/// <summary>
/// 图片水印处理方法
/// </summary>
/// <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 ImageProcess ImageWatermark(string waterpath, EnumLocation location)
{
Bitmap waterimg = Image.FromFile(waterpath) as Bitmap;
var waterimg2 = new Bitmap(waterimg.Width, waterimg.Height);
var wid = waterimg.Width;
var hei = waterimg.Height;
for (int i = 0; i < wid; i++)
{
for (int j = 0; j < hei; j++)
{
var baseColor = waterimg.GetPixel(i, j);
if (baseColor.A != 0)
{
baseColor = Color.FromArgb(ColorTransparent, baseColor.R, baseColor.G, baseColor.B);
}
waterimg2.SetPixel(i, j, baseColor);
}
}
ArrayList loca = GetLocation(location, processImage, waterimg2.Width, waterimg2.Height);
using (var g = Graphics.FromImage(processImage))
{
g.DrawImage(waterimg2, new Rectangle(int.Parse(loca[0].ToString()), int.Parse(loca[1].ToString()), waterimg.Width, waterimg.Height));
waterimg.Dispose();
};
return this;
}
/// <summary>
/// 水印位置计算
/// </summary>
/// <param name="location">水印位置</param>
/// <param name="img">需要添加水印的图片</param>
/// <param name="waterWidth">水印宽度</param>
/// <param name="waterHeight">水印高度</param>
private static ArrayList GetLocation(EnumLocation location, Image img, int waterWidth, int waterHeight)
{
ArrayList loca = new ArrayList();
int x = 0;
int y = 0;
if (location == EnumLocation.LeftTop)
{
x = Margin;
y = Margin;
}
else if (location == EnumLocation.Top)
{
x = img.Width / 2 - waterWidth / 2;
y = Margin;
}
else if (location == EnumLocation.RightTop)
{
x = img.Width - waterWidth - 10;
y = Margin;
}
else if (location == EnumLocation.LeftCenter)
{
x = Margin;
y = img.Height / 2 - waterHeight / 2;
}
else if (location == EnumLocation.Center)
{
x = img.Width / 2 - waterWidth / 2;
y = img.Height / 2 - waterHeight / 2;
}
else if (location == EnumLocation.RightCenter)
{
x = img.Width - waterWidth - Margin;
y = img.Height / 2 - waterHeight / 2;
}
else if (location == EnumLocation.LeftBottom)
{
x = Margin;
y = img.Height - waterHeight - Margin;
}
else if (location == EnumLocation.Bottom)
{
x = img.Width / 2 - waterWidth / 2;
y = img.Height - waterHeight - Margin;
}
else if (location == EnumLocation.RightBottom)
{
x = img.Width - waterWidth - Margin;
y = img.Height - waterHeight - Margin;
}
loca.Add(x);
loca.Add(y);
return loca;
}
/// <summary>
/// 文字水印处理方法
/// </summary>
/// <param name="font">字体</param>
/// <param name="letter">水印文字</param>
/// <param name="color">颜色</param>
/// <param name="location">水印位置</param>
public ImageProcess LetterWatermark(string letter, Font font, Color color, EnumLocation location)
{
Brush br = new SolidBrush(Color.FromArgb(ColorTransparent, color.R, color.G, color.B));
using (var g = Graphics.FromImage(processImage))
{
var size = g.MeasureString(letter, font).ToSize();
ArrayList loca = GetLocation(location, processImage, size.Width, size.Height);
g.DrawString(letter, font, br, float.Parse(loca[0].ToString()), float.Parse(loca[1].ToString()));
}
return this;
}
public MissingTags(EnumLocation tagLocation)
{
Location = tagLocation;
}