/// <summary>
/// 获取一个图片按等比例缩小后的大小。
/// </summary>
/// <param name="maxWidth">需要缩小到的宽度</param>
/// <param name="maxHeight">需要缩小到的高度</param>
/// <param name="imageOriginalWidth">图片的原始宽度</param>
/// <param name="imageOriginalHeight">图片的原始高度</param>
/// <returns>返回图片按等比例缩小后的实际大小</returns>
publicstaticSize GetNewSize(intmaxWidth, intmaxHeight, intimageOriginalWidth, intimageOriginalHeight)
{
doublew = 0.0;
doubleh = 0.0;
doublesw = Convert.ToDouble(imageOriginalWidth);
doublesh = Convert.ToDouble(imageOriginalHeight);
doublemw = Convert.ToDouble(maxWidth);
doublemh = Convert.ToDouble(maxHeight);
if(sw < mw && sh < mh)
{
w = sw;
h = sh;
}
elseif((sw / sh) > (mw / mh))
{
w = maxWidth;
h = (w * sh) / sw;
}
else
{
h = maxHeight;
w = (h * sw) / sh;
}
returnnewSize(Convert.ToInt32(w), Convert.ToInt32(h));
}
/// <summary>
/// 对给定的一个图片(Image对象)生成一个指定大小的缩略图。
/// </summary>
/// <param name="originalImage">原始图片</param>
/// <param name="thumMaxWidth">缩略图的宽度</param>
/// <param name="thumMaxHeight">缩略图的高度</param>
/// <returns>返回缩略图的Image对象</returns>
publicstaticSystem.Drawing.Image GetThumbNailImage(System.Drawing.Image originalImage, intthumMaxWidth, intthumMaxHeight)
{
Size thumRealSize = Size.Empty;
System.Drawing.Image newImage = originalImage;
Graphics graphics = null;
try
{
thumRealSize = GetNewSize(thumMaxWidth, thumMaxHeight, originalImage.Width, originalImage.Height);
newImage = newBitmap(thumRealSize.Width, thumRealSize.Height);
graphics = Graphics.FromImage(newImage);
graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.Clear(Color.Transparent);
graphics.DrawImage(originalImage, newRectangle(0, 0, thumRealSize.Width, thumRealSize.Height), newRectangle(0, 0, originalImage.Width, originalImage.Height), GraphicsUnit.Pixel);
}
catch{ }
finally
{
if(graphics != null)
{
graphics.Dispose();
graphics = null;
}
}
returnnewImage;
}
/// <summary>
/// 对给定的一个图片文件生成一个指定大小的缩略图。
/// </summary>
/// <param name="originalImage">图片的物理文件地址</param>
/// <param name="thumMaxWidth">缩略图的宽度</param>
/// <param name="thumMaxHeight">缩略图的高度</param>
/// <returns>返回缩略图的Image对象</returns>
publicstaticSystem.Drawing.Image GetThumbNailImage(stringimageFile, intthumMaxWidth, intthumMaxHeight)
{
System.Drawing.Image originalImage = null;
System.Drawing.Image newImage = null;
try
{
originalImage = System.Drawing.Image.FromFile(imageFile);
newImage = GetThumbNailImage(originalImage, thumMaxWidth, thumMaxHeight);
}
catch{ }
finally
{
if(originalImage != null)
{
originalImage.Dispose();
originalImage = null;
}
}
returnnewImage;
}
/// <summary>
/// 对给定的一个图片文件生成一个指定大小的缩略图,并将缩略图保存到指定位置。
/// </summary>
/// <param name="originalImageFile">图片的物理文件地址</param>
/// <param name="thumbNailImageFile">缩略图的物理文件地址</param>
/// <param name="thumMaxWidth">缩略图的宽度</param>
/// <param name="thumMaxHeight">缩略图的高度</param>
publicstaticvoidMakeThumbNail(stringoriginalImageFile, stringthumbNailImageFile, intthumMaxWidth, intthumMaxHeight)
{
System.Drawing.Image newImage = GetThumbNailImage(originalImageFile, thumMaxWidth, thumMaxHeight);
try
{
newImage.Save(thumbNailImageFile, ImageFormat.Jpeg);
}
catch
{ }
finally
{
newImage.Dispose();
newImage = null;
}
}
/// <summary>
/// 将一个图片的内存流调整为指定大小,并返回调整后的内存流。
/// </summary>
/// <param name="originalImageStream">原始图片的内存流</param>
/// <param name="newWidth">新图片的宽度</param>
/// <param name="newHeight">新图片的高度</param>
/// <returns>返回调整后的图片的内存流</returns>
publicstaticMemoryStream ResizeImage(Stream originalImageStream, intnewWidth, intnewHeight)
{
MemoryStream newImageStream = null;
System.Drawing.Image newImage = Globals.GetThumbNailImage(System.Drawing.Image.FromStream(originalImageStream), newWidth, newHeight);
if(newImage != null)
{
newImageStream = newMemoryStream();
newImage.Save(newImageStream, ImageFormat.Jpeg);
}
returnnewImageStream;
}
/// <summary>
/// 将一个内存流保存为磁盘文件。
/// </summary>
/// <param name="stream">内存流</param>
/// <param name="newFile">目标磁盘文件地址</param>
publicstaticvoidSaveStreamToFile(Stream stream, stringnewFile)
{
if(stream == null|| stream.Length == 0 || string.IsNullOrEmpty(newFile))
{
return;
}
byte[] buffer = newbyte[stream.Length];
stream.Position = 0;
stream.Read(buffer, 0, buffer.Length);
FileStream fileStream = newFileStream(newFile, FileMode.OpenOrCreate, FileAccess.Write);
fileStream.Write(buffer, 0, buffer.Length);
fileStream.Flush();
fileStream.Close();
fileStream.Dispose();
}
/// <summary>
/// 对一个指定的图片加上图片水印效果。
/// </summary>
/// <param name="imageFile">图片文件地址</param>
/// <param name="waterImage">水印图片(Image对象)</param>
publicstaticvoidCreateImageWaterMark(stringimageFile, System.Drawing.Image waterImage)
{
if(string.IsNullOrEmpty(imageFile) || !File.Exists(imageFile) || waterImage == null)
{
return;
}
System.Drawing.Image originalImage = System.Drawing.Image.FromFile(imageFile);
if(originalImage.Width - 10 < waterImage.Width || originalImage.Height - 10 < waterImage.Height)
{
return;
}
Graphics graphics = Graphics.FromImage(originalImage);
intx = originalImage.Width - waterImage.Width - 10;
inty = originalImage.Height - waterImage.Height - 10;
intwidth = waterImage.Width;
intheight = waterImage.Height;
graphics.DrawImage(waterImage, newRectangle(x, y, width, height), 0, 0, width, height, GraphicsUnit.Pixel);
graphics.Dispose();
MemoryStream stream = newMemoryStream();
originalImage.Save(stream, ImageFormat.Jpeg);
originalImage.Dispose();
System.Drawing.Image imageWithWater = System.Drawing.Image.FromStream(stream);
imageWithWater.Save(imageFile);
imageWithWater.Dispose();
}
/// <summary>
/// 对一个指定的图片加上文字水印效果。
/// </summary>
/// <param name="imageFile">图片文件地址</param>
/// <param name="waterText">水印文字内容</param>
publicstaticvoidCreateTextWaterMark(stringimageFile, stringwaterText)
{
if(string.IsNullOrEmpty(imageFile) || string.IsNullOrEmpty(waterText) || !File.Exists(imageFile))
{
return;
}
System.Drawing.Image originalImage = System.Drawing.Image.FromFile(imageFile);
Graphics graphics = Graphics.FromImage(originalImage);
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.TextRenderingHint = TextRenderingHint.ClearTypeGridFit;
graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
SolidBrush brush = newSolidBrush(Color.FromArgb(153, 255, 255, 255));
Font waterTextFont = newFont("Arial", 16, FontStyle.Regular);
SizeF waterTextSize = graphics.MeasureString(waterText, waterTextFont);
floatx = (float)originalImage.Width - waterTextSize.Width - 10F;
floaty = (float)originalImage.Height - waterTextSize.Height - 10F;
graphics.DrawString(waterText, waterTextFont, brush, x, y);
graphics.Dispose();
brush.Dispose();
MemoryStream stream = newMemoryStream();
originalImage.Save(stream, ImageFormat.Jpeg);
originalImage.Dispose();
System.Drawing.Image imageWithWater = System.Drawing.Image.FromStream(stream);
imageWithWater.Save(imageFile);
imageWithWater.Dispose();
}
/// <summary>
/// 判断上传组件是否包含内容。
/// </summary>
/// <param name="fileUpload">ASP.NET 2.0标准上传组件</param>
/// <returns>如果数据有效,则返回True,否则返回False</returns>
publicstaticboolIsAttachmentValid(FileUpload fileUpload)
{
if(fileUpload != null&&
fileUpload.PostedFile != null&&
!string.IsNullOrEmpty(fileUpload.PostedFile.FileName) &&
fileUpload.PostedFile.ContentLength > 0)
{
returntrue;
}
returnfalse;
}