.net图案水印制作
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
{
/**/
///<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
{
#region 添加水印
/// <summary>
/// 添加水印
/// </summary>
/// <param name="picBt"></param>
/// <param name="waterWords"></param>
/// <param name="alpha"></param>
/// <param name="posf"></param>
/// <param name="fRewrite"></param>
/// <param name="color"></param>
/// <returns></returns>
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 text
crFont, //font
semiTransBrush2, //Brush
new PointF(xPosOfWm + 1, yPosOfWm + 1), //Position
StrFormat);
SolidBrush semiTransBrush = new SolidBrush(color);
grPho.DrawString(waterWords, //string of text
crFont, //font
semiTransBrush, //Brush
new PointF(xPosOfWm, yPosOfWm), //Position
StrFormat);
imgPho = bmPho;
//imgPho.Save("d:\\a.jpg");
return SetImageToByte(imgPho);
}
#endregion
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
///<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);
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>
/// <param name="color">生成水印的颜色</param>
/// <param name="filename">生成生水印的文件名(名字为原文件+_+自定义名)</param>
/// <returns></returns>
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
/// <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>
/// <param name="color">生成水印的颜色</param>
/// <param name="filename">生成生水印的文件名(名字为原文件+_+自定义名)</param>
/// <returns></returns>
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[] { 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", 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 * .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。
#endregion
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, 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 text
crFont, //font
semiTransBrush2, //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);
//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)
{
imgPhoto.Save(sourcePicture);
}
else
{
// 目标图片名称及全路径
string targetImage = sourcePicture.Replace(System.IO.Path.GetExtension(sourcePicture), "") + "_" + filename + "" + 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();
}
}
/// <summary>
/// image转换为byte
/// </summary>
/// <param name="pic"></param>
/// <returns></returns>
public byte[] SetImageToByte(Image pic)
{
System.IO.MemoryStream Ms = new MemoryStream();
pic.Save(Ms, System.Drawing.Imaging.ImageFormat.Jpeg);
//this.pcbEquipment.Image.Save(Ms, System.Drawing.Imaging.ImageFormat.Jpeg);
byte[] img = new byte[Ms.Length];
Ms.Position = 0;
Ms.Read(img, 0, Convert.ToInt32(Ms.Length));
Ms.Close();
return img;
}
#endregion
}
}
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