/// <summary>
/// 图片水印处理方法
/// </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（传送正确的代码）</param>
public static string ImageWatermark(string path, string waterpath, WaterLocation location)
{
string kz_name = Path.GetExtension(path);
if (_imageExtList.Contains(kz_name))
{
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 loca = GetLocation(location, img, waterimg);
g.DrawImage(waterimg, new Rectangle(int.Parse(loca[0].ToString()), int.Parse(loca[1].ToString()), waterimg.Width, waterimg.Height));
waterimg.Dispose();
g.Dispose();
string newpath = Path.GetDirectoryName(path) + filename + kz_name;
img.Save(newpath);
img.Dispose();
File.Copy(newpath, path, true);
if (File.Exists(newpath))
{
File.Delete(newpath);
}
}
return(path);
}
/// <summary>
/// 文字水印位置的方法
/// </summary>
/// <param name="location">位置代码</param>
/// <param name="img">图片对象</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>
private static ArrayList GetLocation(WaterLocation location, Image img, float width, float height)
{
#region
ArrayList loca = new ArrayList(); //定义数组存储位置
float x = 10;
float y = 10;
if (location == WaterLocation.LT)
{
loca.Add(x);
loca.Add(y);
}
else if (location == WaterLocation.T)
{
x = img.Width / 2 - (width * height) / 2;
loca.Add(x);
loca.Add(y);
}
else if (location == WaterLocation.RT)
{
x = img.Width - width;
}
else if (location == WaterLocation.LC)
{
y = img.Height / 2;
}
else if (location == WaterLocation.C)
{
x = img.Width / 2 - (width) / 2;
y = img.Height / 2;
}
else if (location == WaterLocation.RC)
{
x = img.Width - width;
y = img.Height / 2;
}
else if (location == WaterLocation.LB)
{
y = img.Height - height - 5;
}
else if (location == WaterLocation.B)
{
x = img.Width / 2 - (width) / 2;
y = img.Height - height - 5;
}
else
{
x = img.Width - width;
y = img.Height - height - 5;
}
loca.Add(x);
loca.Add(y);
return(loca);
#endregion
}
/// <summary>
/// 图片水印位置处理方法
/// </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>
private static ArrayList GetLocation(WaterLocation location, Image img, Image waterimg)
{
ArrayList loca = new ArrayList();
int x = 0;
int y = 0;
if (location == WaterLocation.LT)
{
x = 10;
y = 10;
}
else if (location == WaterLocation.T)
{
x = img.Width / 2 - waterimg.Width / 2;
y = img.Height - waterimg.Height;
}
else if (location == WaterLocation.RT)
{
x = img.Width - waterimg.Width;
y = 10;
}
else if (location == WaterLocation.LC)
{
x = 10;
y = img.Height / 2 - waterimg.Height / 2;
}
else if (location == WaterLocation.C)
{
x = img.Width / 2 - waterimg.Width / 2;
y = img.Height / 2 - waterimg.Height / 2;
}
else if (location == WaterLocation.RC)
{
x = img.Width - waterimg.Width;
y = img.Height / 2 - waterimg.Height / 2;
}
else if (location == WaterLocation.LB)
{
x = 10;
y = img.Height - waterimg.Height;
}
else if (location == WaterLocation.B)
{
x = img.Width / 2 - waterimg.Width / 2;
y = img.Height - waterimg.Height;
}
else
{
x = img.Width - waterimg.Width;
y = img.Height - waterimg.Height;
}
loca.Add(x);
loca.Add(y);
return(loca);
}
/// <summary>
/// 文字水印处理方法
/// </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>
public static string LetterWatermark(string path, int size, string letter, Color color, WaterLocation location, bool adjustSize = true)
{
#region
string kz_name = Path.GetExtension(path);
if (_imageExtList.Contains(kz_name))
{
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 gs = Graphics.FromImage(img);
Font font = new Font("宋体", size);
var sizeF = gs.MeasureString(letter, font);
if (adjustSize)
{
while ((sizeF.Width * 2 > img.Width || sizeF.Height * 2 > img.Height) && size > 8)
{
size--;
font = new Font("宋体", size);
sizeF = gs.MeasureString(letter, font);
}
if (sizeF.Width * 2 > img.Width || sizeF.Height * 2 > img.Height)
{
return(path);
}
}
ArrayList loca = GetLocation(location, img, sizeF.Width, sizeF.Height);
Brush br = new SolidBrush(color);
gs.DrawString(letter, font, br, float.Parse(loca[0].ToString()), float.Parse(loca[1].ToString()));
gs.Dispose();
string newpath = Path.GetDirectoryName(path) + filename + kz_name;
img.Save(newpath);
img.Dispose();
File.Copy(newpath, path, true);
if (File.Exists(newpath))
{
File.Delete(newpath);
}
}
return(path);
#endregion
}
