传图片加水印(文字水印，图片水印，文字+图片水印)
效果图：
图
500)this.width=500" border=0<
水印
500)this.width=500" border=0<
给图片加水印以后（注意右上角+正下方）
500)this.width=500" border=0<
代码：
DrawImg.cs
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
public class DrawImg
{
private string WorkingDirectory = string.Empty ; //路径
private string ImageName = string.Empty; //被处理的图片
private string ImageWater = string.Empty; //水印图片
private string FontString = string.Empty; //水印文字
enum DealType{NONE,WaterImage,WaterFont,DoubleDo}; //枚举命令
private DealType dealtype;
public DrawImg()
{}
public string PublicWorkingDirectory
{
get
{
return WorkingDirectory;
}
set
{
WorkingDirectory = value;
}
}
public string PublicImageName
{
get
{
return ImageName;
}
set
{
ImageName = value;
}
}
public string PublicImageWater
{
get
{
return ImageWater;
}
set //设置了水印图片的话说明是要水印图片效果的
{
dealtype = DealType.WaterImage;
ImageWater = value;
}
}
public string PublicFontString
{
get
{
return FontString;
}
set //设置了水印文字的话说明是要水印文字效果的
{
dealtype = DealType.WaterFont;
FontString = value;
}
}
public void DealImage()
{
IsDouble();
switch( dealtype )
{
case DealType.WaterFont: WriteFont(); break;
case DealType.WaterImage: WriteImg(); break;
case DealType.DoubleDo: WriteFontAndImg(); break;
}
}
private void IsDouble()
{
if(ImageWater+""!="" && FontString+""!="")
{
dealtype = DealType.DoubleDo;
}
}
private void WriteFont()
{
//set a working directory
//string WorkingDirectory = @"C:Watermark_srcWaterPic";
//define a string of text to use as the Copyright message
//string Copyright = "Copyright ?2002 - AP Photo/David Zalubowski";
//create a image object containing the photograph to watermark
Image imgPhoto = Image.FromFile(WorkingDirectory + ImageName);
int phWidth = imgPhoto.Width;
int phHeight = imgPhoto.Height;
//create a Bitmap the Size of the original photograph
Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
//load the Bitmap into a Graphics object
Graphics grPhoto = Graphics.FromImage(bmPhoto);
//------------------------------------------------------------
//Step #1 - Insert Copyright message
//------------------------------------------------------------
//Set the rendering quality for this Graphics object
grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
//Draws the photo Image object at original size to the graphics object.
grPhoto.DrawImage(
imgPhoto, // Photo Image object
new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
0, // x-coordinate of the portion of the source image to draw.
0, // y-coordinate of the portion of the source image to draw.
phWidth, // Width of the portion of the source image to draw.
phHeight, // Height of the portion of the source image to draw.
GraphicsUnit.Pixel); // Units of measure
//-------------------------------------------------------
//to maximize the size of the Copyright message we will
//test multiple Font sizes to determine the largest posible
//font we can use for the width of the Photograph
//define an array of point sizes you would like to consider as possiblities
//-------------------------------------------------------
int[] sizes = new int[]{16,14,12,10,8,6,4};
Font crFont = null;
SizeF crSize = new SizeF();
//Loop through the defined sizes checking the length of the Copyright string
//If its length in pixles is less then the image width choose this Font size.
for (int i=0 ;i<7; i++)
{
