C sharp 制作图案水印.doc

C#制作图案水印using System;using System.Collections.Generic;using System.Text;using System.IO;using System.Drawing;using System.Drawing.Imaging;using System.Drawing.Drawing2D;namespace cj.Tools/*/ 图像操作类(主要用于给图片加上透明文字水印)/public class ImageWater_Word#region 添加水印/ / 添加水印/ / / / / / / / public byte DrawImage(byte picBt, string waterWords, float alpha, PointF posf, bool fRewrite, Color color)Image imgPho = null;Bitmap bmPho = null;Graphics grPho = null;MemoryStream meoStr = new MemoryStream(picBt, 0, picBt.Length);imgPho = Image.FromStream(meoStr);int phWidth = imgPho.Width;int phHeight = imgPho.Height;bmPho = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);bmPho.SetResolution(imgPho.HorizontalResolution, imgPho.VerticalResolution);grPho = Graphics.FromImage(bmPho);grPho.SmoothingMode = SmoothingMode.AntiAlias;grPho.DrawImage(imgPho, new Rectangle(0, 0, phWidth, phHeight), 0, 0, phWidth, phHeight, GraphicsUnit.Pixel);Font crFont = null;SizeF crSize = new SizeF();crFont = new Font(arial, 9, FontStyle.Bold);crSize = grPho.MeasureString(waterWords, crFont);int yPixlesFromBottom = (int)(phHeight * .05);/定义在图片上文字的位置float wmHeight = crSize.Height;float wmWidth = crSize.Width;float xPosOfWm = posf.X * 3;float yPosOfWm = posf.Y * 2;StringFormat StrFormat = new StringFormat(); /定义需要印的文字居中对齐StrFormat.Alignment = StringAlignment.Center;int m_alpha = Convert.ToInt32(256 * alpha);SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(m_alpha, 0, 0, 0);grPho.DrawString(waterWords, /string of textcrFont, /fontsemiTransBrush2, /Brushnew PointF(xPosOfWm + 1, yPosOfWm + 1), /PositionStrFormat);SolidBrush semiTransBrush = new SolidBrush(color);grPho.DrawString(waterWords, /string of textcrFont, /fontsemiTransBrush, /Brushnew PointF(xPosOfWm, yPosOfWm), /PositionStrFormat);imgPho = bmPho;/imgPho.Save(d:a.jpg);return SetImageToByte(imgPho);#endregionprivate string _ErrMsg;#region 出错信息/*/出错信息/public string ErrMsgget return _ErrMsg; set _ErrMsg = value; #endregion#region 将文件转换成流/ 将文件转换成流/文件全路径/private byte SetImageToByteArray(string fileName)byte image = null;tryFileStream fs = new FileStream(fileName, FileMode.Open);FileInfo fileInfo = new FileInfo(fileName);int streamLength = (int)fs.Length;image = new bytestreamLength;fs.Read(image, 0, streamLength);fs.Close();return image;catchreturn image;#endregion#region 将byte转换成MemoryStream类型/*/ASP.NET图片加水印：将byte转换成MemoryStream类型/byte变量/private MemoryStream ByteToStream(byte mybyte)MemoryStream mymemorystream = new MemoryStream(mybyte, 0, mybyte.Length);return mymemorystream;#endregion#region 将byte转换成Image文件/*/ASP.NET图片加水印：将byte转换成Image文件/byte变量/private System.Drawing.Image SetByteToImage(byte mybyte)System.Drawing.Image image;MemoryStream mymemorystream = new MemoryStream(mybyte, 0, mybyte.Length);image = System.Drawing.Image.FromStream(mymemorystream);return image;#endregion#region 批量在图片上添加透明水印文字/ / ASP.NET图片加水印：批量在图片上添加透明水印文字/ / 原来图片地址(路径+文件名)/ 需要添加到图片上的文字/ 透明度(0.11.0之间)/ 文字显示的位置/ 是否覆盖原图片(如果不覆盖，那么将在同目录下生成一个文件名带0607的文件)/ 生成水印的颜色/ 生成生水印的文件名(名字为原文件+_+自定义名)/ public bool DrawWords(string arrsourcePicture, string waterWords, float alpha, PointF position, bool fRewrite, Color color, string filename)foreach (string imgPath in arrsourcePicture)if (!DrawWords(imgPath, waterWords, alpha, position, fRewrite, color, filename)_ErrMsg += 处理文件： + imgPath + 时出错。;return false;return true;#endregion#region 在图片上添加透明水印文字/ / ASP.NET图片加水印：在图片上添加透明水印文字/ / 原来图片地址(路径+文件名)/ 需要添加到图片上的文字/ 透明度(0.11.0之间)/ 文字显示的位置/ 是否覆盖原图片(如果不覆盖，那么将在同目录下生成一个文件名带0607的文件)/ 生成水印的颜色/ 生成生水印的文件名(名字为原文件+_+自定义名)/ public bool DrawWords(string sourcePicture, string waterWords, float alpha, PointF position, bool fRewrite, Color color, string filename)if (!System.IO.File.Exists(sourcePicture)_ErrMsg = 文件不存在！;return false;string fileExtension = System.IO.Path.GetExtension(sourcePicture).ToLower();if (fileExtension != .gif & fileExtension != .jpg & fileExtension != .png & fileExtension != .bmp)_ErrMsg = 不是图片文件！;return false;Image imgPhoto = null;Bitmap bmPhoto = null;Graphics grPhoto = null;try/创建一个图片对象用来装载要被添加水印的图片imgPhoto = Image.FromStream(ByteToStream(SetImageToByteArray(sourcePicture);/获取图片的宽和高int phWidth = imgPhoto.Width;int phHeight = imgPhoto.Height;/建立一个bitmap，和我们需要加水印的图片一样大小bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);/SetResolution：设置此 Bitmap 的分辨率/这里直接将我们需要添加水印的图片的分辨率赋给了bitmapbmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);/Graphics：封装一个 GDI+ 绘图图面。grPhoto = Graphics.FromImage(bmPhoto);/设置图形的品质grPhoto.SmoothingMode = SmoothingMode.AntiAlias;/将我们要添加水印的图片按照原始大小描绘（复制）到图形中grPhoto.DrawImage(imgPhoto,/ 要添加水印的图片new Rectangle(0, 0, phWidth, phHeight), / 根据要添加的水印图片的宽和高0, / X方向从0点开始描绘0, / Y方向phWidth, / X方向描绘长度phHeight, / Y方向描绘长度GraphicsUnit.Pixel); / 描绘的单位，这里用的是像素/根据图片的大小我们来确定添加上去的文字的大小/在这里我们定义一个数组来确定int sizes = new int 48, 36, 28, 24, 16, 14, 12, 10 ;/字体Font crFont = null;/矩形的宽度和高度，SizeF有三个属性，分别为Height高，width宽，IsEmpty是否为空SizeF crSize = new SizeF();/利用一个循环语句来选择我们要添加文字的型号/直到它的长度比图片的宽度小for (int i = 0; i sizes.Length; i+)crFont = new Font(arial, sizesi, FontStyle.Bold);/测量用指定的 Font 对象绘制并用指定的 StringFormat 对象格式化的指定字符串。crSize = grPhoto.MeasureString(waterWords, crFont);/ ushort 关键字表示一种整数数据类型if (ushort)crSize.Width (ushort)phWidth)break; /截边5%的距离，定义文字显示(由于不同的图片显示的高和宽不同，所以按百分比截取)int yPixlesFromBottom = (int)(phHeight * .05);/定义在图片上文字的位置float wmHeight = crSize.Height;float wmWidth = crSize.Width;float xPosOfWm = position.X;float yPosOfWm = position.Y; /设置水印的位置#region/switch (position)/ case ImagePosition.BottomMiddle:/ xPosOfWm = phWidth / 2;/ yPosOfWm = phHeight - wmHeight - 10;/ break;/ case ImagePosition.Center:/ xPosOfWm = phWidth / 2;/ yPosOfWm = phHeight / 2;/ break;/ case ImagePosition.LeftBottom:/ xPosOfWm = wmWidth;/ yPosOfWm = phHeight - wmHeight - 10;/ break;/ case ImagePosition.LeftTop:/ xPosOfWm = wmWidth / 2;/ yPosOfWm = wmHeight / 2;/ break;/ case ImagePosition.RightTop:/ xPosOfWm = phWidth - wmWidth - 10;/ yPosOfWm = wmHeight;/ break;/ case ImagePosition.RigthBottom:/ xPosOfWm = phWidth - wmWidth - 10;/ yPosOfWm = phHeight - wmHeight - 10;/ break;/ case ImagePosition.TopMiddle:/ xPosOfWm = phWidth / 2;/ yPosOfWm = wmWidth;/ break;/ default:/ xPosOfWm = wmWidth;/ yPosOfWm = phHeight - wmHeight - 10;/ break;/ /封装文本布局信息（如对齐、文字方向和 Tab 停靠位），显示操作（如省略号插入和国家标准 (National) 数字替换）和 OpenType 功能。#endregionStringFormat StrFormat = new StringFormat(); /定义需要印的文字居中对齐StrFormat.Alignment = StringAlignment.Center;/SolidBrush:定义单色画笔。画笔用于填充图形形状，如矩形、椭圆、扇形、多边形和封闭路径。/这个画笔为描绘阴影的画笔，呈灰色int m_alpha = Convert.ToInt32(256 * alpha);SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(m_alpha, 0, 0, 0);/描绘文字信息，这个图层向右和向下偏移一个像素，表示阴影效果/DrawString 在指定矩形并且用指定的 Brush 和 Font 对象绘制指定的文本字符串。grPhoto.DrawString(waterWords, /string of textcrFont, /fontsemiTransBrush2, /Brushnew PointF(xPosOfWm + 1, yPosOfWm + 1), /PositionStrFormat);/从四个 ARGB 分量（alpha、红色、绿色和蓝色）值创建 Color 结构，这里设置透明度为153/这个画笔为描绘正式文字的笔刷，呈白色SolidBrush semiTransBrush = new SolidBrush(color);/第二次绘制这个图形，建立在第一次描绘的基础上grPhoto.DrawString(waterWords, /string of textcrFont, /fontsemiTransBrush, /Brushnew PointF(xPosOfWm, yPosOfWm), /PositionStrFormat);/imgPhoto是我们建立的用来装载最终图形的Image对象/bmPhoto是我们用来制作图形的容器，为Bitmap对象imgPhoto = bmPhoto;/释放资源，将定义的Graphics实例grPhoto释放，grPhoto功德