/// <summary>
/// 加水印文字
/// </summary>
/// <param name="picture">imge 对象</param>
/// <param name="_watermarkText">水印文字内容</param>
/// <param name="_watermarkPosition">水印位置</param>
/// <param name="_width">被加水印图片的宽</param>
/// <param name="_height">被加水印图片的高</param>
private void addWatermarkText(Graphics picture, string _watermarkText, WaterPos _watermarkPosition, int _width, int _height)
{
int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 };
Font crFont = null;
SizeF crSize = new SizeF();
for (int i = 0; i < 7; i++)
{
crFont = new Font("arial", sizes[i], FontStyle.Bold);
crSize = picture.MeasureString(_watermarkText, crFont);
if ((ushort)crSize.Width < (ushort)_width)
{
break;
}
}
float xpos = 0;
float ypos = 0;
switch (_watermarkPosition)
{
case WaterPos.WM_TOP_LEFT:
xpos = ((float)_width * (float).01) + (crSize.Width / 2);
ypos = (float)_height * (float).01;
break;
case WaterPos.WM_TOP_RIGHT:
xpos = ((float)_width * (float).99) - (crSize.Width / 2);
ypos = (float)_height * (float).01;
break;
case WaterPos.WM_BOTTOM_RIGHT:
xpos = ((float)_width * (float).99) - (crSize.Width / 2);
ypos = ((float)_height * (float).99) - crSize.Height;
break;
case WaterPos.WM_BOTTOM_LEFT:
xpos = ((float)_width * (float).01) + (crSize.Width / 2);
ypos = ((float)_height * (float).99) - crSize.Height;
break;
}
StringFormat StrFormat = new StringFormat();
StrFormat.Alignment = StringAlignment.Center;
SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));
picture.DrawString(_watermarkText, crFont, semiTransBrush2, xpos + 1, ypos + 1, StrFormat);
SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));
picture.DrawString(_watermarkText, crFont, semiTransBrush, xpos, ypos, StrFormat);
semiTransBrush2.Dispose();
semiTransBrush.Dispose();
}
/// <summary>
/// 添加图片水印
/// </summary>
/// <param name="oldpath">原图片绝对地址</param>
/// <param name="newpath">新图片放置的绝对地址</param>
/// <param name="WatermarkText">水印文字</param>
/// <param name="Watermarkimgpath">水印图片绝对地址</param>
public bool addWaterMark(string oldpath, string newpath, DealType dealtype, WaterPos WatermarkPosition, string WatermarkText, string Watermarkimgpath)
{
bool re = false;
try
{
System.Drawing.Image image = System.Drawing.Image.FromFile(oldpath);
foreach (Guid guid in image.FrameDimensionsList)//判断是否是GIF动画：是－则不加水印
{
FrameDimension dimension = new FrameDimension(guid);
if (image.GetFrameCount(dimension) > 1)
{
image.Dispose();
return(false);
}
}
Bitmap b = new Bitmap(image.Width, image.Height, PixelFormat.Format24bppRgb);
Graphics g = Graphics.FromImage(b);
g.Clear(Color.White);
g.SmoothingMode = SmoothingMode.AntiAlias;
g.InterpolationMode = InterpolationMode.High;
g.DrawImage(image, 0, 0, image.Width, image.Height);
switch (dealtype)
{
//是图片的话
case DealType.WM_IMAGE:
this.addWatermarkImage(g, Watermarkimgpath, WatermarkPosition, image.Width, image.Height);
break;
//如果是文字
case DealType.WM_TEXT:
this.addWatermarkText(g, WatermarkText, WatermarkPosition, image.Width, image.Height);
break;
}
//b.Save(newpath);
//直接save加水印后图片容量大小会成几倍增加
EncoderParameters parameters = new EncoderParameters(1);
parameters.Param[0] = new EncoderParameter(Encoder.Quality, ((long)80));
b.Save(newpath, ImageHelper.GetCodecInfo("image/" + ImageHelper.GetFormat(newpath).ToString().ToLower()), parameters);
b.Dispose();
g.Dispose();
image.Dispose();
re = true;
}
catch
{
re = false;
}
return(re);
}
///<summary>
/// 加水印图片
/// </summary>
/// <param name="picture">imge 对象</param>
/// <param name="WaterMarkPicPath">水印图片的地址</param>
/// <param name="_watermarkPosition">水印位置</param>
/// <param name="_width">被加水印图片的宽</param>
/// <param name="_height">被加水印图片的高</param>
private void addWatermarkImage(Graphics picture, string WaterMarkPicPath, WaterPos _watermarkPosition, int _width, int _height)
{
Image watermark = new Bitmap(WaterMarkPicPath);
ImageAttributes imageAttributes = new ImageAttributes();
ColorMap colorMap = new ColorMap();
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = { colorMap };
imageAttributes.SetRemapTable(remapTable, 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, 0.3f, 0.0f },
new float[] { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f }
};
ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
int xpos = 0;
int ypos = 0;
int WatermarkWidth = 0;
int WatermarkHeight = 0;
double bl = 1d;
//计算水印图片的比率
//取背景的1/4宽度来比较
if ((_width > watermark.Width * 4) && (_height > watermark.Height * 4))
{
bl = 1;
}
else if ((_width > watermark.Width * 4) && (_height < watermark.Height * 4))
{
bl = Convert.ToDouble(_height / 4) / Convert.ToDouble(watermark.Height);
}
else
if ((_width < watermark.Width * 4) && (_height > watermark.Height * 4))
{
bl = Convert.ToDouble(_width / 4) / Convert.ToDouble(watermark.Width);
}
else
{
if ((_width * watermark.Height) > (_height * watermark.Width))
{
bl = Convert.ToDouble(_height / 4) / Convert.ToDouble(watermark.Height);
}
else
{
bl = Convert.ToDouble(_width / 4) / Convert.ToDouble(watermark.Width);
}
}
WatermarkWidth = Convert.ToInt32(watermark.Width * bl);
WatermarkHeight = Convert.ToInt32(watermark.Height * bl);
switch (_watermarkPosition)
{
case WaterPos.WM_TOP_LEFT:
xpos = 10;
ypos = 10;
break;
case WaterPos.WM_TOP_RIGHT:
xpos = _width - WatermarkWidth - 10;
ypos = 10;
break;
case WaterPos.WM_BOTTOM_RIGHT:
xpos = _width - WatermarkWidth - 10;
ypos = _height - WatermarkHeight - 10;
break;
case WaterPos.WM_BOTTOM_LEFT:
xpos = 10;
ypos = _height - WatermarkHeight - 10;
break;
}
picture.DrawImage(watermark, new Rectangle(xpos, ypos, WatermarkWidth, WatermarkHeight), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes);
watermark.Dispose();
imageAttributes.Dispose();
}