大学IT网 - 最懂大学生的IT学习网站! QQ资料交流群:367606806
当前位置:大学IT网 > C#技巧 > C#图片裁剪经典代码

C#图片裁剪经典代码

关键词:C#图片裁剪  阅读(697) 赞(18)

[摘要]本文是对C# 图片裁剪代码的讲解,对学习C#编程技术有所帮助,与大家分享。
        /// <summary>
        /// 缩小裁剪图片
        /// </summary>
        /// <param name="int_Width">要缩小裁剪图片宽度</param>
        /// <param name="int_Height">要缩小裁剪图片长度</param>
        /// <param name="input_ImgUrl">要处理图片路径</param>
        /// <param name="out_ImgUrl">处理完毕图片路径</param>
        public void ImgReduceCutOut(int int_Width, int int_Height, string input_ImgUrl, string out_ImgUrl)
        {
            // ===上传标准图大小===
            int int_Standard_Width = 160;
            int int_Standard_Height = 160;

            int Reduce_Width = 0; // 缩小的宽度
            int Reduce_Height = 0; // 缩小的高度
            int CutOut_Width = 0; // 裁剪的宽度
            int CutOut_Height = 0; // 裁剪的高度
            int level = 100; //缩略图的质量 1-100的范围

            // ===获得缩小,裁剪大小===
            if (int_Standard_Height * int_Width / int_Standard_Width > int_Height)
            {
                Reduce_Width = int_Width;
                Reduce_Height = int_Standard_Height * int_Width / int_Standard_Width;
                CutOut_Width = int_Width;
                CutOut_Height = int_Height;
            }
            else if (int_Standard_Height * int_Width / int_Standard_Width < int_Height)
            {
                Reduce_Width = int_Standard_Width * int_Height / int_Standard_Height;
                Reduce_Height = int_Height;
                CutOut_Width = int_Width;
                CutOut_Height = int_Height;
            }
            else
            {
                Reduce_Width = int_Width;
                Reduce_Height = int_Height;
                CutOut_Width = int_Width;
                CutOut_Height = int_Height;
            }

            // ===通过连接创建Image对象===
            System.Drawing.Image oldimage = System.Drawing.Image.FromFile(Server.MapPath(input_ImgUrl));

            // ===缩小图片===
            System.Drawing.Image thumbnailImage = oldimage.GetThumbnailImage(Reduce_Width, Reduce_Height, new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback), IntPtr.Zero);
            Bitmap bm = new Bitmap(thumbnailImage);

            // ===处理JPG质量的函数===
            ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
            ImageCodecInfo ici = null;
            foreach (ImageCodecInfo codec in codecs)
            {
                if (codec.MimeType == "image/jpeg")
                    ici = codec;
            }
            EncoderParameters ep = new EncoderParameters();
            ep.Param[0] = new EncoderParameter(Encoder.Quality, (long)level);

            //bm.Save(Server.MapPath("2.jpg"), ici, ep);

            // ===裁剪图片===
            Rectangle cloneRect = new Rectangle(0, 0, CutOut_Width, CutOut_Height);
            PixelFormat format = bm.PixelFormat;
            Bitmap cloneBitmap = bm.Clone(cloneRect, format);

            // ===保存图片===
            cloneBitmap.Save(Server.MapPath(out_ImgUrl), ici, ep);
        }


相关评论