/// <summary>
/// 开始绘制文字水印
/// </summary>
/// <example>
/// <code>
/// Watermark wm = new Watermark();
/// wm.ModifyImagePath=path;
/// wm.OutPath=Server.MapPath("") + "/upfile/" + fileName + "_new" + extension;
/// wm.DrawText("测试", 1, 100);
/// </code>
/// </example>
/// <param name="watermarkText">文字</param>
/// <param name="watermarkStatus">1-9</param>
/// <param name="quality">质量</param>
/// <param name="fontname">字体</param>
/// <param name="fontsize">大小</param>
public void DrawText(string watermarkText, int watermarkStatus, int quality, string fontname = "宋体", int fontsize = 12)
{
if (!FileDirectory.FileExists(this.ModifyImagePath))
{
return;
}
Image img = Image.FromFile(this.ModifyImagePath);
string filename = this.OutPath.IsNullEmpty() ? this.ModifyImagePath : this.OutPath;
Graphics g = Graphics.FromImage(img);
Font drawFont = new Font(fontname, fontsize, FontStyle.Regular, GraphicsUnit.Pixel);
SizeF crSize;
crSize = g.MeasureString(watermarkText, drawFont);
float xpos = 0;
float ypos = 0;
switch (watermarkStatus)
{
case 1:
xpos = (float)img.Width * (float).01;
ypos = (float)img.Height * (float).01;
break;
case 2:
xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);
ypos = (float)img.Height * (float).01;
break;
case 3:
xpos = ((float)img.Width * (float).99) - crSize.Width;
ypos = (float)img.Height * (float).01;
break;
case 4:
xpos = (float)img.Width * (float).01;
ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);
break;
case 5:
xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);
ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);
break;
case 6:
xpos = ((float)img.Width * (float).99) - crSize.Width;
ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);
break;
case 7:
xpos = (float)img.Width * (float).01;
ypos = ((float)img.Height * (float).99) - crSize.Height;
break;
case 8:
xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);
ypos = ((float)img.Height * (float).99) - crSize.Height;
break;
case 9:
xpos = ((float)img.Width * (float).99) - crSize.Width;
ypos = ((float)img.Height * (float).99) - crSize.Height;
break;
}
g.DrawString(watermarkText, drawFont, new SolidBrush(Color.White), xpos + 1, ypos + 1);
g.DrawString(watermarkText, drawFont, new SolidBrush(Color.Black), xpos, ypos);
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
ImageCodecInfo ici = null;
foreach (ImageCodecInfo codec in codecs)
{
if (codec.MimeType.IndexOf("jpeg") > -1)
{
ici = codec;
}
}
EncoderParameters encoderParams = new EncoderParameters();
long[] qualityParam = new long[1];
if (quality < 0 || quality > 100)
{
quality = 80;
}
qualityParam[0] = quality;
EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityParam);
encoderParams.Param[0] = encoderParam;
if (FileDirectory.FileExists(this.ModifyImagePath))
{
FileDirectory.FileDelete(this.ModifyImagePath);
}
if (ici.IsNotNull())
{
img.Save(filename, ici, encoderParams);
}
else
{
img.Save(filename);
}
g.Dispose();
img.Dispose();
}
/// <summary>
/// 按宽X长比例切图
/// </summary>
/// <param name="imagePath">源图地址</param>
/// <param name="savePath">新图地址</param>
/// <param name="cutWidth">宽度</param>
/// <param name="cutHeight">高度</param>
/// <param name="error">出错时执行</param>
/// <returns>成功true失败false</returns>
public static bool CutImageCustom(string imagePath, string savePath, int cutWidth, int cutHeight, Action <Exception> error = null)
{
try {
System.Drawing.Image objImage = System.Drawing.Image.FromFile(imagePath);
float x = objImage.Width;
float y = objImage.Height;
float xPercent = x / cutWidth;
float yPercent = y / cutHeight;
int width = 0, height = 0;
if (xPercent < yPercent)
{
width = (int)((x * cutHeight) / y);
height = cutHeight;
}
else
{
width = cutWidth;
height = (int)((cutWidth * y) / x);
}
Bitmap newimage = new Bitmap(width, height, PixelFormat.Format32bppRgb);
newimage.SetResolution(72f, 72f);
Graphics gdiobj = Graphics.FromImage(newimage);
gdiobj.CompositingQuality = CompositingQuality.HighQuality;
gdiobj.SmoothingMode = SmoothingMode.HighQuality;
gdiobj.InterpolationMode = InterpolationMode.HighQualityBicubic;
#if !MONO40
gdiobj.PixelOffsetMode = PixelOffsetMode.HighQuality;
#endif
gdiobj.FillRectangle(new SolidBrush(Color.White), 0, 0, width, height);
Rectangle destrect = new Rectangle(0, 0, width, height);
gdiobj.DrawImage(objImage, destrect, 0, 0, objImage.Width, objImage.Height, GraphicsUnit.Pixel);
gdiobj.Dispose();
System.Drawing.Imaging.EncoderParameters ep = new System.Drawing.Imaging.EncoderParameters(1);
ep.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)100);
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
ImageCodecInfo ici = null;
foreach (ImageCodecInfo codec in codecs)
{
if (codec.MimeType == "image/jpeg")
{
ici = codec;
}
}
if (ici.IsNotNull())
{
newimage.Save(savePath, ici, ep);
}
else
{
newimage.Save(savePath, objImage.RawFormat);
}
objImage.Dispose();
newimage.Dispose();
FileStream fs = new FileStream(savePath, FileMode.Open, FileAccess.Read);
fs.Close();
return(true);
} catch (Exception ex) {
if (error.IsNotNull())
{
error(ex);
}
return(false);
}
}