using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Drawing.Imaging;

using System.Drawing;

using System.IO;

namespace TestUploadImage.FinalUse

{

    public class WatermarkMaker

    {

        /// <summary>

        /// 图片水印

        /// </summary>

        /// <param name="imgPath">服务器图片相对路径</param>

        /// <param name="filename">保存文件名</param>

        /// <param name="watermarkFilename">水印文件相对路径</param>

        /// <param name="watermarkStatus">图片水印位置 0=不使用 1=左上 2=中上 3=右上 4=左中  9=右下</param>

        /// <param name="quality">附加水印图片质量,0-100</param>

        /// <param name="watermarkTransparency">水印的透明度 1--10 10为不透明</param>

        public static void AddImageSignPic(string imgPath, string filename, string watermarkFilename, int watermarkStatus, int quality, int watermarkTransparency)

        {

            if (!File.Exists(GetMapPath(imgPath)))

                return;

            byte[] _ImageBytes = File.ReadAllBytes(GetMapPath(imgPath));

            Image img = Image.FromStream(new System.IO.MemoryStream(_ImageBytes));

            filename = GetMapPath(filename);

            if (watermarkFilename.StartsWith("/") == false)

                watermarkFilename = "/" + watermarkFilename;

            watermarkFilename = GetMapPath(watermarkFilename);

            if (!File.Exists(watermarkFilename))

                return;

            Graphics g = Graphics.FromImage(img);

            //设置高质量插值法

            //g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

            //设置高质量,低速度呈现平滑程度

            //g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            Image watermark = new Bitmap(watermarkFilename);

            if (watermark.Height >= img.Height || watermark.Width >= img.Width)

                return;

            ImageAttributes imageAttributes = new ImageAttributes();

            ColorMap colorMap = new ColorMap();

            colorMap.OldColor = Color.FromArgb(, , , );

            colorMap.NewColor = Color.FromArgb(, , , );

            ColorMap[] remapTable = { colorMap };

            imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);

            float transparency = 0.5F;

            if (watermarkTransparency >=  && watermarkTransparency <= )

                transparency = (watermarkTransparency / 10.0F);

            float[][] colorMatrixElements = {

                                                new float[] {1.0f,  0.0f,  0.0f,  0.0f, 0.0f},

                                                new float[] {0.0f,  1.0f,  0.0f,  0.0f, 0.0f},

                                                new float[] {0.0f,  0.0f,  1.0f,  0.0f, 0.0f},

                                                new float[] {0.0f,  0.0f,  0.0f,  transparency, 0.0f},

                                                new float[] {0.0f,  0.0f,  0.0f,  0.0f, 1.0f}

                                            };

            ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements);

            imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);

            int xpos = ;

            int ypos = ;

            switch (watermarkStatus)

            {//0 = 不使用 1 = 左上 2 = 中上 3 = 右上 4 = 左中  9 = 右下

                case :

                    xpos = (int)(img.Width * (float).);

                    ypos = (int)(img.Height * (float).);

                    break;

                case :

                    xpos = (int)((img.Width * (float).) - (watermark.Width / ));

                    ypos = (int)(img.Height * (float).);

                    break;

                case :

                    xpos = (int)((img.Width * (float).) - (watermark.Width));

                    ypos = (int)(img.Height * (float).);

                    break;

                case :

                    xpos = (int)(img.Width * (float).);

                    ypos = (int)((img.Height * (float).) - (watermark.Height / ));

                    break;

                case :

                    xpos = (int)((img.Width * (float).) - (watermark.Width / ));

                    ypos = (int)((img.Height * (float).) - (watermark.Height / ));

                    break;

                case :

                    xpos = (int)((img.Width * (float).) - (watermark.Width));

                    ypos = (int)((img.Height * (float).) - (watermark.Height / ));

                    break;

                case :

                    xpos = (int)(img.Width * (float).);

                    ypos = (int)((img.Height * (float).) - watermark.Height);

                    break;

                case :

                    xpos = (int)((img.Width * (float).) - (watermark.Width / ));

                    ypos = (int)((img.Height * (float).) - watermark.Height);

                    break;

                case :

                    xpos = (int)((img.Width * (float).) - (watermark.Width));

                    ypos = (int)((img.Height * (float).) - watermark.Height);

                    break;

            }

            g.DrawImage(watermark, new Rectangle(xpos, ypos, watermark.Width, watermark.Height), , , watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes);

            ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();

            ImageCodecInfo ici = null;

            foreach (ImageCodecInfo codec in codecs)

            {

                if (codec.MimeType.IndexOf("jpeg") > -)

                    ici = codec;

            }

            EncoderParameters encoderParams = new EncoderParameters();

            long[] qualityParam = new long[];

            if (quality <  || quality > )

                quality = ;

            qualityParam[] = quality;

            EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityParam);

            encoderParams.Param[] = encoderParam;

            if (ici != null)

                img.Save(filename, ici, encoderParams);

            else

                img.Save(filename);

            g.Dispose();

            img.Dispose();

            watermark.Dispose();

            imageAttributes.Dispose();

        }

        /// <summary>

        /// 文字水印

        /// </summary>

        /// <param name="imgPath">服务器图片相对路径</param>

        /// <param name="filename">保存文件名</param>

        /// <param name="watermarkText">水印文字</param>

        /// <param name="watermarkStatus">图片水印位置 0=不使用 1=左上 2=中上 3=右上 4=左中  9=右下</param>

        /// <param name="quality">附加水印图片质量,0-100</param>

        /// <param name="fontname">字体</param>

        /// <param name="fontsize">字体大小</param>

        public static void AddImageSignText(string imgPath, string filename, string watermarkText, int watermarkStatus, int quality, string fontname, int fontsize)

        {

            byte[] _ImageBytes = File.ReadAllBytes(GetMapPath(imgPath));

            Image img = Image.FromStream(new System.IO.MemoryStream(_ImageBytes));

            filename = GetMapPath(filename);

            Graphics g = Graphics.FromImage(img);

            Font drawFont = new Font(fontname, fontsize, FontStyle.Regular, GraphicsUnit.Pixel);

            SizeF crSize;

            crSize = g.MeasureString(watermarkText, drawFont);

            float xpos = ;

            float ypos = ;

            switch (watermarkStatus)

            {

                case :

                    xpos = (float)img.Width * (float).;

                    ypos = (float)img.Height * (float).;

                    break;

                case :

                    xpos = ((float)img.Width * (float).) - (crSize.Width / );

                    ypos = (float)img.Height * (float).;

                    break;

                case :

                    xpos = ((float)img.Width * (float).) - crSize.Width;

                    ypos = (float)img.Height * (float).;

                    break;

                case :

                    xpos = (float)img.Width * (float).;

                    ypos = ((float)img.Height * (float).) - (crSize.Height / );

                    break;

                case :

                    xpos = ((float)img.Width * (float).) - (crSize.Width / );

                    ypos = ((float)img.Height * (float).) - (crSize.Height / );

                    break;

                case :

                    xpos = ((float)img.Width * (float).) - crSize.Width;

                    ypos = ((float)img.Height * (float).) - (crSize.Height / );

                    break;

                case :

                    xpos = (float)img.Width * (float).;

                    ypos = ((float)img.Height * (float).) - crSize.Height;

                    break;

                case :

                    xpos = ((float)img.Width * (float).) - (crSize.Width / );

                    ypos = ((float)img.Height * (float).) - crSize.Height;

                    break;

                case :

                    xpos = ((float)img.Width * (float).) - crSize.Width;

                    ypos = ((float)img.Height * (float).) - crSize.Height;

                    break;

            }

            g.DrawString(watermarkText, drawFont, new SolidBrush(Color.White), xpos + , ypos + );

            g.DrawString(watermarkText, drawFont, new SolidBrush(Color.Black), xpos, ypos);

            ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();

            ImageCodecInfo ici = null;

            foreach (ImageCodecInfo codec in codecs)

            {

                if (codec.MimeType.IndexOf("jpeg") > -)

                    ici = codec;

            }

            EncoderParameters encoderParams = new EncoderParameters();

            long[] qualityParam = new long[];

            if (quality <  || quality > )

                quality = ;

            qualityParam[] = quality;

            EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityParam);

            encoderParams.Param[] = encoderParam;

            if (ici != null)

                img.Save(filename, ici, encoderParams);

            else

                img.Save(filename);

            g.Dispose();

            img.Dispose();

        }

        #region 获得当前绝对路径

        /// <summary>

        /// 获得当前绝对路径

        /// </summary>

        /// <param name="strPath">指定的路径</param>

        /// <returns>绝对路径</returns>

        public static string GetMapPath(string strPath)

        {

            if (strPath.ToLower().StartsWith("http://"))

            {

                return strPath;

            }

            if (HttpContext.Current != null)

            {

                string path = System.Web.HttpContext.Current.Server.MapPath("/") + strPath;

                return path;

            }

            else //非web程序引用

            {

                strPath = strPath.Replace("/", "\\");

                if (strPath.StartsWith("\\"))

                {

                    strPath = strPath.Substring(strPath.IndexOf('\\', )).TrimStart('\\');

                }

                return System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, strPath);

            }

        }

        #endregion

    }

}