private static Point SetMarkPoint(WaterPositionMode position, Image watermak, Image orImage)
{
int x = 0;
int y = 0;
switch (position)
{
case WaterPositionMode.LeftTop:
x = 8;
y = 8;
break;
case WaterPositionMode.LeftBottom:
x = 8;
y = orImage.Height - watermak.Height;
break;
case WaterPositionMode.RightTop:
x = orImage.Width * 1 - watermak.Width;
y = 8;
break;
case WaterPositionMode.RightBottom:
x = orImage.Width - watermak.Width;
y = orImage.Height - watermak.Height;
break;
case WaterPositionMode.Center:
x = orImage.Width / 3;
y = orImage.Height / 2 - watermak.Height / 2;
break;
}
return(new Point(x, y));
}
/// <summary>
/// 添加图片水印
/// </summary>
/// <param name="path">原图片绝对地址</param>
/// <param name="suiyi">水印文件</param>
/// <param name="pos">水印位置</param>
private static byte[] addWaterMark(Image image, string suiyi, WaterPositionMode pos)
{
try
{
Bitmap b = new Bitmap(image.Width, image.Height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
Graphics g = Graphics.FromImage(b);
g.Clear(Color.White);
g.DrawImage(image, 0, 0, image.Width, image.Height);
System.Drawing.Image watermark = new Bitmap(suiyi);
System.Drawing.Imaging.ImageAttributes imageAttributes = new System.Drawing.Imaging.ImageAttributes();
System.Drawing.Imaging.ColorMap colorMap = new System.Drawing.Imaging.ColorMap();
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
System.Drawing.Imaging.ColorMap[] remapTable = { colorMap };
imageAttributes.SetRemapTable(remapTable, System.Drawing.Imaging.ColorAdjustType.Bitmap);
float[][] colorMatrixElements =
{
new float[] { 1.0f, 0.0f, 0.0f, 0.0f, 0.0f },
new float[] { 0.0f, 1.0f, 0.0f, 0.0f, 0.0f },
new float[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f },
new float[] { 0.0f, 0.0f, 0.0f, 1.0f, 0.0f },//设置透明度
new float[] { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f }
};
System.Drawing.Imaging.ColorMatrix colorMatrix = new System.Drawing.Imaging.ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(colorMatrix, System.Drawing.Imaging.ColorMatrixFlag.Default, System.Drawing.Imaging.ColorAdjustType.Bitmap);
int xpos = 0;
int ypos = 0;
Point position = SetMarkPoint(pos, watermark, image);
xpos = position.X; // ((image.Width - watermark.Width) - 50);//水印位置
ypos = position.Y; //image.Height - watermark.Height - 50;//水印位置
g.DrawImage(watermark, new Rectangle(xpos, ypos, watermark.Width, watermark.Height), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes);
watermark.Dispose();
imageAttributes.Dispose();
MemoryStream ms = new MemoryStream();
b.Save(ms, ImageFormat.Bmp);
byte[] byteImage = ms.ToArray();
b.Dispose();
image.Dispose();
g.Dispose();
return(byteImage);
}
catch (Exception ex)
{
MemoryStream ms = new MemoryStream();
image.Save(ms, ImageFormat.Bmp);
return(ms.ToArray());
}
}
/// <summary>
/// 给图片加水印文字
/// </summary>
/// <param name="oldpath">原图文件</param>
/// <param name="savepath">新图文件</param>
/// <param name="watertext">水印文字</param>
/// <param name="position">水印位置</param>
/// <param name="color">颜色</param>
/// <param name="alpha">数值</param>
public static void AddWaterText(string oldPath, string newPath, string waterText, WaterPositionMode position, string color, int alpha)
{
Image image = Image.FromFile(oldPath);
if (File.Exists(newPath))
{
File.Delete(newPath);
}
System.IO.File.Copy(oldPath, newPath);
int lucencyPercent = 25;
Bitmap bitmap = new Bitmap(image.Width, image.Height);
Graphics graphics = Graphics.FromImage(bitmap);
graphics.Clear(Color.White);
graphics.DrawImage(image, new Rectangle(0, 0, image.Width, image.Height), 0, 0, image.Width, image.Height, GraphicsUnit.Pixel);
Font font = new Font("arial", 12);
SizeF ziSizeF = new SizeF();
ziSizeF = graphics.MeasureString(waterText, font);
float x = 0f;
float y = 0f;
switch (position)
{
case WaterPositionMode.LeftTop:
x = ziSizeF.Width / 2f;
y = 8f;
break;
case WaterPositionMode.LeftBottom:
x = ziSizeF.Width / 2f;
y = image.Height - ziSizeF.Height;
break;
case WaterPositionMode.RightTop:
x = image.Width * 1f - ziSizeF.Width / 2f;
y = 8f;
break;
case WaterPositionMode.RightBottom:
x = image.Width - ziSizeF.Width;
y = image.Height - ziSizeF.Height;
break;
case WaterPositionMode.Center:
x = image.Width / 2;
y = image.Height / 2 - ziSizeF.Height / 2;
break;
}
try
{
StringFormat stringFormat = new StringFormat {
Alignment = StringAlignment.Center
};
SolidBrush solidBrush = new SolidBrush(Color.FromArgb(alpha, 0, 0, 0));
graphics.DrawString(waterText, font, solidBrush, x + 1f, y + 1f, stringFormat);
SolidBrush brush = new SolidBrush(Color.FromArgb(alpha, ColorTranslator.FromHtml(color)));
graphics.DrawString(waterText, font, brush, x, y, stringFormat);
solidBrush.Dispose();
brush.Dispose();
bitmap.Save(newPath, ImageFormat.Jpeg);
}
catch (Exception e)
{
}
finally
{
bitmap.Dispose();
image.Dispose();
}
}
