实现图像剪裁 jquery.Jcrop



  配合 jquery.Jcrop 实现上传图片进行剪裁保存功能

  

    <script src="js/jquery.min.js"></script>
    <script src="js/jquery.Jcrop.js"></script>
    <link rel="stylesheet" href="css/jquery.Jcrop.css" type="text/css" />
    <script type="text/javascript">
        jQuery(function ($) {
            //target是<img>的id
            jQuery('#target').Jcrop({
                onChange: showCoords,
                onSelect: showCoords
            });
        });

        function showCoords(c) {
            jQuery('#x').val(c.x); //x起点坐标
            jQuery('#y').val(c.y);
            jQuery('#x2').val(c.x2);//x终点坐标
            jQuery('#y2').val(c.y2);
            jQuery('#w').val(c.w);
            jQuery('#h').val(c.h);
        };
    </script>

后台代码

        /// <summary>
        /// 剪裁图像
        /// </summary>
        /// <param name="Img">原图物理地址</param>
        /// <param name="Width">新图宽度</param>
        /// <param name="Height">新图高度</param>
        /// <param name="X">绘制起点X轴</param>
        /// <param name="Y">绘制起点Y轴</param>
        /// <returns></returns>
        private byte[] Crop(string Img, int Width, int Height, int X, int Y)
        {
            try
            {
                using (var OriginalImage = new Bitmap(Img))
                {
                    using (var bmp = new Bitmap(Width, Height, OriginalImage.PixelFormat))
                    {
                        bmp.SetResolution(OriginalImage.HorizontalResolution, OriginalImage.VerticalResolution);
                        using (Graphics Graphic = Graphics.FromImage(bmp))
                        {
                            Graphic.SmoothingMode = SmoothingMode.AntiAlias;//设置高质量，低速度呈现平滑程度
                            Graphic.InterpolationMode = InterpolationMode.HighQualityBicubic;//设置高质量插值法
                            Graphic.Clear(Color.Transparent);//清空画布并以透明背景色填充
                            Graphic.PixelOffsetMode = PixelOffsetMode.HighQuality;
                            Graphic.DrawImage(OriginalImage, new Rectangle(0, 0, Width, Height), X, Y, Width, Height,
                                              GraphicsUnit.Pixel);
                          方法一
                            bmp.Save(Server.MapPath("上传裁剪") + "new.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);//图片另存
                          方法二  //转换二进制流
                            var ms = new MemoryStream();
                            bmp.Save(ms, OriginalImage.RawFormat);

                            return ms.GetBuffer();
                        }
                    }
                }
            }
            catch (Exception Ex)
            {
                throw (Ex);
            }
        }