郑德才博客

using System;
using System.Data;
using System.Configuration;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

public enum ImagePosition
{
/**/
/// < summary>
/// 左上
/// < /summary>
LeftTop,
/**/
/// < summary>
/// 左下
/// < /summary>
LeftBottom,
/**/
/// < summary>
/// 右上
/// < /summary>
RightTop,
/**/
/// < summary>
/// 右下
/// < /summary>
RigthBottom,
/**/
/// < summary>
/// 顶部居中
/// < /summary>
TopMiddle,
/**/
/// < summary>
/// 底部居中
/// < /summary>
BottomMiddle,
/**/
/// < summary>
/// 中心
/// < /summary>
Center
}
/**/
/// < summary>
/// 图像操作类(主要用于给图片加上透明文字水印)
/// < /summary>
public class ImageWater_Word
{
private string _ErrMsg;
#region 出错信息
/**/
/// < summary>
/// 出错信息
/// < /summary>
public string ErrMsg
{
get { return _ErrMsg; }
set { _ErrMsg = value; }
}
#endregion


#region 将文件转换成流
//public byte[] SetImageToByteArray(string fileName, ref string fileSize)
/**/
/// < summary>
/// 将文件转换成流
/// < /summary>
/// < param name="fileName">文件全路径< /param>
/// < returns>< /returns>
private byte[] SetImageToByteArray(string fileName)
{
byte[] image = null;
try
{
FileStream fs = new FileStream(fileName, FileMode.Open);
FileInfo fileInfo = new FileInfo(fileName);
//fileSize = Convert.ToDecimal(fileInfo.Length / 1024).ToString("f2") + " K";
int streamLength = (int)fs.Length;
image = new byte[streamLength];
fs.Read(image, 0, streamLength);
fs.Close();
return image;
}
catch
{
return image;
}
}
#endregion

#region 将byte转换成MemoryStream类型
/**/
/// < summary>
/// ASP.NET图片加水印：将byte转换成MemoryStream类型
/// < /summary>
/// < param name="mybyte">byte[]变量< /param>
/// < returns>< /returns>
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
/**/
/// < summary>
/// ASP.NET图片加水印：将byte转换成Image文件
/// < /summary>
/// < param name="mybyte">byte[]变量< /param>
/// < returns>< /returns>
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
/**/
/// < summary>
/// ASP.NET图片加水印：批量在图片上添加透明水印文字
/// < /summary>
/// < param name="arrsourcePicture">原来图片地址(路径+文件名)< /param>
/// < param name="waterWords">需要添加到图片上的文字< /param>
/// < param name="alpha">透明度(0.1~1.0之间)< /param>
/// < param name="position">文字显示的位置< /param>
/// < param name="fRewrite">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)< /param>
/// < returns>< /returns>
public bool DrawWords(string[] arrsourcePicture, string waterWords, float alpha, ImagePosition position, bool fRewrite)
{
foreach (string imgPath in arrsourcePicture)
{
if (!DrawWords(imgPath, waterWords, alpha, position, fRewrite))
{
_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
/**/
/// < summary>
/// ASP.NET图片加水印：在图片上添加透明水印文字
/// < /summary>
/// < param name="sourcePicture">原来图片地址(路径+文件名)< /param>
/// < param name="waterWords">需要添加到图片上的文字< /param>
/// < param name="alpha">透明度(0.1~1.0之间)< /param>
/// < param name="position">文字显示的位置< /param>
/// < param name="fRewrite">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)< /param>
/// < returns>< /returns>
public bool DrawWords(string sourcePicture, string waterWords, float alpha, ImagePosition position, bool fRewrite)
{
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;
bool photof = false;
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bitmap
bmPhoto.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[] { 84,80,76,72,68,64,60,56,52,48,44,40,36,32,28,24,20,16,12,10,8,6,4};

//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();
int hh = 0;
//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", sizes[i], 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 * .03);

//定义在图片上文字的位置
float wmHeight = crSize.Height;
float wmWidth = crSize.Width;


float xPosOfWm;
float yPosOfWm;

//设置水印的位置
switch (position)
{
case ImagePosition.BottomMiddle:
xPosOfWm = phWidth / 2;
yPosOfWm = phHeight - wmHeight-yPixlesFromBottom;
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。
StringFormat 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, 247, 17, 28));
SolidBrush semiTransBrush2 = new SolidBrush(Color.Red);
SolidBrush semiTransBrush3= new SolidBrush(Color.FromArgb(m_alpha, 47, 51, 242));
////画图片的背景线
// for (int i = 0; i < (yPixlesFromBottom * 2 + (int)wmHeight); i++)
//{
// int x1 =0;
// int x2 = phWidth;
// int y1 =phHeight-i;
// int y2 = phHeight - i;

// grPhoto.DrawLine(new Pen(semiTransBrush3), x1, y1, x2, y2);

//}

//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 text
crFont, //font
semiTransBrush3, //Brush
new PointF(xPosOfWm + 1, yPosOfWm + 1), //Position
StrFormat);

//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.FromArgb(153, 255, 255, 255));

////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 text
// crFont, //font
// semiTransBrush, //Brush
// new PointF(xPosOfWm, yPosOfWm), //Position
// StrFormat);

//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功德圆满
grPhoto.Dispose();

//将grPhoto保存
if (fRewrite)
{
if (File.Exists(sourcePicture))
{
File.Delete(sourcePicture);
}
imgPhoto.Save(sourcePicture.Replace(System.IO.Path.GetExtension(sourcePicture), "") + fileExtension);
}
else
{
// 目标图片名称及全路径
string targetImage = sourcePicture.Replace(System.IO.Path.GetExtension(sourcePicture), "") + "_0607" + fileExtension;
imgPhoto.Save(targetImage);
}
//imgPhoto.Dispose();
photof=true;
if (imgPhoto != null)
imgPhoto.Dispose();
if (bmPhoto != null)
bmPhoto.Dispose();
if (grPhoto != null)
grPhoto.Dispose();
return photof;
}
catch (Exception ex)
{
_ErrMsg = ex.Message;
photof= false;
if (imgPhoto != null)
imgPhoto.Dispose();
if (bmPhoto != null)
bmPhoto.Dispose();
if (grPhoto != null)
grPhoto.Dispose();
return photof;
}
finally
{

}


}
#endregion


/**/
/// < summary>
/// ASP.NET图片加水印：在图片上添加透明水印文字
/// < /summary>
/// < param name="sourcePicture">原来图片地址(路径+文件名)< /param>
/// < param name="waterPicture">需要添加到图片上的图片< /param>
/// < param name="alpha">透明度(0.1~1.0之间)< /param>
/// < param name="fRewrite">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)< /param>
/// < returns>< /returns>
#region 在图片上添加透明水印图片
public bool DrawImages(string sourcePicture, string waterPicture, float alpha, ImagePosition position, bool fRewrite)
{
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bitmap
bmPhoto.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

//限制水印图片的大小为要添加水印的图片的十分之一
System.Drawing.Image copyImage = Image.FromStream(ByteToStream(SetImageToByteArray(waterPicture)));
int wmHeight = copyImage.Height;
int wmWidth = copyImage.Width;
int rate = copyImage.Width / (phWidth / 10);
if (rate == 0 || rate == 1)
{
wmHeight = copyImage.Height;
wmWidth = copyImage.Width;
}
else
{
wmWidth = phWidth / 10;
wmHeight = phHeight / (rate + 2);
}
//控制水印图片的位置
int xPosOfWm;
int yPosOfWm;
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;
}

//控制水印图片的透明度
ImageAttributes imageAttributes = new ImageAttributes();
ColorMap colorMap = new ColorMap();

colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = { colorMap };

imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);

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

ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);

imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
//复制水印图片到原图片上

grPhoto.DrawImage(copyImage, new Rectangle(xPosOfWm, yPosOfWm,

wmWidth, wmHeight), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel, imageAttributes);
//////////////////////////////
imgPhoto = bmPhoto;
//释放资源，将定义的Graphics实例grPhoto释放，grPhoto功德圆满
grPhoto.Dispose();

//将grPhoto保存
if (fRewrite)
{
if (File.Exists(sourcePicture))
{
File.Delete(sourcePicture);
}
imgPhoto.Save(sourcePicture.Replace(System.IO.Path.GetExtension(sourcePicture), "") + "_new" + fileExtension);
}
else
{
// 目标图片名称及全路径
string targetImage = sourcePicture.Replace(System.IO.Path.GetExtension(sourcePicture), "") + "_0607" + fileExtension;
imgPhoto.Save(targetImage);
}
//imgPhoto.Dispose();
return true;
}
catch (Exception ex)
{
_ErrMsg = ex.Message;
return false;
}
finally
{
if (imgPhoto != null)
imgPhoto.Dispose();
if (bmPhoto != null)
bmPhoto.Dispose();
if (grPhoto != null)
grPhoto.Dispose();
}

}
#endregion
}