为40，宽为70的图片区域，并在<img src='1.jpg' ></img>上显示出截取后的图片 ，请问如何实现

Answer 1

http://topic.csdn.net/t/20050413/11/3932437.html

Answer 2

///   <summary>  
        ///   从图片中截取部分生成新图  
        ///   </summary>  
        ///   <param   name="sFromFilePath">原始图片</param>  
        ///   <param   name="saveFilePath">生成新图</param>  
        ///   <param   name="width">截取图片宽度</param>  
        ///   <param   name="height">截取图片高度</param>  
        ///   <param   name="spaceX">截图图片X坐标</param>  
        ///   <param   name="spaceY">截取图片Y坐标</param>  
        public static void CaptureImage(string sFromFilePath, string saveFilePath, int width, int height, int spaceX, int spaceY)
        {
            //载入底图  
            Image fromImage = Image.FromFile(sFromFilePath);
            int x = 0;   //截取X坐标  
            int y = 0;   //截取Y坐标  
            //原图宽与生成图片宽   之差      
            //当小于0(即原图宽小于要生成的图)时，新图宽度为较小者   即原图宽度   X坐标则为0    
            //当大于0(即原图宽大于要生成的图)时，新图宽度为设置值   即width         X坐标则为   sX与spaceX之间较小者  
            //Y方向同理  
            int sX = fromImage.Width - width;
            int sY = fromImage.Height - height;
            if (sX > 0)
            {
                x = sX > spaceX ? spaceX : sX;
            }
            else
            {
                width = fromImage.Width;
            }
            if (sY > 0)
            {
                y = sY > spaceY ? spaceY : sY;
            }
            else
            {
                height = fromImage.Height;
            }            //创建新图位图  
            Bitmap bitmap = new Bitmap(width, height);
            //创建作图区域  
            Graphics graphic = Graphics.FromImage(bitmap);
            //截取原图相应区域写入作图区  
            graphic.DrawImage(fromImage, 0, 0, new Rectangle(x, y, width, height), GraphicsUnit.Pixel);
            //从作图区生成新图  
            Image saveImage = Image.FromHbitmap(bitmap.GetHbitmap());
            //保存图象  
            saveImage.Save(saveFilePath, System.Drawing.Imaging.ImageFormat.Jpeg);
            //释放资源  
            saveImage.Dispose();
            bitmap.Dispose();
            graphic.Dispose();
        }
重绘

Answer 3

    protected void Page_Load(object sender, EventArgs e)
    {
        string path = Server.MapPath("images/p002.jpg");
        DrawImage(path, 10, 40, 40, 70);
    }
    public void DrawImage(string path, int x, int y, int width, int height)
    {
        string savepath = "images/thu_p002.jpg";
        System.Drawing.Image image = System.Drawing.Image.FromFile(path);
        Bitmap bitmap = new Bitmap(width, height);
        if (image.Width - width > 0)
            x = x > (image.Width - width) ? image.Width - width : x;
        else
            width = image.Width;
        if (image.Height - height > 0)
            y = y > (image.Height - height) ? image.Height - height : y;
        else
            height = image.Height;
        Graphics g = Graphics.FromImage(bitmap);
        g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
        g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
        g.DrawImage(image, new Rectangle(0, 0, width, height), x, y, width, height, GraphicsUnit.Pixel);
        bitmap.Save(Server.MapPath(savepath));
        bitmap.Dispose();
        image.Dispose();
        g.Dispose();
        Image1.ImageUrl = savepath;
    }