public static Image Watermark(Image image, string watermarkPath, string mark, WatermarkPosition position)
{
if (image == null)
{
throw new ArgumentNullException("原图片不能为null");
}
if (string.IsNullOrEmpty(mark))
{
throw new ArgumentException("水印文字不能为空");
}
using (Graphics graphics = Graphics.FromImage(image))
{
graphics.DrawImage(image, 0, 0, image.Width, image.Height);
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.TextRenderingHint = TextRenderingHint.ClearTypeGridFit;
graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
using (Font font = new Font("Arial", 10f, FontStyle.Bold | FontStyle.Italic))
{
using (Brush brush = new SolidBrush(Color.White))
{
SizeF ef = graphics.MeasureString(mark, font);
float x;
float y;
switch (position)
{
case WatermarkPosition.Bottom_left:
x = 10f;
y = (float)image.Height - ef.Height - 10f;
goto IL_16F;
case WatermarkPosition.Top_left:
x = 10f;
y = 10f;
goto IL_16F;
case WatermarkPosition.Top_right:
x = (float)image.Width - ef.Width - 10f;
y = 10f;
goto IL_16F;
case WatermarkPosition.Center:
x = (float)image.Width / 2f - ef.Width / 2f;
y = (float)image.Height / 2f - ef.Height / 2f;
goto IL_16F;
}
x = (float)image.Width - ef.Width - 10f;
y = (float)image.Height - ef.Height - 10f;
IL_16F:
graphics.DrawString(mark, font, brush, x, y);
ImageUtil.SaveImage(image, watermarkPath);
}
}
}
return(image);
}
public static Image Thumbnail(Image image, string thumbnailPath, int width, int height)
{
if (image == null)
{
throw new ArgumentNullException("原图片不能为null");
}
if (width <= 0 || height <= 0)
{
throw new ArgumentException("缩略图宽度或高度不能小于或等于零");
}
image = image.GetThumbnailImage(width, height, null, IntPtr.Zero);
ImageUtil.SaveImage(image, thumbnailPath);
return(image);
}
