/// <summary>
/// 设置文字水印
/// </summary>
/// <param name="path">图片路径（绝对路径）</param>
/// <param name="size">字体大小</param>
/// <param name="letter">水印文字</param>
/// <param name="color">颜色</param>
/// <param name="location">水印位置</param>
/// <returns></returns>
public static string LetterWatermark(string path, int size, string letter, Color color,
ImageLocationMode location)
{
string extName = Path.GetExtension(path);
if (extName == ".jpg" || extName == ".bmp" || extName == ".jpeg")
{
DateTime time = DateTime.Now;
string fileName = "" + time.Year.ToString() + time.Month.ToString() + time.Day.ToString() +
time.Hour.ToString() + time.Minute.ToString() + time.Second.ToString() +
time.Millisecond.ToString();
Image img = Bitmap.FromFile(path);
Graphics g = Graphics.FromImage(img);
ArrayList coors = GetLocation(location, img, size, letter.Length);
Font font = new Font("宋体", size);
Brush br = new SolidBrush(color);
g.DrawString(letter, font, br, float.Parse(coors[0].ToString()), float.Parse(coors[1].ToString()));
g.Dispose();
string newPath = Path.GetDirectoryName(path) + fileName + extName;
img.Save(newPath);
img.Dispose();
File.Copy(newPath, path, true);
if (File.Exists(newPath))
{
File.Delete(newPath);
}
}
return(path);
}
/// <summary>
/// 获取水印位置
/// </summary>
/// <param name="location">水印位置</param>
/// <param name="img">需要添加水印的图片</param>
/// <param name="waterImg">水印图片</param>
/// <returns></returns>
private static ArrayList GetLocation(ImageLocationMode location, Image img, Image waterImg)
{
ArrayList coords = new ArrayList();
int x = 0;
int y = 0;
switch (location)
{
case ImageLocationMode.LeftTop:
x = 10;
y = 10;
break;
case ImageLocationMode.Top:
x = img.Width / 2 - waterImg.Width / 2;
y = img.Height - waterImg.Height;
break;
case ImageLocationMode.RightTop:
x = img.Width - waterImg.Width;
y = 10;
break;
case ImageLocationMode.LeftCenter:
x = 10;
y = img.Height / 2 - waterImg.Height / 2;
break;
case ImageLocationMode.Center:
x = img.Width / 2 - waterImg.Width / 2;
y = img.Height / 2 - waterImg.Height / 2;
break;
case ImageLocationMode.RightCenter:
x = img.Width - waterImg.Width;
y = img.Height / 2 - waterImg.Height / 2;
break;
case ImageLocationMode.LeftBottom:
x = 10;
y = img.Height - waterImg.Height;
break;
case ImageLocationMode.Bottom:
x = img.Width / 2 - waterImg.Width / 2;
y = img.Height - waterImg.Height;
break;
case ImageLocationMode.RightBottom:
x = img.Width - waterImg.Width;
y = img.Height - waterImg.Height;
break;
default:
break;
}
coords.Add(x);
coords.Add(y);
return(coords);
}
/// <summary>
/// 获取水印位置
/// </summary>
/// <param name="location">水印位置</param>
/// <returns></returns>
private static Gravity GetLocation(ImageLocationMode location)
{
switch (location)
{
case ImageLocationMode.LeftTop:
return(Gravity.Northwest);
case ImageLocationMode.Top:
return(Gravity.North);
case ImageLocationMode.RightTop:
return(Gravity.Northeast);
case ImageLocationMode.RightCenter:
return(Gravity.East);
case ImageLocationMode.RightBottom:
return(Gravity.Southeast);
case ImageLocationMode.Bottom:
return(Gravity.South);
case ImageLocationMode.LeftBottom:
return(Gravity.Southwest);
case ImageLocationMode.LeftCenter:
return(Gravity.West);
case ImageLocationMode.Center:
return(Gravity.Center);
default:
return(Gravity.Center);
}
}
/// <summary>
/// 设置图片水印，使用MagickImage.Net
/// </summary>
/// <param name="path">需要加载水印的图片路径（绝对路径）</param>
/// <param name="waterpath">水印图片（绝对路径）</param>
/// <param name="location">水印位置</param>
/// <returns></returns>
public static string ImageWatermarkByMagick(string path, string waterpath, ImageLocationMode location)
{
string extName = Path.GetExtension(path);
if (string.IsNullOrEmpty(extName))
{
return(path);
}
extName = extName.ToLower();
if (!(extName == ".jpg" || extName == ".bmp" || extName == ".jpeg" || extName == ".png"))
{
return(path);
}
// 读取需要水印的图片
using (ImageMagick.MagickImage image = new ImageMagick.MagickImage(path))
{
// 读取水印图片
using (ImageMagick.MagickImage watermark = new ImageMagick.MagickImage(waterpath))
{
// 设置水印透明度
//watermark.Evaluate(Channels.Alpha, EvaluateOperator.Divide, 7);
// 设置绘制水印位置
image.Composite(watermark, GetLocation(location), CompositeOperator.Over);
}
image.Resize(image.Width, image.Height);
image.Quality = 75;
image.CompressionMethod = ImageMagick.CompressionMethod.JPEG;
image.Write(path);
return(path);
}
}
/// <summary>
/// 设置图片水印
/// </summary>
/// <param name="path">需要加载水印的图片路径（绝对路径）</param>
/// <param name="waterpath">水印图片（绝对路径）</param>
/// <param name="location">水印位置</param>
/// <returns></returns>
public static string ImageWatermark(string path, string waterpath, ImageLocationMode location)
{
string extName = Path.GetExtension(path);
if (extName == ".jpg" || extName == ".bmp" || extName == ".jpeg")
{
DateTime time = DateTime.Now;
string fileName = "" + time.Year.ToString() + time.Month.ToString() + time.Day.ToString() +
time.Hour.ToString() + time.Minute.ToString() + time.Second.ToString() +
time.Millisecond.ToString();
Image img = Bitmap.FromFile(path);
Image waterImg = Image.FromFile(waterpath);
Graphics g = Graphics.FromImage(img);
ArrayList coors = GetLocation(location, img, waterImg);
g.DrawImage(waterImg, new Rectangle(int.Parse(coors[0].ToString()), int.Parse(coors[1].ToString()),
waterImg.Width, waterImg.Height));
waterImg.Dispose();
g.Dispose();
string newPath = Path.GetDirectoryName(path) + fileName + extName;
img.Save(newPath);
img.Dispose();
File.Copy(newPath, path, true);
if (File.Exists(newPath))
{
File.Delete(newPath);
}
}
return(path);
}
/// <summary>
/// 获取水印位置
/// </summary>
/// <param name="location">水印位置</param>
/// <param name="img">需要添加水印的图片</param>
/// <param name="width">宽(当水印类型为文字时,传过来的就是字体的大小)</param>
/// <param name="height">高(当水印类型为文字时,传过来的就是字符的长度)</param>
/// <returns></returns>
private static ArrayList GetLocation(ImageLocationMode location, Image img, int width, int height)
{
ArrayList coords = new ArrayList();
float x = 10;
float y = 10;
switch (location)
{
case ImageLocationMode.LeftTop:
x = 10;
y = 10;
break;
case ImageLocationMode.Top:
x = img.Width / 2 - (width * height) / 2;
break;
case ImageLocationMode.RightTop:
x = img.Width - width * height;
break;
case ImageLocationMode.LeftCenter:
y = img.Height / 2;
break;
case ImageLocationMode.Center:
x = img.Width / 2 - (width * height) / 2;
y = img.Height / 2;
break;
case ImageLocationMode.RightCenter:
x = img.Width - height;
y = img.Height / 2;
break;
case ImageLocationMode.LeftBottom:
y = img.Height - width - 5;
break;
case ImageLocationMode.Bottom:
x = img.Width / 2 - (width * height) / 2;
y = img.Height - width - 5;
break;
case ImageLocationMode.RightBottom:
x = img.Width - width * height;
y = img.Height - width - 5;
break;
default:
break;
}
coords.Add(x);
coords.Add(y);
return(coords);
}
/// <summary>
/// 设置图片水印
/// </summary>
/// <param name="path">需要加载水印的图片路径（绝对路径）</param>
/// <param name="waterpath">水印图片（绝对路径）</param>
/// <param name="location">水印位置</param>
/// <returns></returns>
public static string ImageWatermark(string path, string waterpath, ImageLocationMode location)
{
string extName = Path.GetExtension(path);
if (extName == ".jpg" || extName == ".bmp" || extName == ".jpeg" || extName == ".png")
{
DateTime time = DateTime.Now;
string fileName = "" + time.Year.ToString() + time.Month.ToString() + time.Day.ToString() +
time.Hour.ToString() + time.Minute.ToString() + time.Second.ToString() +
time.Millisecond.ToString();
//Image img = null;
//Graphics g = null;
//try
//{
// img = Bitmap.FromFile(path);
// g = Graphics.FromImage(img);
// Image waterImg = Image.FromFile(waterpath);
// ArrayList coors = GetLocation(location, img, waterImg);
// g.DrawImage(waterImg, new Rectangle(int.Parse(coors[0].ToString()), int.Parse(coors[1].ToString()),
// waterImg.Width, waterImg.Height));
// waterImg.Dispose();
// string newPath = Path.GetDirectoryName(path) + fileName + extName;
// img.Save(newPath);
// File.Copy(newPath, path, true);
// if (File.Exists(newPath))
// {
// File.Delete(newPath);
// }
//}
//catch (OutOfMemoryException ex)
//{
// if (img != null)
// {
// img.Dispose();
// img = null;
// }
// throw ex;
// //return ImageWatermarkByMagick(path, waterpath, location);
//}
//finally
//{
// if (img != null)
// {
// img.Dispose();
// }
// if (g != null)
// {
// g.Dispose();
// }
//}
Image img = Image.FromFile(path);
// 处理不在指定范围内的图片
if (!Enum.IsDefined(typeof(PixelFormat), img.PixelFormat))
{
int width = img.Width;
int height = img.Height;
img.Dispose();
img = null;
using (Bitmap temp = new Bitmap(path))
{
img = temp.Clone(new Rectangle(0, 0, width, height), PixelFormat.Format32bppRgb);
}
}
Image waterImg = Image.FromFile(waterpath);
using (Graphics g = Graphics.FromImage(img))
{
ArrayList coors = GetLocation(location, img, waterImg);
g.DrawImage(waterImg, new Rectangle(int.Parse(coors[0].ToString()), int.Parse(coors[1].ToString()),
waterImg.Width, waterImg.Height));
waterImg.Dispose();
}
string newPath = Path.GetDirectoryName(path) + fileName + extName;
img.Save(newPath);
img.Dispose();
File.Copy(newPath, path, true);
if (File.Exists(newPath))
{
File.Delete(newPath);
}
}
return(path);
}
